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Sample records for alpha subunit gene

  1. Mapping of a liver phosphorylase kinase [alpha]-subunit gene on the mouse x chromosome

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    Geng, Yan; Derry, J.M.J.; Barnard, P.J. (MRC Molecular Neurobiology Unit, Cambridge (United Kingdom)); Hendrickx, J.; Coucke, P.; Willems, P.R. (Univ. of Antwerp (Belgium))

    1993-01-01

    Phosphorylase kinase (PHK) is a regulatory enzyme of the glycogenolytic pathway composed of a complex of four subunits. We recently mapped the muscle [alpha]-subunit gene (Phka) to the mouse X chromosome in a region syntenic with the proximal long arm of the human X chromosome and containing the human homologue of this gene, PHKA. We now report the mapping of the liver [alpha]-subunit gene to the telomeric end of the mouse X chromosome. This mapping position would suggest a location for the human liver [alpha]-subunit gene on the proximal short arm of the X chromosome, a region recently implicated in X-linked liver glycogenosis (XLG). 20 refs., 2 figs.

  2. Differential expression of G protein alpha and ß subunit genes during development of Phytophthora infestans

    NARCIS (Netherlands)

    Laxalt, A.M.; Latijnhouwers, M.; Hulten, van M.; Govers, F.

    2002-01-01

    A G protein subunit gene (pigpa1) and a G protein subunit gene (pigpb1) were isolated from the oomycete Phytophthora infestans, the causal agent of potato late blight. Heterotrimeric G proteins are evolutionary conserved GTP-binding proteins that are composed of ,, and subunits and participate in di

  3. Structural organization, sequence, and expression of the mouse HEXA gene encoding the alpha subunit of hexosaminidase A.

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    Wakamatsu, N; Benoit, G; Lamhonwah, A M; Zhang, Z X; Trasler, J M; Triggs-Raine, B L; Gravel, R A

    1994-11-01

    Genomic clones of the mouse HEXA gene encoding the alpha subunit of lysosomal beta-hexosaminidase A have been isolated, analyzed, and sequenced. The HEXA gene spans approximately 26 kb and consists of 14 exons and 13 introns. The 5' flanking region of the gene has three candidate GC boxes and a number of potential promoter and regulatory elements. Promoter analysis using deletion constructs of 5' flanking sequence fused to the bacterial chloramphenicol acetyltransferase (CAT) gene showed that 150 bp of 5' sequence was sufficient for expression in transfected monkey kidney COS cells. Determination of the sequence of the 5' end of the Hex alpha mRNA by an "anchor-ligation PCR" procedure showed that transcription is initiated from a cluster of sites centered -42, -32, and -21 bp from the first in-frame ATG. Northern blot analysis from 11 different tissues showed over five times the steady-state level of Hex alpha mRNA in testis as compared to that found in three different brain regions; the lowest level (about 1/3 of brain) was found in liver. Comparison of the 5' flanking sequence with that of the human HEXA gene revealed 78% identity within the first 100 bp. These data suggest that the mouse HEXA gene is controlled mainly by sequences located within 150 bp of the 5' flanking region, and we speculate that it may have a role, not only in brain and other tissues, but also in reproductive function in the adult male mouse.

  4. Nuclear factor YY1 activates the mammalian F0F1 ATP synthase alpha-subunit gene.

    Science.gov (United States)

    Breen, G A; Vander Zee, C A; Jordan, E M

    1996-01-01

    Analysis of the promoters of the bovine and human nuclear-encoded mitochondrial F0F1 ATP synthase alpha-subunit genes (ATPA) has identified several positive cis-acting regulatory regions that are important for basal promoter activity in human HeLa cells. We have previously determined that the binding of a protein factor, termed ATPF1, to an E-box sequence (CANNTG) located within one of these cis-acting regions is critical for transcriptional activation of the ATPA gene. In this article, we describe a second positive cis-acting regulatory element of the ATPA gene that is important for expression of the ATPA gene. We show that this cis-acting element also contains a binding site for a protein present in HeLa cells. On the basis of electrophoretic mobility shift patterns, oligonucleotide competition assays, and immunological cross-reactivity, we conclude that this protein factor is Yin-Yang 1 (YY1). Experiments carried out to examine the functional role of YY1 within the context of the ATPA promoter demonstrated that YY1 acts as a positive regulator of the ATPA gene. For example, when the YY1 binding site of the ATPA promoter was placed upstream of a reporter gene it was found to activate transcription in transient transfection assays. In addition, disruption of the YY1 binding site in the ATPA gene resulted in a loss of transcriptional activity. Furthermore, in cotransfection experiments overexpression of YY1 in trans was found to activate transcription of ATPA promoter-CAT constructs. Thus, at least two positive trans-acting regulatory factors, ATPF1 and YY1, are important for expression of the bovine and human F0F1 ATP synthase alpha-subunit genes.

  5. Cloning and characterization of genes encoding alpha and beta subunits of glutamate-gated chloride channel protein in Cylicocyclus nassatus.

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    Tandon, Ritesh; LePage, Keith T; Kaplan, Ray M

    2006-11-01

    The invertebrate glutamate-gated chloride channels (GluCls) are receptor molecules and targets for the avermectin-milbemycin (AM) group of anthelmintics. Mutations in GluCls are associated with ivermectin resistance in the soil dwelling nematode Caenorhabditis elegans and the parasitic nematode Cooperia oncophora. In this study, full-length cDNAs encoding alpha and beta subunits of GluCl were cloned and sequenced in Cylicocyclus nassatus, a common and important cyathostomin nematode parasite of horses. Both genes possess the sequence characteristics typical of GluCls, and phylogenetic analysis confirms that these genes are evolutionarily closely related to GluCls of other nematodes and flies. Complete coding sequences of C. nassatus GluCl-alpha and GluCl-beta were subcloned into pTL1 mammalian expression vector, and proteins were expressed in COS-7 cells. Ivermectin-binding characteristics were determined by incubating COS-7 cell membranes expressing C. nassatus GluCl-alpha and GluCl-beta proteins with [(3)H]ivermectin. In competitive binding experiments, fitting the data to a one site competition model, C. nassatus GluCl-alpha was found to bind [(3)H]ivermectin with a high amount of displaceable binding (IC(50)=208 pM). Compared to the mock-transfected COS-7 cells, the means of [(3)H]ivermectin binding were significantly different for C. nassatus GluCl-alpha and the Haemonchus contortus GluCl (HcGluCla) (p=0.018 and 0.023, respectively) but not for C. nassatus GluCl-beta (p=0.370). This is the first report of orthologs of GluCl genes and in vitro expression of an ivermectin-binding protein in a cyathostomin species. These data suggest the likelihood of a similar mechanism of action of AM drugs in these parasites, and suggest that mechanisms of resistance may also be similar.

  6. Hyperkalemic periodic paralysis caused by recurring mutation in the adult muscle sodium channel alpha-subunit gene.

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    Sillén, A; Wadelius, C; Sundvall, M; Ahlsten, G; Gustavson, K H

    1996-01-01

    Linkage studies and mutation analysis were performed in two Swedish families with hyperkalemic periodic paralysis (HYPP), an autosomal dominant inherited disorder characterized by episodic muscle weakness associated with increasing or high levels of serum potassium. The gene for HYPP is the gene encoding the alpha-subunit of the sodium channel of adult human skeletal muscle (SCN4A). SCN4A has been localized on chromosome 17 q closely linked to the human growth hormone gene. Linkage between a microsatellite polymorphism in the SCN4A gene and the disease was shown in two Swedish families (Z = 12.10 theta = 0). Sequence analysis revealed that the two Swedish families have got a C to T transition at position 2188 in the cDNA. At the protein level this Thr 704 to Met mutation is located in the fifth membrane spanning segment of domain II of the protein, as previously described (28). The mutation was linked to different microsatellite alleles regarding both a (GT)n and a (GA)n repeat in the gene. Either the families are related and new mutations have occurred in both microsatellites when the pedigrees were separated or the mutation has arisen independently in the two families analysed. From the mutant alleles characterized so far it seems as if a limited number of mutations is present in this gene.

  7. Comparative Analysis of Eubacterial DNA Polymerase Ⅲ Alpha Subunits

    Institute of Scientific and Technical Information of China (English)

    Xiao-Qian Zhao; Jian-Fei Hu; Jun Yu

    2006-01-01

    DNA polymerase Ⅲ is one of the five eubacterial DNA polymerases that is responsible for the replication of DNA duplex. Among the ten subunits of the DNA polymerase Ⅲ core enzyme, the alpha subunit catalyzes the reaction for polymerizing both DNA strands. In this study, we extracted genomic sequences of the alpha subunit from 159 sequenced eubacterial genomes, and carried out sequencebased phylogenetic and structural analyses. We found that all eubacterial genomes have one or more alpha subunits, which form either homodimers or heterodimers.Phylogenetic and domain structural analyses as well as copy number variations of the alpha subunit in each bacterium indicate the classification of alpha subunit into four basic groups: polC, dnaE1, dnaE2, and dnaE3. This classification is of essence in genome composition analysis. We also consolidated the naming convention to avoid further confusion in gene annotations.

  8. Mapping of the {alpha}{sub 4} subunit gene (GABRA4) to human chromosome 4 defines an {alpha}{sub 2}-{alpha}{sub 4}-{beta}{sub 1}-{gamma}{sub 1} gene cluster: Further evidence that modern GABA{sub a} receptor gene clusters are derived from an ancestral cluster

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    McLean, P.J.; Farb, D.H.; Russek, S.J. [Boston Univ. School of Medicine, MA (United States)] [and others

    1995-04-10

    We demonstrated previously that an {alpha}{sub 1}-{beta}{sub 2}-{gamma}{sub 2} gene cluster of the {gamma}-aminobutyric acid (GABA{sub A}) receptor is located on human chromosome 5q34-q35 and that an ancestral {alpha}-{beta}-{gamma} gene cluster probably spawned clusters on chromosomes 4, 5, and 15. Here, we report that the {alpha}{sub 4} gene (GABRA4) maps to human chromosome 4p14-q12, defining a cluster comprising the {alpha}{sub 2}, {alpha}{sub 4}, {beta}{sub 1}, and {gamma}{sub 1} genes. The existence of an {alpha}{sub 2}-{alpha}{sub 4}-{beta}{sub 1}-{gamma}{sub 2} cluster on chromosome 4 and an {alpha}{sub 1}-{alpha}{sub 6}-{beta}{sub 2}-{gamma}{sub 2} cluster on chromosome 5 provides further evidence that the number of ancestral GABA{sub A} receptor subunit genes has been expanded by duplication within an ancestral gene cluster. Moreover, if duplication of the {alpha} gene occurred before duplication of the ancestral gene cluster, then a heretofore undiscovered subtype of a subunit should be located on human chromosome 15q11-q13 within an {alpha}{sub 5}-{alpha}{sub x}-{beta}{sub 3}-{gamma}{sub 3} gene cluster at the locus for Angelman and Prader-Willi syndromes. 34 refs., 6 figs., 1 tab.

  9. Two novel functional mutations in the Na+,K+-ATPase alpha2-subunit ATP1A2 gene in patients with familial hemiplegic migraine and associated neurological phenotypes.

    NARCIS (Netherlands)

    Castro, M.J.; Nunes, B.; Vries, B. de; Lemos, C.; Molkot, K.R. van; Heuvel, J.J.M.W. van den; Temudo, T.; Barros, J.; Sequeiros, J.; Frants, R.R.; Koenderink, J.B.; Pereira-Monteiro, J.M.; Maagdenberg, A.M. van den

    2008-01-01

    Mutations in the ATP1A2 gene, encoding the alpha2-subunit of the Na+,K+-ATPase, are associated with familial hemiplegic migraine type 2. The majority of ATP1A2 mutations were reported in patients with hemiplegic migraine without any additional neurological findings. Here, we report on two novel ATP1

  10. Molecular evolution and nucleotide sequences of the maize plastid genes for the alpha subunit of CF1 (atpA) and the proteolipid subunit of CF0 (atpH).

    Science.gov (United States)

    Rodermel, S R; Bogorad, L

    1987-05-01

    The nucleotide sequences of the maize plastid genes for the alpha subunit of CF1 (atpA) and the proteolipid subunit of CF0 (atpH) are presented. The evolution of these genes among higher plants is characterized by a transition mutation bias of about 2:1 and by rates of synonymous and nonsynonymous substitution which are much lower than similar rates for genes from other sources. This is consistent with the notion that the plastid genome is evolving conservatively in primary sequence. Yet, the mode and tempo of sequence evolution of these and other plastid-encoded coupling factor genes are not the same. In particular, higher rates of nonsynonymous substitution in atpE (the gene for the epsilon subunit of CF1) and higher rates of synonymous substitution in atpH in the dicot vs. monocot lineages of higher plants indicate that these sequences are likely subject to different evolutionary constraints in these two lineages. The 5'- and 3'-transcribed flanking regions of atpA and atpH from maize, wheat and tobacco are conserved in size, but contain few putative regulatory elements which are conserved either in their spatial arrangement or sequence complexity. However, these regions likely contain variable numbers of "species-specific" regulatory elements. The present studies thus suggest that the plastid genome is not a passive participant in an evolutionary process governed by a more rapidly changing, readily adaptive, nuclear compartment, but that novel strategies for the coordinate expression of genes in the plastid genome may arise through rapid evolution of the flanking sequences of these genes.

  11. Association of Common Polymorphisms in the Nicotinic Acetylcholine Receptor Alpha4 Subunit Gene with an Electrophysiological Endophenotype in a Large Population-Based Sample.

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    A Mobascher

    Full Text Available Variation in genes coding for nicotinic acetylcholine receptor (nAChR subunits affect cognitive processes and may contribute to the genetic architecture of neuropsychiatric disorders. Single nucleotide polymorphisms (SNPs in the CHRNA4 gene that codes for the alpha4 subunit of alpha4/beta2-containing receptors have previously been implicated in aspects of (mostly visual attention and smoking-related behavioral measures. Here we investigated the effects of six synonymous but functional CHRNA4 exon 5 SNPs on the N100 event-related potential (ERP, an electrophysiological endophenotype elicited by a standard auditory oddball. A total of N = 1,705 subjects randomly selected from the general population were studied with electroencephalography (EEG as part of the German Multicenter Study on nicotine addiction. Two of the six variants, rs1044396 and neighboring rs1044397, were significantly associated with N100 amplitude. This effect was pronounced in females where we also observed an effect on reaction time. Sequencing of the complete exon 5 region in the population sample excluded the existence of additional/functional variants that may be responsible for the observed effects. This is the first large-scale population-based study investigation the effects of CHRNA4 SNPs on brain activity measures related to stimulus processing and attention. Our results provide further evidence that common synonymous CHRNA4 exon 5 SNPs affect cognitive processes and suggest that they also play a role in the auditory system. As N100 amplitude reduction is considered a schizophrenia-related endophenotype the SNPs studied here may also be associated with schizophrenia outcome measures.

  12. INCURVATA2 encodes the catalytic subunit of DNA Polymerase alpha and interacts with genes involved in chromatin-mediated cellular memory in Arabidopsis thaliana.

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    Barrero, José María; González-Bayón, Rebeca; del Pozo, Juan Carlos; Ponce, María Rosa; Micol, José Luis

    2007-09-01

    Cell type-specific gene expression patterns are maintained by the stable inheritance of transcriptional states through mitosis, requiring the action of multiprotein complexes that remodel chromatin structure. Genetic and molecular interactions between chromatin remodeling factors and components of the DNA replication machinery have been identified in Schizosaccharomyces pombe, indicating that some epigenetic marks are replicated simultaneously to DNA with the participation of the DNA replication complexes. This model of epigenetic inheritance might be extended to the plant kingdom, as we report here with the positional cloning and characterization of INCURVATA2 (ICU2), which encodes the putative catalytic subunit of the DNA polymerase alpha of Arabidopsis thaliana. The strong icu2-2 and icu2-3 insertional alleles caused fully penetrant zygotic lethality when homozygous and incompletely penetrant gametophytic lethality, probably because of loss of DNA polymerase activity. The weak icu2-1 allele carried a point mutation and caused early flowering, leaf incurvature, and homeotic transformations of sepals into carpels and of petals into stamens. Further genetic analyses indicated that ICU2 interacts with TERMINAL FLOWER2, the ortholog of HETEROCHROMATIN PROTEIN1 of animals and yeasts, and with the Polycomb group (PcG) gene CURLY LEAF. Another PcG gene, EMBRYONIC FLOWER2, was found to be epistatic to ICU2. Quantitative RT-PCR analyses indicated that a number of regulatory genes were derepressed in the icu2-1 mutant, including genes associated with flowering time, floral meristem, and floral organ identity.

  13. An intact F1ATPase alpha-subunit gene and a pseudogene with differing genomic organization are detected in both male-fertile and CMS petunia mitochondria.

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    Yesodi, V; Hauschner, H; Tabib, Y; Firon, N

    1997-11-01

    The gene copies for the alpha-subunit of the mitochondrial F1ATPase (atpA) were isolated and characterized in both male-fertile and cytoplasmic male sterile (CMS) petunia. Two copies, an intact gene and a truncated gene, were detected in both cytoplasms. The accumulated data, based upon a comparison of the sequences (the open reading frames as well as the 5' and 3' flanking regions) of the two atpA copies, both in male-fertile and CMS Petunia, indicate that: (1) they differ in their genomic organization and (2) a common progenitor cytoplasm, containing two copies of an intact atpA sequence, served as the origin for the atpA copies of the fertility and CMS-inducing cytoplasms. Homologous recombination through the progenitor intact atpA sequences is assumed to have caused the rearrangement in the 3' portion of the atpA open reading frame and the generation of the truncated atpA gene. It is thus suggested that the atpA pseudogenes, in both male-fertile and CMS cytoplasms, originated from a common progenitor atpA pseudogene sequence.

  14. Regulation of the nuclear gene that encodes the alpha-subunit of the mitochondrial F0F1-ATP synthase complex. Activation by upstream stimulatory factor 2.

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    Breen, G A; Jordan, E M

    1997-04-18

    We have previously identified several positive cis-acting regulatory regions in the promoters of the bovine and human nuclear-encoded mitochondrial F0F1-ATP synthase alpha-subunit genes (ATPA). One of these cis-acting regions contains the sequence 5'-CACGTG-3' (an E-box), to which a number of transcription factors containing a basic helix-loop-helix motif can bind. This E-box element is required for maximum activity of the ATPA promoter in HeLa cells. The present study identifies the human transcription factor, upstream stimulatory factor 2 (USF2), as a nuclear factor that binds to the ATPA E-box and demonstrates that USF2 plays a critical role in the activation of the ATPA gene in vivo. Evidence includes the following. Antiserum directed against USF2 recognized factors present in HeLa nuclear extracts that interact with the ATPA promoter in mobility shift assays. Wild-type USF2 proteins synthesized from expression vectors trans-activated the ATPA promoter through the E-box, whereas truncated USF2 proteins devoid of the amino-terminal activation domains did not. Importantly, expression of a dominant-negative mutant of USF2 lacking the basic DNA binding domain but able to dimerize with endogenous USF proteins significantly reduced the level of activation of the ATPA promoter caused by ectopically coexpressed USF2, demonstrating the importance of endogenous USF2 in activation of the ATPA gene.

  15. Molecular Cloning, Structural Analysis and Tissue Expression of Protein Phosphatase 3 Catalytic Subunit Alpha Isoform (PPP3CA Gene in Tianfu Goat Muscle

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    Lu Wan

    2014-02-01

    Full Text Available Calcineurin, a Ca2+/calmodulin-dependent protein phosphatase, plays a critical role in controlling skeletal muscle fiber type. However, little information is available concerning the expression of calcineurin in goat. Therefore, protein phosphatase 3 catalytic subunit alpha isoform (PPP3CA gene, also called calcineurin Aα, was cloned and its expression characterized in Tianfu goat muscle. Real time quantitative polymerase chain reaction (RT-qPCR analyses revealed that Tianfu goat PPP3CA was detected in cardiac muscle, biceps femoris muscle, abdominal muscle, longissimus dors muscle, and soleus muscle. High expression levels were found in biceps femoris muscle, longissimus muscle and abdominal muscle (p < 0.01, and low expression levels were seen in cardiac muscle and soleus muscle (p > 0.05. In addition, the spatial-temporal mRNA expression levels showed different variation trends in different muscles with the age of the goats. Western blotting further revealed that PPP3CA protein was expressed in the above-mentioned tissues, with the highest level in biceps femoris muscle, and the lowest level in soleus muscle. In this study, we isolated the full-length coding sequence of Tianfu goat PPP3CA gene, analyzed its structure, and investigated its expression in different muscle tissues from different age stages. These results provide a foundation for understanding the function of the PPP3CA gene in goats.

  16. Molecular cloning, structural analysis and tissue expression of protein phosphatase 3 catalytic subunit alpha isoform (PPP3CA) gene in Tianfu goat muscle.

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    Wan, Lu; Ma, Jisi; Xu, Gangyi; Wang, Daihua; Wang, Nianlu

    2014-02-07

    Calcineurin, a Ca(2+)/calmodulin-dependent protein phosphatase, plays a critical role in controlling skeletal muscle fiber type. However, little information is available concerning the expression of calcineurin in goat. Therefore, protein phosphatase 3 catalytic subunit alpha isoform (PPP3CA) gene, also called calcineurin Aα, was cloned and its expression characterized in Tianfu goat muscle. Real time quantitative polymerase chain reaction (RT-qPCR) analyses revealed that Tianfu goat PPP3CA was detected in cardiac muscle, biceps femoris muscle, abdominal muscle, longissimus dors muscle, and soleus muscle. High expression levels were found in biceps femoris muscle, longissimus muscle and abdominal muscle (p muscle and soleus muscle (p > 0.05). In addition, the spatial-temporal mRNA expression levels showed different variation trends in different muscles with the age of the goats. Western blotting further revealed that PPP3CA protein was expressed in the above-mentioned tissues, with the highest level in biceps femoris muscle, and the lowest level in soleus muscle. In this study, we isolated the full-length coding sequence of Tianfu goat PPP3CA gene, analyzed its structure, and investigated its expression in different muscle tissues from different age stages. These results provide a foundation for understanding the function of the PPP3CA gene in goats.

  17. Association of polymorphisms in nicotinic acetylcholine receptor alpha 4 subunit gene (CHRNA4), mu-opioid receptor gene (OPRM1), and ethanol-metabolizing enzyme genes with alcoholism in Korean patients.

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    Kim, Soon Ae; Kim, Jong-Woo; Song, Ji-Young; Park, Sunny; Lee, Hee Jae; Chung, Joo-Ho

    2004-01-01

    Findings obtained from several studies indicate that ethanol enhances the activity of alpha4beta2 neuronal nicotinic acetylcholine receptor and support the possibility that a polymorphism of the nicotinic acetylcholine receptor alpha4 subunit gene (CHRNA4) modulates enhancement of nicotinic receptor function by ethanol. To identify the association between the CfoI polymorphism of the CHRNA4 and alcoholism, we examined distribution of genotypes and allele frequencies in Korean patients diagnosed with alcoholism (n = 127) and Korean control subjects without alcoholism (n = 185) with polymerase chain reaction-restriction fragment length polymorphism methods. We were able to detect the association between the CfoI polymorphism of the CHRNA4 and alcoholism in Korean patients (genotype P = .023; allele frequency P = .047). The genotypes and allele frequencies of known polymorphisms in other alcoholism candidate genes, such as alcohol metabolism-related genes [alcohol dehydrogenase 2 (ADH2), aldehyde dehydrogenase 2 (ALDH2), alcohol dehydrogenase 3 (ADH3), and cytochrome P450 2E1 (CYP2E1)] and mu-opioid receptor gene (OPRM1), were studied. The polymorphisms of ADH2, ALDH2, and CYP2E1 were significantly different in Korean patients with alcoholism and Korean control subjects without alcoholism, but ADH3 and OPRM1 did not differ between the two groups.

  18. A vacuolar-type proton (H+) translocating ATPase alpha subunit encoded by the Hc-vha-6 gene of Haemonchus contortus.

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    Hu, Min; He, Li; Campbell, Bronwyn E; Zhong, Weiwei; Sternberg, Paul W; Gasser, Robin B

    2010-08-01

    In the present study, a full-length cDNA (designated Hc-vha-6) inferred to encode an alpha subunit of a vacuolar-type proton translocating adenosine triphosphatase (V-ATPase) was isolated from the parasitic nematode Haemonchus contortus, and characterized. The transcript for Hc-vha-6 was detected in all developmental stages and both sexes of H. contortus. Elements, including two TATA box (TATAA), two inverted CAAT box (ATTGG), five E box (CANNTG) and six GATA as well as five inverse GATA (TTATC) transcription factor motifs, were identified in the non-coding region upstream of Hc-vha-6. The open reading frame (ORF) of 2601 nucleotides encoded a protein (Hc-VHA-6) of 866 amino acids and a molecular weight of approximately 98.7 kDa. Comparison with a published protein sequence for a homologue (VPH1P) from yeast showed that Hc-VHA-6 had nine transmembrane domains and the 14 essential amino acid residues associated with enzyme activity, assembly, intracellular and/or membrane targeting. Phylogenetic analyses of selected amino acid sequence data revealed Hc-VHA-6 to be most closely related to VHA-6 of Caenorhabditis elegans. A predictive network analysis inferred that vha-6 interacts with at least seven other genes encoding V-ATPase subunits and a small Rab GTPase. This study provides the first insight into a V-ATPase of parasitic nematodes and a sound basis for future functional genomic work. Copyright 2010 Elsevier Ltd. All rights reserved.

  19. Gene targeting of CK2 catalytic subunits.

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    Seldin, David C; Lou, David Y; Toselli, Paul; Landesman-Bollag, Esther; Dominguez, Isabel

    2008-09-01

    Protein kinase CK2 is a highly conserved and ubiquitous serine-threonine kinase. It is a tetrameric enzyme that is made up of two regulatory CK2beta subunits and two catalytic subunits, either CK2alpha/CK2alpha, CK2alpha/CK2alpha', or CK2alpha'/CK2alpha'. Although the two catalytic subunits diverge in their C termini, their enzymatic activities are similar. To identify the specific function of the two catalytic subunits in development, we have deleted them individually from the mouse genome by homologous recombination. We have previously reported that CK2alpha' is essential for male germ cell development, and we now demonstrate that CK2alpha has an essential role in embryogenesis, as mice lacking CK2alpha die in mid-embryogenesis, with cardiac and neural tube defects.

  20. Two novel functional mutations in the Na+,K+-ATPase alpha2-subunit ATP1A2 gene in patients with familial hemiplegic migraine and associated neurological phenotypes.

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    Castro, M-J; Nunes, B; de Vries, B; Lemos, C; Vanmolkot, K R J; van den Heuvel, J J M W; Temudo, T; Barros, J; Sequeiros, J; Frants, R R; Koenderink, J B; Pereira-Monteiro, J M; van den Maagdenberg, A M J M

    2008-01-01

    Mutations in the ATP1A2 gene, encoding the alpha2-subunit of the Na+,K+-ATPase, are associated with familial hemiplegic migraine type 2. The majority of ATP1A2 mutations were reported in patients with hemiplegic migraine without any additional neurological findings. Here, we report on two novel ATP1A2 mutations that were identified in two Portuguese probands with hemiplegic migraine and interesting additional clinical features. The proband's of family 1 (with a V362E mutation) had mood alterations, classified as a borderline personality. The proband in family 2 (with a P796S mutation) had mild mental impairment, in addition to hemiplegic migraine; more severe mental retardation was observed in his brother, who also had hemiplegic migraine and carried the same mutation. Cell-survival assays clearly showed abnormal functioning of mutant Na+,K+-ATPase, indicating that both ATP1A2 mutants are disease causing. Additionally, our results suggest a possible causal relationship of the ATP1A2 mutations with the complex clinical phenotypes observed in the probands.

  1. A new sodium channel alpha-subunit gene (Scn9a) from Schwann cells maps to the Scn1a, Scn2a, Scn3a cluster of mouse chromosome 2.

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    Beckers, M C; Ernst, E; Belcher, S; Howe, J; Levenson, R; Gros, P

    1996-08-15

    We have used a total of 27 AXB/BXA recombinant inbred mouse strains to determine the chromosomal location of a newly identified gene encoding an alpha-subunit isoform of the sodium channel from Schwann cells, Scn9a. Linkage analysis established that Scn9a mapped to the proximal segment of mouse chromosome 2. The segregation of restriction fragment length polymorphisms in 145 progeny from a Mus spretus x C57BL/6J backcross indicates that Scn9a is very tightly linked to Scn1a (gene encoding the type I sodium channel alpha-subunit of the brain) and forms part of a cluster of four Scna genes located on mouse chromosome 2.

  2. A new sodium channel {alpha}-subunit gene (Scn9a) from Schwann cells maps to the Scn1a, Scn2a, Scn3a cluster of mouse chromosome 2

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    Beckers, M.C.; Ernst, E.; Gros, P. [McGill Univ., Montreal (Canada)

    1996-08-15

    We have used a total of 27 AXB/BXA recombinant inbred mouse strains to determine the chromosomal location of a newly identified gene encoding an {alpha}-subunit isoform of the sodium channel from Schwann cells, Scn9a. Linkage analysis established that Scn9a mapped to the proximal segment of mouse chromosome 2. The segregation of restriction fragment length polymorphisms in 145 progeny from a Mus spretus x C57BL/6J backcross indicates that Scn9a is very tightly linked to Scn1a (gene encoding the type I sodium channel {alpha}-subunit of the brain) and forms part of a cluster of four Scna genes located on mouse chromosome 2. 17 refs., 1 fig., 3 tabs.

  3. A multilevel prediction of physiological response to challenge: Interactions among child maltreatment, neighborhood crime, endothelial nitric oxide synthase gene (eNOS), and GABA(A) receptor subunit alpha-6 gene (GABRA6).

    Science.gov (United States)

    Lynch, Michael; Manly, Jody Todd; Cicchetti, Dante

    2015-11-01

    Physiological response to stress has been linked to a variety of healthy and pathological conditions. The current study conducted a multilevel examination of interactions among environmental toxins (i.e., neighborhood crime and child maltreatment) and specific genetic polymorphisms of the endothelial nitric oxide synthase gene (eNOS) and GABA(A) receptor subunit alpha-6 gene (GABRA6). One hundred eighty-six children were recruited at age 4. The presence or absence of child maltreatment as well as the amount of crime that occurred in their neighborhood during the previous year were determined at that time. At age 9, the children were brought to the lab, where their physiological response to a cognitive challenge (i.e., change in the amplitude of the respiratory sinus arrhythmia) was assessed and DNA samples were collected for subsequent genotyping. The results confirmed that complex Gene × Gene, Environment × Environment, and Gene × Environment interactions were associated with different patterns of respiratory sinus arrhythmia reactivity. The implications for future research and evidence-based intervention are discussed.

  4. Hypersecretion of the alpha-subunit in clinically non-functioning pituitary adenomas: Diagnostic accuracy is improved by adding alpha-subunit/gonadotropin ratio to levels of alpha-subunit

    DEFF Research Database (Denmark)

    Andersen, Marianne; Ganc-Petersen, Joanna; Jørgensen, Jens Otto Lunde;

    2010-01-01

    BACKGROUND: In vitro, the majority of clinically non-functioning pituitary adenomas (NFPAs) produce gonadotropins or their alpha-subunit; however, in vivo, measurements of alpha-subunit levels may not accurately detect the hypersecretion of the alpha-subunit. AIM: We wanted to estimate the refere......BACKGROUND: In vitro, the majority of clinically non-functioning pituitary adenomas (NFPAs) produce gonadotropins or their alpha-subunit; however, in vivo, measurements of alpha-subunit levels may not accurately detect the hypersecretion of the alpha-subunit. AIM: We wanted to estimate...... the reference intervals and decision limits for gonadotropin alpha-subunit, LH and FSH levels, and aratio (alpha-subunit/LH+FSH), especially taking into consideration patient gender and menstrual status. Furthermore, we wanted to examine if the diagnostic utility of alpha-subunit hypersecretion was improved...... patients with NFPAs. Gonadotropin alpha-subunit, LH and FSH levels were measured and alpha-ratios were calculated. RESULTS: In healthy adults, the cut-offs for alpha-subunit levels were significantly different between men and pre- and postmenopausal women: the cut-offs were 1.10, 0.48 and 3.76 IU...

  5. Homologous and unique G protein alpha subunits in the nematode Caenorhabditis elegans.

    Science.gov (United States)

    Lochrie, M A; Mendel, J E; Sternberg, P W; Simon, M I

    1991-01-01

    A cDNA corresponding to a known G protein alpha subunit, the alpha subunit of Go (Go alpha), was isolated and sequenced. The predicted amino acid sequence of C. elegans Go alpha is 80-87% identical to other Go alpha sequences. An mRNA that hybridizes to the C. elegans Go alpha cDNA can be detected on Northern blots. A C. elegans protein that crossreacts with antibovine Go alpha antibody can be detected on immunoblots. A cosmid clone containing the C. elegans Go alpha gene (goa-1) was isolated and mapped to chromosome I. The genomic fragments of three other C. elegans G protein alpha subunit genes (gpa-1, gpa-2, and gpa-3) have been isolated using the polymerase chain reaction. The corresponding cosmid clones were isolated and mapped to disperse locations on chromosome V. The sequences of two of the genes, gpa-1 and gpa-3, were determined. The predicted amino acid sequences of gpa-1 and gpa-3 are only 48% identical to each other. Therefore, they are likely to have distinct functions. In addition they are not homologous enough to G protein alpha subunits in other organisms to be classified. Thus C. elegans has G proteins that are identifiable homologues of mammalian G proteins as well as G proteins that appear to be unique to C. elegans. Study of identifiable G proteins in C. elegans may result in a further understanding of their function in other organisms, whereas study of the novel G proteins may provide an understanding of unique aspects of nematode physiology. Images PMID:1907494

  6. An increased expression of Ca(2+) channel alpha(1A) subunit immunoreactivity in deep cerebellar neurons of rolling mouse Nagoya.

    Science.gov (United States)

    Sawada, K; Sakata-Haga, H; Ando, M; Takeda, N; Fukui, Y

    2001-12-01

    Rolling mouse Nagoya (RMN) is an ataxic mutant and carries a mutation in the gene coding for the alpha(1A) subunit of the P/Q-type Ca(2+) channel. We examined the immunohistochemical expression of the alpha(1A) subunit in deep cerebellar nuclei of RMN. The antibody used recognized residues 865-883 of the mouse alpha(1A) subunit not overlapping the altered sequences in RMN. In RMN, many neurons exhibited definite alpha(1A) subunit-staining in the medial nucleus, interposed nucleus, and lateral nucleus of deep cerebellar nuclei. The number of positive neurons in these nuclei was significantly higher in RMN than in controls. Increased expression of the alpha(1A) subunit in deep cerebellar neurons might compensate for the altered function of the P/Q-type Ca(2+) channel of RMN.

  7. Folding, stability, and physical properties of the alpha subunit of bacterial luciferase.

    Science.gov (United States)

    Noland, B W; Dangott, L J; Baldwin, T O

    1999-12-01

    Bacterial luciferase is a heterodimeric (alphabeta) enzyme composed of homologous subunits. When the Vibrio harveyi luxA gene is expressed in Escherichia coli, the alpha subunit accumulates to high levels. The alpha subunit has a well-defined near-UV circular dichroism spectrum and a higher intrinsic fluorescence than the heterodimer, demonstrating fluorescence quenching in the enzyme which is reduced in the free subunit [Sinclair, J. F., Waddle, J. J., Waddill, W. F., and Baldwin, T. O. (1993) Biochemistry 32, 5036-5044]. Analytical ultracentrifugation of the alpha subunit has revealed a reversible monomer to dimer equilibrium with a dissociation constant of 14.9 +/- 4.0 microM at 18 degrees C in 50 mM phosphate and 100 mM NaCl, pH 7.0. The alpha subunit unfolded and refolded reversibly in urea-containing buffers by a three-state mechanism. The first transition occurred over the range of 0-2 M urea with an associated free-energy change of 2.24 +/- 0.25 kcal/mol at 18 degrees C in 50 mM phosphate buffer, pH 7.0. The second, occurring between 2.5 and 3.5 M urea, comprised a cooperative transition with a free-energy change of 6.50 +/- 0.75 kcal/mol. The intermediate species, populated maximally at ca. 2 M urea, has defined near-UV circular dichroism spectral properties distinct from either the native or the denatured states. The intrinsic fluorescence of the intermediate suggested that, although the quantum yield had decreased, the tryptophanyl residues remained largely buried. The far-UV circular dichroism spectrum of the intermediate indicated that it had lost ca. 40% of its native secondary structure. N-Terminal sequencing of the products of limited proteolysis of the intermediate showed that the C-terminal region of the alpha subunit became protease labile over the urea concentration range at which the intermediate was maximally populated. These observations have led us to propose an unfolding model in which the first transition is the unfolding of a C

  8. Evidence for multiple promoters of the human IL-5 receptor alpha subunit gene: a novel 6-base pair element determines cell-specific promoter function.

    Science.gov (United States)

    Zhang, J; Kuvelkar, R; Cheewatrakoolpong, B; Williams, S; Egan, R W; Billah, M M

    1997-12-01

    In addition to a previously characterized promoter (P1), we now show the existence of a second promoter for the human IL-5Ralpha gene. Initially, a genomic region (P2) 5' upstream of human IL-5Ralpha exon 2 was cloned by an inverted PCR. The transcriptional start site was then mapped to a deoxycytidine (C) residue within P2 by analyzing cellular mRNA with both the 5' rapid amplification of cDNA end-PCR and S1 nuclease protection assays. Transfection of eosinophilic HL-60 cells with reporter gene constructs in which either P1 or P2 was linked to the bacterial chloramphenicol acetyltransferase (CAT) gene resulted in CAT expression; little or no CAT expression occurred in other myeloid and nonmyeloid cell lines. Deletion studies showed that a 66-bp region, ranging from -31 to +35, was sufficient to promote CAT expression in eosinophilic HL-60 cells. Analysis of linker-scanning mutants identified a novel 6-bp element (5' CTAATT 3') spanning -19 to -14 that was essential for P2 promoter activity. In electrophoretic mobility shift assays, a P2 region from -31 to +1 containing the unique 6-bp element, when used as a probe, formed a complex with a protein(s) that was found only in the eosinophilic cell line. This binding activity was lost upon replacement of the 6-bp element with a 6-bp linker, suggesting that this element likely serves as the binding site for an eosinophilic HL-60 cell-specific transcription factor(s). Together, these data suggest an important role for P2 promoter in the regulation of eosinophil-specific expression of the human IL-5 receptor alpha gene.

  9. Genotypic to expression profiling of bovine calcium channel, voltage-dependent, alpha-2/delta subunit 1 gene, and their association with bovine mastitis among Frieswal (HFX Sahiwal) crossbred cattle of Indian origin.

    Science.gov (United States)

    Deb, Rajib; Singh, Umesh; Kumar, Sushil; Kumar, Arun; Singh, Rani; Sengar, Gyanendra; Mann, Sandeep; Sharma, Arjava

    2014-04-01

    Calcium channel, voltage-dependent, alpha-2/delta subunit 1 (CACNA2D1) gene is considered to be an important noncytokine candidate gene influencing mastitis. Scanty of reports are available until today regarding the role play of CACNA2D1 gene on the susceptibility of bovine mastitis. We interrogated the CACNA2D1 G519663A [A>G] SNP by PCR-RFLP among two hundreds Frieswal (HF X Sahiwal) crossbred cattle of Indian origin. Genotypic frequency of AA (51.5, n=101) was comparatively higher than AG (35, n=70) and GG (14.5, n=29). Association of Somatic cell score (SCS) with genotypes revealed that, GG genotypes showing lesser count (less susceptible to mastitis) compare to AA and AG. Relative expression of CACNA2D1 transcript (in milk samples) was significantly higher among GG than AG and AA. Further we have also isolated blood sample from the all groups and PBMCs were cultured from each blood sample as per the standard protocol. They were treated with Calcium channel blocker and the expression level of the CACNA2D1 gene was evaluated by Real Time PCR. Results show that expression level decline in each genotypic group after treatment and expression level of GG are again significantly higher than AA and AG. Thus, it may be concluded that GG genotypic animals are favorable for selecting disease resistant breeds.

  10. [A novel gene (Aa-accA ) encoding acetyl-CoA carboxyltransferase alpha-subunit of Alkalimonas amylolytica N10 enhances salt and alkali tolerance of Escherichia coli and tobacco BY-2 cells].

    Science.gov (United States)

    Xian, Mingjie; Zhai, Lei; Zhong, Naiqin; Ma, Yiwei; Xue, Yanfen; Ma, Yanhe

    2013-08-04

    Acetyl-CoA carboxylase (ACC) catalyzes the first step of fatty acid synthesis. In most bacteria, ACC is composed of four subunits encoded by accA, accB, accC, and accD. Of them, accA encodes acetyl-CoA carboxyltransferase alpha-subunit. Our prior work on proteomics of Alkalimonas amylolytica N10 showed that the expression of the Aa-accA has a remarkable response to salt and alkali stress. This research aimed to find out the Aa-accA gene contributing to salt and alkali tolerance. The Aa-accA was amplified by PCR from A. amylolytica N10 and expressed in E. coli K12 host. The effects of Aa-accA expression on the growth of transgenic strains were examined under different NaCl concentration and pH conditions. Transgenic tobacco BY-2 cells harboring Aa-accA were also generated via Agrobacterium-mediated transformation. The viability of BY-2 cells was determined with FDA staining method after salt and alkali shock. The Aa-accA gene product has 318 amino acids and is homologous to the carboxyl transferase domain of acyl-CoA carboxylases. It showed 76% identity with AccA (acetyl-CoA carboxylase carboxyltransferase subunit alpha) from E. coli. Compared to the wild-type strains, transgenic E. coli K12 strain containing Aa-accA showed remarkable growth superiority when grown in increased NaCl concentrations and pH levels. The final cell density of the transgenic strains was 2.6 and 3.5 times higher than that of the control type when they were cultivated in LB medium containing 6% (W/V) NaCl and at pH 9, respectively. Complementary expression of Aa-accA in an accA-depletion E. coli can recover the tolerance of K12 delta accA to salt and alkali stresses to some extent. Similar to the transgenic E. coli, transgenic tobacco BY-2 cells showed higher percentages of viability compared to the wild BY-2 cells under the salt or alkali stress condition. We found that Aa-accA from A. amylolytica N10 overexpression enhances the tolerance of both transgenic E. coli and tobacco BY-2 cells to

  11. Integrin alpha(3)-subunit expression modulates alveolar epithelial cell monolayer formation.

    Science.gov (United States)

    Lubman, R L; Zhang, X L; Zheng, J; Ocampo, L; Lopez, M Z; Veeraraghavan, S; Zabski, S M; Danto, S I; Borok, Z

    2000-07-01

    We investigated expression of the alpha(3)-integrin subunit by rat alveolar epithelial cells (AECs) grown in primary culture as well as the effects of monoclonal antibodies with blocking activity against the alpha(3)-integrin subunit on AEC monolayer formation. alpha(3)-Integrin subunit mRNA and protein were detectable in AECs on day 1 and increased with time in culture. alpha(3)- and beta(1)-integrin subunits coprecipitated in immunoprecipitation experiments with alpha(3)- and beta(1)-subunit-specific antibodies, consistent with their association as the alpha(3)beta(1)-integrin receptor at the cell membrane. Treatment with blocking anti-alpha(3) monoclonal antibody from day 0 delayed development of transepithelial resistance, reduced transepithelial resistance through day 5 compared with that in untreated AECs, and resulted in large subconfluent patches in monolayers viewed by scanning electron microscopy on day 3. These data indicate that alpha(3)- and beta(1)-integrin subunits are expressed in AEC monolayers where they form the heterodimeric alpha(3)beta(1)-integrin receptor at the cell membrane. Blockade of the alpha(3)-integrin subunit inhibits formation of confluent AEC monolayers. We conclude that the alpha(3)-integrin subunit modulates formation of AEC monolayers by virtue of the key role of the alpha(3)beta(1)-integrin receptor in AEC adhesion.

  12. Transcriptional regulation of the nuclear gene encoding the alpha-subunit of the mammalian mitochondrial F1F0 ATP synthase complex: role for the orphan nuclear receptor, COUP-TFII/ARP-1.

    Science.gov (United States)

    Jordan, Elzora M; Worley, Teri; Breen, Gail A M

    2003-03-11

    Our laboratory has been studying the transcriptional regulation of the nuclear gene (ATPA) that encodes the alpha-subunit of the mammalian mitochondrial F1F0 ATP synthase complex. We have previously determined that the regulatory factor, upstream stimulatory factor 2 (USF2), can stimulate transcription of the ATPA gene through the cis-acting regulatory element 1 in the upstream promoter of this gene. In this study, we used the yeast one-hybrid screening method to identify another factor, COUP-TFII/ARP-1, which also binds to the ATPA cis-acting regulatory element 1. Binding of the orphan nuclear receptor, COUP-TFII/ARP-1, to the ATPA regulatory element 1 was confirmed using electrophoretic mobility shift experiments, and COUP-TFII/ARP-1-containing complexes were detected in HeLa cell nuclear extracts. A mutational analysis indicated that the binding site for COUP-TFII/ARP-1 in the ATPA regulatory element 1 is an imperfect direct repeat of a nuclear receptor response element (A/GGGTCA) with a spacer of three nucleotides. Functional assays in HeLa cells showed that COUP-TFII/ARP-1 represses the ATPA promoter activity in a dose- and sequence-dependent manner. Furthermore, cotransfection assays demonstrated that COUP-TFII/ARP-1 inhibits the USF2-mediated activation of the wild-type ATPA gene promoter but not a mutant promoter that is defective in COUP-TFII/ARP-1-binding. Overexpression of USF2 reversed the COUP-TFII/ARP-1-mediated repression of the ATPA promoter. Mobility shift assays revealed that COUP-TFII/ARP-1 and USF2 compete for binding to the ATPA regulatory element 1. Thus, the ATPA gene is regulated by a multifunctional binding site through which the transcription factors, COUP-TFII/ARP-1 and USF2, bind and exert their antagonistic effects.

  13. The human [gamma]-aminobutyric acid receptor subunit [beta]3 and [alpha]5 gene cluster in chromosome 15q11-q13 is rich in highly polymorphic (CA)[sub n] repeats

    Energy Technology Data Exchange (ETDEWEB)

    Glatt, K.; Lalande, M. (Howard Hughes Medical Institute, Boston, MA (United States)); Sinnett, D. (Harvard Medical School, Boston, MA (United States))

    1994-01-01

    The [gamma]-aminobutyric acid (GABA[sub A]) receptor [beta]33 (GABRB3) and [alpha]5 (GABRA5) subunit genes have been localized to the Angelman and Prader-Willi syndrome region of chromosome 15q11-q13. GABRB3, which encompasses 250 kb, is located 100 kb proximal of GABRA5, with the two genes arranged in head-to-head transcriptional orientation. In screening 135 kb of cloned DNA within a 260-kb interval extending from within GABRB3 to the 5[prime] end of GABRA5, 10 new (CA), repeats have been identified. Five of these have been analyzed in detail and found to be highly polymorphic, with the polymorphism information content (PIC) ranging from 0.7 to 0.85 and with heterozygosities of 67 to 94%. In the clones from GABRB3/GABRA5 region, therefore, the frequency of (CA)[sub n] with PICs [ge] 0.7 is 1 per 27 kb. Previous estimates of the density of (CA)[sub n] with PICs [ge] 0.7 in the human genome have been approximately 10-fold lower. The GABRB3/GABRA5 region appears, therefore, to be enriched for highly informative (CA)[sub n]. This set of closely spaced, short tandem repeat polymorphisms will be useful in the molecular analyses of Prader-Willi and Angelman syndromes and in high-resolution studies of genetic recombination within this region. 21 refs., 2 figs., 1 tab.

  14. Similarity and divergence between the RNA polymerase alpha subunits from hyperthermophilic Thermotoga maritima and mesophilic Escherichia coli bacteria.

    Science.gov (United States)

    Braun, Frederique; Marhuenda, Fanny B; Morin, Amelie; Guevel, Laetitia; Fleury, Fabrice; Takahashi, Masayuki; Sakanyan, Vehary

    2006-10-01

    The alpha subunit (alphaTm) of Thermotoga maritima RNA polymerase has been characterized to investigate its role in transcriptional regulation in one of the few known anaerobic hyperthermophilic bacteria. The highly thermostable alphaTm shares 54% similarity with its Escherichia coli analogue (alphaEc). The T. maritima rpoA gene coding the alpha subunit does not complement the thermosensitive rpoA112 mutation of E. coli. However, alphaTm and alphaEc show similar folding patterns as determined by circular dichroism. Purified alphaTm binds to the T. maritima PargGo promoter region (probably to a UP-element) and Arg282 appears to be crucial for DNA binding. The thermostable protein is also able to interact with transcription regulatory proteins, like ArgR from T. neapolitana or CRP from E. coli. These data indicate that the RNA polymerase alpha subunit might play a crucial role in the modulation of gene expression in hyperthermophiles.

  15. The Escherichia coli RNA polymerase alpha subunit and transcriptional activation by bacteriophage lambda CII protein.

    Science.gov (United States)

    Gabig, M; Obuchowski, M; Ciesielska, A; Latała, B; Wegrzyn, A; Thomas, M S; Wegrzyn, G

    1998-01-01

    Bacteriophage lambda is not able to lysogenise the Escherichia coli rpoA341 mutant. This mutation causes a single amino acid substitution Lys271Glu in the C-terminal domain of the RNA polymerase alpha subunit (alphaCTD). Our previous studies indicated that the impaired lysogenisation of the rpoA341 host is due to a defect in transcriptional activation by the phage CII protein and suggested a role for alphaCTD in this process. Here we used a series of truncation and point mutants in the rpoA gene placed on a plasmid to investigate the process of transcriptional activation by the cII gene product. Our results indicate that amino-acid residues 265, 268 and 271 in the a subunit may play an important role in the CII-mediated activation of the pE promoter (most probably residue 271) or may be involved in putative interactions between alphaCTD and an UP-like element near pE (most probably residues 265 and 268). Measurement of the activity of pE-lacZ, pI-lacZ and p(aQ)-lacZ fusions in the rpoA+ and rpoA341 hosts demonstrated that the mechanism of activation of these CII-dependent promoters may be in each case different.

  16. Isolation and characterization of recombinant human casein kinase II subunits alpha and beta from bacteria

    DEFF Research Database (Denmark)

    Grankowski, N; Boldyreff, B; Issinger, O G

    1991-01-01

    cDNA encoding the casein kinase II (CKII) subunits alpha and beta of human origin were expressed in Escherichia coli using expression vector pT7-7. Significant expression was obtained with E. coli BL21(DE3). The CKII subunits accounted for approximately 30% of the bacterial protein; however, most...... of the expressed proteins were produced in an insoluble form. The recombinant CKII alpha subunit was purified by DEAE-cellulose chromatography, followed by phosphocellulose and heparin-agarose chromatography. The recombinant CKII beta subunit was extracted from the insoluble pellet and purified in a single step...... on phosphocellulose. From 10 g bacterial cells, the yield of soluble protein was 12 mg alpha subunit and 5 mg beta subunit. SDS/PAGE analysis of the purified recombinant proteins indicated molecular masses of 42 kDa and 26 kDa for the alpha and beta subunits, respectively, in agreement with the molecular masses...

  17. Diverse functional consequences of mutations in the Na+/K+-ATPase alpha2-subunit causing familial hemiplegic migraine type 2.

    NARCIS (Netherlands)

    Tavraz, N.N.; Friedrich, T.; Durr, K.L.; Koenderink, J.B.; Bamberg, E.; Freilinger, T.; Dichgans, M.

    2008-01-01

    Mutations in ATP1A2, the gene coding for the Na(+)/K(+)-ATPase alpha(2)-subunit, are associated with both familial hemiplegic migraine and sporadic cases of hemiplegic migraine. In this study, we examined the functional properties of 11 ATP1A2 mutations associated with familial or sporadic hemiplegi

  18. Formation of fluorescent proteins by the attachment of phycoerythrobilin to R-phycoerythrin alpha and beta apo-subunits.

    Science.gov (United States)

    Isailovic, Dragan; Sultana, Ishrat; Phillips, Gregory J; Yeung, Edward S

    2006-11-01

    Formation of fluorescent proteins was explored after incubation of recombinant apo-subunits of phycobiliprotein R-phycoerythrin with phycoerythrobilin chromophore. Alpha and beta apo-subunit genes of R-phycoerythrin from red algae Polisiphonia boldii were cloned in plasmid pET-21d(+). Hexahistidine-tagged alpha and beta apo-subunits were expressed in Escherichia coli. Although expressed apo-subunits formed inclusion bodies, fluorescent holo-subunits were constituted after incubation of E. coli cells with phycoerythrobilin. Holo-subunits contained both phycoerythrobilin and urobilin chromophores. Fluorescence and differential interference contrast microscopy showed polar location of holo-subunit inclusion bodies in bacterial cells. Cells containing fluorescent holo-subunits were several times brighter than control cells as found by fluorescence microscopy and flow cytometry. The addition of phycoerythrobilin to cells did not show cytotoxic effects, in contrast to expression of proteins in inclusion bodies. In an attempt to improve solubility, R-phycoerythrin apo-subunits were fused to maltose-binding protein and incubated with phycoerythrobilin both in vitro and in vivo. Highly fluorescent soluble fusion proteins containing phycoerythrobilin as the sole chromophore were formed. Fusion proteins were localized by fluorescence microscopy either throughout E. coli cells or at cell poles. Flow cytometry showed that cells containing fluorescent fusion proteins were up to 10 times brighter than control cells. Results indicate that fluorescent proteins formed by attachment of phycoerythrobilin to expressed apo-subunits of phycobiliproteins can be used as fluorescent probes for analysis of cells by microscopy and flow cytometry. A unique property of these fluorescent reporters is their utility in both properly folded (soluble) subunits and subunits aggregated in inclusion bodies.

  19. Translocation of a phycoerythrin alpha subunit across five biological membranes.

    Science.gov (United States)

    Gould, Sven B; Fan, Enguo; Hempel, Franziska; Maier, Uwe-G; Klösgen, Ralf Bernd

    2007-10-12

    Cryptophytes, unicellular algae, evolved by secondary endosymbiosis and contain plastids surrounded by four membranes. In contrast to cyanobacteria and red algae, their phycobiliproteins do not assemble into phycobilisomes and are located within the thylakoid lumen instead of the stroma. We identified two gene families encoding phycoerythrin alpha and light-harvesting complex proteins from an expressed sequence tag library of the cryptophyte Guillardia theta. The proteins bear a bipartite topogenic signal responsible for the transport of nuclear encoded proteins via the ER into the plastid. Analysis of the phycoerythrin alpha sequences revealed that more than half of them carry an additional, third topogenic signal comprising a twin arginine motif, which is indicative of Tat (twin arginine transport)-specific targeting signals. We performed import studies with several derivatives of one member using a diatom transformation system, as well as intact chloroplasts and thylakoid vesicles isolated from pea. We demonstrated the different targeting properties of each individual part of the tripartite leader and show that phycoerythrin alpha is transported across the thylakoid membrane into the thylakoid lumen and protease-protected. Furthermore, we showed that thylakoid transport of phycoerythrin alpha takes place by the Tat pathway even if the 36 amino acid long bipartite topogenic signal precedes the actual twin arginine signal. This is the first experimental evidence of a protein being targeted across five biological membranes.

  20. Association study of polymorphisms in the alpha 7 nicotinic acetylcholine receptor subunit and catechol-o-methyl transferase genes with sensory gating in first-episode schizophrenia.

    Science.gov (United States)

    Liu, Xia; Hong, Xiaohong; Chan, Raymond C K; Kong, Fanzhi; Peng, Zhizhen; Wan, Xiaona; Wang, Changqing; Cheng, Lu

    2013-10-30

    The purpose of the current study was to explore the association of auditory P50 sensory gating (P50) and prepulse inhibition (PPI) of schizophrenia with polymorphisms in the CHRNA7 and COMT genes. One hundred and fourty patients with schizophrenia participated in this study. They were administered the tests P50 and PPI. Moreover, three single nucleotide polymorphisms (SNPs) (rs2337980, rs1909884 and rs883473) in CHRNA7 and three SNPs (rs4680, rs737865 and rs165599) in COMT were selected to be genotyped by polyacrylamide gel microarray techniques. P50 index showed significant reduction in S2 amplitude between wild-type and mutation groups in the COMT rs4680. S1 amplitude of mutation group in the COMT rs737865 was also lower compared to wild-type group. PPI index revealed a shorter pulse latency of mutation group in the rs4680. The suppression ratio of mutation group was lower in COMT rs165599. Negative findings were shown between comparisons in all the CHRNA7 SNPs. We find that P50 and PPI may be influenced by COMT rs4680 polymorphisms in schizophrenia; more excitingly, we find that P50 might be influenced by COMT rs737865 polymorphisms and PPI may be influenced by COMT rs165599 polymorphisms in schizophrenia, and their mutations are associated with the reduction of the risk of P50 or PPI defects in schizophrenia. Futher studies with a larger number of subjects are needed to verify the present findings.

  1. 5-HT7 receptor is coupled to G alpha subunits of heterotrimeric G12-protein to regulate gene transcription and neuronal morphology.

    Science.gov (United States)

    Kvachnina, Elena; Liu, Guoquan; Dityatev, Alexander; Renner, Ute; Dumuis, Aline; Richter, Diethelm W; Dityateva, Galina; Schachner, Melitta; Voyno-Yasenetskaya, Tatyana A; Ponimaskin, Evgeni G

    2005-08-24

    The neurotransmitter serotonin (5-HT) plays an important role in the regulation of multiple events in the CNS. We demonstrated recently a coupling between the 5-HT4 receptor and the heterotrimeric G13-protein resulting in RhoA-dependent neurite retraction and cell rounding (Ponimaskin et al., 2002). In the present study, we identified G12 as an additional G-protein that can be activated by another member of serotonin receptors, the 5-HT7 receptor. Expression of 5-HT7 receptor induced constitutive and agonist-dependent activation of a serum response element-mediated gene transcription through G12-mediated activation of small GTPases. In NIH3T3 cells, activation of the 5-HT7 receptor induced filopodia formation via a Cdc42-mediated pathway correlating with RhoA-dependent cell rounding. In mouse hippocampal neurons, activation of the endogenous 5-HT7 receptors significantly increased neurite length, whereas stimulation of 5-HT4 receptors led to a decrease in the length and number of neurites. These data demonstrate distinct roles for 5-HT7R/G12 and 5-HT4R/G13 signaling pathways in neurite outgrowth and retraction, suggesting that serotonin plays a prominent role in regulating the neuronal cytoarchitecture in addition to its classical role as neurotransmitter.

  2. Quantitative analysis of interferon alpha receptor subunit 1 and suppressor of cytokine signaling 1 gene transcription in blood cells of patients with chronic hepatitis C

    Directory of Open Access Journals (Sweden)

    Sedeño-Monge Virginia

    2010-09-01

    Full Text Available Abstract Background Interferon (IFN-α receptor 1 (ifnar1 and suppressor of cytokine signaling 1 (socs1 transcription levels were quantified in peripheral blood mononuclear cells (PBMC of 59 patients infected with hepatitis C virus (HCV and 17 non-infected individuals. Samples were obtained from patients infected with HCV that were either untreated or treated with IFN-α2 plus ribavirin for 1 year and divided into responders and non-responders based on viral load reduction 6 months after treatment. Ifnar1 and socs1 transcription was quantified by real-time RT-PCR, and the fold difference (2-ΔΔCT with respect to hprt housekeeping gene was calculated. Results Ifnar1 transcription increased significantly in HCV-infected patients either untreated (3.26 ± 0.31, responders (3.1 ± 0.23 and non-responders (2.18 ± 0.23 with respect to non-infected individuals (1 ± 0.34; P = 0.005. Ifnar1 transcription increased significantly (P = 0.003 in patients infected with HCV genotypes 1a (4.74 ± 0.25 and 1b (2.81 ± 0.25 but not in 1a1b (1.58 ± 0.21. No association was found of Ifnar1 transcription with disease progress, initial viral load or other clinical factors. With respect to socs1 transcription, values were similar for non-infected individuals (1 ± 0.28 and untreated patients (0.99 ± 0.41 but increased in responders (2.81 ± 0.17 and non-responder patients (1.67 ± 0.41. Difference between responder and non-responder patients was not statistically significant. Socs1 transcription increased in patients infected with HCV genotypes 1a and 1b (2.87 ± 0.45 and 2.22 ± 0.17, respectively but not in 1a1b (1.28 ± 0.40. Socs1 transcript was absent in three patients infected with HCV genotype 1b. A weak correlation between ifnar1 and socs1 transcription was found, when Spearman's correlation coefficient was calculated. Conclusion Our results suggest that HCV infection may up-regulate ifnar1 transcription. HCV genotypes differ in their capacity to affect

  3. Effects of terpenoid precursor feeding on Catharanthus roseus hairy roots over-expressing the alpha or the alpha and beta subunits of anthranilate synthase.

    Science.gov (United States)

    Peebles, Christie A M; Hong, Seung-Beom; Gibson, Susan I; Shanks, Jacqueline V; San, Ka-Yiu

    2006-02-20

    Among the pharmacologically important terpenoid indole alkaloids produced by Catharanthus roseus are the anti-cancer drugs vinblastine and vincristine. These two drugs are produced in small yields within the plant, which makes them expensive to produce commercially. Metabolic engineering has focused on increasing flux through this pathway by various means such as elicitation, precursor feeding, and introduction of genes encoding specific metabolic enzymes into the plant. Recently in our lab, a feedback-resistant anthranilate synthase alpha subunit was over-expressed in C. roseus hairy roots under the control of a glucocorticoid inducible promoter system. Upon induction we observed a large increase in the indole precursors, tryptophan, and tryptamine. The current work explores the effects of over-expressing the anthranilate synthase alpha or alpha and beta subunits in combination with feeding with the terpenoid precursors 1-deoxy-D-xylulose, loganin, and secologanin. In feeding 1-deoxy-D-xylulose to the hairy root line expressing the anthranilate synthase alpha subunit, we observed an increase of 125% in hörhammericine levels in the induced samples, while loganin feeding increased catharanthine by 45% in the induced samples. Loganin feeding to the hairy root line expressing anthranilate synthase alpha and beta subunits increases catharanthine by 26%, ajmalicine by 84%, lochnericine by 119%, and tabersonine by 225% in the induced samples. These results suggest that the terpenoid precursors to the terpenoid indole alkaloids are important factors in terpenoid indole alkaloid production.

  4. Editing modifies the GABA(A) receptor subunit alpha3

    DEFF Research Database (Denmark)

    Ohlson, Johan; Pedersen, Jakob Skou; Haussler, David

    2007-01-01

    Adenosine to inosine (A-to-I) pre-mRNA editing by the ADAR enzyme family has the potential to increase the variety of the proteome. This editing by adenosine deamination is essential in mammals for a functional brain. To detect novel substrates for A-to-I editing we have used an experimental method...... to find selectively edited sites and combined it with bioinformatic techniques that find stem-loop structures suitable for editing. We present here the first verified editing candidate detected by this screening procedure. We show that Gabra-3, which codes for the alpha3 subunit of the GABA(A) receptor......, is a substrate for editing by both ADAR1 and ADAR2. Editing of the Gabra-3 mRNA recodes an isoleucine to a methionine. The extent of editing is low at birth but increases with age, reaching close to 100% in the adult brain. We therefore propose that editing of the Gabra-3 mRNA is important for normal brain...

  5. Separation and characterization of alpha-chain subunits from tilapia (Tilapia zillii) skin gelatin using ultrafiltration.

    Science.gov (United States)

    Chen, Shulin; Tang, Lanlan; Su, Wenjin; Weng, Wuyin; Osako, Kazufumi; Tanaka, Munehiko

    2015-12-01

    Alpha-chain subunits were separated from tilapia skin gelatin using ultrafiltration, and the physicochemical properties of obtained subunits were investigated. As a result, α1-subunit and α2-subunit could be successfully separated by 100 kDa MWCO regenerated cellulose membranes and 150 kDa MWCO polyethersulfone membranes, respectively. Glycine was the most dominant amino acid in both α1-subunit and α2-subunit. However, the tyrosine content was higher in α2-subunit than in α1-subunit, resulting in strong absorption near 280 nm observed in the UV absorption spectrum. Based on the DSC analysis, it was found that the glass transition temperatures of gelatin, α1-subunit and α2-subunit were 136.48 °C, 126.77 °C and 119.43 °C, respectively. Moreover, the reduced viscosity and denaturation temperature of α1-subunit were higher than those of α2-subunit, and the reduced viscosity reached the highest when α-subunits were mixed with α1/α2 ratio of approximately 2, suggesting that α1-subunit plays a more important role in the thermostability of gelatin than α2-subunit.

  6. Alternatively spliced forms of the Drosophila alphaPS2 subunit of integrin are sufficient for viability and can replace the function of the alphaPS1 subunit of integrin in the retina.

    Science.gov (United States)

    Roote, C E; Zusman, S

    1996-06-01

    The Drosophila inflated (if) gene encodes the alphaPS2 subunit of the PS family of integrins. The if transcript is spliced such that alphaPS2 is found in two alternative forms, alphaPS2(C) and alphaPS2(m8), which differ by 25 amino acid residues in a region shown to affect cation requirements and ligand specificity. In this study, we examine the functional significance of the protein isoforms of if by analyzing the ability of transgenes producing only one isoform to rescue developmental abnormalities associated with complete loss of PS2 integrin. We find that either form of alphaPS2 is sufficient to rescue if- animals to viability; however, the alphaPS2(C) form promotes higher survival of the organism. Furthermore, these studies suggest distinct roles for alphaPS2(C) and alphaPS2(m8) during development. When expressed in the developing wing, alphaPS2(m8) is more efficient at rescuing the if wing blister phenotype than is alphaPS2(C). Expression of alphaPS2(C) in the eye produces dominant disruption of photoreceptor organization. We have also examined the ability of alphaPS2 and alphaPS1 to maintain photoreceptor organization in the Drosophila retina. Clonal analysis of sectioned eyes suggests a requirement for alphaPS1, but not alphaPS2. However, ectopic expression of if(m8) or if(C) shows that either splice form Of alphaPS2 can functionally replace alphaPS1 and rescue the mew eye phenotype.

  7. A revised model for AMP-activated protein kinase structure: The alpha-subunit binds to both the beta- and gamma-subunits although there is no direct binding between the beta- and gamma-subunits.

    Science.gov (United States)

    Wong, Kelly A; Lodish, Harvey F

    2006-11-24

    The 5'-AMP-activated protein kinase (AMPK) is a master sensor for cellular metabolic energy state. It is activated by a high AMP/ATP ratio and leads to metabolic changes that conserve energy and utilize alternative cellular fuel sources. The kinase is composed of a heterotrimeric protein complex containing a catalytic alpha-subunit, an AMP-binding gamma-subunit, and a scaffolding beta-subunit thought to bind directly both the alpha- and gamma-subunits. Here, we use coimmunoprecipitation of proteins in transiently transfected cells to show that the alpha2-subunit binds directly not only to the beta-subunit, confirming previous work, but also to the gamma1-subunit. Deletion analysis of the alpha2-subunit reveals that the C-terminal 386-552 residues are sufficient to bind to the beta-subunit. The gamma1-subunit binds directly to the alpha2-subunit at two interaction sites, one within the catalytic domain consisting of alpha2 amino acids 1-312 and a second within residues 386-552. Binding of the alpha2 and the gamma1-subunits was not affected by 400 mum AMP or ATP. Furthermore, we show that the beta-subunit C terminus is essential for binding to the alpha2-subunit but, in contrast to previous work, the beta-subunit does not bind directly to the gamma1-subunit. Taken together, this study presents a new model for AMPK heterotrimer structure where through its C terminus the beta-subunit binds to the alpha-subunit that, in turn, binds to the gamma-subunit. There is no direct interaction between the beta- and gamma-subunits.

  8. Prefrontal GABA(A) receptor alpha-subunit expression in normal postnatal human development and schizophrenia.

    Science.gov (United States)

    Duncan, Carlotta E; Webster, Maree J; Rothmond, Debora A; Bahn, Sabine; Elashoff, Michael; Shannon Weickert, Cynthia

    2010-07-01

    Cortical GABA deficits that are consistently reported in schizophrenia may reflect an etiology of failed normal postnatal neurotransmitter maturation. Previous studies have found prefrontal cortical GABA(A) receptor alpha subunit alterations in schizophrenia, yet their relationship to normal developmental expression profiles in the human cortex has not been determined. The aim of this study was to quantify GABA(A) receptor alpha-subunit mRNA expression patterns in human dorsolateral prefrontal cortex (DLPFC) during normal postnatal development and in schizophrenia cases compared to controls. Transcript levels of GABA(A) receptor alpha subunits were measured using microarray and qPCR analysis of 60 normal individuals aged 6weeks to 49years and in 37 patients with schizophrenia/schizoaffective disorder and 37 matched controls. We detected robust opposing changes in cortical GABA(A) receptor alpha1 and alpha5 subunits during the first few years of postnatal development, with a 60% decrease in alpha5 mRNA expression and a doubling of alpha1 mRNA expression with increasing age. In our Australian schizophrenia cohort we detected decreased GAD67 mRNA expression (p=0.0012) and decreased alpha5 mRNA expression (p=0.038) in the DLPFC with no significant change of other alpha subunits. Our findings confirm that GABA deficits (reduced GAD67) are a consistent feature of schizophrenia postmortem brain studies. Our study does not confirm alterations in cortical alpha1 or alpha2 mRNA levels in the schizophrenic DLPFC, as seen in previous studies, but instead we report a novel down-regulation of alpha5 subunit mRNA suggesting that post-synaptic alterations of inhibitory receptors are an important feature of schizophrenia but may vary between cohorts. Copyright 2009 Elsevier Ltd. All rights reserved.

  9. Evaluation of native GABA(A) receptors containing an alpha 5 subunit.

    Science.gov (United States)

    Li, M; Szabo, A; Rosenberg, H C

    2001-02-09

    The type A receptor for gamma-aminobutyric acid (GABA), or GABA(A) receptor, is a pentamer of highly variable quaternary structure. It includes two alpha subunits, drawn from a pool of six genes, which largely determine benzodiazepine pharmacology of the receptor. In brain sections, both [(3)H]RY-80 (ethyl-8-acetylene-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5a][1,4]benzodiazepine-3-carboxylate) and [(3)H]L-655,708 (ethyl (S)-11,12,13,13a-tetrahydro-7-methoxy-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate), which are selective for the benzodiazepine site of alpha 5 subunit-containing receptors, showed high-affinity, specific binding, but to fewer regions than did the nonselective benzodiazepine, [(3)H]flunitrazepam. The pattern mirrored alpha 5 mRNA distribution, and was similar to that previously reported for [(3)H]L-655,708 binding. Displacement of [(3)H]RY-80 bound to hippocampal homogenates, and of [(3)H]flunitrazepam bound to cerebellar and hippocampal homogenates showed comparable displacement by flumazenil (K(i)'s 5--7 nM). However, the K(i)'s for diazepam and for clobazam to displace [(3)H]RY-80 binding in hippocampus were about fourfold higher than for [(3)H]flunitrazepam, and the K(i) for clonazepam was sixfold larger, suggesting that these benzodiazepine receptor agonists bind with relatively lower affinity at hippocampal alpha 5-containing receptors.

  10. First inactive conformation of CK2 alpha, the catalytic subunit of protein kinase CK2

    DEFF Research Database (Denmark)

    Raaf, Jennifer; Issinger, Olaf-Georg; Niefind, Karsten

    2009-01-01

    (EPKs). To function as regulatory key components, EPKs normally exist in inactive ground states and are activated only upon specific signals. Typically, this activation is accompanied by large conformational changes in helix alpha C and in the activation segment, leading to a characteristic arrangement......The Ser/Thr kinase casein kinase 2 (CK2) is a heterotetrameric enzyme composed of two catalytic chains (CK2alpha, catalytic subunit of CK2) attached to a dimer of two noncatalytic subunits (CK2beta, noncatalytic subunit of CK2). CK2alpha belongs to the superfamily of eukaryotic protein kinases...... of catalytic key elements. For CK2alpha, however, no strict physiological control of activity is known. Accordingly, CK2alpha was found so far exclusively in the characteristic conformation of active EPKs, which is, in this case, additionally stabilized by a unique intramolecular contact between the N...

  11. Functional protein expression of multiple sodium channel alpha- and beta-subunit isoforms in neonatal cardiomyocytes.

    Science.gov (United States)

    Kaufmann, Susann G; Westenbroek, Ruth E; Zechner, Christoph; Maass, Alexander H; Bischoff, Sebastian; Muck, Jenny; Wischmeyer, Erhard; Scheuer, Todd; Maier, Sebastian K G

    2010-01-01

    Voltage-gated sodium channels are composed of pore-forming alpha- and auxiliary beta-subunits and are responsible for the rapid depolarization of cardiac action potentials. Recent evidence indicates that neuronal tetrodotoxin (TTX) sensitive sodium channel alpha-subunits are expressed in the heart in addition to the predominant cardiac TTX-resistant Na(v)1.5 sodium channel alpha-subunit. These TTX-sensitive isoforms are preferentially localized in the transverse tubules of rodents. Since neonatal cardiomyocytes have yet to develop transverse tubules, we determined the complement of sodium channel subunits expressed in these cells. Neonatal rat ventricular cardiomyocytes were stained with antibodies specific for individual isoforms of sodium channel alpha- and beta-subunits. alpha-actinin, a component of the z-line, was used as an intracellular marker of sarcomere boundaries. TTX-sensitive sodium channel alpha-subunit isoforms Na(v)1.1, Na(v)1.2, Na(v)1.3, Na(v)1.4 and Na(v)1.6 were detected in neonatal rat heart but at levels reduced compared to the predominant cardiac alpha-subunit isoform, Na(v)1.5. Each of the beta-subunit isoforms (beta1-beta4) was also expressed in neonatal cardiac cells. In contrast to adult cardiomyocytes, the alpha-subunits are distributed in punctate clusters across the membrane surface of neonatal cardiomyocytes; no isoform-specific subcellular localization is observed. Voltage clamp recordings in the absence and presence of 20 nM TTX provided functional evidence for the presence of TTX-sensitive sodium current in neonatal ventricular myocardium which represents between 20 and 30% of the current, depending on membrane potential and experimental conditions. Thus, as in the adult heart, a range of sodium channel alpha-subunits are expressed in neonatal myocytes in addition to the predominant TTX-resistant Na(v)1.5 alpha-subunit and they contribute to the total sodium current.

  12. Expansion of transducin subunit gene families in early vertebrate tetraploidizations.

    Science.gov (United States)

    Lagman, David; Sundström, Görel; Ocampo Daza, Daniel; Abalo, Xesús M; Larhammar, Dan

    2012-10-01

    Hundreds of gene families expanded in the early vertebrate tetraploidizations including many gene families in the phototransduction cascade. We have investigated the evolution of the heterotrimeric G-proteins of photoreceptors, the transducins, in relation to these events using both phylogenetic analyses and synteny comparisons. Three alpha subunit genes were identified in amniotes and the coelacanth, GNAT1-3; two of these were identified in amphibians and teleost fish, GNAT1 and GNAT2. Most tetrapods have four beta genes, GNB1-4, and teleosts have additional duplicates. Finally, three gamma genes were identified in mammals, GNGT1, GNG11 and GNGT2. Of these, GNGT1 and GNGT2 were found in the other vertebrates. In frog and zebrafish additional duplicates of GNGT2 were identified. Our analyses show all three transducin families expanded during the early vertebrate tetraploidizations and the beta and gamma families gained additional copies in the teleost-specific genome duplication. This suggests that the tetraploidizations contributed to visual specialisations.

  13. Cloning and sequencing of the casein kinase 2 alpha subunit from Zea mays

    DEFF Research Database (Denmark)

    Dobrowolska, G; Boldyreff, B; Issinger, O G

    1991-01-01

    The nucleotide sequence of the cDNA coding for the alpha subunit of casein kinase 2 of Zea mays has been determined. The cDNA clone contains an open reading frame of 996 nucleotides encoding a polypeptide comprising 332 amino acids. The primary amino acid sequence exhibits 75% identity to the alpha...

  14. Characterization of the alpha and beta subunits of casein kinase 2 by far-UV CD spectroscopy

    DEFF Research Database (Denmark)

    Issinger, O G; Brockel, C; Boldyreff, B;

    1992-01-01

    Although Chou-Fasman calculations of the secondary structure of recombinant casein kinase 2 subunits alpha and beta suggest they have a similar overall conformation, circular dichroism (CD) studies show that substantial differences in the conformation of the two subunits exist. In addition......, no changes in the far-UV CD spectrum of the alpha subunit are observed in the presence of casein or the synthetic decapeptide substrate RRRDDDSDDD. Furthermore, the alpha-helical structure of the alpha subunit (but not the beta subunit) can be increased in the presence of stoichiometric amounts of heparin...

  15. The alpha3 laminin subunit, alpha6beta4 and alpha3beta1 integrin coordinately regulate wound healing in cultured epithelial cells and in the skin

    DEFF Research Database (Denmark)

    Goldfinger, L E; Hopkinson, S B; deHart, G W

    1999-01-01

    Previously, we demonstrated that proteolytic processing within the globular domain of the alpha3 subunit of laminin-5 (LN5) converts LN5 from a cell motility-inducing factor to a protein complex that can trigger the formation of hemidesmosomes, certain cell-matrix attachment sites found in epithe......-inhibiting antibodies, we provide evidence that LN5 and its two integrin receptors (alpha6beta4 and alpha3beta1) appear necessary for wound healing to occur in MCF-10A cell culture wounds. We propose a model for healing of wounded epithelial tissues based on these results....... in epithelial cells. We have prepared a monoclonal antibody (12C4) whose epitope is located toward the carboxy terminus of the globular domain of the alpha3 laminin subunit. This epitope is lost from the alpha3 subunit as a consequence of proteolytic processing. Antibody 12C4 stains throughout the matrix...... the wound site. A similar phenomenon is observed in human skin wounds, since we also detect expression of the unprocessed alpha3 laminin subunit at the leading tip of the sheet of epidermal cells that epithelializes skin wounds in vivo. In addition, using alpha3 laminin subunit and integrin function...

  16. Heterogeneity of the alpha subunit of tubulin and the variability of tubulin within a single organism.

    Science.gov (United States)

    Bibring, T; Baxandall, J; Denslow, S; Walker, B

    1976-05-01

    When tubulins obtained from particular microtubules of the sea urchin (ciliary doublet A tubules, flagellar doublet microtubules, and mitotic microtubules) are analyzed by electrophoresis in a polyacrylamide gel system containing sodium dodecyl sulfate and urea, heterogeneity of the alpha subunit, and differences between the tubulins are revealed. The alpha subunit of tubulin from mitotic apparatus and from A microtubules of ciliary doublets is resolved into two bands, while the alpha subunit of flagellar doublet tubulin gives a single band. The mitotic and ciliary tubulins differ in the mobilities of their two alpha species, or in the relative amounts present, or both. The existence of differences between the tubulins has been confirmed by a preliminary analysis of their cyanogen bromide peptides.

  17. Problems connected with the use of oligonucleotide probes with a high degree of degeneracy. Identification of mRNA and of cDNA clones corresponding to the gene of the. cap alpha. -subunit of Na/sup +/, K/sup +/-ATPase

    Energy Technology Data Exchange (ETDEWEB)

    Petrukhin, K.E.; Grishin, A.V.; Arsenyan, S.G.; Broude, N.E.; Grinkevich, V.A.; Filippova, L.Yu.; Severtsova, I.V.; Modyanov, N.N.

    1986-10-01

    To identify and search for nucleotide sequences containing the structural part of the gene of the ..cap alpha..-subunit of Na/sup +/, K/sup +/-ATPase, 17-membered oligonucleotide probes corresponding to the peptide Lys-Asp-Ala-Phe-Gln-Asn have been synthesized. It has been shown that, with a 64-fold degeneracyd, the 17-membered probe is suitable only for the identification of a specific sequence in mRNA. To search for clones containing cDNA fragments, preliminary fractionation of the probes with the aid of HPLC or the resynthesis of groups of oligonucleotides with a lower degeneracy is necessary.

  18. GABAA receptor subunit gene expression in human prefrontal cortex: comparison of schizophrenics and controls

    Science.gov (United States)

    Akbarian, S.; Huntsman, M. M.; Kim, J. J.; Tafazzoli, A.; Potkin, S. G.; Bunney, W. E. Jr; Jones, E. G.; Bloom, F. E. (Principal Investigator)

    1995-01-01

    The prefrontal cortex of schizophrenics is hypoactive and displays changes related to inhibitory, GABAergic neurons, and GABAergic synapses. These changes include decreased levels of glutamic acid decarboxylase (GAD), the enzyme for GABA synthesis, upregulation of muscimol binding, and downregulation of benzodiazepine binding to GABAA receptors. Studies in the visual cortex of nonhuman primates have demonstrated that gene expression for GAD and for several GABAA receptor subunit polypeptides is under control of neuronal activity, raising the possibility that similar mechanisms in the hypoactive prefrontal cortex of schizophrenics may explain the abnormalities in GAD and in GABAA receptor regulation. In the present study, which is the first of its type on human cerebral cortex, levels of mRNAs for six GABAA receptor subunits (alpha 1, alpha 2, alpha 5, beta 1, beta 2, gamma 2) and their laminar expression patterns were analyzed in the prefrontal cortex of schizophrenics and matched controls, using in situ hybridization histochemistry and densitometry. Three types of laminar expression pattern were observed: mRNAs for the alpha 1, beta 2, and gamma 2 subunits, which are the predominant receptor subunits expressed in the mature cortex, were expressed at comparatively high levels by cells of all six cortical layers, but most intensely by cells in lower layer III and layer IV. mRNAs for the alpha 2, alpha 5, and beta 1 subunits were expressed at lower levels; alpha 2 and beta 1 were expressed predominantly by cells in layers II, III, and IV; alpha 5 was expressed predominantly in layers IV, V, and VI. There were no significant changes in overall mRNA levels for any of the receptor subunits in the prefrontal cortex of schizophrenics, and the laminar expression pattern of all six receptor subunit mRNAs did not differ between schizophrenics and controls. Because gene expression for GABAA receptor subunits is not consistently altered in the prefrontal cortex of

  19. Increased Expression of Laminin Subunit Alpha 1 Chain by dCas9-VP160

    Directory of Open Access Journals (Sweden)

    Arnaud Perrin

    2017-03-01

    Full Text Available Laminin-111 protein complex links the extracellular matrix to integrin α7β1 in sarcolemma, thus replacing in dystrophic muscles links normally insured by the dystrophin complex. Laminin-111 injection in mdx mouse stabilized sarcolemma, restored serum creatine kinase to wild-type levels, and protected muscles from exercised-induced damages. These results suggested that increased laminin-111 is a potential therapy for DMD. Laminin subunit beta 1 and laminin subunit gamma 1 are expressed in adult human muscle, but laminin subunit alpha 1 (LAMA1 gene is expressed only during embryogenesis. We thus developed an alternative method to laminin-111 protein repeated administration by inducing expression of the endogenous mouse Lama1 gene. This was done with the CRSPR/Cas9 system, i.e., by targeting the Lama1 promoter with one or several gRNAs and a dCas9 coupled with the VP160 transcription activation domain. Lama1 mRNA (qRT-PCR and proteins (immunohistochemistry and western blot were not detected in the control C2C12 myoblasts and in control muscles. However, significant expression was observed in cells transfected and in mouse muscles electroporated with plasmids coding for dCas9-VP160 and a gRNA. Larger synergic increases were observed by using two or three gRNAs. The increased Lama1 expression did not modify the expression of the α7 and β1 integrins. Increased expression of Lama1 by the CRISPR/Cas9 system will have to be further investigated by systemic delivery of the CRISPR/Cas9 components to verify whether this could be a treatment for several myopathies.

  20. The thermal structural transition of alpha-crystallin modulates subunit interactions and increases protein solubility.

    Directory of Open Access Journals (Sweden)

    Giuseppe Maulucci

    Full Text Available BACKGROUND: Alpha crystallin is an oligomer composed of two types of subunits, alpha-A and alpha-B crystallin, and is the major constituent of human lens. The temperature induced condensation of alpha-crystallin, the main cause for eye lens opacification (cataract, is a two step-process, a nucleation followed by an aggregation phase, and a protective effect towards the aggregation is exhibited over the alpha crystallin phase transition temperature (Tc = 318.16 K. METHODS/RESULTS: To investigate if a modulation of the subunit interactions over Tc could trigger the protective mechanism towards the aggregation, we followed, by using simultaneously static and dynamic light scattering, the temperature induced condensation of alpha-crystallin. By developing a mathematical model able to uncouple the nucleation and aggregation processes, we find a previously unobserved transition in the nucleation rate constant. Its temperature dependence allows to determine fundamental structural parameters, the chemical potential (Δμ and the interfacial tension (γ of the aggregating phase, that characterize subunit interactions. CONCLUSIONS/GENERAL SIGNIFICANCE: The decrease of both Δμ and γ at Tc, and a relative increase in solubility, reveal a significative decrease in the strenght of alpha-crystallin subunits interactions, which protects from supramolecolar condensation in hypertermic conditions. On the whole, we suggest a general approach able to understand the structural and kinetic mechanisms involved in aggregation-related diseases and in drugs development and testing.

  1. Mutant U5A cells are complemented by an interferon-alpha beta receptor subunit generated by alternative processing of a new member of a cytokine receptor gene cluster.

    OpenAIRE

    Lutfalla, G; Holland, S J; Cinato, E; Monneron, D; Reboul, J.; Rogers, N C; J. M. Smith; Stark, G R; Gardiner, K.; Mogensen, K E

    1995-01-01

    The cellular receptor for the alpha/beta interferons contains at least two components that interact with interferon. The ifnar1 component is well characterized and a putative ifnar2 cDNA has recently been identified. We have cloned the gene for ifnar2 and show that it produces four different transcripts encoding three different polypeptides that are generated by exon skipping, alternative splicing and differential use of polyadenylation sites. One polypeptide is likely to be secreted and two ...

  2. Increased sensitivity of the neuronal nicotinic receptor alpha 2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.

    Science.gov (United States)

    Aridon, Paolo; Marini, Carla; Di Resta, Chiara; Brilli, Elisa; De Fusco, Maurizio; Politi, Fausta; Parrini, Elena; Manfredi, Irene; Pisano, Tiziana; Pruna, Dario; Curia, Giulia; Cianchetti, Carlo; Pasqualetti, Massimo; Becchetti, Andrea; Guerrini, Renzo; Casari, Giorgio

    2006-08-01

    Sleep has traditionally been recognized as a precipitating factor for some forms of epilepsy, although differential diagnosis between some seizure types and parasomnias may be difficult. Autosomal dominant frontal lobe epilepsy is characterized by nocturnal seizures with hyperkinetic automatisms and poorly organized stereotyped movements and has been associated with mutations of the alpha 4 and beta 2 subunits of the neuronal nicotinic acetylcholine receptor. We performed a clinical and molecular genetic study of a large pedigree segregating sleep-related epilepsy in which seizures are associated with fear sensation, tongue movements, and nocturnal wandering, closely resembling nightmares and sleep walking. We identified a new genetic locus for familial sleep-related focal epilepsy on chromosome 8p12.3-8q12.3. By sequencing the positional candidate neuronal cholinergic receptor alpha 2 subunit gene (CHRNA2), we detected a heterozygous missense mutation, I279N, in the first transmembrane domain that is crucial for receptor function. Whole-cell recordings of transiently transfected HEK293 cells expressing either the mutant or the wild-type receptor showed that the new CHRNA2 mutation markedly increases the receptor sensitivity to acetylcholine, therefore indicating that the nicotinic alpha 2 subunit alteration is the underlying cause. CHRNA2 is the third neuronal cholinergic receptor gene to be associated with familial sleep-related epilepsies. Compared with the CHRNA4 and CHRNB2 mutations reported elsewhere, CHRNA2 mutations cause a more complex and finalized ictal behavior.

  3. Mutant U5A cells are complemented by an interferon-alpha beta receptor subunit generated by alternative processing of a new member of a cytokine receptor gene cluster.

    Science.gov (United States)

    Lutfalla, G; Holland, S J; Cinato, E; Monneron, D; Reboul, J; Rogers, N C; Smith, J M; Stark, G R; Gardiner, K; Mogensen, K E

    1995-10-16

    The cellular receptor for the alpha/beta interferons contains at least two components that interact with interferon. The ifnar1 component is well characterized and a putative ifnar2 cDNA has recently been identified. We have cloned the gene for ifnar2 and show that it produces four different transcripts encoding three different polypeptides that are generated by exon skipping, alternative splicing and differential use of polyadenylation sites. One polypeptide is likely to be secreted and two are transmembrane proteins with identical extracellular and transmembrane domains but divergent cytoplasmic tails of 67 and 251 amino acids. A mutant cell line U5A, completely defective in IFN-alpha beta binding and response, has been isolated and characterized. Expression in U5A cells of the polypeptide with the long cytoplasmic domain reconstitutes a functional receptor that restores normal interferon binding, activation of the JAK/STAT signal transduction pathway, interferon-inducible gene expression and antiviral response. The IFNAR2 gene maps at 0.5 kb from the CRFB4 gene, establishing that together IFNAR2, CRFB4, IFNAR1 and AF1 form a cluster of class II cytokine receptor genes on human chromosome 21.

  4. The NH2-terminal php domain of the alpha subunit of the Escherichia coli replicase binds the epsilon proofreading subunit.

    Science.gov (United States)

    Wieczorek, Anna; McHenry, Charles S

    2006-05-05

    The alpha subunit of the replicase of all bacteria contains a php domain, initially identified by its similarity to histidinol phosphatase but of otherwise unknown function (Aravind, L., and Koonin, E. V. (1998) Nucleic Acids Res. 26, 3746-3752). Deletion of 60 residues from the NH2 terminus of the alpha php domain destroys epsilon binding. The minimal 255-residue php domain, estimated by sequence alignment with homolog YcdX, is insufficient for epsilon binding. However, a 320-residue segment including sequences that immediately precede the polymerase domain binds epsilon with the same affinity as the 1160-residue full-length alpha subunit. A subset of mutations of a conserved acidic residue (Asp43 in Escherichia coli alpha) present in the php domain of all bacterial replicases resulted in defects in epsilon binding. Using sequence alignments, we show that the prototypical gram+ Pol C, which contains the polymerase and proofreading activities within the same polypeptide chain, has an epsilon-like sequence inserted in a surface loop near the center of the homologous YcdX protein. These findings suggest that the php domain serves as a platform to enable coordination of proofreading and polymerase activities during chromosomal replication.

  5. Expression of G alpha 16, a G-protein alpha subunit specific for hematopoiesis in acute leukemia.

    Science.gov (United States)

    Pfeilstöcker, M; Karlic, H; Salamon, J; Krömer, E; Mühlberger, H; Pavlova, B; Selim, U; Tüchler, H; Fritsch, G; Kneissl, S; Heinz, R; Pitterman, E; Paukovits, M R

    1996-07-01

    G-proteins are essential in signal transduction pathways. A G-protein alpha subunit termed G alpha 16 was found to be exclusively expressed in hematopoietic cell lines. In cells derived from patients, G alpha 16 expression has been detected in progenitor- and pre-B ALL cells and also in peripheral blood stem cells (PBSC). In this study, we analyzed G alpha 16 expression using a RT-PCR technique by testing elutriated blood cells from normal donors, PBSC from breast cancer patients and bone marrow or peripheral blood cells from acute leukemia patients. Both of two ALL patients and 15/16 AML patients expressed G alpha 16. In elutriation experiments, G alpha 16 expression was found in fractions containing the highest number of precursor cells but was absent in mature T and B cell fractions. In addition, CD34-enriched PBSC were positive for G alpha 16 expression. Further in vitro experiments using the cell line KG1 showed that G alpha 16 expression was not affected by the growth inhibiting hemoregulatory peptide pEEDCK which has a sequence homology present within G alpha 16. Taken together, these data demonstrate that G alpha 16 is expressed in various normal and malignant hematopietic progenitors but not in their differentiated counterparts. G alpha 16 could play a vital role in signal transduction pathways controlling proliferation in early normal and malignant hematopoiesis.

  6. [The response of free alpha-subunit of glycoprotein hormones to LH-RH administration (author's transl)].

    Science.gov (United States)

    Hamamoto, T; Nishimura, R; Ashitaka, Y; Tojo, S

    1982-05-20

    The responses of immunoreactive free alpha-subunit of glycoprotein hormones to LH-RH administration were studied in normal men and women, and in patients with hypergonadotropic hypogonadism, hypogonadotropic hypogonadism, trophoblastic disease and isolated ectopic alpha-subunit producing tumor. In patients with hypergonadotropic hypergonadism, basal levels of serum alpha-subunit were elevated and the responses to LH-RH were also excessive compared to those of normal men and women. Conversely, in hypogonadotropic hypogonadism, basal levels of alpha-subunit were significantly low and its response to LH-RH was barely detectable. The response of alpha-subunit to constant intravenous infusion of LH-RH (1 microgram/kg/h) was studied in 4 normal men. Both LH and alpha-subunit revealed biphasic patterns of elevation. Its releasing pattern suggests the possibility that two pools of gonadotropin are involved in the production and secretion of alpha-subunit. In patients with trophoblastic disease secreting low levels of hCG (18 mIU/ml), the responses of alpha-subunit as well as pituitary gonadotropin to LH-RH were normal. However, in cases of high concentrations of hCG (1000 mIU/ml), the responses of alpha-subunit and gonadotropin were suppressed. After the administration of LH-RH to a patient with an isolated ectopic alpha-subunit producing tumor, the serum concentration of pituitary gonadotropin increased within the normal range, although that of alpha-subunit did not show a significant change. These results suggest that the production of alpha-subunit by tumors may be autonomous in contrast with a regulatory production in the pituitary.

  7. Gene targeting of CK2 catalytic subunits

    Science.gov (United States)

    Lou, David Y.; Toselli, Paul; Landesman-Bollag, Esther; Dominguez, Isabel

    2013-01-01

    Protein kinase CK2 is a highly conserved and ubiquitous serine–threonine kinase. It is a tetrameric enzyme that is made up of two regulatory CK2β subunits and two catalytic subunits, either CK2α/CK2α, CK2α/ CK2α′, or CK2α′/CK2α′. Although the two catalytic subunits diverge in their C termini, their enzymatic activities are similar. To identify the specific function of the two catalytic subunits in development, we have deleted them individually from the mouse genome by homologous recombination. We have previously reported that CK2α′is essential for male germ cell development, and we now demonstrate that CK2α has an essential role in embryogenesis, as mice lacking CK2α die in mid-embryogenesis, with cardiac and neural tube defects. PMID:18594950

  8. Stability of human chorionic gonadotropin and its alpha subunit in human blood.

    Science.gov (United States)

    Rao, C V; Hussa, R O; Carman, F R; Rinke, M L; Cook, C L; Yussman, M A

    1983-05-01

    The stability of human chorionic gonadotropin (hCG) and its alpha-subunit in whole blood, plasma, and serum under a variety of sample handling conditions commonly encountered in clinics, hospital wards, physician's offices, and clinical service laboratories was investigated with the use of radioreceptor assay, radioimmunoassays, as well as hormone integrity determinations. The results clearly demonstrate that hCG and its alpha-subunit are stable in unfrozen whole blood, plasma, and serum for at least 6 days and in frozen plasma and serum samples for at least 6 months. Repeated freezing and thawing of the samples during this period had no effect. Separation of plasma or serum from erythrocytes is not needed for at least 12 hours. Hemolysis in samples resulted in a 20% to 30% decrease in hCG and its alpha-subunit levels, which may be attributable to sample dilution.

  9. Genetic analysis of the Drosophila alphaPS2 integrin subunit reveals discrete adhesive, morphogenetic and sarcomeric functions.

    Science.gov (United States)

    Bloor, J W; Brown, N H

    1998-03-01

    The integrin family of cell surface receptors mediates cell-substrate and cell-to-cell adhesion and transmits intracellular signals. In Drosophila there is good evidence for an adhesive role of integrins, but evidence for integrin signalling has remained elusive. Each integrin is an alphabeta heterodimer, and the Drosophila betaPS subunit forms at least two integrins by association with different alpha subunits: alphaPS1betaPS (PS1) and alphaPS2betaPS (PS2). The complex pattern of PS2 integrin expression includes, but is more extensive than, the sites where PS2 has a known requirement. In order to investigate whether PS2 integrin is required at these additional sites and/or has functions besides mediating adhesion, a comprehensive genetic analysis of inflated, the gene that encodes alphaPS2, was performed. We isolated 35 new inflated alleles, and obtained 10 alleles from our colleagues. The majority of alleles are amorphs (36/45) or hypomorphs (4/45), but five alleles that affect specific developmental processes were identified. Interallelic complementation between these alleles suggests that some may affect distinct functional domains of the alphaPS2 protein, which specify particular interactions that promote adhesion or signalling. One new allele reveals that the PS2 integrin is required for the development of the adult halteres and legs as well as the wing.

  10. Analysis of Maxi-K alpha subunit splice variants in human myometrium

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    Morrison John J

    2004-09-01

    Full Text Available Abstract Background Large-conductance, calcium-activated potassium (Maxi-K channels are implicated in the modulation of human uterine contractions and myometrial Ca2+ homeostasis. However, the regulatory mechanism(s governing the expression of Maxi-K channels with decreased calcium sensitivity at parturition are unclear. The objectives of this study were to investigate mRNA expression of the Maxi-K alpha subunit, and that of its splice variants, in human non-pregnant and pregnant myometrium, prior to and after labour onset, to determine whether altered expression of these splice variants is associated with decreased calcium sensitivity observed at labour onset. Methods Myometrial biopsies were obtained at hysterectomy (non-pregnant, NP, and at Caesarean section, at elective (pregnant not-in-labour, PNL and intrapartum (pregnant in-labour, PL procedures. RNA was extracted from all biopsies and quantitative real-time RT-PCR was used to investigate for possible differential expression of the Maxi-K alpha subunit, and that of its splice variants, between these functionally-distinct myometrial tissue sets. Results RT-PCR analysis identified the presence of a 132 bp and an 87 bp spliced exon of the Maxi-K alpha subunit in all three myometrial tissue sets. Quantitative real-time PCR indicated a decrease in the expression of the Maxi-K alpha subunit with labour onset. While there was no change in the proportion of Maxi-K alpha subunits expressing the 87 bp spliced exon, the proportion of alpha subunits expressing the 132 bp spliced exon was significantly increased with labour onset, compared to both non-pregnant and pregnant not-in-labour tissues. An increased proportion of 132 bp exon-containing alpha subunit variants with labour onset is of interest, as channels expressing this spliced exon have decreased calcium and voltage sensitivities. Conclusions Our findings suggest that decreased Maxi-K alpha subunit mRNA expression in human myometrium at

  11. Characterisation of the tryptophan synthase alpha subunit in maize

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    Gierl Alfons

    2008-04-01

    Full Text Available Abstract Background In bacteria, such as Salmonella typhimurium, tryptophan is synthesized from indole-3-glycerole phosphate (IGP by a tryptophan synthase αββα heterotetramer. Plants have evolved multiple α (TSA and β (TSB homologs, which have probably diverged in biological function and their ability of subunit interaction. There is some evidence for a tryptophan synthase (TS complex in Arabidopsis. On the other hand maize (Zea mays expresses the TSA-homologs BX1 and IGL that efficiently cleave IGP, independent of interaction with TSB. Results In order to clarify, how tryptophan is synthesized in maize, two TSA homologs, hitherto uncharacterized ZmTSA and ZmTSAlike, were functionally analyzed. ZmTSA is localized in plastids, the major site of tryptophan biosynthesis in plants. It catalyzes the tryptophan synthase α-reaction (cleavage of IGP, and forms a tryptophan synthase complex with ZmTSB1 in vitro. The catalytic efficiency of the α-reaction is strongly enhanced upon complex formation. A 160 kD tryptophan synthase complex was partially purified from maize leaves and ZmTSA was identified as native α-subunit of this complex by mass spectrometry. ZmTSAlike, for which no in vitro activity was detected, is localized in the cytosol. ZmTSAlike, BX1, and IGL were not detectable in the native tryptophan synthase complex in leaves. Conclusion It was demonstrated in vivo and in vitro that maize forms a tryptophan synthase complex and ZmTSA functions as α-subunit in this complex.

  12. Uniparental disomy of chromosome 2 resulting in lethal trifunctional protein deficiency due to homozygous alpha-subunit mutations.

    Science.gov (United States)

    Spiekerkoetter, Ute; Eeds, Angela; Yue, Zou; Haines, Jonathan; Strauss, Arnold W; Summar, Marshall

    2002-12-01

    The mitochondrial trifunctional protein (TFP) is an enzyme complex of the fatty acid beta-oxidation cycle composed of an alpha- and a beta-subunit. The two encoding genes are located in the same region on chromosome 2 (2p23). TFP deficiency due to either alpha- or beta-subunit mutations is characterized by mutational and phenotypic heterogeneity with severe, early-onset, cardiac forms and milder, later-onset, myopathic phenotypes. In two unrelated patients with lethal TFP deficiency, we delineated apparently homozygous alpha-subunit mutations that were present in heterozygous form in both mothers, but not in either biological father. We performed a microsatellite repeat analysis of both patients and their parents using seven chromosome 2-specific polymorphic DNA markers and four nonchromosome 2 markers. In both patients, two chromosome 2-specific markers demonstrated maternal isodisomy of chromosome 2. The other five chromosome 2-specific markers were noninformative in each patient. Inheritance of alleles from chromosomes 4, 5, and 7 was consistent with paternity. These results explain the apparently anomalous pattern of transmission. Six of our 12 known TFP-deficient patients with alpha-subunit mutations have disease due to homozygous changes and two of them via the mechanism of uniparental disomy (UPD) (16.7%). For very rare autosomal recessive diseases, UPD may represent a common mechanism. This study emphasizes the need to confirm mutations in parents whenever possible. TFP deficiency is another disorder that has become manifest due to isodisomy of chromosome 2. This information will impact genetic counseling for these families, reducing greatly the 25% risk normally used for recessive disorders.

  13. Mutations in SCN9A, encoding a sodium channel alpha subunit, in patients with primary erythermalgia.

    Science.gov (United States)

    Yang, Y; Wang, Y; Li, S; Xu, Z; Li, H; Ma, L; Fan, J; Bu, D; Liu, B; Fan, Z; Wu, G; Jin, J; Ding, B; Zhu, X; Shen, Y

    2004-03-01

    Primary erythermalgia is a rare autosomal dominant disease characterised by intermittent burning pain with redness and heat in the extremities. A previous study established the linkage of primary erythermalgia to a 7.94 cM interval on chromosome 2q, but the causative gene was not identified. We performed linkage analysis in a Chinese family with primary erythermalgia, and screened the mutations in the two candidate genes, SCN9A and GCA, in the family and a sporadic patient. Linkage analysis yielded a maximum lod score of 2.11 for both markers D2S2370 and D2S2330. Based on critical recombination events in two patients in the family, we further limited the genetic region to 5.98 cM between D2S2370 and D2S2345. We then identified two missense mutations in SCN9A in the family (T2573A) and the sporadic patient (T2543C). Our data suggest that mutations in SCN9A cause primary erythermalgia. SCN9A, encoding a voltage-gated sodium channel alpha subunit predominantly expressed in sensory and sympathetic neurones, may play an important role in nociception and vasomotor regulation.

  14. Molecular cloning and analysis of zebrafish voltage-gated sodium channel beta subunit genes: implications for the evolution of electrical signaling in vertebrates

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    Zhong Tao P

    2007-07-01

    Full Text Available Abstract Background Action potential generation in excitable cells such as myocytes and neurons critically depends on voltage-gated sodium channels. In mammals, sodium channels exist as macromolecular complexes that include a pore-forming alpha subunit and 1 or more modulatory beta subunits. Although alpha subunit genes have been cloned from diverse metazoans including flies, jellyfish, and humans, beta subunits have not previously been identified in any non-mammalian species. To gain further insight into the evolution of electrical signaling in vertebrates, we investigated beta subunit genes in the teleost Danio rerio (zebrafish. Results We identified and cloned single zebrafish gene homologs for beta1-beta3 (zbeta1-zbeta3 and duplicate genes for beta4 (zbeta4.1, zbeta4.2. Sodium channel beta subunit loci are similarly organized in fish and mammalian genomes. Unlike their mammalian counterparts, zbeta1 and zbeta2 subunit genes display extensive alternative splicing. Zebrafish beta subunit genes and their splice variants are differentially-expressed in excitable tissues, indicating tissue-specific regulation of zbeta1-4 expression and splicing. Co-expression of the genes encoding zbeta1 and the zebrafish sodium channel alpha subunit Nav1.5 in Chinese Hamster Ovary cells increased sodium current and altered channel gating, demonstrating functional interactions between zebrafish alpha and beta subunits. Analysis of the synteny and phylogeny of mammalian, teleost, amphibian, and avian beta subunit and related genes indicated that all extant vertebrate beta subunits are orthologous, that beta2/beta4 and beta1/beta3 share common ancestry, and that beta subunits are closely related to other proteins sharing the V-type immunoglobulin domain structure. Vertebrate sodium channel beta subunit genes were not identified in the genomes of invertebrate chordates and are unrelated to known subunits of the para sodium channel in Drosophila. Conclusion The

  15. Structural determinants within residues 180-199 of the rodent. alpha. 5 nicotinic acetylcholine receptor subunit involved in. alpha. -bungarotoxin binding

    Energy Technology Data Exchange (ETDEWEB)

    McLane, K.E.; Xiadong Wu; Conti-Tronconi, B.M. (Univ. of Minnesota, St. Paul (United States))

    1991-11-05

    Synthetic peptides corresponding to sequence segments of the nicotinic acetylcholine receptor (nAChR) {alpha} subunits have been used to identify regions that contribute to formation of the binding sites for cholinergic ligands. The authors have previously defined {alpha}-bungarotoxin ({alpha}-BTX) binding sequences between residues 180 and 199 of a putative rat neuronal nAChR {alpha} subunit, designated {alpha}5, and between residues 181 and 200 of the chick neuronal {alpha}7 and {alpha}8 subunits. These sequences are relatively divergent compared with the Torpedo and muscle nAChR {alpha}1 {alpha}-BTX binding sites, which indicates a serious limitation of predicting functional domains of proteins based on homology in general. Given the highly divergent nature of the {alpha}5 sequence, they were interested in determining the critical amino acid residues for {alpha}-BTX binding. In the present study, the effects of single amino acid substitutions of Gly or Ala for each residue of the rat {alpha}(180-199) sequence were tested, using a competition assay, in which peptides compete for {sup 125}I-{alpha}-BTX binding with native Torpedo nAChR. These results indicate that a disulfide bridge between the vicinal cysteines at positions 191 and 192 of the {alpha}5 sequence is not an absolute requirement for {alpha}-BTX binding activity.

  16. Carbohydrate composition of the alpha-subunit of human choriogonadotropin (hCG alpha) and the free alpha molecules produced in pregnancy: most free alpha and some combined hCG alpha molecules are fucosylated.

    Science.gov (United States)

    Blithe, D L

    1990-06-01

    The carbohydrate compositions of pregnancy-derived hCG alpha (dissociated from intact hCG) and free alpha-subunit were analyzed using a combination of chemical analysis, lectin affinity chromatography, and glycosidase sensitivity. For direct compositional analysis, parallel samples were hydrolyzed in trifluoroacetic acid and analyzed for sialic acid and neutral sugars without prior derivatization. Separation of the monosaccharides was achieved by HPLC on a Dionex CarboPac column eluted at high pH, and the resolved monosaccharides were quantified by pulsed amperometric detection. The amounts of sugar that were found relative to peptide indicated the presence of two N-linked oligosaccharides per molecule on both hCG alpha and free alpha. Free alpha contained 2.5-fold higher amounts of sialic acid and galactose as well as a higher amount of N-acetylglucosamine than did hCG alpha. Free alpha also contained a 6-fold higher amount of fucose than did hCG alpha (1.2 vs. 0.2 residues of fucose/molecule). Serial fractionation of intact hCG alpha and free alpha molecules by lectin affinity chromatography indicated that virtually all of the hCG alpha-subunits contained at least one Concanavalin-A (Con-A)-binding site, whereas as many as 32% of the free alpha molecules could not bind to Con-A. Chromatography on Lens culinaris (Lch) resulted in 12% binding of hCG alpha and approximately 72% binding of free alpha (80-85% of the Con-A-bound free alpha and 47-48% of the Con-A-nonbound free alpha bound to Lch). Endoglycosidase-H (endo-H) treatment of hCG alpha released a portion of the oligosaccharides. The endo-H-released material appeared to be a monoantennary hybrid based on DEAE-binding properties and carbohydrate composition. In contrast to hCG alpha, free alpha was completely resistant to endo-H treatment. Incubation of endo-H-resistant hCG alpha with glycopeptidase-A resulted in the release of two components, which could be separated into monoantennary and biantennary

  17. Canine chondrodysplasia caused by a truncating mutation in collagen-binding integrin alpha subunit 10.

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    Kaisa Kyöstilä

    Full Text Available The skeletal dysplasias are disorders of the bone and cartilage tissues. Similarly to humans, several dog breeds have been reported to suffer from different types of genetic skeletal disorders. We have studied the molecular genetic background of an autosomal recessive chondrodysplasia that affects the Norwegian Elkhound and Karelian Bear Dog breeds. The affected dogs suffer from disproportionate short stature dwarfism of varying severity. Through a genome-wide approach, we mapped the chondrodysplasia locus to a 2-Mb region on canine chromosome 17 in nine affected and nine healthy Elkhounds (praw = 7.42×10(-6, pgenome-wide = 0.013. The associated locus contained a promising candidate gene, cartilage specific integrin alpha 10 (ITGA10, and mutation screening of its 30 exons revealed a nonsense mutation in exon 16 (c.2083C>T; p.Arg695* that segregated fully with the disease in both breeds (p = 2.5×10(-23. A 24% mutation carrier frequency was indicated in NEs and an 8% frequency in KBDs. The ITGA10 gene product, integrin receptor α10-subunit combines into a collagen-binding α10β1 integrin receptor, which is expressed in cartilage chondrocytes and mediates chondrocyte-matrix interactions during endochondral ossification. As a consequence of the nonsense mutation, the α10-protein was not detected in the affected cartilage tissue. The canine phenotype highlights the importance of the α10β1 integrin in bone growth, and the large animal model could be utilized to further delineate its specific functions. Finally, this study revealed a candidate gene for human chondrodysplasias and enabled the development of a genetic test for breeding purposes to eradicate the disease from the two dog breeds.

  18. Change in location and processing of inhibin alpha-subunit precursors during sexual maturation of the Djungarian hamster testis.

    Science.gov (United States)

    Tuohimaa, P; Bläuer, M; Bergmann, M; Aumüller, G

    1993-02-01

    Immunohistochemical location and immunoblot of inhibin alpha-subunit peptides were analyzed in the testis of the Djungarian hamster from days 0-31 of postnatal development using a specific antibody. An intense immunoreaction was observed in the centrally located T1 prespermatogonia at day 0. The staining intensity decreased gradually in the spermatogonia when they make contact with the basal lamina at days 8-10. At days 13 and 15 there is no staining. Thereafter the immunoreactivity in Sertoli cells as well as in A spermatogonia gradually increased, being highest in sexually mature animals. The intensity of alpha-subunit staining in the seminiferous tubules was stage specific, being strongest at stages III and IV. Immunoblot analysis of testis homogenates with the anti-INH alpha 1-32 antibody showed several bands: 88K, 80K, and 43K in immature hamster testis (0-, 2-, 6-, 8-, or 10-day-old). In the adult hamster (31-day-old) 88K, 80K, 28K, and 20K bands were seen, but no 43K band. Dimeric inhibin was not detected. The 43-44K band most likely corresponds to the pro-alpha N alpha C, the 28K band to intermediate forms between alpha N alpha C and alpha C (alpha I alpha C), and the 20K band to mature alpha-subunit (alpha C). The shift from the immature pattern to mature occurs at about 20 days of age. Freezing of the samples was deleterious to alpha C, since it could be detected only in freshly homogenized samples. The results suggest that prespermatogonia produce predominantly monomeric alpha-subunit precursor pro-alpha N alpha C, whereas the mature Sertoli cells as well as A spermatogonia contain mainly monomeric alpha I alpha C. The alpha-inhibin precursors may act as auto-/paracrine regulators of spermatogenesis. Our results suggest that different alpha-subunit precursors, pro-alpha N alpha C and alpha I alpha C, might be involved in the differentiation and maintenance of spermatogenesis, respectively. The posttranslational processing of alpha-subunit precursors

  19. Stat2 binding to the interferon-alpha receptor 2 subunit is not required for interferon-alpha signaling.

    Science.gov (United States)

    Nguyen, Vinh-Phúc; Saleh, Abu Z M; Arch, Allison E; Yan, Hai; Piazza, Flavia; Kim, John; Krolewski, John J

    2002-03-22

    The interferon-alpha (IFNalpha) receptor consists of two subunits, the IFNalpha receptor 1 (IFNaR1) and 2 (IFNaR2) chains. Following ligand binding, IFNaR1 is phosphorylated on tyrosine 466, and this site recruits Stat2 via its SH2 domain. In contrast, IFNaR2 binds Stat2 constitutively. In this study we have characterized the Stat2-IFNaR2 interaction and examined its role in IFNalpha signaling. Stat2 binds the major IFNaR2 protein but not a variant containing a shorter cytoplasmic domain. The interaction does not require a STAT SH2 domain. Both tyrosine-phosphorylated and non-phosphorylated Stat2 bind IFNaR2 in vitro; however, relatively little phosphorylated Stat2 associates with IFNaR2 in vivo. In vitro binding assays defined IFNaR2 residues 418-444 as the minimal interaction domain and site-specific mutation of conserved acidic residues within this domain disrupted in vitro and in vivo binding. An IFNaR2 construct carrying these mutations was either (i) overexpressed in 293T cells or (ii) used to complement IFNaR2-deficient U5A cells. Unexpectedly, the activity of an IFNalpha-dependent reporter gene was not reduced but, instead, was enhanced up to 2-fold. This suggests that this particular IFNaR2-Stat2 interaction is not required for IFNalpha signaling, but might act to negatively inhibit signaling. Finally, a doubly truncated recombinant fragment of Stat2, spanning residues 136-702, associated with IFNaR2 in vitro, indicating that the interaction with IFNaR2 is direct and occurs in a central region of Stat2 marked by a hydrophobic core.

  20. Unexpected high digestion rate of cooked starch by the Ct-Maltase-Glucoamylase small intestine mucosal alpha-glucosidase subunit

    Science.gov (United States)

    For starch digestion to glucose, two luminal alpha-amylases and four gut mucosal alpha-glucosidase subunits are employed. The aim of this research was to investigate, for the first time, direct digestion capability of individual mucosal alpha-glucosidases on cooked (gelatinized) starch. Gelatinized ...

  1. Mapping of the Mouse Actin Capping Protein Beta Subunit Gene

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    Cooper John A

    2000-07-01

    Full Text Available Abstract Background Capping protein (CP, a heterodimer of α and β subunits, is found in all eukaryotes. CP binds to the barbed ends of actin filaments in vitro and controls actin assembly and cell motility in vivo. Vertebrates have three isoforms of CPβ produced by alternatively splicing from one gene; lower organisms have one gene and one isoform. Results We isolated genomic clones corresponding to the β subunit of mouse CP and identified its chromosomal location by interspecies backcross mapping. Conclusions The CPβ gene (Cappb1 mapped to Chromosome 4 between Cdc42 and D4Mit312. Three mouse mutations, snubnose, curly tail, and cribriform degeneration, map in the vicinity of the β gene.

  2. The Alpha Catalytic Subunit of Protein Kinase CK2 Is Required for Mouse Embryonic Development▿

    Science.gov (United States)

    Lou, David Y.; Dominguez, Isabel; Toselli, Paul; Landesman-Bollag, Esther; O'Brien, Conor; Seldin, David C.

    2008-01-01

    Protein kinase CK2 (formerly casein kinase II) is a highly conserved and ubiquitous serine/threonine kinase that is composed of two catalytic subunits (CK2α and/or CK2α′) and two CK2β regulatory subunits. CK2 has many substrates in cells, and key roles in yeast cell physiology have been uncovered by introducing subunit mutations. Gene-targeting experiments have demonstrated that in mice, the CK2β gene is required for early embryonic development, while the CK2α′ subunit appears to be essential only for normal spermatogenesis. We have used homologous recombination to disrupt the CK2α gene in the mouse germ line. Embryos lacking CK2α have a marked reduction in CK2 activity in spite of the presence of the CK2α′ subunit. CK2α−/− embryos die in mid-gestation, with abnormalities including open neural tubes and reductions in the branchial arches. Defects in the formation of the heart lead to hydrops fetalis and are likely the cause of embryonic lethality. Thus, CK2α appears to play an essential and uncompensated role in mammalian development. PMID:17954558

  3. Synthetic. cap alpha. subunit peptide 125-147 of human nicotinic acetylcholine receptor induces antibodies to native receptor

    Energy Technology Data Exchange (ETDEWEB)

    McCormick, D.J.; Griesmann, G.E.; Huang, Z.; Lennon, V.A.

    1986-03-05

    A synthetic peptide corresponding to residues 125-147 of the Torpedo acetylcholine receptor (AChR) ..cap alpha.. subunit proved to be a major antigenic region of the AChR. Rats inoculated with 50 ..mu..g of peptide (T ..cap alpha.. 125-147) developed T cell immunity and antibodies to native AChR and signs of experimental autoimmune myasthenia gravis. They report the synthesis and preliminary testing of a disulfide-looped peptide comprising residues 125-147 of the human AChR ..cap alpha.. subunit. Peptide H ..cap alpha.. 125-147 differs from T ..cap alpha.. 125-147 at residues 139 (Glu for Gln) and 143 (Ser for Thr). In immunoprecipitation assays, antibodies to Torpedo AChR bound /sup 125/I-labelled H..cap alpha.. 125-147 antibody bound H..cap alpha.. 125-147, but monoclonal antibodies to an immunodominant region of native AChR bound neither H..cap alpha.. 125-147 nor T ..cap alpha.. 125-147. Rats immunized with H ..cap alpha.. 125-147 produced anti-mammalian muscle AChR antibodies that induced modulation of AChRs from cultured human myotubes. Thus, region 125-147 of the human AChR ..cap alpha.. subunit is extracellular in muscle, and is both antigenic and immunogenic. It remains to be determined whether or not autoantibodies to this region may in part cause the weakness or myasthenia gravis in man.

  4. Characterization of the alpha and beta subunits of casein kinase 2 by far-UV CD spectroscopy

    DEFF Research Database (Denmark)

    Issinger, O G; Brockel, C; Boldyreff, B

    1992-01-01

    , comparison of the far-UV CD spectrum of reconstituted CK-2 with the spectra of the subunits indicates that conformational changes occur in the backbone region upon association. Such changes may explain the increased enzyme activity of the holoenzyme relative to that of the alpha subunit itself. In contrast......, presumably by its binding to the polylysine stretch at amino acid positions 74-77. Heat denaturation experiments (25-90 degrees C) support the notion that heparin may provide a local protective function. A similar but much larger effect was also observed in the presence of the beta subunit only, which...... supports previous suggestions of a protective function for this subunit. These results indicate that the protection provided by the beta subunit and the increased enzyme activity of the holoenzyme may arise, in part, from a stabilization of the conformation of the enzyme complex and an increase in alpha...

  5. Functional expression of the GABAA receptor alpha2 and alpha3 subunits at synapses between intercalated medial paracapsular neurons of mouse amygdala

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    Raffaella eGeracitano

    2012-05-01

    Full Text Available In the amygdala, GABAergic neurons in the intercalated medial paracapsular cluster (Imp have been suggested to play a key role in fear learning and extinction. These neurons project to the central amygdaloid nucleus and to other areas within and outside the amygdala. In addition, they give rise to local collaterals that innervate other neurons in the Imp. Several drugs, including benzodiazepines, are allosteric modulators of GABA-A receptors. Benzodiazepines have both anxiolytic and sedative actions, which are mediated through GABA-A receptors containing alpha2/3 and alpha1 subunits, respectively. To establish whether alpha1 or alpha2/3 subunits are expressed at Imp cell synapses, we used paired recordings of anatomically-identified Imp neurons and high resolution immunocytochemistry in the mouse. We observed that a selective alpha3 subunit agonist, TP003 (100 nM, significantly increased the decay time constant of the unitary IPSCs. A similar effect was also induced by zolpidem (10 microM or by diazepam (1 microM. In contrast, lower doses of zolpidem (0.1-1 microM did not significantly alter the kinetics of the unitary IPSCs. Accordingly, immunocytochemical experiments established that the alpha2 and alpha3, but not the alpha1 subunits of the GABA-A receptors, were present at Imp cell synapses of the mouse amygdala. These results define, for the first time, some of the functional GABA-A receptor subunits expressed at synapses of Imp cells. The data also provide an additional rationale to prompt the search of GABA-A receptor alpha3 selective ligands as improved anxiolytic drugs.

  6. Molecular cloning of pituitary glycoprotein alpha-subunit and follicle stimulating hormone and chorionic gonadotropin beta-subunits from New World squirrel monkey and owl monkey.

    Science.gov (United States)

    Scammell, Jonathan G; Funkhouser, Jane D; Moyer, Felricia S; Gibson, Susan V; Willis, Donna L

    2008-02-01

    The goal of this study was to characterize the gonadotropins expressed in pituitary glands of the New World squirrel monkey (Saimiri sp.) and owl monkey (Aotus sp.). The various subunits were amplified from total RNA from squirrel monkey and owl monkey pituitary glands by reverse transcription-polymerase chain reaction and the deduced amino acid sequences compared to those of other species. Mature squirrel monkey and owl monkey glycoprotein hormone alpha-polypeptides (96 amino acids in length) were determined to be 80% homologous to the human sequence. The sequences of mature beta subunits of follicle stimulating hormone (FSHbeta) from squirrel monkey and owl monkey (111 amino acids in length) are 92% homologous to human FSHbeta. New World primate glycoprotein hormone alpha-polypeptides and FSHbeta subunits showed conservation of all cysteine residues and consensus N-linked glycosylation sites. Attempts to amplify the beta-subunit of luteinizing hormone from squirrel monkey and owl monkey pituitary glands were unsuccessful. Rather, the beta-subunit of chorionic gonadotropin (CG) was amplified from pituitaries of both New World primates. Squirrel monkey and owl monkey CGbeta are 143 and 144 amino acids in length and 77% homologous with human CGbeta. The greatest divergence is in the C terminus, where all four sites for O-linked glycosylation in human CGbeta, responsible for delayed metabolic clearance, are predicted to be absent in New World primate CGbetas. It is likely that CG secreted from pituitary of New World primates exhibits a relatively short half-life compared to human CG.

  7. Immunogenicity of P/Q-type calcium channel in small cell lung cancer: investigation of alpha1 subunit polyglutamine expansion.

    Science.gov (United States)

    Black, J L; Nelson, T R; Snow, K; Lennon, V A

    1999-12-01

    The ectopic expression of neuronal P/Q-type voltage-gated calcium channels in small cell lung carcinoma (SCLC) is thought to induce antisynaptic autoimmunity in the paraneoplastic Lambert-Eaton myasthenic syndrome. The gene CACNL1A4, encoding the principal (alpha1A) subunit of this calcium channel, is mutated in several inherited neurological disorders. One of these disorders (spinocerebellar ataxia, type 6, or SCA-6) involves the expansion of a trinucleotide (CAG) repeat unit. We hypothesized that a somatic CAG repeat instability of this gene in neoplastic cells might generate a non-self epitope capable of initiating autoimmunity to P/Q-type calcium channels. We therefore analyzed the CACNL1A4 gene in SCLC lines established from metastases derived from seven individual patients (four associated with Lambert-Eaton myasthenic syndrome, one associated with myasthenia gravis, and two not associated with neurological autoimmunity). We compared their CAG repeat numbers (determined by polymerase chain reaction (PCR) amplification followed by separation of products on a 6% polyacrylamide/8M urea gel) to published norms and to DNA from a patient with SCA-6. The number of CAG repeats in SCLC DNA fell within a normal range whether or not the neoplasm was complicated by neurological autoimmunity. Therefore, it is unlikely that somatically unstable CAG repeat units in the gene encoding the P/Q-type voltage-gated calcium channel account for this tumor protein's immunogenicity in the Lambert-Eaton myasthenic syndrome.

  8. Domain mapping of the retinal cyclic GMP phosphodiesterase gamma-subunit. Function of the domains encoded by the three exons of the gamma-subunit gene.

    Science.gov (United States)

    Takemoto, D J; Hurt, D; Oppert, B; Cunnick, J

    1992-02-01

    Retinal rod-outer-segment phosphodiesterase (PDE) is a heterotetramer consisting of two similar, but not identical, catalytic subunits (alpha and beta) and two identical inhibitory subunits (gamma 2). Previously, we have reported that the site of PDE alpha/beta interaction with PDE gamma is located within residues 54-87 [Cunnick, Hurt, Oppert, Sakamoto & Takemoto (1990) Biochem. J. 271, 721-727]. The site for PDE gamma interaction with transducin alpha (T alpha) was found to encompass residues 24-45 of PDE gamma [Morrison, Cunnick, Oppert & Takemoto (1989) J. Biol. Chem. 264, 11671-11681]. In order to identify binding sites and other functional domains of PDE gamma, the three peptides which are encoded by the three exons of the PDE gamma gene were synthesized chemically. These exons encode for residues 1-49, 50-62 and 63-87 of bovine PDE gamma [Piriev, Purishko, Khramtsov & Lipkin (1990) Dokl. Akad. Nauk. SSSR 315, 229-230]. The peptide encompassing residues 63-87 was inhibitory in a PDE assay, whereas peptides 1-49 and 50-62 had no effect. However, both peptides 1-49 and 63-87 bound to PDE alpha/beta in a solid-phase binding assay. Only peptide 1-49 bound to T alpha.GTP[S] (GTP[S] is guanosine 5'-[gamma-thio]triphosphate). These data confirm that the inhibitory region of PDE gamma is encoded by exon 3 (residues 63-87), whereas a separate binding site for PDE alpha/beta and for T alpha.GTP[S] is encoded by exon 1 (residues 1-49). To study further the structure-function relationship of PDE gamma, this entire protein and two mutants were chemically synthesized. One mutant (-CT) lacked residues 78-87, whereas another replaced tyrosine-84 with glycine (TYR-84). Whereas the synthetic PDE gamma inhibited PDE alpha/beta catalytic activity, the -CT and TVR-84 mutants did not. All three synthetic proteins bound to both PDE alpha/beta and and T alpha.GTP[S]. These data confirm the presence of an alternative binding site on PDE gamma and demonstrate the importance of tyrosine

  9. Multi-colony stimulating activity of interleukin 5 (IL-5) on hematopoietic progenitors from transgenic mice that express IL-5 receptor alpha subunit constitutively

    OpenAIRE

    1995-01-01

    The interleukin 3 (IL-3), IL-5, and granulocyte/macrophage colony- stimulating factor receptors consist of a cytokine-specific alpha subunit and the common beta subunit. Whereas IL-3 stimulates various lineages of hematopoietic cells, including multipotential progenitors, IL-5 acts mainly as an eosinophil lineage-specific factor. To investigate whether the lineage specificity of IL-5 is due to restricted expression of the IL-5 receptor alpha subunit (IL-5R alpha), we generated transgenic mice...

  10. Stoichiometry of expressed alpha(4)beta(2)delta gamma-aminobutyric acid type A receptors depends on the ratio of subunit cDNA transfected.

    Science.gov (United States)

    Wagoner, Kelly R; Czajkowski, Cynthia

    2010-05-07

    The gamma-aminobutyric acid type A receptor (GABA(A)R) is the target of many depressants, including benzodiazepines, anesthetics, and alcohol. Although the highly prevalent alphabetagamma GABA(A)R subtype mediates the majority of fast synaptic inhibition in the brain, receptors containing delta subunits also play a key role, mediating tonic inhibition and the actions of endogenous neurosteroids and alcohol. However, the fundamental properties of delta-containing GABA(A)Rs, such as subunit stoichiometry, are not well established. To determine subunit stoichiometry of expressed delta-containing GABA(A)Rs, we inserted the alpha-bungarotoxin binding site tag in the alpha(4), beta(2), and delta subunit N termini. An enhanced green fluorescent protein tag was also inserted into the beta(2) subunit to shift its molecular weight, allowing us to separate subunits using SDS-PAGE. Tagged alpha(4)beta(2)delta GABA(A)Rs were expressed in HEK293T cells using various ratios of subunit cDNA, and receptor subunit stoichiometry was determined by quantitating fluorescent alpha-bungarotoxin bound to each subunit on Western blots of surface immunopurified tagged GABA(A)Rs. The results demonstrate that the subunit stoichiometry of alpha(4)beta(2)delta GABA(A)Rs is regulated by the ratio of subunit cDNAs transfected. Increasing the ratio of delta subunit cDNA transfected increased delta subunit incorporation into surface receptors with a concomitant decrease in beta(2) subunit incorporation. Because receptor subunit stoichiometry can directly influence GABA(A)R pharmacological and functional properties, considering how the transfection protocols used affect subunit stoichiometry is essential when studying heterologously expressed alpha(4)beta(2)delta GABA(A)Rs. Successful bungarotoxin binding site tagging of GABA(A)R subunits is a novel tool with which to accurately quantitate subunit stoichiometry and will be useful for monitoring GABA(A)R trafficking in live cells.

  11. Altered alpha subunits in phenylalanyl-tRNA synthetases from p-fluorophenylalanine-resistant strains of Escherichis coli.

    Science.gov (United States)

    Hennecke, H; Böck, A

    1975-07-01

    Three different phenylalanyl-tRNA synthetases have been purified to near homogeneity, one from a wild-type strain of Escherichia coli and the others from two independently isolated p-fluorophenyalanine-resistant strains. The mutant enzymes were not able to use p-fluorophenylalanine as a substrate for activation and attachment to tRNA. They proved to be indistinguishable from the wild-type enzyme by several electrophoretic and immunological criteria. The alpha and beta subunits of all three enzymes have been prepared by a method described in this paper. The isolated subunits per se did not reveal any significant enzyme activity, but combined they were able to form active phenylalanyl tRNA synthetase after a defined reconstitution process. Mixed reconstitution experiments between wild-type and mutant subunits indicate that the mutant alpha subunit is responsible for p-fluorophenylalanine resistance and therefore seems to carry the phenylalanine-binding site or to participate in its formation.

  12. Archaeal translation initiation revisited: the initiation factor 2 and eukaryotic initiation factor 2B alpha-beta-delta subunit families

    Science.gov (United States)

    Kyrpides, N. C.; Woese, C. R.

    1998-01-01

    As the amount of available sequence data increases, it becomes apparent that our understanding of translation initiation is far from comprehensive and that prior conclusions concerning the origin of the process are wrong. Contrary to earlier conclusions, key elements of translation initiation originated at the Universal Ancestor stage, for homologous counterparts exist in all three primary taxa. Herein, we explore the evolutionary relationships among the components of bacterial initiation factor 2 (IF-2) and eukaryotic IF-2 (eIF-2)/eIF-2B, i.e., the initiation factors involved in introducing the initiator tRNA into the translation mechanism and performing the first step in the peptide chain elongation cycle. All Archaea appear to posses a fully functional eIF-2 molecule, but they lack the associated GTP recycling function, eIF-2B (a five-subunit molecule). Yet, the Archaea do posses members of the gene family defined by the (related) eIF-2B subunits alpha, beta, and delta, although these are not specifically related to any of the three eukaryotic subunits. Additional members of this family also occur in some (but by no means all) Bacteria and even in some eukaryotes. The functional significance of the other members of this family is unclear and requires experimental resolution. Similarly, the occurrence of bacterial IF-2-like molecules in all Archaea and in some eukaryotes further complicates the picture of translation initiation. Overall, these data lend further support to the suggestion that the rudiments of translation initiation were present at the Universal Ancestor stage.

  13. The crystal structure of the complex of Zea mays alpha subunit with a fragment of human beta subunit provides the clue to the architecture of protein kinase CK2 holoenzyme

    DEFF Research Database (Denmark)

    Battistutta, R; Sarno, S; De Moliner, E

    2000-01-01

    The crystal structure of a complex between the catalytic alpha subunit of Zea mays CK2 and a 23-mer peptide corresponding the C-terminal sequence 181-203 of the human CK2 regulatory beta subunit has been determined at 3.16-A resolution. The complex, composed of two alpha chains and two peptides...

  14. Expression of five acetylcholine receptor subunit genes in Brugia malayi adult worms.

    Science.gov (United States)

    Li, Ben-Wen; Rush, Amy C; Weil, Gary J

    2015-12-01

    Acetylcholine receptors (AChRs) are required for body movement in parasitic nematodes and are targets of "classical" anthelmintic drugs such as levamisole and pyrantel and of newer drugs such as tribendimidine and derquantel. While neurotransmission explains the effects of these drugs on nematode movement, their effects on parasite reproduction are unexplained. The levamisole AChR type (L-AChRs) in Caenorhabditis elegans is comprised of five subunits: Cel-UNC-29, Cel-UNC-38, Cel-UNC-63, Cel-LEV-1 and Cel-LEV-8. The genome of the filarial parasite Brugia malayi contains nine AChRs subunits including orthologues of Cel-unc-29, Cel-unc-38, and Cel-unc-63. We performed in situ hybridization with RNA probes to localize the expression of five AChR genes (Bm1_35890-Bma-unc-29, Bm1_20330-Bma-unc-38, Bm1_38195-Bma-unc-63, Bm1_48815-Bma-acr-26 and Bm1_40515-Bma-acr-12) in B. malayi adult worms. Four of these genes had similar expression patterns with signals in body muscle, developing embryos, spermatogonia, uterine wall adjacent to stretched microfilariae, wall of V as deferens, and lateral cord. Three L-AChR subunit genes (Bma-unc-29, Bma-unc-38 and Bma-unc-63) were expressed in body muscle, which is a known target of levamisole. Bma-acr-12 was co-expressed with these levamisole subunit genes in muscle, and this suggests that its protein product may form receptors with other alpha subunits. Bma-acr-26 was expressed in male muscle but not in female muscle. Strong expression signals of these genes in early embryos and gametes in uterus and testis suggest that AChRs may have a role in nervous system development of embryogenesis and spermatogenesis. This would be consistent with embryotoxic effects of drugs that target these receptors in filarial worms. Our data show that the expression of these receptor genes is tightly regulated with regard to localization in adult worms and developmental stage in embryos and gametes. These results may help to explain the broad effects of

  15. Expression of five acetylcholine receptor subunit genes in Brugia malayi adult worms

    Directory of Open Access Journals (Sweden)

    Ben-Wen Li

    2015-12-01

    Full Text Available Acetylcholine receptors (AChRs are required for body movement in parasitic nematodes and are targets of “classical” anthelmintic drugs such as levamisole and pyrantel and of newer drugs such as tribendimidine and derquantel. While neurotransmission explains the effects of these drugs on nematode movement, their effects on parasite reproduction are unexplained. The levamisole AChR type (L-AChRs in Caenorhabditis elegans is comprised of five subunits: Cel-UNC-29, Cel-UNC-38, Cel-UNC-63, Cel-LEV-1 and Cel-LEV-8. The genome of the filarial parasite Brugia malayi contains nine AChRs subunits including orthologues of Cel-unc-29, Cel-unc-38, and Cel-unc-63. We performed in situ hybridization with RNA probes to localize the expression of five AChR genes (Bm1_35890-Bma-unc-29, Bm1_20330-Bma-unc-38, Bm1_38195-Bma-unc-63, Bm1_48815-Bma-acr-26 and Bm1_40515-Bma-acr-12 in B. malayi adult worms. Four of these genes had similar expression patterns with signals in body muscle, developing embryos, spermatogonia, uterine wall adjacent to stretched microfilariae, wall of Vas deferens, and lateral cord. Three L-AChR subunit genes (Bma-unc-29, Bma-unc-38 and Bma-unc-63 were expressed in body muscle, which is a known target of levamisole. Bma-acr-12 was co-expressed with these levamisole subunit genes in muscle, and this suggests that its protein product may form receptors with other alpha subunits. Bma-acr-26 was expressed in male muscle but not in female muscle. Strong expression signals of these genes in early embryos and gametes in uterus and testis suggest that AChRs may have a role in nervous system development of embryogenesis and spermatogenesis. This would be consistent with embryotoxic effects of drugs that target these receptors in filarial worms. Our data show that the expression of these receptor genes is tightly regulated with regard to localization in adult worms and developmental stage in embryos and gametes. These results may help to explain the

  16. The helical domain of a G protein alpha subunit is a regulator of its effector.

    Science.gov (United States)

    Liu, W; Northup, J K

    1998-10-27

    The alpha subunit (Galpha) of heterotrimeric G proteins is a major determinant of signaling selectivity. The Galpha structure essentially comprises a GTPase "Ras-like" domain (RasD) and a unique alpha-helical domain (HD). We used the vertebrate phototransduction model to test for potential functions of HD and found that the HD of the retinal transducin Galpha (Galphat) and the closely related gustducin (Galphag), but not Galphai1, Galphas, or Galphaq synergistically enhance guanosine 5'-gamma[-thio]triphosphate bound Galphat (GalphatGTPgammaS) activation of bovine rod cGMP phosphodiesterase (PDE). In addition, both HDt and HDg, but not HDi1, HDs, or HDq attenuate the trypsin-activated PDE. GalphatGDP and HDt attenuation of trypsin-activated PDE saturate with similar affinities and to an identical 38% of initial activity. These data suggest that interaction of intact Galphat with the PDE catalytic core may be caused by the HD moiety, and they indicate an independent site(s) for the HD moiety of Galphat within the PDE catalytic core in addition to the sites for the inhibitory Pgamma subunits. The HD moiety of GalphatGDP is an attenuator of the activated catalytic core, whereas in the presence of activated GalphatGTPgammaS the independently expressed HDt is a potent synergist. Rhodopsin catalysis of Galphat activation enhances the PDE activation produced by subsaturating levels of Galphat, suggesting a HD-moiety synergism from a transient conformation of Galphat. These results establish HD-selective regulations of vertebrate retinal PDE, and they provide evidence demonstrating that the HD is a modulatory domain. We suggest that the HD works in concert with the RasD, enhancing the efficiency of G protein signaling.

  17. Reduction and Methyl Transfer Kinetics of the Alpha Subunit from Acetyl-Coenzyme A Synthase

    Energy Technology Data Exchange (ETDEWEB)

    Xiangshi Tan; Christopher Sewell; Qingwu Yang; Paul A. Lindahl

    2003-01-15

    OAK-B135 Stopped-flow was used to evaluate the methylation and reduction kinetics of the isolated alpha subunit of acetyl-Coenzyme A synthase from Moorella thermoacetica. This catalytically active subunit contains a novel Ni-X-Fe4S4 cluster and a putative unidentified n =2 redox site called D. The D-site must be reduced for a methyl group to transfer from a corrinoid-iron-sulfur protein, a key step in the catalytic synthesis of acetyl-CoA. The Fe4S4 component of this cluster is also redox active, raising the possibility that it is the D-site or a portion thereof. Results presented demonstrate that the D-site reduces far faster than the Fe4S4 component, effectively eliminating this possibility. Rather, this component may alter catalytically important properties of the Ni center. The D-site is reduced through a pathway that probably does not involve the Fe4S4 component of this active-site cluster.

  18. Genetic Construction of Truncated and Chimeric Metalloproteins Derived from the Alpha Subunit of Acetyl-CoA Synthase from Clostridium thermoaceticum

    Energy Technology Data Exchange (ETDEWEB)

    Huay-Keng Loke; Xiangshi Tan; Paul A. Lindahl

    2002-06-28

    In this study, a genetics-based method is used to truncate acetyl-coenzyme A synthase from Clostridium thermoaceticum (ACS), an alpha2beta2 tetrameric 310 kda bifunctional enzyme. ACS catalyzes the reversible reduction of CO2 to CO and the synthesis of acetyl-CoA from CO (or CO2 in the presence of low-potential reductants), CoA, and a methyl group bound to a corrinoid-iron sulfur protein (CoFeSP). ACS contains 7 metal-sulfur clusters of 4 different types called A, B, C, and D. The B, C, and D clusters are located in the 72 kda beta subunit while the A-cluster, a Ni-X-Fe4S4 cluster that serves as the active site for acetyl-CoA synthase activity, is located in the 82 kda alpha subunit. The extent to which the essential properties of the cluster, including catalytic, redox, spectroscopic, and substrate-binding properties, were retained as ACS was progressively truncated was determined. Acetyl-CoA synthase catalytic activity remained when the entire alpha subunit was removed, as long as CO, rather than CO2 and a low-potential reductant, was used as a substrate. Truncating an {approx} 30 kda region from the N-terminus of the alpha subunit yielded a 49 kda protein that lacked catalytic activity but exhibited A-cluster-like spectroscopic, redox, and CO binding properties. Further truncation afforded a 23 kda protein that lacked recognizable A-cluster properties except for UV-vis spectra typical of [Fe4S4]2+ clusters. Two chimeric proteins were constructed by fusing the gene encoding a ferredoxin from Chromatium vinosum to genes encoding the 49 kda and 82 kda fragments of the alpha subunit. The chimeric proteins exhibited EPR signals that were not the simple sum of the signals from the separate proteins, suggesting magnetic interactions between clusters. This study highlights the potential for using genetics to simplify the study of complex multi-centered metalloenzymes and to generate new complex metalloenzymes with interesting properties.

  19. Genetic Construction of Truncated and Chimeric Metalloproteins Derived from the Alpha Subunit of Acetyl-CoA Synthase from Clostridium thermoaceticum

    Energy Technology Data Exchange (ETDEWEB)

    Huay-Keng Loke; Xiangshi Tan; Paul A. Lindahl

    2002-06-28

    In this study, a genetics-based method is used to truncate acetyl-coenzyme A synthase from Clostridium thermoaceticum (ACS), an alpha2beta2 tetrameric 310 kda bifunctional enzyme. ACS catalyzes the reversible reduction of CO2 to CO and the synthesis of acetyl-CoA from CO (or CO2 in the presence of low-potential reductants), CoA, and a methyl group bound to a corrinoid-iron sulfur protein (CoFeSP). ACS contains 7 metal-sulfur clusters of 4 different types called A, B, C, and D. The B, C, and D clusters are located in the 72 kda beta subunit while the A-cluster, a Ni-X-Fe4S4 cluster that serves as the active site for acetyl-CoA synthase activity, is located in the 82 kda alpha subunit. The extent to which the essential properties of the cluster, including catalytic, redox, spectroscopic, and substrate-binding properties, were retained as ACS was progressively truncated was determined. Acetyl-CoA synthase catalytic activity remained when the entire alpha subunit was removed, as long as CO, rather than CO2 and a low-potential reductant, was used as a substrate. Truncating an {approx} 30 kda region from the N-terminus of the alpha subunit yielded a 49 kda protein that lacked catalytic activity but exhibited A-cluster-like spectroscopic, redox, and CO binding properties. Further truncation afforded a 23 kda protein that lacked recognizable A-cluster properties except for UV-vis spectra typical of [Fe4S4]2+ clusters. Two chimeric proteins were constructed by fusing the gene encoding a ferredoxin from Chromatium vinosum to genes encoding the 49 kda and 82 kda fragments of the alpha subunit. The chimeric proteins exhibited EPR signals that were not the simple sum of the signals from the separate proteins, suggesting magnetic interactions between clusters. This study highlights the potential for using genetics to simplify the study of complex multi-centered metalloenzymes and to generate new complex metalloenzymes with interesting properties.

  20. Allotopic Expression of a Gene Encoding FLAG Tagged-subunit 8 of Yeast Mitochondrial ATP Synthase

    Directory of Open Access Journals (Sweden)

    I MADE ARTIKA

    2006-03-01

    Full Text Available Subunit 8 of yeast mitochondrial ATP synthase is a polypeptide of 48 amino acids encoded by the mitochondrial ATP8 gene. A nuclear version of subunit 8 gene has been designed to encode FLAG tagged-subunit 8 fused with a mitochondrial signal peptide. The gene has been cloned into a yeast expression vector and then expressed in a yeast strain lacking endogenous subunit 8. Results showed that the gene was successfully expressed and the synthesized FLAG tagged-subunit 8 protein was imported into mitochondria. Following import, the FLAG tagged-subunit 8 protein assembled into functional mitochondrial ATP synthase complex. Furthermore, the subunit 8 protein could be detected using anti-FLAG tag monoclonal antibody.

  1. NMR analysis of G-protein betagamma subunit complexes reveals a dynamic G(alpha)-Gbetagamma subunit interface and multiple protein recognition modes.

    Science.gov (United States)

    Smrcka, Alan V; Kichik, Nessim; Tarragó, Teresa; Burroughs, Michael; Park, Min-Sun; Itoga, Nathan K; Stern, Harry A; Willardson, Barry M; Giralt, Ernest

    2010-01-12

    G-protein betagamma (Gbetagamma) subunits interact with a wide range of molecular partners including: G(alpha) subunits, effectors, peptides, and small molecule inhibitors. The molecular mechanisms underlying the ability to accommodate this wide range of structurally distinct binding partners are not well understood. To uncover the role of protein flexibility and alterations in protein conformation in molecular recognition by Gbetagamma, a method for site-specific (15)N-labeling of Gbeta-Trp residue backbone and indole amines in insect cells was developed. Transverse Relaxation Optimized Spectroscopy-Heteronuclear Single-Quantum Coherence Nuclear Magnetic Resonance (TROSY-HSQC NMR) analysis of (15)N-Trp Gbetagamma identified well-dispersed signals for the individual Trp residue side chain and amide positions. Surprisingly, a wide range of signal intensities was observed in the spectrum, likely representing a range of backbone and side chain mobilities. The signal for GbetaW99 indole was very intense, suggesting a high level of mobility on the protein surface and molecular dynamics simulations indicate that GbetaW99 is highly mobile on the nanosecond timescale in comparison with other Gbeta tryptophans. Binding of peptides and phosducin dramatically altered the mobility of GbetaW99 and GbetaW332 in the binding site and the chemical shifts at sites distant from the direct binding surface in distinct ways. In contrast, binding of G(alpha)(i1)-GDP to Gbetagamma had relatively little effect on the spectrum and, most surprisingly, did not significantly alter Trp mobility at the subunit interface. This suggests the inactive heterotrimer in solution adopts a conformation with an open subunit interface a large percentage of the time. Overall, these data show that Gbetagamma subunits explore a range of conformations that can be exploited during molecular recognition by diverse binding partners.

  2. Identification of a common amino acid polymorphism in the p85alpha regulatory subunit of phosphatidylinositol 3-kinase

    DEFF Research Database (Denmark)

    Hansen, Torben; Andersen, C B; Echwald, Søren Morgenthaler

    1997-01-01

    in a phenotype study. Single-strand conformational polymorphism and heteroduplex analysis of the coding region of the regulatory p85alpha subunit in cDNA isolated from human muscle tissue from 70 insulin-resistant NIDDM patients and 12 control subjects revealed three silent polymorphisms and a missense mutation...

  3. GROWTH HORMONE-, ALPHA-SUBUNIT AND THYROTROPIN-COSECRETING PITUITARY-ADENOMA IN FAMILIAL SETTING OF PITUITARY-TUMOR

    NARCIS (Netherlands)

    LINKS, TP; MONKELBAAN, JF; DULLAART, RPF; VANHAEFTEN, TW

    1993-01-01

    A patient with acromegaly and hyperthyroidism due to a growth hormone-, thyrotrophin- and alpha-subunit-secreting pituitary adenoma is described. His deceased father had suffered from a pituitary tumour, and was likely to have had acromegaly as well. Plasma growth hormone and insulin-like growth fac

  4. Cloning, chromosomal localization, and functional expression of the alpha 1 subunit of the L-type voltage-dependent calcium channel from normal human heart

    NARCIS (Netherlands)

    Schultz, D; Mikala, G; Yatani, A; Engle, D B; Iles, D E; Segers, B; Sinke, R J; Weghuis, D O; Klöckner, U; Wakamori, M

    1993-01-01

    A unique structural variant of the cardiac L-type voltage-dependent calcium channel alpha 1 subunit cDNA was isolated from libraries derived from normal human heart mRNA. The deduced amino acid sequence shows significant homology to other calcium channel alpha 1 subunits. However, differences from t

  5. The crystal structure of the complex of Zea mays alpha subunit with a fragment of human beta subunit provides the clue to the architecture of protein kinase CK2 holoenzyme

    DEFF Research Database (Denmark)

    Battistutta, R; Sarno, S; De Moliner, E

    2000-01-01

    The crystal structure of a complex between the catalytic alpha subunit of Zea mays CK2 and a 23-mer peptide corresponding the C-terminal sequence 181-203 of the human CK2 regulatory beta subunit has been determined at 3.16-A resolution. The complex, composed of two alpha chains and two peptides......, presents a molecular twofold axis, with each peptide interacting with both alpha chains. In the derived model of the holoenzyme, the regulatory subunits are positioned on the opposite side with respect to the opening of the catalytic sites, that remain accessible to substrates and cosubstrates. The beta...... subunit can influence the catalytic activity both directly and by promoting the formation of the alpha2 dimer, in which each alpha chain interacts with the active site of the other. Furthermore, the two active sites are so close in space that they can simultaneously bind and phosphorylate two...

  6. Phenotypic consequences of deletion of the {gamma}{sub 3}, {alpha}{sub 5}, or {beta}{sub 3} subunit of the type A {gamma}-aminobutyric acid receptor in mice

    Energy Technology Data Exchange (ETDEWEB)

    Culia, C.T.; Stubbs, L.J.; Montgomery, C.S.; Russell, L.B.; Rinchik, E.M. [Oak Ridge National Lab., TN (United States)

    1994-03-29

    Three genes (Gabrg3, Gabra5, and Gabrb3) encoding the {gamma}{sub 3}, {alpha}{sub 5}, and {beta}{sub 3} subunits of the type A {gamma}-aminobutyric acid receptor, respectively, are known to map near the pink-eyed dilution (p) locus in mouse chromosome 7. This region shares homology with a segment of human chromosome 15 that is implicated in Angelman syndrome, an inherited neurobehavioral disorder. By mapping Gabrg3-Gabra5-Gabrb3-telomere. Like Gabrb3, neither the Gabra5 nor Gabrg3 gene is functionally imprinted in adult mouse brain. Mice deleted for all three subunits die at birth with a cleft palate, although there are rare survivors ({approximately} 5%) that do not have a cleft palate but do exhibit a neurological abnormality characterized by tremor, jerky gait, and runtiness. The authors have previously suggested that deficiency of the {beta}{sub 3} subunit may be responsible for the clefting defect. Most notably, however, in this report they describe mice carrying two overlapping, complementing p deletions that fail to express the {gamma}{sub 3} transcript, as well as mice from another line that express neither the {gamma}{sub 3} nor {alpha}{sub 5} transcripts. Surprisingly, mice from both of these lines are phenotypically normal and do not exhibit any of the neurological symptoms characteristic of the rare survivors that are deleted for all three ({gamma}{sub 3}, {alpha}{sub 5}, and {beta}{sub 3}) subunits. These mice therefore provide a whole-organism type A {gamma}-aminobutyric-acid receptor background that is devoid of any receptor subtypes that normally contain the {gamma}{sub 3} and/or {alpha}{sub 5} subunits. The absence of an overt neurological phenotype in mice lacking the {gamma}{sub 3} and/or {alpha}{sub 5} subunits also suggests that mutations in these genes are unlikely to provide useful animal models for Angelman syndrome in humans.

  7. The AMP-activated protein kinase alpha2 catalytic subunit controls whole-body insulin sensitivity.

    Science.gov (United States)

    Viollet, Benoit; Andreelli, Fabrizio; Jørgensen, Sebastian B; Perrin, Christophe; Geloen, Alain; Flamez, Daisy; Mu, James; Lenzner, Claudia; Baud, Olivier; Bennoun, Myriam; Gomas, Emmanuel; Nicolas, Gaël; Wojtaszewski, Jørgen F P; Kahn, Axel; Carling, David; Schuit, Frans C; Birnbaum, Morris J; Richter, Erik A; Burcelin, Rémy; Vaulont, Sophie

    2003-01-01

    AMP-activated protein kinase (AMPK) is viewed as a fuel sensor for glucose and lipid metabolism. To better understand the physiological role of AMPK, we generated a knockout mouse model in which the AMPKalpha2 catalytic subunit gene was inactivated. AMPKalpha2(-/-) mice presented high glucose levels in the fed period and during an oral glucose challenge associated with low insulin plasma levels. However, in isolated AMPKalpha2(-/-) pancreatic islets, glucose- and L-arginine-stimulated insulin secretion were not affected. AMPKalpha2(-/-) mice have reduced insulin-stimulated whole-body glucose utilization and muscle glycogen synthesis rates assessed in vivo by the hyperinsulinemic euglycemic clamp technique. Surprisingly, both parameters were not altered in mice expressing a dominant-negative mutant of AMPK in skeletal muscle. Furthermore, glucose transport was normal in incubated isolated AMPKalpha2(-/-) muscles. These data indicate that AMPKalpha2 in tissues other than skeletal muscles regulates insulin action. Concordantly, we found an increased daily urinary catecholamine excretion in AMPKalpha2(-/-) mice, suggesting altered function of the autonomic nervous system that could explain both the impaired insulin secretion and insulin sensitivity observed in vivo. Therefore, extramuscular AMPKalpha2 catalytic subunit is important for whole-body insulin action in vivo, probably through modulation of sympathetic nervous activity.

  8. Control of yeast mating signal transduction by a mammalian. beta. sub 2 -adrenergic receptor and G sub s. alpha. subunit

    Energy Technology Data Exchange (ETDEWEB)

    King, K.; Caron, M.G.; Lefkowitz, R.J. (Duke Univ. Medical Center, Durham, NC (USA)); Dohlman, H.G.; Thorner, J. (Univ. of California, Berkeley (USA))

    1990-10-05

    To facilitate functional and mechanistic studies of receptor-G protein interactions by expression of the human {beta}{sub 2}-adrenergic receptor (h{beta}-AR) has been expressed in Saccharomyces cerevisiae. This was achieved by placing a modified h{beta}-AR gene under control of the galactose-inducible GAL1 promoter. After induction by galactose, functional h{beta}-AR was expressed at a concentration several hundred times as great as that found in any human tissue. As determined from competitive ligand binding experiments, h{beta}-AR expressed in yeast displayed characteristic affinities, specificity, and stereoselectivity. Partial activation of the yeast pheromone response pathway by {beta}-adrenergic receptor agonists was achieved in cells coexpressing h{beta}-AR and a mammalian G protein (G{sub s}) {alpha} subunit - demonstrating that these components can couple to each other and to downstream effectors when expressed in yeast. This in vivo reconstitution system provides a new approach for examining ligand binding and G protein coupling to cell surface receptors.

  9. A Trp474Cys mutation in the alpha-subunit of beta-hexosaminidase causes a subacute encephalopathic form of G{sub M2} gangliosidosis, type 1

    Energy Technology Data Exchange (ETDEWEB)

    Petroulakis, E.; Cao, Z.; Salo, T. [Univ. of Manitoba, Winnipeg (Canada)] [and others

    1994-09-01

    Mutations in the HEXA gene that encodes the {alpha}-subunit of the heterodimeric lysosomal enzyme {beta}-hexosaminidase A, or Hex A ({alpha}{beta}), cause G{sub M2} gangliosidosis, type 1. The infantile form (Tay-Sachs disease) results when there is no residual Hex A activity, while less severe and more variable clinical phenotypes result when residual Hex A activity is present. A non-Jewish male who presented with an acute psychotic episode at age 16 was diagnosed with a subacute encephalopathic form of G{sub M2} gangliosidosis. At age 19, chronic psychosis with intermittent acute exacerbations remains the most disabling symptom in this patient and his affected brother although both exhibit some ataxia and moderately severe dysarthria. We have found a 4 bp insertion (+TATC 1278) associated with infantile Tay-Sachs disease on one allele; no previously identified mutation was found on the second allele. SSCP analysis detected a shift in exon 13 and sequencing revealed a G1422C mutation in the second allele that results in a Trp474Cys substitution. The presence of the mutation was confirmed by the loss of HaeIII and ScrFI sites in exon 13 PCR products from the subjects and their father. The mutation was introduced into the {alpha}-subunit cDNA and Hex S ({alpha}{alpha}) and Hex A ({alpha}{beta}) were transiently expressed in monkey COS-7 cells. The Trp474Cys mutant protein had approximately 5% and 12% of wild-type Hex S and Hex A activity, respectively. Western blot analysis revealed a small amount of residual mature {alpha}-subunit and a normal level of precursor protein. We conclude that the Trp474Cys mutation is the cause of the Hex A deficiency associated with a subacute (juvenile-onset) phenotype in this patient. Like other mutations in exon 13 of HEXA, it appears to affect intracellular processing. Studies of the defect in intracellular processing are in progress.

  10. Familial Congenital Hypothyroidism Caused by Abnormal and Bioinactive TSH due to Mutations in the beta-Subunit Gene.

    Science.gov (United States)

    Medeiros-Neto, G; de Lacerda, L; Wondisford, F E

    1997-01-01

    Hereditary TSH deficiency is a rare autosomal recessive disease described in inbred Japanese families and in Greek and Brazilian kindreds. The TSH-beta-subunit gene has been shown to be the site of mutations that will give rise to truncated proteins that cannot dimerize with the alpha subunit or, alternatively, will produce a mutated TSH that is present in the circulation of the affected patients, but it is biologically inactive. Characteristically, the patients with TSH-beta-subunit-defects are born with congenital hypothyroidism, with very low levels of serum thyroid hormones and serum thyroglobulin and, paradoxically, with serum TSH levels that are consistently undetectable or at very low levels. Goiter is not present at birth, but the low radioactive thyroid uptake will increase after bovine TSH stimulation. Other pituitary hormones responses to provocative tests are normal. The subunit levels are at high concentration and are significantly increased following TRH stimulation. In two kindreds, molecular biological studies have indicated mutations in two different sites of exon 2, generating a peptide that would not dimerize with subunits to synthesize TSH molecules. In one kindred, a truncated TSH-beta protein was translated that generated a biologically inactive but detectable serum TSH molecule. (c) 1997, Elsevier Science Inc. (Trends Endocrinol Metab 1997;8:15-20).

  11. Activity of nAChRs containing alpha9 subunits modulates synapse stabilization via bidirectional signaling programs.

    Science.gov (United States)

    Murthy, Vidya; Taranda, Julián; Elgoyhen, A Belén; Vetter, Douglas E

    2009-12-01

    Although the synaptogenic program for cholinergic synapses of the neuromuscular junction is well known, little is known of the identity or dynamic expression patterns of proteins involved in non-neuromuscular nicotinic synapse development. We have previously demonstrated abnormal presynaptic terminal morphology following loss of nicotinic acetylcholine receptor (nAChR) alpha9 subunit expression in adult cochleae. However, the molecular mechanisms underlying these changes have remained obscure. To better understand synapse formation and the role of cholinergic activity in the synaptogenesis of the inner ear, we exploit the nAChR alpha9 subunit null mouse. In this mouse, functional acetylcholine (ACh) neurotransmission to the hair cells is completely silenced. Results demonstrate a premature, effusive innervation to the synaptic pole of the outer hair cells in alpha9 null mice coinciding with delayed expression of cell adhesion proteins during the period of effusive contact. Collapse of the ectopic innervation coincides with an age-related hyperexpression pattern in the null mice. In addition, we document changes in expression of presynaptic vesicle recycling/trafficking machinery in the alpha9 null mice that suggests a bidirectional information flow between the target of the neural innervation (the hair cells) and the presynaptic terminal that is modified by hair cell nAChR activity. Loss of nAChR activity may alter transcriptional activity, as CREB binding protein expression is decreased coincident with the increased expression of N-Cadherin in the adult alpha9 null mice. Finally, by using mice expressing the nondesensitizing alpha9 L9'T point mutant nAChR subunit, we show that increased nAChR activity drives synaptic hyperinnervation.

  12. Cloning and preliminary functional analysis of ATPase alpha subunit gene promoter from Dunaliella salina%杜氏盐藻叶绿体ATP合酶α亚单位基因启动子的克隆及初步功能分析

    Institute of Scientific and Technical Information of China (English)

    谷辉辉; 冯书营; 潘卫东; 李杰; 薛乐勋

    2011-01-01

    采用DraⅠ,EcoRⅤ,PvuⅡ,ScaⅠ,SmaⅠ和StuⅠ六种内切酶消化杜氏盐藻(Dunaliella salina)叶绿体基因组DNA,与相应DNA接头连接,构建成无载体连接的盐藻叶绿体Genome Walker DNA文库。利用长距离PCR(long distance-polymerase chain reaction,LD-PCR)技术从该文库中克隆得到ATP合酶α亚单位(atpA)基因上游序列1347bp。启动子特征分析显示该序列具有一般启动子的保守序列特征,根据这些特征设计引物,扩增4个5’端系列缺失的启动子片段,并用绿色荧光蛋白基因作为报告基因,构建启动子5’端系列缺失重组质粒,以期鉴定不同启动子片段的驱动报告基因转录的活性。基因枪转化结果显示,启动子长度约1000bp的重组载体转化盐藻后,其转化株中有黄绿色的盐藻细胞出现。说明克隆的序列具有启动子活性,能驱动绿色荧光蛋白基因在杜氏盐藻中有效表达,为建立盐藻叶绿体转化系统奠定了工作基础。%To clone and identify the function of the promoter of the ATPase alpha subunit (atpA) gene from Dunaliella salina, a chloroplast GenomeWalker DNA Library from D. salina was constructed, from which the 1 347 bp upstream fragment of atpA gene was cloned by long distance-polymerase chain reaction (LD-PCR). According to the positions of the different promoter elements predicted by bioinformatics tools, 5'-deleted series primers were designed to amplify different promoter fragments. Series 5'-deleted expression vector containing the GFP gene was constructed and then transformed to cells of D. salina by particle bombardment. The transformed cells with p 1000 recombinant vector produced green fluorescence, but not in other transformation groups, suggesting that the cloned region had the activity of the promoter and may drive the effective expression of the GFP gene in D.salina. Our results have layed a foundation for the chloroplast

  13. daf-31 encodes the catalytic subunit of N alpha-acetyltransferase that regulates Caenorhabditis elegans development, metabolism and adult lifespan.

    Science.gov (United States)

    Chen, Di; Zhang, Jiuli; Minnerly, Justin; Kaul, Tiffany; Riddle, Donald L; Jia, Kailiang

    2014-10-01

    The Caenorhabditis elegans dauer larva is a facultative state of diapause. Mutations affecting dauer signal transduction and morphogenesis have been reported. Of these, most that result in constitutive formation of dauer larvae are temperature-sensitive (ts). The daf-31 mutant was isolated in genetic screens looking for novel and underrepresented classes of mutants that form dauer and dauer-like larvae non-conditionally. Dauer-like larvae are arrested in development and have some, but not all, of the normal dauer characteristics. We show here that daf-31 mutants form dauer-like larvae under starvation conditions but are sensitive to SDS treatment. Moreover, metabolism is shifted to fat accumulation in daf-31 mutants. We cloned the daf-31 gene and it encodes an ortholog of the arrest-defective-1 protein (ARD1) that is the catalytic subunit of the major N alpha-acetyltransferase (NatA). A daf-31 promoter::GFP reporter gene indicates daf-31 is expressed in multiple tissues including neurons, pharynx, intestine and hypodermal cells. Interestingly, overexpression of daf-31 enhances the longevity phenotype of daf-2 mutants, which is dependent on the forkhead transcription factor (FOXO) DAF-16. We demonstrate that overexpression of daf-31 stimulates the transcriptional activity of DAF-16 without influencing its subcellular localization. These data reveal an essential role of NatA in controlling C. elegans life history and also a novel interaction between ARD1 and FOXO transcription factors, which may contribute to understanding the function of ARD1 in mammals.

  14. Interaction of retinal guanylate cyclase with the alpha subunit of transducin: potential role in transducin localization.

    Science.gov (United States)

    Rosenzweig, Derek H; Nair, K Saidas; Levay, Konstantin; Peshenko, Igor V; Crabb, John W; Dizhoor, Alexander M; Slepak, Vladlen Z

    2009-02-01

    Vertebrate phototransduction is mediated by cGMP, which is generated by retGC (retinal guanylate cyclase) and degraded by cGMP phosphodiesterase. Light stimulates cGMP hydrolysis via the G-protein transducin, which directly binds to and activates phosphodiesterase. Bright light also causes relocalization of transducin from the OS (outer segments) of the rod cells to the inner compartments. In the present study, we show experimental evidence for a previously unknown interaction between G(alphat) (the transducin alpha subunit) and retGC. G(alphat) co-immunoprecipitates with retGC from the retina or from co-transfected COS-7 cells. The retGC-G(alphat) complex is also present in cones. The interaction also occurs in mice lacking RGS9 (regulator of G-protein signalling 9), a protein previously shown to associate with both G(alphat) and retGC. The G(alphat)-retGC interaction is mediated primarily by the kinase homology domain of retGC, which binds GDP-bound G(alphat) stronger than the GTP[S] (GTPgammaS; guanosine 5'-[gamma-thio]triphosphate) form. Neither G(alphat) nor G(betagamma) affect retGC-mediated cGMP synthesis, regardless of the presence of GCAP (guanylate cyclase activating protein) and Ca2+. The rate of light-dependent transducin redistribution from the OS to the inner segments is markedly accelerated in the retGC-1-knockout mice, while the migration of transducin to the OS after the onset of darkness is delayed. Supplementation of permeabilized photoreceptors with cGMP does not affect transducin translocation. Taken together, these results suggest that the protein-protein interaction between G(alphat) and retGC represents a novel mechanism regulating light-dependent translocation of transducin in rod photoreceptors.

  15. Bilaterian phylogeny based on analyses of a region of the sodium-potassium ATPase beta-subunit gene.

    Science.gov (United States)

    Anderson, Frank E; Córdoba, Alonso J; Thollesson, Mikael

    2004-03-01

    Molecular investigations of deep-level relationships within and among the animal phyla have been hampered by a lack of slowly evolving genes that are amenable to study by molecular systematists. To provide new data for use in deep-level metazoan phylogenetic studies, primers were developed to amplify a 1.3-kb region of the alpha subunit of the nuclear-encoded sodium-potassium ATPase gene from 31 bilaterians representing several phyla. Maximum parsimony, maximum likelihood, and Bayesian analyses of these sequences (combined with ATPase sequences for 23 taxa downloaded from GenBank) yield congruent trees that corroborate recent findings based on analyses of other data sets (e.g., the 18S ribosomal RNA gene). The ATPase-based trees support monophyly for several clades (including Lophotrochozoa, a form of Ecdysozoa, Vertebrata, Mollusca, Bivalvia, Gastropoda, Arachnida, Hexapoda, Coleoptera, and Diptera) but do not support monophyly for Deuterostomia, Arthropoda, or Nemertea. Parametric bootstrapping tests reject monophyly for Arthropoda and Nemertea but are unable to reject deuterostome monophyly. Overall, the sodium-potassium ATPase alpha-subunit gene appears to be useful for deep-level studies of metazoan phylogeny.

  16. Activating mutations of the Gs alpha-gene in nonfunctioning pituitary tumors.

    Science.gov (United States)

    Tordjman, K; Stern, N; Ouaknine, G; Yossiphov, Y; Razon, N; Nordenskjöld, M; Friedman, E

    1993-09-01

    The majority of pituitary tumors are of monoclonal origin; however, the molecular basis for their formation is poorly understood. Somatic mutations in the alpha-subunit of the GTP-binding protein, Gs alpha (gsp oncogene) have been found in about one third of GH-secreting tumors. Mutations in another alpha-subunit of a GTP-binding protein, Gi2 alpha (gip mutations) have been described in other endocrine tumors. In this study, we examined 21 nonfunctioning pituitary tumors and 4 macroprolactinomas for gsp mutations and 27 nonfunctioning tumors and 4 macroprolactinomas for gip mutations. Using the polymerase chain reaction and denaturing gradient gel electrophoresis, 2 nonfunctioning pituitary tumors displayed migration abnormalities when the Gs alpha-gene was analyzed. Sequence analysis of these abnormally migrating polymerase chain reaction products revealed two previously known gsp mutations: arginine at codon 201 altered to cysteine, and glutamine at codon 227 changed to leucine. No gip mutations could be demonstrated. These findings emphasize the monoclonal origin of nonfunctioning pituitary tumors and suggest that cAMP may play a role in tumorigenesis of nonfunctioning pituitary tumors.

  17. Spectral and Temporal Properties of the Alpha and Beta Subunits and (alpha Beta) Monomer Isolated from Nostoc SP. Using Picosecond Laser Spectroscopy.

    Science.gov (United States)

    Dagen, Aaron J.

    1985-12-01

    The fluorescence decay profiles, relative quantum yield and transmission of the (alpha), (beta) and ((alpha)(beta)) complexes from phycoerythrin isolated from the photosynthetic antenna system of Nostoc sp. and measured by single picosecond laser spectroscopic techniques is studied. The fluorescence decay profiles of all three complexes are found to be intensity independent for the intensity range investigated ((TURN)4 x 10('13) to (TURN)4 x 10('15) photons-cm('-2) per pulse). The apparent decrease in the relative quantum yield of all three complexes as intensity increases is offset by a corresponding increase in the relative transmission. This evidence, along with the intensity independent fluorescence kinetics, suggests that exciton annihilation is absent in these complexes. The decay profiles are fit to models assuming energy transfer amongst fluorescing chromophores. The intraprotein transfer rate is found to be 100 ps in the (alpha) subunit, 666 ps in the (beta) subunit. Constraining these rates to be identical in the monomer results in explaining the monomer kinetics by an increase in the nonradiative rate of the f(,(beta)) chromophore, an apparent result of aggregation effects.

  18. Reconstitution of F1-ATPase activity from Escherichia coli subunits alpha, beta and subunit gamma tagged with six histidine residues at the C-terminus.

    Science.gov (United States)

    Ekuni, A; Watanabe, H; Kuroda, N; Sawada, K; Murakami, H; Kanazawa, H

    1998-05-01

    An engineered gamma subunit of Escherichia coli F1-ATPase with extra 14 and 20 amino acid residues at the N- and C-termini (His-tag gamma), respectively, was overproduced in E. coli and purified. Six histidines are included in the C-terminal extension. The reconstituted F1 containing alpha, beta, and His-tagged gamma exhibited sixty percent of the wild-type ATPase activity. The reconstituted alphabeta His-tag gamma complex was subjected to affinity chromatography with nickel-nitrilotriacetic acid (Ni-NTA) agarose resin. ATPase activity was eluted specifically with imidazole. These results implied that the tag sequence protruded to the surface of the complex and did not seriously impair the activity. The reconstituted alphabeta His-tag gamma complex, even after its binding to the resin, exhibited ATPase activity suggesting that the gamma subunit, when fixed to a solid phase, may rotate the alphabeta complex. This system may provide a new approach for analysis of the rotation mechanisms in F1-ATPase.

  19. Significant prognostic values of nuclear genes encoding mitochondrial complex I subunits in tumor patients.

    Science.gov (United States)

    Li, L D; Sun, H F; Bai, Y; Gao, S P; Jiang, H L; Jin, W

    2016-01-01

    In cancer biology, it remains still open question concerning the oncogenic versus oncosuppressor behavior of metabolic genes, which includes those encoding mitochondrial complex I (CI) subunits. The prognostic value of nuclear genome mRNAs expression of CI subunits is to be evaluated in the tumor patients. We used the Kaplan Meier plotter database, the cBio Cancer Genomics Portal, and the Oncomine in which gene expression data and survival information were from thousands of tumor patients to assess the relevance of nuclear genome mRNAs level of CI subunits to patients' survival, as well as their alterations in gene and expression level in tumors. We presented that the relative expression level of overwhelming majority of the nuclear genes of CI subunits with survival significance (overall survival, relapse free survival, progression free survival, distant metastasis free survival, post progression survival, and first progression), had consistent effects for patients in each type of four tumors separately, including breast cancer, ovarian cancer, lung cancer, and gastric cancer. However, in gene level, frequent cumulative or individual alteration of these genes could not significantly affect patients' survival and the overexpression of the individual gene was not ubiquitous in tumors versus normal tissues. Given that reprogrammed energy metabolism was viewed as an emerging hallmark of tumor, thus tumor patients' survival might potentially to be evaluated by certain threshold for overall expression of CI subunits. Comprehensive understanding of the nuclear genome encoded CI subunits may have guiding significance for the diagnosis and prognosis in tumor patients.

  20. Involvement of proteasome alpha-subunit PSMA7 in hepatitis C virus internal ribosome entry site-mediated translation.

    Science.gov (United States)

    Krüger, M; Beger, C; Welch, P J; Barber, J R; Manns, M P; Wong-Staal, F

    2001-12-01

    Ribozymes are small catalytic RNA molecules that can be engineered to enzymatically cleave RNA transcripts in a sequence-specific fashion and thereby inhibit expression and function of the corresponding gene product. With their simple structures and site-specific cleavage activity, they have been exploited as potential therapeutic agents in a variety of human disorders, including hepatitis C virus (HCV) infection. We have designed a hairpin ribozyme (Rz3'X) targeting the HCV minus-strand replication intermediate at position 40 within the 3'X tail. Surprisingly, Rz3'X was found to induce ganciclovir (GCV)-resistant colonies in a bicistronic cellular reporter system with HCV internal ribosome entry site (IRES)-dependent translation of herpes simplex virus thymidine kinase (TK). Rz3'X-transduced GCV-resistant HeLa reporter cells showed substantially reduced IRES-mediated HCV core protein translation compared with control vector-transduced cells. Since these reporter systems do not contain the HCV 3'X tail sequences, the results indicate that Rz3'X probably exerted an inhibitory effect on HCV IRES activity fortuitously through another gene target. A novel technique of ribozyme cleavage-based target gene identification (cleavage-specific amplification of cDNA ends) (M. Krüger, C. Beger, P. J. Welch, J. R. Barber, and F. Wong-Staal, Nucleic Acids Res. 29:e94, 2001) revealed that human 20S proteasome alpha-subunit PSMA7 mRNA was a target RNA recognized and cleaved by Rz3'X. We then showed that additional ribozymes directed against PSMA7 RNA inhibited HCV IRES activity in two assay systems: GCV resistance in the HeLa IRES TK reporter cell system and a transient transfection assay performed with a bicistronic Renilla-HCV IRES-firefly luciferase reporter in Huh7 cells. In contrast, ribozymes were inactive against IRES of encephalomyocarditis virus and human rhinovirus. Additionally, proteasome inhibitor MG132 exerted a dose-dependent inhibitory effect on HCV IRES

  1. Self-subunit swapping occurs in another gene type of cobalt nitrile hydratase.

    Directory of Open Access Journals (Sweden)

    Yi Liu

    Full Text Available Self-subunit swapping is one of the post-translational maturation of the cobalt-containing nitrile hydratase (Co-NHase family of enzymes. All of these NHases possess a gene organization of , which allows the activator protein to easily form a mediatory complex with the α-subunit of the NHase after translation. Here, we discovered that the incorporation of cobalt into another type of Co-NHase, with a gene organization of , was also dependent on self-subunit swapping. We successfully isolated a recombinant NHase activator protein (P14K of Pseudomonas putida NRRL-18668 by adding a Strep-tag N-terminal to the P14K gene. P14K was found to form a complex [α(StrepP14K(2] with the α-subunit of the NHase. The incorporation of cobalt into the NHase of P. putida was confirmed to be dependent on the α-subunit substitution between the cobalt-containing α(StrepP14K(2 and the cobalt-free NHase. Cobalt was inserted into cobalt-free α(StrepP14K(2 but not into cobalt-free NHase, suggesting that P14K functions not only as a self-subunit swapping chaperone but also as a metallochaperone. In addition, NHase from P. putida was also expressed by a mutant gene that was designed with a order. Our findings expand the general features of self-subunit swapping maturation.

  2. Self-Subunit Swapping Occurs in Another Gene Type of Cobalt Nitrile Hydratase

    Science.gov (United States)

    Xia, Yuanyuan; Cui, Youtian; Kobayashi, Michihiko; Zhou, Zhemin

    2012-01-01

    Self-subunit swapping is one of the post-translational maturation of the cobalt-containing nitrile hydratase (Co-NHase) family of enzymes. All of these NHases possess a gene organization of , which allows the activator protein to easily form a mediatory complex with the α-subunit of the NHase after translation. Here, we discovered that the incorporation of cobalt into another type of Co-NHase, with a gene organization of , was also dependent on self-subunit swapping. We successfully isolated a recombinant NHase activator protein (P14K) of Pseudomonas putida NRRL-18668 by adding a Strep-tag N-terminal to the P14K gene. P14K was found to form a complex [α(StrepP14K)2] with the α-subunit of the NHase. The incorporation of cobalt into the NHase of P. putida was confirmed to be dependent on the α-subunit substitution between the cobalt-containing α(StrepP14K)2 and the cobalt-free NHase. Cobalt was inserted into cobalt-free α(StrepP14K)2 but not into cobalt-free NHase, suggesting that P14K functions not only as a self-subunit swapping chaperone but also as a metallochaperone. In addition, NHase from P. putida was also expressed by a mutant gene that was designed with a order. Our findings expand the general features of self-subunit swapping maturation. PMID:23226397

  3. Association of nicotinic acetylcholine receptor subunit alpha-4 polymorphisms with smoking behaviors in Chinese male smokers

    Institute of Scientific and Technical Information of China (English)

    CHU Cheng-jing; YANG Yan-chun; WEI Jin-xue; ZHANG Lan

    2011-01-01

    Background It has been reported that the nicotinic acetylcholine receptor subunit a4 gene (CHRNA4) might be associated with smoking behaviors in the previous studies. Up to now, there are few reports on the relationship between CHRNA4 and smoking initiation. In this study, we tried to explore the role of two polymorphisms in CHRNA4 (rs 1044396 and rs 1044397) in smoking initiation and nicotine dependence in Chinese male smokers.Methods Nine hundred and sixty-six Chinese male lifetime nonsmokers and smokers were assessed by the Fagerstr(o)m test for nicotine dependence (FTND), smoking quantity (SQ) and the heaviness of smoking index (HSI). All subjects were divided into four groups based on their tobacco use history and the FTND scores. The polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was performed to find two polymorphisms of CHRNA4 in these subjects.Results The x2 test showed that rs1044396 was significantly associated with smoking initiation (x2=4.65, P=0.031),while both rs1044396 and rs1044397 were significantly associated with nicotine dependence (x2=5.42, P=0.020; x2=758,P=0.005). Furthermore, the T-G (3.9%) haplotype of rs1044396-rs1044397 showed significant association with smoking initiation (x2=6.30, P=0.012) and the C-G haplotype (58.9%) remained positive association with nicotine dependence (x2=8.64, P=0.003) after Bonferroni correction. The C-G haplotype also significantly increased the HSI (P=0.002) and FTND scores (P=0.001) after Bonferroni correction.Conclusion These findings suggest that CHRNA4 may be associated with smoking initiation and the C-G haplotype of rs1044396-rs1044397 might increase the vulnerability to nicotine dependence in Chinese male smokers.

  4. Ab initio study of the {sup 57}Fe quadrupole splitting in the heme models of {alpha}- and {beta}-subunits in tetrameric deoxyhemoglobin

    Energy Technology Data Exchange (ETDEWEB)

    Yuryeva, E. I. [Ural Branch of the Russian Academy of Sciences, Institute of Solid State Chemistry (Russian Federation); Oshtrakh, M. I., E-mail: oshtrakh@mail.utnet.ru [Ural State Technical University - UPI, Division of Applied Biophysics, Faculty of Physical Techniques and Devices for Quality Control (Russian Federation)

    2005-09-15

    Ab initio X{alpha} discrete variation method was used for calculation of quadrupole splitting for the rough heme models in {alpha}- and {beta}-subunits of tetrameric deoxyhemoglobin accounting small stereochemical variations. The differences of theoretical values of quadrupole splitting for these heme models were obtained.

  5. The C-terminal domain of human grp94 protects the catalytic subunit of protein kinase CK2 (CK2alpha) against thermal aggregation. Role of disulfide bonds

    DEFF Research Database (Denmark)

    Roher, N; Miró, F; Boldyreff, B

    2001-01-01

    with dithiothreitol. Grp94-CT conferred protection against aggregation on the catalytic subunit of protein kinase CK2 (CK2alpha), although it did not protect against thermal inactivation. This anti-aggregation effect of grp94-CT was concentration dependent, with full protection achieved at grp94-CT/CK2alpha molar...

  6. CK2(beta)tes gene encodes a testis-specific isoform of the regulatory subunit of casein kinase 2 in Drosophila melanogaster

    DEFF Research Database (Denmark)

    Kalmykova, Alla I; Shevelyov, Yuri Y; Polesskaya, Oksana O

    2002-01-01

    An earlier described CK2(beta)tes gene of Drosophila melanogaster is shown to encode a male germline specific isoform of regulatory beta subunit of casein kinase 2. Western-analysis using anti-CK2(beta)tes Ig revealed CK2(beta)tes protein in Drosophila testes extract. Expression of a CK2(beta...... and coimmunoprecipitation analysis of protein extract from Drosophila testes, we demonstrated an association between CK2(beta)tes and CK2alpha. Northern-analysis has shown that another regulatory (beta') subunit found recently in D. melanogaster genome is also testis-specific. Thus, we describe the first example of two...

  7. Interleukin-2 and subunit alpha of its soluble receptor in autoimmune Addison's disease--an association study and expression analysis.

    Science.gov (United States)

    Fichna, Marta; Żurawek, Magdalena; Bratland, Eirik; Husebye, Eystein S; Kasperlik-Załuska, Anna; Czarnocka, Barbara; Januszkiewicz-Lewandowska, Danuta; Nowak, Jerzy

    2015-03-01

    Autoimmune Addison's disease (AAD) results from T cell-mediated destruction of the adrenal cortex, commonly accompanied by autoantibodies to 21-hydroxylase (21OH). In order to gain insight into the obscure aetiology of this disease, we investigated the roles of the IL2 and IL2RA genes, encoding interleukin-2 and subunit alpha of its receptor (IL2Ra), respectively. The association of AAD with IL2 and IL2RA polymorphisms (rs6822844, rs2069762, rs3136534, rs11594656, rs3118470 and rs2104286) was tested in 223 patients and 672 healthy controls. Functional studies consisted of gene expression analysis in cultured PBMCs exposed to 21OH and evaluation of serum interleukin by ELISA assays. The frequency of the minor C allele of rs3136534 was significantly decreased in AAD subjects compared to controls (OR 0.71; 95%CI 0.561-0.887; p = 0.003). Only AAD cells responded to 21OH with an elevated IL2 and IL2RA mRNA synthesis (p = 0.004 and p = 0.009 versus controls, respectively), paralleled by increased supernatant levels of both cytokines (p = 0.031 and p = 0.001 versus controls). IL2 mRNA level in 21OH-stimulated AAD PBMCs correlated negatively with age (p = 0.036) and positively with serum antibodies to 21OH (p = 0.006). Carriers of the rs2104286 AA genotype demonstrated higher IL2RA mRNA (p = 0.022) and soluble IL2Ra secretion (p = 0.029) upon 21OH stimulation. Serum interleukin-2 in AAD subjects was significantly higher compared to controls (4.61 ± 4.3 versus 1.71 ± 3.2 pg/mL, p < 0.001), whereas sIL2Ra levels remained similar in both groups (p = 0.885). In conclusion, the study reveals an association between AAD and IL2 locus. It confirms specific 21OH-directed reactivity of the peripheral AAD lymphocytes, which display increased synthesis of interleukin-2 and sIL2Ra.

  8. Interaction between obesity and the Hypoxia Inducible Factor 3 Alpha Subunit rs3826795 polymorphism in relation with plasma alanine aminotransferase.

    Science.gov (United States)

    Wang, Shuo; Song, Jieyun; Yang, Yide; Zhang, Yining; Chawla, Nitesh V; Ma, Jun; Wang, Haijun

    2017-07-28

    Hypoxia Inducible Factor 3 Alpha Subunit (HIF3A) DNA has been demonstrated to be associated with obesity in the methylation level, and it also has a Body Mass Index (BMI)-independent association with plasma alanine aminotransferase (ALT). However, the relation among obesity, plasma ALT, HIF3A polymorphism and methylation remains unclear. This study aims to identify the association between HIF3A polymorphism and plasma ALT, and further to determine whether the effect of HIF3A polymorphism on ALT could be modified by obesity or mediated by DNA methylation. The HIF3A rs3826795 polymorphism was genotyped in a case-control study including 2030 Chinese children aged 7-18 years (705 obese cases and 1325 non-obese controls). Furthermore, the HIF3A DNA methylation of the peripheral blood was measured in 110 severely obese children and 110 age- and gender- matched normal-weight controls. There was no overall association between the HIF3A rs3826795 polymorphism and ALT. A significant interaction between obesity and rs3826795 in relation with ALT was found (P inter = 0.042), with rs3826795 G-allele number elevating ALT significantly only in obese children (β' = 0.075, P = 0.037), but not in non-obese children (β' = -0.009, P = 0.741). Additionally, a mediation effect of HIF3A methylation was found in the association between the HIF3A rs3826795 polymorphism and ALT among obese children (β' = 0.242, P = 0.014). This is the first study to report the interaction between obesity and HIF3A gene in relation with ALT, and also to reveal a mediation effect among the HIF3A polymorphism, methylation and ALT. This study provides new evidence to the function of HIF3A gene, which would be helpful for future risk assessment and personalized treatment of liver diseases.

  9. Inefficiency in GM2 ganglioside elimination by human lysosomal beta-hexosaminidase beta-subunit gene transfer to fibroblastic cell line derived from Sandhoff disease model mice.

    Science.gov (United States)

    Itakura, Tomohiro; Kuroki, Aya; Ishibashi, Yasuhiro; Tsuji, Daisuke; Kawashita, Eri; Higashine, Yukari; Sakuraba, Hitoshi; Yamanaka, Shoji; Itoh, Kohji

    2006-08-01

    Sandhoff disease (SD) is an autosomal recessive GM2 gangliosidosis caused by the defect of lysosomal beta-hexosaminidase (Hex) beta-subunit gene associated with neurosomatic manifestations. Therapeutic effects of Hex subunit gene transduction have been examined on Sandhoff disease model mice (SD mice) produced by the allelic disruption of Hexb gene encoding the murine beta-subunit. We demonstrate here that elimination of GM2 ganglioside (GM2) accumulated in the fibroblastic cell line derived from SD mice (FSD) did not occur when the HEXB gene only was transfected. In contrast, a significant increase in the HexB (betabeta homodimer) activity toward neutral substrates, including GA2 (asialo-GM2) and oligosaccharides carrying the terminal N-acetylglucosamine residues at their non-reducing ends (GlcNAc-oligosaccharides) was observed. Immunoblotting with anti-human HexA (alphabeta heterodimer) serum after native polyacrylamide gel electrophoresis (Native-PAGE) revealed that the human HEXB gene product could hardly form the chimeric HexA through associating with the murine alpha-subunit. However, co-introduction of the HEXA encoding the human alpha-subunit and HEXB genes caused significant corrective effect on the GM2 degradation by producing the human HexA. These results indicate that the recombinant human HexA could interspeciesly associate with the murine GM2 activator protein to degrade GM2 accumulated in the FSD cells. Thus, therapeutic effects of the recombinant human HexA isozyme but not human HEXB gene product could be evaluated by using the SD mice.

  10. TNF-alpha stimulation increases dental pulp stem cell migration in vitro through integrin alpha-6 subunit upregulation.

    Science.gov (United States)

    Shi, Lei; Fu, Shanqi; Fahim, Sidra; Pan, Shuang; Lina, He; Mu, Xiaodan; Niu, Yumei

    2017-03-01

    The dissemination of stem cells into tissues requiring inflammatory and reparative response is fundamentally dependent upon their chemotactic migration. Expression of TNF-α is up regulated in inflamed pulps. Dental pulp cells are also known to express integrin α6 subunit. Expression of integrin subunit α6 has been linked to the acquisition of migratory potential in a wide variety of cell types in both pathological and physiological capacities. Therefore, in this study we examined the effects of a pleiotropic cytokine TNF-α on the migration of hDPSCs and investigated its relationship with expression of integrin α6 in hDPSCs during chemotactic migration. hDPSC cultures were established. Protein expression profile of α6 integrin subunit was determined. Effect of exogenous TNF-α (50ng/mL) on hDPSCs' migration potential was evaluated by transwell inserts and in vitro scratch assay. Upregulation/downregulation of TNF-α mediated migration was assayed in presence/absence of integrin α6 respectively. To suppress integrin α6 expression, cells were transfected with integrin α6 siRNA and then cell migration and cytoskeletal changes were evaluated. Our results showed significant increase of hDPSCs' migration after stimulation with TNF-α. By knockdown of integrin α6, which is upregulated by TNF-α, we observed a decrease in the TNF-α directed chemotaxis of hDPSCs. In this study, we show that activation of integrin α6 brought about by TNF-α led to an increase in migratory activity in DPSCs in vitro thus describing a novel association between a cytokine TNF-α and α6 chain of an adhesion receptor integrin in regulating migration of hDPSCs. Copyright © 2016. Published by Elsevier Ltd.

  11. Expression and characterization of a recombinant maize CK-2 alpha subunit

    DEFF Research Database (Denmark)

    Boldyreff, B; Meggio, F; Dobrowolska, G

    1993-01-01

    to support the immunological data also by biochemical and biophysical experiments the availability of a recombinant CK-2 alpha from maize was a prerequisite. A maize cDNA clone of maize CK-2 alpha was expressed in the bacterial strain BL21 (DE3). The recombinant protein was purified to homogeneity; its...... molecular mass on one-dimensional SDS PAGE was estimated to be 36.5 kDa. The calculated molecular mass according to the amino acid composition is 39,228 Da (332 amino acids). The recombinant maize CK-2 alpha (rmCK-2 alpha) exhibited mostly the same properties as the recombinant human CK-2 alpha (rhCK-2...

  12. The cardiac alpha(1C) subunit can support excitation-triggered Ca2+ entry in dysgenic and dyspedic myotubes.

    Science.gov (United States)

    Bannister, Roger A; Beam, Kurt G

    2009-01-01

    Depolarization-induced entry of divalent ions into skeletal muscle has been attributed to a process termed Excitation-Coupled Ca(2+) Entry (ECCE), which is hypothesized to require the interaction of the ryanodine receptor (RyR1), the L-type Ca(2+) channel (DHPR) and another unidentified cation channel. Thus, ECCE is absent in myotubes lacking either the DHPR (dysgenic) or RyR1 (dyspedic). Furthermore, ECCE, as measured by Mn(2+) quench of Fura-2, is reconstituted by expression of a mutant DHPR alpha(1S) subunit (SkEIIIK) thought to be impermeable to divalent cations. Previously, we showed that the bulk of depolarization-induced Ca(2+) entry could be explained by the skeletal L-type current. Accordingly, one would predict that any Ca(2+) current similar to the endogenous current would restore such entry and that this entry would not require coupling to either the DHPR or RyR1. Here, we show that expression of the cardiac alpha(1C) subunit in either dysgenic or dyspedic myotubes does result in Ca(2+) entry similar to that ascribed to ECCE. We also demonstrate that, when potentiated by strong depolarization and Bay K 8644, SkEIIIK supports entry of Mn(2+). These results strongly support the idea that the L-type channel is the major route of Ca(2+) entry in response to repetitive or prolonged depolarization of skeletal muscle.

  13. A network of stimulatory and inhibitory G alpha-subunits regulates olfaction in Caenorhabditis elegans.

    NARCIS (Netherlands)

    H. Lans (Hannes); S. Rademakers (Suzanne); G. Jansen (Gert)

    2004-01-01

    textabstractThe two pairs of sensory neurons of C. elegans, AWA and AWC, that mediate odorant attraction, express six Galpha-subunits, suggesting that olfaction is regulated by a complex signaling network. Here, we describe the cellular localization and functions of the six olfacto

  14. Molecular determinants of desensitization and assembly of the chimeric GABA(A) receptor subunits (alpha1/gamma2) and (gamma2/alpha1) in combinations with beta2 and gamma2

    DEFF Research Database (Denmark)

    Elster, L; Kristiansen, U; Pickering, D S

    2001-01-01

    2 and the remainder of the gamma2 or alpha1 subunits, respectively, were expressed with beta2 and beta2gamma2 in Spodoptera frugiperda (Sf-9) cells using the baculovirus expression system. The (alpha1/gamma2)beta2 and (alpha1/gamma2)beta2gamma2 but not the (gamma2/alpha1)beta2 and (gamma2/alpha1......)beta2gamma2 subunit combinations formed functional receptor complexes as shown by whole-cell patch-clamp recordings and [3H]muscimol and [3H]flunitrazepam binding. Moreover, the surface immunofluorescence staining of Sf-9 cells expressing the (alpha1/gamma2)-containing receptors was pronounced...

  15. The catalytic subunit of protein phosphatase 1 gamma regulates thrombin-induced murine platelet alpha(IIbbeta(3 function.

    Directory of Open Access Journals (Sweden)

    Francisca C Gushiken

    Full Text Available Hemostasis and thrombosis are regulated by agonist-induced activation of platelet integrin alpha(IIbbeta(3. Integrin activation, in turn is mediated by cellular signaling via protein kinases and protein phosphatases. Although the catalytic subunit of protein phosphatase 1 (PP1c interacts with alpha(IIbbeta(3, the role of PP1c in platelet reactivity is unclear.Using gamma isoform of PP1c deficient mice (PP1cgamma(-/-, we show that the platelets have moderately decreased soluble fibrinogen binding and aggregation to low concentrations of thrombin or protease-activated receptor 4 (PAR4-activating peptide but not to adenosine diphosphate (ADP, collagen or collagen-related peptide (CRP. Thrombin-stimulated PP1cgamma(-/- platelets showed decreased alpha(IIbbeta(3 activation despite comparable levels of alpha(IIbbeta(3, PAR3, PAR4 expression and normal granule secretion. Functions regulated by outside-in integrin alpha(IIbbeta(3 signaling like adhesion to immobilized fibrinogen and clot retraction were not altered in PP1cgamma(-/- platelets. Thrombus formation induced by a light/dye injury in the cremaster muscle venules was significantly delayed in PP1cgamma(-/- mice. Phosphorylation of glycogen synthase kinase (GSK3beta-serine 9 that promotes platelet function, was reduced in thrombin-stimulated PP1cgamma(-/- platelets by an AKT independent mechanism. Inhibition of GSK3beta partially abolished the difference in fibrinogen binding between thrombin-stimulated wild type and PP1cgamma(-/- platelets.These studies illustrate a role for PP1cgamma in maintaining GSK3beta-serine9 phosphorylation downstream of thrombin signaling and promoting thrombus formation via fibrinogen binding and platelet aggregation.

  16. Interaction of the heterotrimeric G protein alpha subunit SSG-1 of Sporothrix schenckii with proteins related to stress response and fungal pathogenicity using a yeast two-hybrid assay

    Directory of Open Access Journals (Sweden)

    González-Méndez Ricardo

    2010-12-01

    Full Text Available Abstract Background Important biological processes require selective and orderly protein-protein interactions at every level of the signalling cascades. G proteins are a family of heterotrimeric GTPases that effect eukaryotic signal transduction through the coupling of cell surface receptors to cytoplasmic effector proteins. They have been associated with growth and pathogenicity in many fungi through gene knock-out studies. In Sporothrix schenckii, a pathogenic, dimorphic fungus, we previously identified a pertussis sensitive G alpha subunit, SSG-1. In this work we inquire into its interactions with other proteins. Results Using the yeast two-hybrid technique, we identified protein-protein interactions between SSG-1 and other important cellular proteins. The interactions were corroborated using co-immuneprecipitation. Using these techniques we identified a Fe/Mn superoxide dismutase (SOD, a glyceraldehyde-3-P dehydrogenase (GAPDH and two ion transport proteins, a siderophore-iron transporter belonging to the Major Facilitator Superfamily (MFS and a divalent-cation transporter of the Nramp (natural resistance-associated macrophage protein family as interacting with SSG-1. The cDNA's encoding these proteins were sequenced and bioinformatic macromolecular sequence analyses were used for the correct classification and functional assignment. Conclusions This study constitutes the first report of the interaction of a fungal G alpha inhibitory subunit with SOD, GAPDH, and two metal ion transporters. The identification of such important proteins as partners of a G alpha subunit in this fungus suggests possible mechanisms through which this G protein can affect pathogenicity and survival under conditions of environmental stress or inside the human host. The two ion transporters identified in this work are the first to be reported in S. schenckii and the first time they are identified as interacting with fungal G protein alpha subunits. The association

  17. An antisense oligodeoxynucleotide that depletes RI alpha subunit of cyclic AMP-dependent protein kinase induces growth inhibition in human cancer cells.

    Science.gov (United States)

    Yokozaki, H; Budillon, A; Tortora, G; Meissner, S; Beaucage, S L; Miki, K; Cho-Chung, Y S

    1993-02-15

    Enhanced expression of the RI alpha subunit of cyclic AMP-dependent protein kinase type I has been correlated with cancer cell growth. We provide evidence that RI alpha is a growth-inducing protein that may be essential for neoplastic cell growth. Human colon, breast, and gastric carcinoma and neuroblastoma cell lines exposed to a 21-mer human RI alpha antisense phosphorothioate oligodeoxynucleotide (S-oligodeoxynucleotide) exhibited growth inhibition with no sign of cytotoxicity. Mismatched sequence (random) S-oligodeoxynucleotides of the same length exhibited no effect. The growth inhibitory effect of RI alpha antisense oligomer correlated with a decrease in the RI alpha mRNA and protein levels and with an increase in RII beta (the regulatory subunit of protein kinase type II) expression. The growth inhibition was abolished, however, when cells were exposed simultaneously to both RI alpha and RII beta antisense S-oligodeoxynucleotides. The RII beta antisense S-oligodeoxynucleotide alone, exhibiting suppression of RII beta along with enhancement of RI alpha expression, led to slight stimulation of cell growth. These results demonstrate that two isoforms of cyclic AMP receptor proteins, RI alpha and RII beta, are reciprocally related in the growth control of cancer cells and that the RI alpha antisense oligodeoxynucleotide, which efficiently depletes the growth stimulatory RI alpha, is a powerful biological tool toward suppression of malignancy.

  18. Conformational alterations resulting from mutations in cytoplasmic domains of the alpha subunit of the Na,K-ATPase

    DEFF Research Database (Denmark)

    Blostein, R; Daly, S E; MacAulay, Nanna;

    1998-01-01

    , and decreased sensitivity to inhibition by vanadate. The striking changes observed with alpha 1M32E233K suggests interactions between the N-terminus, the beta-strand in the M2-M3 loop and the catalytic phosphorylation site. The behavior of these mutants contrasts with that of least one mutant involving......This paper summarizes experiments concerned with the functional consequences of mutations in cytoplasmic regions of the alpha 1 subunit of the Na,K-ATPase, in particular the amino terminus, the first cytoplasmic loop between transmembrane segments M2 and M3, and the major cytoplasmic loop between M......4 and M5. In the first mutation (alpha 1M32), 32 residues were removed from the N-terminus. The second mutation (E233K) was in the putative beta strand of M2-M3 loop and the third, comprised the replacement of the amino terminal half of loop M4-M5 of the Na,K-ATPase with the homologous segment...

  19. Estrogen dissociates Tau and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor subunit in postischemic hippocampus.

    Science.gov (United States)

    Cardona-Gómez, Gloria Patricia; Arango-Davila, Cesar; Gallego-Gómez, Juan Carlos; Barrera-Ocampo, Alvaro; Pimienta, Hernan; Garcia-Segura, Luis Miguel

    2006-08-21

    During cerebral ischemia, part of the damage associated with the hyperactivation of glutamate receptors results from the hyperphosphorylation of the microtubule-associated protein Tau. Previous studies have shown that estradiol treatment reduces neural damage after cerebral ischemia. Here, we show that transient occlusion of the middle cerebral artery results in the hyperphosphorylation of Tau and in a significant increase in the association of Tau with glycogen synthase kinase-3beta and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid type glutamate receptor subunits 2/3 in the hippocampus. Estradiol treatment decreased hippocampal injury, inhibited glycogen synthase kinase-3beta and decreased the hyperphosphorylation of Tau and the interaction of Tau with glycogen synthase kinase-3beta and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor. These findings suggest that ischemia produces a strong association between Tau and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor, and estradiol can exert at least part of its neuroprotective activity through inhibition of glycogen synthase kinase-3beta.

  20. Production and characterization of antibody probes directed at constant regions of the alpha and beta subunit of the human T cell receptor.

    Science.gov (United States)

    Fabbi, M; Acuto, O; Bensussan, A; Poole, C B; Reinherz, E L

    1985-08-01

    To generate antibodies directed at constant regions of the human T cell receptor, purified alpha and beta subunits of a human T cell antigen/major histocompatibility complex receptor from the REX tumor (Ti-REX) were isolated by preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis and utilized to immunize rabbits. H36 (anti-alpha subunit) and H38 (anti-beta subunit) antisera were strongly reactive with the denatured subunits and also immunoprecipitated the Ti heterodimer from 125I surface-labeled lysates of REX, inducer, suppressor and cytotoxic T cell clones, peripheral T lymphocytes and thymocytes. Moreover, immunodepletion experiments showed that such antisera recognized antigenic determinant(s) shared by all Ti molecules expressed in the thymus. Several observations were made with these anticonstant region antibodies. First, peptide map analysis showed that the T cell receptor molecules recognized by the anti-clonotype and the anti-constant region heteroantisera on a given T cell clone are identical, thus supporting the view that the T cell receptor undergoes allelic exclusion. Second, since the individual antisera were weakly cross-reactive with the other denatured subunit, such subunits probably share conserved sequences. Third, the absence of antisera reactivity with intact cells implies that most of these constant region epitopes must be obscured by associated molecules, perhaps including one or more of the 20-25-kDa T3 subunits. Fourth, the extensive difference in two-dimensional peptide maps of Ti alpha subunits from clones of differing specificities makes it likely that the subunit contributes in a major way to antigen/major histocompatibility complex binding.

  1. Suggestive association between the C825T polymorphism of the G-protein beta3 subunit gene (GNB3) and clinical improvement with antipsychotics in schizophrenia.

    Science.gov (United States)

    Müller, Daniel J; De Luca, Vincenzo; Sicard, Tricia; King, Nicole; Hwang, Rudi; Volavka, Jan; Czobor, Pal; Sheitman, Brian B; Lindenmayer, Jean-Pierre; Citrome, Leslie; McEvoy, Joseph P; Lieberman, Jeffrey A; Meltzer, Herbert Y; Kennedy, James L

    2005-10-01

    G-proteins are composed of alpha, beta and gamma subunits. Once activated, these subunits play a major role in the conversion of external receptor activation into intracellular signals. The functional C825T polymorphism of the beta3 subunit gene (GNB3) has recently been shown to modulate antidepressant response, with the T-allele conferring an increased signaling and being associated with favorable antidepressant response. We hypothesized that this polymorphism may be associated with response to antipsychotics in a population of 145 chronic schizophrenic patients deriving from two study-samples and being mainly treated with clozapine for up to 6 months. Overall, the C/C genotype was significantly associated with relative clinical improvement as measured by Brief Psychiatric Rating Scale (BPRS) change scores after 6 and 12 weeks (ppoint to the role of intracellular mechanisms in antipsychotic response.

  2. Determination of alpha-2-MRAP gene polymorphisms in nephrolithiasis patients.

    Science.gov (United States)

    Mehde, Atheer Awad; Mehdi, Wesen Adel; Yusof, Faridah; Raus, Raha Ahmed; Abidin, Zaima Azira Zainal; Ghazali, Hamid; Rahman, Azlina Abd

    2017-07-29

    The intron 5 insertion/deletion polymorphism of Alpha-2-macroglobulin receptor-associated protein gene (Alpha-2-MRAP) has been implicated in numerous diseases. The current study was designed to analyze the association of intron 5 insertion/deletion polymorphism of Alpha-2-MRAP with nephrolithiasis patients. PCR was conducted on genomic DNA of patients and control to look for Alpha-2-MRAP insertion/deletion polymorphism. Besides that, serum level of Alpha-2-MRAP, oxidative stress marker myeloperoxidase, Malondialdehyde (MDA), Advanced oxidation protein products (AOPP), and uric acid were determined. The D and I allele frequencies were 57.50% and 42.50% in patients, 77.50% and 22.50% in control, individually. The result showed that II genotype was associated with nephrolithiasis patients group. A significant decrease was observed in serum Alpha-2-MRAP,myeloperoxidase and TAS,while TOS,OSI,MDA,AOPP and uric acid were substantially increased in II and ID when compared to DD genotype in patients with nephrolithiasis. Our results demonstrate for the first time that patients with II genotype had an increased risk of stones. Also, the results demonstrate that I allele of the 5 insertion/deletion polymorphism in the Alpha-2-MRAP gene is related with an increase of oxidative stress in nephrolithiasis patients and may possibly impose a risk for cardiovascular diseases in patients with II genotype of Alpha-2-MRAP. Copyright © 2017. Published by Elsevier B.V.

  3. The Sleep–Wake Cycle in the Nicotinic Alpha-9 Acetylcholine Receptor Subunit Knock-Out Mice

    Directory of Open Access Journals (Sweden)

    Natalia Madrid-López

    2017-10-01

    Full Text Available There is a neural matrix controlling the sleep–wake cycle (SWC embedded within high ranking integrative mechanisms in the central nervous system. Nicotinic alpha-9 acetylcholine receptor subunit (alpha-9 nAChR participate in physiological processes occurring in sensory, endocrine and immune systems. There is a relationship between the SWC architecture, body homeostasis and sensory afferents so that disruption of afferent signaling is expected to affect the temporal organization of sleep and wake states. The analysis of the SWC of 9 nAChR knock-out animals may help to reveal the contribution of alpha-9 nAChR to sleep chronobiological determinants. Here we explore the polysomnogram in chronically implanted alpha-9 nAChR knock-out (KO and wild-type (WT individuals of the hybrid CBA/Sv129 mouse strain. Records were obtained in isolation chambers under a stable 12:12 light:dark cycle (LD. To unmask the 24-h modulation of the SWC a skeleton photoperiod (SP protocol was performed. Under LD the daily quota (in % of wakefulness (W, NREM sleep and REM sleep obtained in KO and WT animals were 45, 48 and 7, and 46, 46 and 8 respectively. Both groups exhibit nocturnal phase preference of W as well as diurnal and unimodal phase preference of NREM and REM sleep. The acrophase mean angles of KO vs. WT genotypes were not different (Zeitgeber Time: 6.5 vs. 14.9 for W, 4.3 vs. 2.8 for NREM sleep and 5.3 vs. 3.4 for REM sleep, respectively. Transference to SP do not affect daily state quotas, phase preferences and acrophases among genotypes. Unmasking phenomena of the SWC such as wake increment during the rest phase under SP was evident only among WT mice suggesting the involvement of retinal structures containing alpha-9 nAChR in masking processes. Furthermore, KO animals exhibit longer NREM and REM sleep episodes that is independent of illumination conditions. Consolidated diurnal NREM sleep contributed to obtain higher values of NREM sleep delta-EEG activity

  4. Effect of NIP-142 on potassium channel alpha-subunits Kv1.5, Kv4.2 and Kv4.3, and mouse atrial repolarization.

    Science.gov (United States)

    Tanaka, Hikaru; Namekata, Iyuki; Hamaguchi, Shogo; Kawamura, Taro; Masuda, Hiroyuki; Tanaka, Yoshio; Iida-Tanaka, Naoko; Takahara, Akira

    2010-01-01

    Effects of NIP-142, a benzopyran compound which terminates experimental atrial arrhythmia, on potassium channel alpha-subunits and mouse atrial repolarization were examined. NIP-142 concentration-dependently blocked the outward current through potassium channel alpha subunits Kv1.5, Kv4.2 and Kv4.3 expressed in Xenopus oocytes. In isolated mouse atrial myocardia, NIP-142 prolonged the action potential duration and effective refractory period, and increased the contractile force. These results suggest that NIP-142 blocks the potassium channels underlying the transient and sustained outward currents, which may contribute to its antiarrhythmic activity.

  5. A P-loop Mutation in G[alpha] Subunits Prevents Transition to the Active State: Implications for G-protein Signaling in Fungal Pathogenesis

    Energy Technology Data Exchange (ETDEWEB)

    Bosch, Dustin E.; Willard, Francis S.; Ramanujam, Ravikrishna; Kimple, Adam J.; Willard, Melinda D.; Naqvi, Naweed I.; Siderovski, David P. (UNC); (Singapore)

    2012-10-23

    Heterotrimeric G-proteins are molecular switches integral to a panoply of different physiological responses that many organisms make to environmental cues. The switch from inactive to active G{alpha}{beta}{gamma} heterotrimer relies on nucleotide cycling by the G{alpha} subunit: exchange of GTP for GDP activates G{alpha}, whereas its intrinsic enzymatic activity catalyzes GTP hydrolysis to GDP and inorganic phosphate, thereby reverting G{alpha} to its inactive state. In several genetic studies of filamentous fungi, such as the rice blast fungus Magnaporthe oryzae, a G42R mutation in the phosphate-binding loop of G{alpha} subunits is assumed to be GTPase-deficient and thus constitutively active. Here, we demonstrate that G{alpha}(G42R) mutants are not GTPase deficient, but rather incapable of achieving the activated conformation. Two crystal structure models suggest that Arg-42 prevents a typical switch region conformational change upon G{alpha}{sub i1}(G42R) binding to GDP {center_dot} AlF{sub 4}{sup -} or GTP, but rotameric flexibility at this locus allows for unperturbed GTP hydrolysis. G{alpha}(G42R) mutants do not engage the active state-selective peptide KB-1753 nor RGS domains with high affinity, but instead favor interaction with G{beta}{gamma} and GoLoco motifs in any nucleotide state. The corresponding G{alpha}{sub q}(G48R) mutant is not constitutively active in cells and responds poorly to aluminum tetrafluoride activation. Comparative analyses of M. oryzae strains harboring either G42R or GTPase-deficient Q/L mutations in the G{alpha} subunits MagA or MagB illustrate functional differences in environmental cue processing and intracellular signaling outcomes between these two G{alpha} mutants, thus demonstrating the in vivo functional divergence of G42R and activating G-protein mutants.

  6. Localization of a new type of X-linked liver glycogenosis to the chromosomal region Xp22 containing the liver {alpha}-subunit of phosphorylase kinase (PHKA2)

    Energy Technology Data Exchange (ETDEWEB)

    Hendrickx, J.; Coucke, P.; Willems, P.J. [Univ. of Antwerp (Belgium)] [and others

    1994-06-01

    The authors describe here a new type of X-linked liver glycogen storage disease. The main symptoms include liver enlargement and growth retardation. The clinical and biochemical abnormalities of this glycogenosis are similar to those of classical X-linked liver glycogenosis due to phosphorylase kinase deficiency (XLG). However, in constrast to patients with XLG, the patients described here have no reduced phosphorylase kinase activity in erythrocytes and leukocytes, and no enzyme deficiency could be found. Linkage analysis of four families with this X-linked type of liver glycogenosis assigned the disease gene to Xp22. Lod scores obtained with the markers DXS987, DXS207, and DXS999 were 3.97, 2.71, and 2.40, respectively, all at 0% recombination. Multipoint linkage analysis localized the disease gene between DXS143 and DXS989 with a maximum lod score of 4.70 at {theta}=0, relative to DXS987. As both the classical XLG gene and the liver {alpha}-subunit of PHK (PHKA2) are also located in Xp22, this variant type of XLG may be allelic to classical XLG, and both diseases may be caused by mutations in PHKA2. Therefore, they propose to classify XLG as XLG type I (the classical type of XLG) and XLG type II (the variant type of XLG). 28 refs., 2 figs., 3 tabs.

  7. Sequenciamento e análise dos genes das subunidades alfa e beta do hormônio folículo estimulante de bovino (Bos taurus indicus Sequencing and analysis of subunits alpha and beta of the follicle stimulating hormone from bovine (Bos taurus indicus

    Directory of Open Access Journals (Sweden)

    Luci Sayori Murata

    2008-07-01

    of the subunits alpha and beta of the Bos taurus indicus follicle stimulated hormone (FSH. It to compare the results of sequencing these subunits between subunits aplha and beta from swine and Bos taurus taurus previouly published in GenBank. There was a high similarity between nucleotides and predicted amino acids in the αFSH chain of Bos taurus indicus and those of swine and buffalo. In the compare the sequence of the subunit of αFSH of Bos taurus indicus with swine showed differences in three aminoacid residues with ßFSH there was a modification in the first base of the codon, which had to an alteration in the 83 amino acid residue which in Bos taurus indicus and a glycin, this was serine in Bos taurus taurus. This modification, as well as those indentyfied in cDNA of the αFSH and ßFSH chains were confirmed by cloning. The modification of serine for glycine in position 83 was the only substitute that altered the residue in the comparson between ßFSH subunit of Bos taurus indicus and Bos taurus taurus. Nevertheles this modification showld not significantly alter the physiological properties of FSH as the glycine residue was also found in the swine ßFSH, it is therefore a specific modification which distinguishes between the ßFSH of Bos taurus taurus and Bos taurus indicus.

     

    KEY WORDS: Bovine, cloning, FSH, hormone.

  8. 1, 4-alpha-Glucan phosphorylase from Klebsiella pneumoniae purification, subunit structure and amino acid composition.

    Science.gov (United States)

    Linder, D; Kurz, G; Bender, H; Wallenfels, K

    1976-11-01

    1. A 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae has been purified about 80-fold with an over-all yield greater than 35%. The purified enzyme has been shown to be homogeneous by gel electrophoresis at different pH-values, by isoelectric focusing, by dodecylsulfate electrophoresis and by ultracentrifugation. 2. The molecular weight of the native enzyme has been determined to be 180 000 by ultra-centrifugation studies, in good agreement with the value of 189 000 estimated by gel permeation chromatography. 3. The enzyme dissociates in the presence of 0.1% dodecylsulfate or 5 M guanidine hydrochloride into polypeptide chains. The molecular weight of these polypeptide chains has been found to be 88 000 by dodecylsulfate polyacrylamide gel electrophoresis and 99 000 by sedimentation equilibrium studies, indicating that the native enzyme is composed of two polypeptide chains. 4. The enzyme contains pyridoxalphosphate with a stoichiometry of two moles per 180 000 g protein, confirming that the 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is a dimeric enzyme. 5. The amino acid composition of the enzyme has been determined, and its correspondence to that of 1,4-alpha-glucan phosphorylases from other sources is discussed. 6. The pI of the enzyme has been shown to be 5.3 and its pH-optimum to be about pH 5.9. The enzyme is stable in the range from pH 5.9 to 10.5.

  9. Early transcription factor subunits are encoded by vaccinia virus late genes.

    Science.gov (United States)

    Gershon, P D; Moss, B

    1990-06-01

    The vaccinia virus early transcription factor (VETF) was shown to be a virus-encoded heterodimer. The gene for the 82-kDa subunit was identified as open reading frame (ORF) A8L, based on the N-terminal sequence of factor purified by using DNA-affinity magnetic beads. The 70-kDa subunit of VETF was refractory to N-terminal analysis, and so N-terminal sequences were obtained for three internal tryptic peptides. All three peptides matched sequences within ORF D6R. ORFs A8L and D6R are located within the central region of the vaccinia virus genome and are separated by about 13,600 base pairs. Proteins corresponding to the 3' ends of ORFs A8L and D6R were overexpressed in Escherichia coli and used to prepare antisera that bound to the larger and smaller subunits, respectively, of affinity-purified VETF. Immunoblot analysis of proteins from infected cells indicated that both subunits are expressed exclusively in the late phase of infection, just prior to their packaging in virus particles. The two subunits of VETF have no significant local or overall amino acid sequence homology to one another, to other entries in biological sequence data bases including bacterial sigma factors, or to recently determined sequences of some eukaryotic transcription factors. The 70-kDa subunit, however, has motifs in common with a super-family of established and putative DNA and RNA helicases.

  10. AMPKα2基因克隆及其野生型和突变型真核表达载体的构建%Cloning of activating adenosine monophosphate-activated protein kinase alpha 2 subunit gene and construction of its wild-type and mutant eukaryotic expression vectors

    Institute of Scientific and Technical Information of China (English)

    罗招凡; 李芳萍; 丁鹤林; 程桦

    2009-01-01

    背景:实验表明,通过激活单磷酸腺苷激活的蛋白激酶(AMP-Activated Protein Kinase, AMPK)α2可以增加胰岛素的敏感性和骨骼肌葡萄糖的摄取,其有望成为预防和治疗2型糖尿病的新的生理和药理作用靶点.目的:克隆人的AMPKα2基因,并构建其野生型和突变型真核表达载体.设计:单一样本观察.时间及地点:实验于2007-04/2008-01在中山大学附属第二医院临床分子生物实验室完成.材料:QuikChange Ⅱ Site-Directed Mutagenesis Kit为Stratagene公司产品.真核表达载体pcDNA3.1(+),大肠杆菌DH5α为实验室保存.人骨胳肌组织来源于中山大学附属第二医院手术截肢患者,获患者知情同意,新鲜取材后液氮冷冻.方法:采用反转录一聚合酶链反应技术从人骨骼肌扩增AMPKα2基因,并将其克隆到T载体,通过测序对其进行鉴定.采用Quickchange定点诱变试剂盒对AMPKα2基因进行体外定点诱变,并将其野生和突变的编码基因亚克隆到真核表达载体pcDNA3.1中,通过酶切和测序进行鉴定.主要观察指标:①目的基因的克隆.②定点诱变.③真核表达质粒的构建.结果:成功克隆了AMPKα2基因,大小约1 700 bp,与已发表的AMPKα2同源性为99%,GenBank录入号EF056019.成功将AMPKα2第45位Lysine(AAA)突变为Arginine(AGA),成功构建了野生型和突变型pcDNA-AMPK α2重组质粒.结论:实验成功克隆了AMPKα2基因,构建了其野生型和突变型真核表达载体.%BACKGROUND: The experimental results showed that insulin sensitivity and glucose uptake in skeletal muscle could be improved by activating adenosine monophosphate-activated protein kinase a2 (AMPKα2). AMPKa2 is expected to become a new physiological and pharmacological target for the prevention and treatment of type 2 diabetes mellitus. OBJECTIVE: To clone human AMPKa2 subunit gene and to construct its wild-type and mutant eukaryotic expression vectors. DESIGN: A single sample observation

  11. Exploring the putative self-binding property of the human farnesyltransferase alpha-subunit.

    Science.gov (United States)

    Hagemann, Anna; Müller, Grit; Manthey, Iris; Bachmann, Hagen Sjard

    2017-09-26

    Farnesylation is an important post-translational protein modification in eukaryotes. Farnesylation is performed by protein farnesyltransferase, a heterodimer composed of an α- (FTα) and a β-subunit. Recently, homo-dimerization of truncated rat and yeast FTα has been detected, suggesting a new role for FTα homodimers in signal transduction. We investigated the putative dimerization behaviour of human and rat FTα. Different in vitro and in vivo approaches revealed no self-dimerization and a presumably artificial formation of homo-trimers and higher homo-oligomers in vitro. Our study contributes to the clarification of the physiological features of FTase in different species and may be important for the ongoing development of FTase inhibitors. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.

  12. Structure of the gene encoding the murine protein kinase CK2 beta subunit

    DEFF Research Database (Denmark)

    Boldyreff, B; Issinger, O G

    1995-01-01

    The mouse protein kinase CK2 beta subunit gene (Csnk2b) is composed of seven exons contained within 7874 bp. The exon and intron lengths extend from 76 to 321 and 111 to 1272 bp, respectively. The lengths of the murine coding exons correspond exactly to the lengths of the exons in the human CK2...

  13. Mutations in genes encoding subunits of RNA polymerases I and III cause Treacher Collins syndrome.

    NARCIS (Netherlands)

    Dauwerse, J.G.; Dixon, J.; Seland, S.; Ruivenkamp, C.A.; Haeringen, A. van; Hoefsloot, L.H.; Peters, D.J.; Boers, A.C.; Daumer-Haas, C.; Maiwald, R.; Zweier, C.; Kerr, B.; Cobo, A.M.; Toral, J.F.; Hoogeboom, A.J.M.; Lohmann, D.R.; Hehr, U.; Dixon, M.J.; Breuning, M.H.; Wieczorek, D.

    2011-01-01

    We identified a deletion of a gene encoding a subunit of RNA polymerases I and III, POLR1D, in an individual with Treacher Collins syndrome (TCS). Subsequently, we detected 20 additional heterozygous mutations of POLR1D in 252 individuals with TCS. Furthermore, we discovered mutations in both allele

  14. Molecular cloning and expression of heteromeric ACCase subunit genes from Jatropha curcas.

    Science.gov (United States)

    Gu, Keyu; Chiam, Huihui; Tian, Dongsheng; Yin, Zhongchao

    2011-04-01

    Acetyl-CoA carboxylase (ACCase) catalyzes the biotin-dependent carboxylation of acetyl-CoA to produce malonyl-CoA, which is the essential first step in the biosynthesis of long-chain fatty acids. ACCase exists as a multi-subunit enzyme in most prokaryotes and the chloroplasts of most plants and algae, while it is present as a multi-domain enzyme in the endoplasmic reticulum of most eukaryotes. The heteromeric ACCase of higher plants consists of four subunits: an α-subunit of carboxyltransferase (α-CT, encoded by accA gene), a biotin carboxyl carrier protein (BCCP, encoded by accB gene), a biotin carboxylase (BC, encoded by accC gene) and a β-subunit of carboxyltransferase (β-CT, encoded by accD gene). In this study, we cloned and characterized the genes accA, accB1, accC and accD that encode the subunits of heteromeric ACCase in Jatropha (Jatropha curcas), a potential biofuel plant. The full-length cDNAs of the four subunit genes were isolated from a Jatropha cDNA library and by using 5' RACE, whereas the genomic clones were obtained from a Jatropha BAC library. They encode a 771 amino acid (aa) α-CT, a 286-aa BCCP1, a 537-aa BC and a 494-aa β-CT, respectively. The single-copy accA, accB1 and accC genes are nuclear genes, while the accD gene is located in chloroplast genome. Jatropha α-CT, BCCP1, BC and β-CT show high identity to their homologues in other higher plants at amino acid level and contain all conserved domains for ACCase activity. The accA, accB1, accC and accD genes are temporally and spatially expressed in the leaves and endosperm of Jatropha plants, which are regulated by plant development and environmental factors. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  15. The human T cell receptor alpha variable (TRAV) genes.

    Science.gov (United States)

    Scaviner, D; Lefranc, M P

    2000-01-01

    'Human T Cell Receptor Alpha Variable (TRAV) Genes', the eighth report of the 'IMGT Locus in Focus' section, comprises four tables: (1) 'Number of human germline TRAV genes at 14q11 and potential repertoire'; (2) 'Human germline TRAV genes at 14q11'; (3) 'Human TRAV allele table', and (4) 'Correspondence between the different human TRAV gene nomenclatures'. These tables are available at the IMGT Marie-Paule page of IMGT, the international ImMunoGeneTics database (http://imgt.cines.fr:8104) created by Marie-Paule Lefranc, Université Montpellier II, CNRS, France. Copyright 2000 S. Karger AG, Basel

  16. Expression of the GABA(A) receptor alpha6 subunit in cultured cerebellar granule cells is developmentally regulated by activation of GABA(A) receptors

    DEFF Research Database (Denmark)

    Carlson, B X; Belhage, B; Hansen, G H

    1997-01-01

    , no significant change in [3H]Ro15-4513 binding was observed for the 56-kDa polypeptide. Immunolabeling of the alpha6 subunit using silver-enhanced, immuno-gold staining of granule cells showed a significant effect with THIP treatment only at 4 DIV and not at 8 DIV. Examination by light microscopy demonstrated...

  17. The human mitochondrial NADH: Ubiquinone oxidoreductase 51-kDa subunit oxidoreductase 51-kDa subunit maps adjacent to the glutathione S-transferase P1-1 gene on chromosome 11q13

    Energy Technology Data Exchange (ETDEWEB)

    Spencer, S.R.; Taylor, J.B.; Cowell, I.G.; Xia, C.L.; Pemble, S.E.; Ketterer, B. (Univ. College and Middlesex School of Medicine, London (United Kingdom))

    1992-12-01

    The soluble glutathione transferases (GSTs) are a family of dimeric isoenymes catalyzing the conjugation of glutathione to hydrophobic electropiles. Their subunits can be grouped into four families, alpha, mu, pi, and theta, on the basis of their primary structures. In man, the pi class is represented by a single gene, GSTP1-1 (GST[pi]) localized to human chromosome 11, band q13. The oncogenes INT2, HSTF1, and PRAD1 are also localized at 11q13, and together with the GSTP1 locus and other gene loci mapped to 11q13, i.e., BCL1 and EMS1, they form a unit of DNA approximately 2000-2500 kb, known as the 11q13 amplicon, which is often amplified in a range of solid tumors. Any gene locus at 11q13 is of interest because it may influence tumorigenesis. 14 refs., 1 fig.

  18. STEADY-STATE TRANSCRIPT LEVELS OF CYTOCHROME-C-OXIDASE GENES DURING HUMAN MYOGENESIS INDICATE SUBUNIT SWITCHING OF SUBUNIT VIA AND COEXPRESSION OF SUBUNIT VIIA ISOFORMS

    NARCIS (Netherlands)

    TAANMAN, JW; HERZBERG, NH; DEVRIES, H; BOLHUIS, PA; VANDENBOGERT, C

    1992-01-01

    Steady-state levels of the mitochondrial rRNAs, of mRNAs for mitochondrially and nuclear-encoded subunits of cytochrome c oxidase and for the beta-subunit of ATP synthase were assessed by Northern blot hybridizations during the in vitro differentiation of human myoblasts. Transcript levels of the so

  19. Cloning and sequencing of the genes coding for the A and B subunits of vacuolar-type Na(+)-ATPase from Enterococcus hirae. Coexistence of vacuolar- and F0F1-type ATPases in one bacterial cell.

    Science.gov (United States)

    Takase, K; Yamato, I; Kakinuma, Y

    1993-06-05

    The eubacterium Enterococcus hirae ATCC 9790 possesses a H(+)-translocating ATPase, and the deduced amino acid sequences of the genes coding for this enzyme have indicated that it is a typical F0F1-type ATPase (Shibata, C., Ehara, T., Tomura, K., Igarashi, K., and Kobayashi, H. (1992) J. Bacteriol. 174, 6117-6124). We cloned the ntpA and ntpB genes coding for the A and B subunits, respectively, of Na(+)-translocating ATPase from the same bacterium, and the full amino acid sequences of the two subunits were deduced from the nucleotide sequence. The A (593 amino acid residues) and B (458 amino acid residues) subunits were highly homologous (48-60% identical) to the A (large or alpha) and the B (small or beta) subunits, respectively, of vacuolar-type H(+)-ATPases which have been found in eukaryotic endomembrane systems (Neurospora crassa, Saccharomyces cerevisiae, Arabidopsis thaliana, and carrot) and archaebacterial cell membranes (Sulfolobus acidocaldarius and Methanosarcina barkeri). The A and B subunits of Na(+)-ATPase showed about 23-28% identities with the beta and alpha subunits of E. hirae F1-ATPase and of Escherichia coli F1-ATPase, respectively. These results indicate that E. hirae Na(+)-ATPase belongs to the vacuolar-type ATPase. This is the first demonstration that both genes for V- and F-type ATPases are functionally expressed in one bacterial cell.

  20. Plasminogen activator inhibitor type 1 interacts with alpha3 subunit of proteasome and modulates its activity.

    Science.gov (United States)

    Boncela, Joanna; Przygodzka, Patrycja; Papiewska-Pajak, Izabela; Wyroba, Elzbieta; Osinska, Magdalena; Cierniewski, Czeslaw S

    2011-02-25

    Plasminogen activator inhibitor type-1 (PAI-1), a multifunctional protein, is an important physiological regulator of fibrinolysis, extracellular matrix homeostasis, and cell motility. Recent observations show that PAI-1 may also be implicated in maintaining integrity of cells, especially with respect to cellular proliferation or apoptosis. In the present study we provide evidence that PAI-1 interacts with proteasome and affects its activity. First, by using the yeast two-hybrid system, we found that the α3 subunit of proteasome directly interacts with PAI-1. Then, to ensure that the PAI-1-proteasome complex is formed in vivo, both proteins were coimmunoprecipitated from endothelial cells and identified with specific antibodies. The specificity of this interaction was evidenced after transfection of HeLa cells with pCMV-PAI-1 and coimmunoprecipitation of both proteins with anti-PAI-1 antibodies. Subsequently, cellular distribution of the PAI-1-proteasome complexes was established by immunogold staining and electron microscopy analyses. Both proteins appeared in a diffuse cytosolic pattern but also could be found in a dense perinuclear and nuclear location. Furthermore, PAI-1 induced formation of aggresomes freely located in endothelial cytoplasm. Increased PAI-1 expression abrogated degradation of degron analyzed after cotransfection of HeLa cells with pCMV-PAI-1 and pd2EGFP-N1 and prevented degradation of p53 as well as IκBα, as evidenced both by confocal microscopy and Western immunoblotting.

  1. Genetic variations of glycinin subunit genes among cultivated and wild type soybean species

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Glycinin is a predominant storage protein in most soybean accessions. It is a hexamer constituted by five major subunits, which can be classified into two groups. Group Ⅰ contains Gl, G2 and G3, and Group Ⅱ contains G4 and G5. The genes encoding these subunits have been designated from Gyl to Gy5, respectively. In the present study, Gyl genomic fragments were cloned from wild accessions of subgenera Glycine glycine, Glycine soja and a cultivar of Glycine max. Their sequences and the deduced amino acid sequences were compared. The residues critical for assembling of G1 subunits from the wild perennial accession were conservative. The Gy4 fragments were cloned from two wild perennial accessions and compared with that from subgenus Soja. The intron 3 of Gy4 had abundant variations between the subgenera G. Soja and G. Glycine as well as within the subgenus G. Glycine. Abundant variations existed in the disordered regions 3 and 4 of G4 subunits from two wild perennial accessions. The genomic organization of glycinin genes was analyzed in 19 accessions from subgenera Soja and Glycine. The hybridization patterns were identical among the accessions of subgenus Soja. On the contrary, abundant polymorphisms existed between the accessions from subgenus Glycine. These results indicated that glycinin genes have high degree of conservation within subgenus Soja but more variations within subgenus Glycine.

  2. Identification of the alternative spliced form of the alpha 2/delta subunit of voltage sensitive Ca2+ channels expressed in PC12 cells.

    Science.gov (United States)

    Gilad, B; Shenkar, N; Halevi, S; Trus, M; Atlas, D

    1995-07-07

    The alpha 2/delta subunit of voltage sensitive Ca2+ channels expressed in PC12 has been cloned and partially sequenced. The message observed in Northern blot analysis displays a 7.5 kb transcript, identical in size to mRNA of rabbit skeletal muscle and rat brain. The nucleotide sequence of the cloned alpha 2 subunit of the PC12 specific cDNA is > 99% identical to rat brain sequence and 85% to skeletal muscle. Reverse-transcriptase-polymerase chain reaction (RT-PCR) of the alternative splicing region identifies two deleted regions of 57 bp and 21 bp in PC12 expressed alpha 2/delta transcript. The alternative variant alpha 2e of alpha 2/delta subunit which is expressed in PC12 cells was previously identified in human embryonic kidney (HEK293) cells. RT-PCR analysis show two different sized alternative PCR fragments in rat lung and none in rat spleen, kidney and intestine. Antibodies prepared against a 19 amino acid peptide within the alternative spliced region effectively inhibits [3H]dopamine release in PC12 cells. This implies that the alternatively spliced region is positioned extracellularly and is involved in regulation of the L-type Ca2+ channel-mediated transmitter release.

  3. Glutathione S-transferase Ya subunit gene: identification of regulatory elements required for basal level and inducible expression.

    OpenAIRE

    Telakowski-Hopkins, C A; King, R. G.; Pickett, C B

    1988-01-01

    The function of the 5'-flanking region of a rat glutathione S-transferase Ya subunit structural gene has been examined in homologous and heterologous cells. By using the 5'-flanking region of the Ya subunit gene fused to the structural gene encoding chloramphenicol acetyltransferase, we have identified two cis-acting regulatory elements in the upstream region of the Ya gene. One element is required for maximum basal level expression in homologous cells, whereas maximum basal level expression ...

  4. A remarkably stable TipE gene cluster: evolution of insect Para sodium channel auxiliary subunits

    Directory of Open Access Journals (Sweden)

    Li Jia

    2011-11-01

    Full Text Available Abstract Background First identified in fruit flies with temperature-sensitive paralysis phenotypes, the Drosophila melanogaster TipE locus encodes four voltage-gated sodium (NaV channel auxiliary subunits. This cluster of TipE-like genes on chromosome 3L, and a fifth family member on chromosome 3R, are important for the optional expression and functionality of the Para NaV channel but appear quite distinct from auxiliary subunits in vertebrates. Here, we exploited available arthropod genomic resources to trace the origin of TipE-like genes by mapping their evolutionary histories and examining their genomic architectures. Results We identified a remarkably conserved synteny block of TipE-like orthologues with well-maintained local gene arrangements from 21 insect species. Homologues in the water flea, Daphnia pulex, suggest an ancestral pancrustacean repertoire of four TipE-like genes; a subsequent gene duplication may have generated functional redundancy allowing gene losses in the silk moth and mosquitoes. Intronic nesting of the insect TipE gene cluster probably occurred following the divergence from crustaceans, but in the flour beetle and silk moth genomes the clusters apparently escaped from nesting. Across Pancrustacea, TipE gene family members have experienced intronic nesting, escape from nesting, retrotransposition, translocation, and gene loss events while generally maintaining their local gene neighbourhoods. D. melanogaster TipE-like genes exhibit coordinated spatial and temporal regulation of expression distinct from their host gene but well-correlated with their regulatory target, the Para NaV channel, suggesting that functional constraints may preserve the TipE gene cluster. We identified homology between TipE-like NaV channel regulators and vertebrate Slo-beta auxiliary subunits of big-conductance calcium-activated potassium (BKCa channels, which suggests that ion channel regulatory partners have evolved distinct lineage

  5. Conformational stability analyses of alpha subunit I domain of LFA-1 and Mac-1.

    Directory of Open Access Journals (Sweden)

    Debin Mao

    Full Text Available β₂ integrin of lymphocyte function-associated antigen-1 (LFA-1 or macrophage-1 antigen (Mac-1 binds to their common ligand of intercellular adhesion molecule-1 (ICAM-1 and mediates leukocyte-endothelial cell (EC adhesions in inflammation cascade. Although the two integrins are known to have distinct functions, the corresponding micro-structural bases remain unclear. Here (steered-molecular dynamics simulations were employed to elucidate the conformational stability of α subunit I domains of LFA-1 and Mac-1 in different affinity states and relevant I domain-ICAM-1 interaction features. Compared with low affinity (LA Mac-1, the LA LFA-1 I domain was unstable in the presence or absence of ICAM-1 ligand, stemming from diverse orientations of its α₇-helix with different motifs of zipper-like hydrophobic junction between α₁- and α₇-helices. Meanwhile, spontaneous transition of LFA-1 I domain from LA state to intermediate affinity (IA state was first visualized. All the LA, IA, and high affinity (HA states of LFA-1 I domain and HA Mac-1 I domain were able to bind to ICAM-1 ligand effectively, while LA Mac-1 I domain was unfavorable for binding ligand presumably due to the specific orientation of S144 side-chain that capped the MIDAS ion. These results furthered our understanding in correlating the structural bases with their functions of LFA-1 and Mac-1 integrins from the viewpoint of I domain conformational stability and of the characteristics of I domain-ICAM-1 interactions.

  6. Gyrase activity and number of copies of the gyrase B subunit gene in Haemophilus influenzae

    Energy Technology Data Exchange (ETDEWEB)

    Cabrera-Juarez, E.; Setlow, J.K.

    1985-11-01

    Gyrase activities in extracts of various strains of Haemophilus influenzae can differ by more than an order of magnitude. Measurements of in vitro activity and copy number indicated that most of these differences arose from variations in the number of copies of the gene for the gyrase B subunit, with some strains containing multicopy plasmids coding for that subunit. The quantitative relationship between gyrase and copy number depended on the mutations in the plasmids and in the host. The possibility that the in vivo gyrase activity did not reflect the in vitro data was explored by measurement of alkaline phosphatase and ATPase activity in the extracts. Alkaline phosphatase activity increased with increasing gyrase activity measured in vitro, but ATPase activity did not. The authors conclude that extra supercoiling enhanced transcription of the alkaline phosphatase gene but not the ATPase gene and that it is unlikely that there is much discrepancy between gyrase activity assayed in vitro and the activity in the cell.

  7. Conservation of the Nrf2-Mediated Gene Regulation of Proteasome Subunits and Glucose Metabolism in Zebrafish

    Directory of Open Access Journals (Sweden)

    Vu Thanh Nguyen

    2016-01-01

    Full Text Available The Keap1-Nrf2 system is an evolutionarily conserved defense mechanism against oxidative and xenobiotic stress. Besides the exogenous stress response, Nrf2 has been found to regulate numerous cellular functions, including protein turnover and glucose metabolism; however, the evolutionary origins of these functions remain unknown. In the present study, we searched for novel target genes associated with the zebrafish Nrf2 to answer this question. A microarray analysis of zebrafish embryos that overexpressed Nrf2 revealed that 115 candidate genes were targets of Nrf2, including genes encoding proteasome subunits and enzymes involved in glucose metabolism. A real-time quantitative PCR suggested that the expression of 3 proteasome subunits (psma3, psma5, and psmb7 and 2 enzymes involved in glucose metabolism (pgd and fbp1a were regulated by zebrafish Nrf2. We thus next examined the upregulation of these genes by an Nrf2 activator, diethyl maleate, using Nrf2 mutant zebrafish larvae. The results of real-time quantitative PCR and whole-mount in situ hybridization showed that all of these 5 genes were upregulated by diethyl maleate treatment in an Nrf2-dependent manner, especially in the liver. These findings implied that the Nrf2-mediated regulation of the proteasome subunits and glucose metabolism is evolutionarily conserved among vertebrates.

  8. Small angle X-ray scattering of wheat seed-storage proteins: alpha-, gamma- and omega-gliadins and the high molecular weight (HMW) subunits of glutenin.

    Science.gov (United States)

    Thomson, N H; Miles, M J; Popineau, Y; Harries, J; Shewry, P; Tatham, A S

    1999-03-19

    Small angle X-ray scattering in solution was performed on seed-storage proteins from wheat. Three different groups of gliadins (alpha-, gamma- and omega-) and a high molecular weight (HMW) subunit of glutenin (1Bx20) were studied to determine molecular size parameters. All the gliadins could be modelled as prolate ellipsoids with extended conformations. The HMW subunit existed as a highly extended rod-like particle in solution with a length of about 69 nm and a diameter of about 6.4 nm. Specific aggregation effects were observed which may reflect mechanisms of self-assembly that contribute to the unique viscoelastic properties of wheat dough.

  9. Drosophila casein kinase I alpha regulates homolog pairing and genome organization by modulating condensin II subunit Cap-H2 levels.

    Science.gov (United States)

    Nguyen, Huy Q; Nye, Jonathan; Buster, Daniel W; Klebba, Joseph E; Rogers, Gregory C; Bosco, Giovanni

    2015-01-01

    The spatial organization of chromosomes within interphase nuclei is important for gene expression and epigenetic inheritance. Although the extent of physical interaction between chromosomes and their degree of compaction varies during development and between different cell-types, it is unclear how regulation of chromosome interactions and compaction relate to spatial organization of genomes. Drosophila is an excellent model system for studying chromosomal interactions including homolog pairing. Recent work has shown that condensin II governs both interphase chromosome compaction and homolog pairing and condensin II activity is controlled by the turnover of its regulatory subunit Cap-H2. Specifically, Cap-H2 is a target of the SCFSlimb E3 ubiquitin-ligase which down-regulates Cap-H2 in order to maintain homologous chromosome pairing, chromosome length and proper nuclear organization. Here, we identify Casein Kinase I alpha (CK1α) as an additional negative-regulator of Cap-H2. CK1α-depletion stabilizes Cap-H2 protein and results in an accumulation of Cap-H2 on chromosomes. Similar to Slimb mutation, CK1α depletion in cultured cells, larval salivary gland, and nurse cells results in several condensin II-dependent phenotypes including dispersal of centromeres, interphase chromosome compaction, and chromosome unpairing. Moreover, CK1α loss-of-function mutations dominantly suppress condensin II mutant phenotypes in vivo. Thus, CK1α facilitates Cap-H2 destruction and modulates nuclear organization by attenuating chromatin localized Cap-H2 protein.

  10. Cross-linking of the delta subunit to one of the three alpha subunits has no effect on functioning, as expected if delta is a part of the stator that links the F1 and F0 parts of the Escherichia coli ATP synthase.

    Science.gov (United States)

    Ogilvie, I; Aggeler, R; Capaldi, R A

    1997-06-27

    A mutant of the Escherichia coli F1F0-ATPase has been generated (alphaQ2C) in which the glutamine at position 2 of the alpha subunit has been replaced with a cysteine residue. Cu2+ treatment of ECF1 from this mutant cross-linked an alpha subunit to the delta subunit in high yield. Two different sites of disulfide bond formation were involved, i.e. between Cys90 (or the closely spaced Cys47) of alpha with Cys140 of delta, and between Cys2 of alpha and Cys140 of delta. Small amounts of other cross-linked products, including alpha-alpha, delta internal, and alpha-alpha-delta were obtained. In ECF1F0, there was no cross-linking between the intrinsic Cys of alpha and Cys140. Instead, the product generated between Cys2 of alpha and Cys140 of delta was obtained at near 90% yield. Small amounts of alpha-alpha and delta internal were present, and under high Cu2+ concentrations, alpha-alpha-delta was also formed. The ATPase activity of ECF1 and ECF1F0 was not significantly affected by the presence of these cross-links. When Cys140 of delta was first modified with N-ethylmaleimide in ECF1F0, an alpha-delta cross-link was still produced, although in lower yield, between Cys64 of delta and Cys2 of alpha. ATP hydrolysis-linked proton pumping of inner membranes from the mutant alpha2QC was only marginally affected by cross-linking of the alpha to the delta subunit. These results indicate that Cys140 and Cys64 of the delta subunit and Cys2 of the alpha subunit are in close proximity. This places the delta subunit near the top of the alpha-beta hexagon and not in the stalk region. As fixing the delta to the alpha by cross-linking does not greatly impair either the ATPase function of the enzyme, or coupled proton translocation, we argue that the delta subunit forms a portion of the stator linking F1 to F0.

  11. GABA{sub A} receptor beta 3 subunit gene is possibly paternally imprinted in humans

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1994-02-15

    As the gene for GABA{sub A} receptor beta 3 subunit (GABRB3) is encompassed by a small molecular deletion in chromosome 15q11-q13, which is the critical region for Angelman syndrome(AS), the GABRB3 gene could be a candidate gene for AS. The abnormal phenotype of AS is manifested only when the deletion is inherited from the mother, not from the father. Therefore, a candidate gene for AS should be paternally imprinted. Although it was reported that the GABRB3 gene was expressed equally from either the maternal or paternal chromosome in mouse brain (i.e., not imprinted), it is well known that imprinting shows tissue specificity, and it remains to be determined if all genes imprinted in the mouse are also imprinted in humans. 4 refs., 1 fig.

  12. The human thyrotropin beta-subunit gene differs in 5' structure from murine TSH-beta genes.

    Science.gov (United States)

    Guidon, P T; Whitfield, G K; Porti, D; Kourides, I A

    1988-12-01

    The gene encoding the beta-subunit of human thyrotropin (hTSH-beta) was isolated, and its nucleotide sequence was determined. The gene is 4.3 kb in length, consists of three exons and two introns, and is present as a single copy as determined by Southern blot analysis of total genomic DNA. The protein coding portion of the gene, which includes exons 2 and 3, was isolated from a human genomic phage library, while exon 1, which encodes only 5' untranslated mRNA sequence, was isolated from a plasmid library of size-selected genomic DNA fragments. Here we describe the isolation of the 5' untranslated exon of the hTSH-beta subunit and 5'-flanking region. The structure of the hTSH-beta gene is very similar to the previously characterized TSH-beta genes from mouse and rat. The genes from all three species have two distinct promoter regions, but while both promoters are utilized by the murine TSH-beta genes, the human TSH-beta gene apparently utilizes only the proximal promoter for transcription initiation. A striking difference in hTSH-beta gene structure compared to the murine genes is that exon 1 of the human gene is 36 nucleotides. An analysis of the mouse, rat, and human exon 1 and 5'-flanking region shows a high percentage of sequence homology, with the exception of a 9-nucleotide insertion 13 bases 3' from the proximal TATA box found in the human gene but not found in the other two species. We propose that this insertion results in the additional length of human exon 1 compared to the mouse and rat genes. By isolating the promoter region of the hTSH-beta gene, we can begin to identify specific sequences involved in the regulation of hTSH gene expression.

  13. Biosensor analysis of dynamics of interleukin 5 receptor subunit beta(c) interaction with IL5:IL5R(alpha) complexes.

    Science.gov (United States)

    Scibek, Jeffery J; Evergren, Emma; Zahn, Stefan; Canziani, Gabriela A; Van Ryk, Donald; Chaiken, Irwin M

    2002-08-15

    To gain insight into IL5 receptor subunit recruitment mechanism, and in particular the experimentally elusive pathway for assembly of signaling subunit beta(c), we constructed a soluble beta(c) ectodomain (s(beta)(c)) and developed an optical biosensor assay to measure its binding kinetics. Functionally active s(beta)(c) was anchored via a C-terminal His tag to immobilized anti-His monoclonal antibodies on the sensor surface. Using this surface, we quantitated for the first time direct binding of s(beta)(c) to IL5R(alpha) complexed to either wild-type or single-chain IL5. Binding was much weaker if at all with either R(alpha) or IL5 alone. Kinetic evaluation revealed a moderate affinity (0.2-1 microM) and relatively fast off rate for the s(beta)(c) interaction with IL5:R(alpha) complexes. The data support a model in which beta(c) recruitment occurs with preformed IL5:R(alpha) complex. Dissociation kinetics analysis suggests that the IL5-alpha-beta(c) complex is relatively short-lived. Overall, this study solidifies a model of sequential recruitment of receptor subunits by IL5, provides a novel biosensor binding assay of beta(c) recruitment dynamics, and sets the stage for more advanced characterization of the roles of structural elements within R(alpha), beta(c), and cytokines of the IL5/IL3/GM-CSF family in receptor recruitment and activation.

  14. [Altered expression of L-type calcium channel alpha1C and alpha1D subunits in colon of rats with diarrhea-predominant irritable bowel syndrome].

    Science.gov (United States)

    Zhu, Jie; Luo, He-Sheng; Chen, Ling; Zhou, Ting

    2009-10-20

    To investigate the molecular identities of L-type calcium channel alpha1C subunit (Cav1.2) and alpha1D subunit (Cav1.3) responsible for motor dysfunction of diarrhea-predominant irritable bowel syndrome (D-IBS). A total of 30 male Wistar rats were randomly divided into two groups. The traditional method for irritable bowel syndrome in a cold environment and intragastric administration of Folium Cassiae were combined to develop the D-IBS model. The fecal particles of rats and the water content in feces were measured. Then the expression of Cav1.2 and Cav1.3 mRNA was detected by reverse transcription polymerase chain reaction. The expressions of Cav1.2 and Cav1.3 were examined by immunohistochemistry in colonic tissues from D-IBS model rats and matched tissues. The fecal particles and the water content in feces of D-IBS model rats significantly increased as compared with the normal rats (6.8 +/- 1.4 vs 3.2 +/- 0.8, P = 0.032, 80% +/- 4% vs 47% +/- 5%, P = 0.018). Cav1.2 and Cav1.3 were positively expressed in colon of both model group and control group rats. The immunohistochemical scores of Cav1.2 and Cav1.3 expression increased in colon of D-IBS model rats as compared with those in normal control rats (3.43 +/- 0.92 vs 2.82 +/- 0.60, P = 0.034, 4.32 +/- 0.51 vs 3.75 +/- 1.05, P = 0.039). The immunohistochemical scores of Cav1.3 expression were significantly higher than Cav1.2 in colon of both two group rats (P = 0.003, 0.005). Similarly, the expression of Cav1.2 and Cav1.3 mRNA increased in colon of D-IBS model rats as compared with those in normal control rats (1.18 +/- 0.15 vs 1.06 +/- 0.12, P = 0.023, 1.32 +/- 0.13 vs 1.23 +/- 0.13, P = 0.033). The expression of Cav1.3 mRNA was significantly higher than Cav1.2 in colon of both two group rats (P = 0.038, 0.012). The traditional modeling of irritable bowel syndrome in rats alters the expression of Cav1.2 and Cav1.3. It may be directly related to the generation of enhanced colonic contraction in D-IBS. In addition

  15. Mobilities of the inner three core residues and the Man(alpha 1--6) branch of the glycan at Asn78 of the alpha-subunit of human chorionic gonadotropin are restricted by the protein.

    Science.gov (United States)

    van Zuylen, C W; de Beer, T; Leeflang, B R; Boelens, R; Kaptein, R; Kamerling, J P; Vliegenthart, J F

    1998-02-17

    Human chorionic gonadotropin (hCG) is a heterodimeric glycoprotein hormone involved in the maintenance of the corpus luteum in early pregnancy. The free alpha-subunit of hCG has a biological activity of its own, namely, stimulation of prolactin secretion from term pregnancy decidual cells [Blithe, D. L., et al. (1991) Endocrinology 129, 2257-2259]. Glycosylation at Asn78 of the alpha-subunit is required for the stability of the protein, but the exact nature of the stabilizing effect is not known. In our previous study, it was indicated that GlcNAc-1 at Asn78 has a reduced mobility, whereas the glycan at Asn52 is highly mobile [De Beer, T., et al. (1996) Eur. J. Biochem. 241, 229-242]. In the present investigation, it is shown that the PNGase F susceptibility of the Asn52-linked glycan in the free alpha-subunit is absent in the heterodimer. Thus, the high mobility of the glycan at Asn52 may be characteristic for the free alpha-subunit. For accurate modeling of alpha hCG, knowledge of the behavior of each of the glycans is essential. In this context, the mobility of the glycans and their interactions with the protein are explored by NMR spectroscopy using desialylated, partially deglycosylated free alpha-subunit (as-pd alpha) carrying glycans at Asn78 only. NOEs between GlcNAc-2 and several amino acid residues indicate that GlcNAc-2 is involved in stabilizing alpha hCG. From the values of 13C relaxation parameters T2 and T1 rho of the constituting monosaccharide residues, it was concluded that the inner three residues have a severely restricted mobility. The Man-4 and Man-4' residues of the diantennary oligosaccharide exhibit a similar relaxation behavior, suggesting that the Man-4' branch occurs in a single conformation of the C5-C6 linkage of Man-3 instead of in rapidly interconverting conformations that are known to exist for this linkage for the free oligosaccharide.

  16. Cloning and characterization of the rat HIF-1 alpha prolyl-4-hydroxylase-1 gene.

    Science.gov (United States)

    Cobb, Ronald R; McClary, John; Manzana, Warren; Finster, Silke; Larsen, Brent; Blasko, Eric; Pearson, Jennifer; Biancalana, Sara; Kauser, Katalin; Bringmann, Peter; Light, David R; Schirm, Sabine

    2005-08-01

    Prolyl-4-hydroxylase domain-containing enzymes (PHDs) mediate the oxygen-dependent regulation of the heterodimeric transcription factor hypoxia-inducible factor-1 (HIF-1). Under normoxic conditions, one of the subunits of HIF-1, HIF-1alpha, is hydroxylated on specific proline residues to target HIF-1alpha for degradation by the ubiquitin-proteasome pathway. Under hypoxic conditions, the hydroxylation by the PHDs is attenuated by lack of the oxygen substrate, allowing HIF-1 to accumulate, translocate to the nucleus, and mediate HIF-mediated gene transcription. In several mammalian species including humans, three PHDs have been identified. We report here the cloning of a full-length rat cDNA that is highly homologous to the human and murine PHD-1 enzymes and encodes a protein that is 416 amino acids long. Both cDNA and protein are widely expressed in rat tissues and cell types. We demonstrate that purified and crude baculovirus-expressed rat PHD-1 exhibits HIF-1alpha specific prolyl hydroxylase activity with similar substrate affinities and is comparable to human PHD-1 protein.

  17. Wheat and barley allergens associated with baker's asthma. Glycosylated subunits of the alpha-amylase-inhibitor family have enhanced IgE-binding capacity.

    Science.gov (United States)

    Sanchez-Monge, R; Gomez, L; Barber, D; Lopez-Otin, C; Armentia, A; Salcedo, G

    1992-01-15

    A 16 kDa protein, designated CM16*, which strongly binds IgE from baker's-asthma patients has been identified as a glycosylated form of the previously reported WTAI-CM16, which is a subunit of the wheat tetrameric alpha-amylase inhibitor. A glycosylated form (CMb*) of BTAI-CMb, the equivalent inhibitor subunit from barley, has been also found to have significantly enhanced IgE-binding capacity. In all, 14 purified members of the alpha-amylase/trypsin-inhibitor family showed very different IgE-binding capacities when tested by a dot-blot assay. The glycosylated components CM16*, CMb* and the previously described non-glycosylated 14.5 kDa allergen from barley (renamed BMAI-1) were found to be the strongest allergens.

  18. Further studies on the covalent crosslinking of thyrotropin to its receptor: evidence that both the alpha and beta subunits of thyrotropin are crosslinked to the receptor.

    Science.gov (United States)

    McQuade, R; Thomas, C G; Nayfeh, S N

    1987-02-01

    Highly purified alpha- and beta-subunits of thyrotropin were individually radioiodinated and, subsequently, recombined with their unlabeled complementary subunits. This procedure resulted in the formation of [125I]thyrotropin(TSH) hybrid molecules which were labeled on only one hormone subunit. Characterization of the binding properties of these two hybrid molecules demonstrated that both yielded nonlinear Scatchard plots with Kd and Bmax values similar to those obtained with radioiodinated native TSH and that both were capable of interaction with the high- and low-affinity binding components of the TSH receptor. The recombined [125I]TSH molecules were then crosslinked to the TSH receptor using disuccinimidyl suberate. Following electrophoresis and autoradiography, two labeled TSH-receptor complexes with Mr of 68,000 and 80,000 were observed. These two complexes exhibited hormone specificity and electrophoretic mobility identical to those previously observed using native [125I]TSH. Crosslinking with increasing concentrations of disuccinimidyl suberate suggested that the formation of the 68,000 and 80,000 complexes was sequential with the 68,000 appearing before the 80,000. Furthermore, the two bands were labeled regardless of which TSH subunit of the hybrid TSH was radioiodinated. These data strongly suggest that the 68,000 and 80,000 TSH-receptor complexes are the result of crosslinking to the TSH alpha-beta dimer and not to one subunit in the case of the 68,000 complex and to the TSH alpha-beta dimer in the case of the 80,000 complex, as had been hypothesized previously.

  19. Characterization of a novel monoclonal antibody with restricted specificity to the free beta 2 integrin alpha M CD11b subunit.

    Science.gov (United States)

    Tanfous, Naouel Guedel-Ben; Essafi, Makram; Larguech, Beya; Barbouche, Ridha; Fathallah, Dahmani M

    2007-12-01

    Leukocyte cell surface expression and function of beta2 integrins require the intracellular association of alpha subunits, CD11a, b, c, d, respectively, with the common CD18 beta2 subunit. We have raised and characterized a murine MAb -- ME-MDF -- directed against the low affinity form of the human integrin alphaM subunit CD11b A-domain. MAb ME-MDF is an IgG2a that has a kDa of 2,45461 +/- 0.12 x 10(-9) M. MAb ME-MDF recognizes both the low and high affinity forms of the CD11b A-domain. Flow cytometry showed that ME-MDF does not recognize the heterodimeric CD11b/CD18 molecule at the surface of polymorphonuclear cells and the human monoblast cell line U937. Western blot analysis of U937 cell line cell surface proteins demonstrated that ME-MDF reacts specifically with the CD11b subunit but does not react with the heterodimeric CD11b/CD18 complex, a feature that differentiates it from other CD11b A-dom-specific MAbs. These observations suggest that ME-MDF recognizes an epitope that is involved in the association of the two subunits and hence is not accessible within the heterodimeric form of the CD11b/CD18 molecule. These data show that the CD11b A-dom engages not only the MIDAS but also the ME-MDF-specific epitope to associate with the CD18 subunit. We have also constructed, and expressed in the yeast Pichia pastoris, the corresponding recombinant scFv form of MAb ME-MDF and characterized the CDRs. MAb ME-MDF is characterized by short VH and VL CDR3. MAb ME-MDF and/or its recombinant scFv form would be very useful to study the structural basis of the association between the alpha and beta2 integrin subunits and to investigate the possibility of modulating CR3 cell surface expression by preventing subunit association.

  20. Dopaminergic modulation of sodium current in hippocampal neurons via cAMP-dependent phosphorylation of specific sites in the sodium channel alpha subunit.

    Science.gov (United States)

    Cantrell, A R; Smith, R D; Goldin, A L; Scheuer, T; Catterall, W A

    1997-10-01

    Phosphorylation of brain Na+ channel alpha subunits by cAMP-dependent protein kinase (PKA) decreases peak Na+ current in cultured brain neurons and in mammalian cells and Xenopus oocytes expressing cloned brain Na+ channels. We have studied PKA regulation of Na+ channel function by activation of D1-like dopamine receptors in acutely isolated hippocampal neurons using whole-cell voltage-clamp recording techniques. The D1 agonist SKF 81297 reversibly reduced peak Na+ current in a concentration-dependent manner. No changes in the voltage dependence or kinetics of activation or inactivation were observed. This effect was mediated by PKA, as it was mimicked by application of the PKA activator Sp-5, 6-dichloro-1-beta-D-ribofuranosylbenzimidazole-3', 5'-monophosphorothioate(cBIMPS) and was inhibited by the specific PKA inhibitor peptide PKAI5-24. cBIMPS had similar effects on type IIA brain Na+ channel alpha subunits expressed in tsA-201 cells, but no effect was observed on a mutant Na+ channel alpha subunit in which serine residues in five PKA phosphorylation sites in the intracellular loop connecting domains I and II (LI-II) had been replaced by alanine. A single mutation, S573A, similarly eliminated cBIMPS modulation. Thus, activation of D1-like dopamine receptors results in PKA-dependent phosphorylation of specific sites in LI-II of the Na+ channel alpha subunit, causing a reduction in Na+ current. Such modulation is expected to exert a profound influence on overall neuronal excitability. Dopaminergic input to the hippocampus from the mesocorticolimbic system may exert this influence in vivo.

  1. Alpha-subunit positions methionine 180 and glutamate 214 of Pseudomonas stutzeri OX1 toluene-o-xylene monooxygenase influence catalysis.

    Science.gov (United States)

    Vardar, Gönül; Wood, Thomas K

    2005-02-01

    Alpha-subunit position M180 of toluene-o-xylene monooxygenase influences the regiospecific oxidation of aromatics (e.g., from o-cresol, M180H forms 3-methylcatechol, methylhydroquinone, and 4-methylresorcinol, whereas the wild type forms only 3-methylcatechol). Position E214 influences the rate of reaction (e.g., E214G increases p-nitrophenol oxidation 15-fold) by controlling substrate entrance and product efflux as a gate residue.

  2. Reactions of a fluorescent ATP analog, 2'-(5-dimethyl-aminonaphthalene-1-sulfonyl) amino-2'-deoxyATP, with E. coli F1-ATPase and its subunits: the roles of the high affinity binding site in the alpha subunit and the low affinity binding site in the beta subunit.

    Science.gov (United States)

    Matsuoka, I; Takeda, K; Futai, M; Tonomura, Y

    1982-11-01

    We performed kinetic studies on the reactions of a fluorescent ATP analog, 2'-(5-dimethyl-aminonaphthalene-1-sulfonyl) amino-2'-deoxyATP (DNS-ATP), with E. coli F1-ATPase (EF1) and its subunits, to clarify the role of each subunit in the ATPase reaction. The following results were obtained. 1. One mol of EF1, which contains nonexchangeable 2 mol ATP and 0.5 mol ADP, binds 3 mol of DNS-ATP. The apparent dissociation constant, in the presence of Mg2+, was 0.23 microM. Upon binding, the fluorescence intensity of DNS-ATP at 520 nm increased exponentially with t1/2 of 35 s, and reached 3.5 times the original fluorescence level. Following the fluorescence increase, DNS-ATP was hydrolyzed, and the fluorescence intensity maintained its enhanced level. 2. The addition of an excess of ATP over the EF1-DNS-nucleotide complex, in the presence of Mg2+, decreased the fluorescence intensity rapidly, indicating the acceleration of DNS-nucleotide release from EF1. ADP and GTP also decreased the fluorescence intensity. 3. DCCD markedly inhibited the accelerating effect of ATP on DNS-nucleotide release from EF1 and the EF1-DNS-ATPase or -ATPase activity in a steady state. On the other hand, DCCD only slightly inhibited the fluorescence increase of DNS-ATP, due to its binding to EF1, and the rate of single cleavage of 1 mol of DNS-ATP per mol of alpha subunit of EF1. 4. In the presence of Mg2+, 0.65-0.82 mol of DNS-ATP binds to 1 mol of the isolated alpha subunit of EF1 with an apparent dissociation constant of 0.06-0.07 microM. Upon binding, the fluorescence intensity of DNS-ATP at 520 nm increased 1.55 fold very rapidly (t1/2 less than 1 s). No hydrolysis of DNS-ATP was observed upon the addition of the isolated alpha subunit. The fluorescence intensity of DNS-ATP was unaffected by the addition of the isolated beta subunit. DNS-ATP was also unhydrolyzed by the isolated beta subunit. 5. EF1-ATPase was reconstituted from alpha, beta, and gamma subunits in the presence of Mg2+ and ATP

  3. Genetic differentiation of the mitochondrial cytochrome oxidase C subunit I gene in genus Paramecium (Protista, Ciliophora.

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    Yan Zhao

    Full Text Available BACKGROUND: The mitochondrial cytochrome c oxidase subunit I (COI gene is being used increasingly for evaluating inter- and intra-specific genetic diversity of ciliated protists. However, very few studies focus on assessing genetic divergence of the COI gene within individuals and how its presence might affect species identification and population structure analyses. METHODOLOGY/PRINCIPAL FINDINGS: We evaluated the genetic variation of the COI gene in five Paramecium species for a total of 147 clones derived from 21 individuals and 7 populations. We identified a total of 90 haplotypes with several individuals carrying more than one haplotype. Parsimony network and phylogenetic tree analyses revealed that intra-individual diversity had no effect in species identification and only a minor effect on population structure. CONCLUSIONS: Our results suggest that the COI gene is a suitable marker for resolving inter- and intra-specific relationships of Paramecium spp.

  4. Genetic differentiation of the mitochondrial cytochrome oxidase C subunit I gene in genus Paramecium (Protista, Ciliophora).

    Science.gov (United States)

    Zhao, Yan; Gentekaki, Eleni; Yi, Zhenzhen; Lin, Xiaofeng

    2013-01-01

    The mitochondrial cytochrome c oxidase subunit I (COI) gene is being used increasingly for evaluating inter- and intra-specific genetic diversity of ciliated protists. However, very few studies focus on assessing genetic divergence of the COI gene within individuals and how its presence might affect species identification and population structure analyses. We evaluated the genetic variation of the COI gene in five Paramecium species for a total of 147 clones derived from 21 individuals and 7 populations. We identified a total of 90 haplotypes with several individuals carrying more than one haplotype. Parsimony network and phylogenetic tree analyses revealed that intra-individual diversity had no effect in species identification and only a minor effect on population structure. Our results suggest that the COI gene is a suitable marker for resolving inter- and intra-specific relationships of Paramecium spp.

  5. Peroxisome proliferator-activated receptor alpha target genes.

    Science.gov (United States)

    Rakhshandehroo, Maryam; Knoch, Bianca; Müller, Michael; Kersten, Sander

    2010-01-01

    The peroxisome proliferator-activated receptor alpha (PPARα) is a ligand-activated transcription factor involved in the regulation of a variety of processes, ranging from inflammation and immunity to nutrient metabolism and energy homeostasis. PPARα serves as a molecular target for hypolipidemic fibrates drugs which bind the receptor with high affinity. Furthermore, PPARα binds and is activated by numerous fatty acids and fatty acid-derived compounds. PPARα governs biological processes by altering the expression of a large number of target genes. Accordingly, the specific role of PPARα is directly related to the biological function of its target genes. Here, we present an overview of the involvement of PPARα in lipid metabolism and other pathways through a detailed analysis of the different known or putative PPARα target genes. The emphasis is on gene regulation by PPARα in liver although many of the results likely apply to other organs and tissues as well.

  6. Peroxisome Proliferator-Activated Receptor Alpha Target Genes

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    Maryam Rakhshandehroo

    2010-01-01

    Full Text Available The peroxisome proliferator-activated receptor alpha (PPARα is a ligand-activated transcription factor involved in the regulation of a variety of processes, ranging from inflammation and immunity to nutrient metabolism and energy homeostasis. PPARα serves as a molecular target for hypolipidemic fibrates drugs which bind the receptor with high affinity. Furthermore, PPARα binds and is activated by numerous fatty acids and fatty acid-derived compounds. PPARα governs biological processes by altering the expression of a large number of target genes. Accordingly, the specific role of PPARα is directly related to the biological function of its target genes. Here, we present an overview of the involvement of PPARα in lipid metabolism and other pathways through a detailed analysis of the different known or putative PPARα target genes. The emphasis is on gene regulation by PPARα in liver although many of the results likely apply to other organs and tissues as well.

  7. DNA sequence polymorphisms within the bovine guanine nucleotide-binding protein Gs subunit alpha (Gsα-encoding (GNAS genomic imprinting domain are associated with performance traits

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    Mullen Michael P

    2011-01-01

    Full Text Available Abstract Background Genes which are epigenetically regulated via genomic imprinting can be potential targets for artificial selection during animal breeding. Indeed, imprinted loci have been shown to underlie some important quantitative traits in domestic mammals, most notably muscle mass and fat deposition. In this candidate gene study, we have identified novel associations between six validated single nucleotide polymorphisms (SNPs spanning a 97.6 kb region within the bovine guanine nucleotide-binding protein Gs subunit alpha gene (GNAS domain on bovine chromosome 13 and genetic merit for a range of performance traits in 848 progeny-tested Holstein-Friesian sires. The mammalian GNAS domain consists of a number of reciprocally-imprinted, alternatively-spliced genes which can play a major role in growth, development and disease in mice and humans. Based on the current annotation of the bovine GNAS domain, four of the SNPs analysed (rs43101491, rs43101493, rs43101485 and rs43101486 were located upstream of the GNAS gene, while one SNP (rs41694646 was located in the second intron of the GNAS gene. The final SNP (rs41694656 was located in the first exon of transcripts encoding the putative bovine neuroendocrine-specific protein NESP55, resulting in an aspartic acid-to-asparagine amino acid substitution at amino acid position 192. Results SNP genotype-phenotype association analyses indicate that the single intronic GNAS SNP (rs41694646 is associated (P ≤ 0.05 with a range of performance traits including milk yield, milk protein yield, the content of fat and protein in milk, culled cow carcass weight and progeny carcass conformation, measures of animal body size, direct calving difficulty (i.e. difficulty in calving due to the size of the calf and gestation length. Association (P ≤ 0.01 with direct calving difficulty (i.e. due to calf size and maternal calving difficulty (i.e. due to the maternal pelvic width size was also observed at the rs

  8. DNA sequence polymorphisms within the bovine guanine nucleotide-binding protein Gs subunit alpha (Gsα)-encoding (GNAS) genomic imprinting domain are associated with performance traits

    Science.gov (United States)

    2011-01-01

    Background Genes which are epigenetically regulated via genomic imprinting can be potential targets for artificial selection during animal breeding. Indeed, imprinted loci have been shown to underlie some important quantitative traits in domestic mammals, most notably muscle mass and fat deposition. In this candidate gene study, we have identified novel associations between six validated single nucleotide polymorphisms (SNPs) spanning a 97.6 kb region within the bovine guanine nucleotide-binding protein Gs subunit alpha gene (GNAS) domain on bovine chromosome 13 and genetic merit for a range of performance traits in 848 progeny-tested Holstein-Friesian sires. The mammalian GNAS domain consists of a number of reciprocally-imprinted, alternatively-spliced genes which can play a major role in growth, development and disease in mice and humans. Based on the current annotation of the bovine GNAS domain, four of the SNPs analysed (rs43101491, rs43101493, rs43101485 and rs43101486) were located upstream of the GNAS gene, while one SNP (rs41694646) was located in the second intron of the GNAS gene. The final SNP (rs41694656) was located in the first exon of transcripts encoding the putative bovine neuroendocrine-specific protein NESP55, resulting in an aspartic acid-to-asparagine amino acid substitution at amino acid position 192. Results SNP genotype-phenotype association analyses indicate that the single intronic GNAS SNP (rs41694646) is associated (P ≤ 0.05) with a range of performance traits including milk yield, milk protein yield, the content of fat and protein in milk, culled cow carcass weight and progeny carcass conformation, measures of animal body size, direct calving difficulty (i.e. difficulty in calving due to the size of the calf) and gestation length. Association (P ≤ 0.01) with direct calving difficulty (i.e. due to calf size) and maternal calving difficulty (i.e. due to the maternal pelvic width size) was also observed at the rs43101491 SNP. Following

  9. Structure-function of proteins interacting with the alpha1 pore-forming subunit of high voltage-activated calcium channel

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    Alan eNeely

    2014-06-01

    Full Text Available Openings of high-voltage-activated calcium channels lead to a transient increase in calcium concentration that in turn activate a plethora of cellular functions, including muscle contraction, secretion and gene transcription. To coordinate all these responses calcium channels form supramolecular assemblies containing effectors and regulatory proteins that couple calcium influx to the downstream signal cascades and to feedback elements. According to the original biochemical characterization of skeletal muscle Dihydropyridine receptors, high-voltage-activated calcium channels are multi-subunit protein complexes consisting of a pore-forming subunit (α1 associated with four additional polypeptide chains β, α2, δ and γ, often referred to as accessory subunits. Twenty-five years after the first purification of a high-voltage calcium channel, the concept of a flexible stoichiometry to expand the repertoire of mechanisms that regulate calcium channel influx has emerged. Several other proteins have been identified that associate directly with the α1-subunit, including calmodulin and multiple members of the small and large GTPase family. Some of these proteins only interact with a subset of α1-subunits and during specific stages of biogenesis. More strikingly, most of the α1-subunit interacting proteins, such as the β-subunit and small GTPases, regulate both gating and trafficking through a variety of mechanisms. Modulation of channel activity covers almost all biophysical properties of the channel. Likewise, regulation of the number of channels in the plasma membrane is performed by altering the release of the α1-subunit from the endoplasmic reticulum, by reducing its degradation or enhancing its recycling back to the cell surface. In this review, we discuss the structural basis, interplay and functional role of selected proteins that interact with the central pore-forming subunit of high-voltage-activated calcium channels.

  10. Multiple thyrotropin β-subunit and thyrotropin receptor-related genes arose during vertebrate evolution.

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    Gersende Maugars

    Full Text Available Thyroid-stimulating hormone (TSH is composed of a specific β subunit and an α subunit that is shared with the two pituitary gonadotropins. The three β subunits derive from a common ancestral gene through two genome duplications (1R and 2R that took place before the radiation of vertebrates. Analysis of genomic data from phylogenetically relevant species allowed us to identify an additional Tshβ subunit-related gene that was generated through 2R. This gene, named Tshβ2, present in cartilaginous fish, little skate and elephant shark, and in early lobe-finned fish, coelacanth and lungfish, was lost in ray-finned fish and tetrapods. The absence of a second type of TSH receptor (Tshr gene in these species suggests that both TSHs act through the same receptor. A novel Tshβ sister gene, named Tshβ3, was generated through the third genomic duplication (3R that occurred early in the teleost lineage. Tshβ3 is present in most teleost groups but was lostin tedraodontiforms. The 3R also generated a second Tshr, named Tshrb. Interestingly, the new Tshrb was translocated from its original chromosomic position after the emergence of eels and was then maintained in its new position. Tshrb was lost in tetraodontiforms and in ostariophysians including zebrafish although the latter species have two TSHs, suggesting that TSHRb may be dispensable. The tissue distribution of duplicated Tshβs and Tshrs was studied in the European eel. The endocrine thyrotropic function in the eel would be essentially mediated by the classical Tshβ and Tshra, which are mainly expressed in the pituitary and thyroid, respectively. Tshβ3 and Tshrb showed a similar distribution pattern in the brain, pituitary, ovary and adipose tissue, suggesting a possible paracrine/autocrine mode of action in these non-thyroidal tissues. Further studies will be needed to determine the binding specificity of the two receptors and how these two TSH systems are interrelated.

  11. Fragmentation of the large subunit ribosomal RNA gene in oyster mitochondrial genomes

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    Milbury Coren A

    2010-09-01

    Full Text Available Abstract Background Discontinuous genes have been observed in bacteria, archaea, and eukaryotic nuclei, mitochondria and chloroplasts. Gene discontinuity occurs in multiple forms: the two most frequent forms result from introns that are spliced out of the RNA and the resulting exons are spliced together to form a single transcript, and fragmented gene transcripts that are not covalently attached post-transcriptionally. Within the past few years, fragmented ribosomal RNA (rRNA genes have been discovered in bilateral metazoan mitochondria, all within a group of related oysters. Results In this study, we have characterized this fragmentation with comparative analysis and experimentation. We present secondary structures, modeled using comparative sequence analysis of the discontinuous mitochondrial large subunit rRNA genes of the cupped oysters C. virginica, C. gigas, and C. hongkongensis. Comparative structure models for the large subunit rRNA in each of the three oyster species are generally similar to those for other bilateral metazoans. We also used RT-PCR and analyzed ESTs to determine if the two fragmented LSU rRNAs are spliced together. The two segments are transcribed separately, and not spliced together although they still form functional rRNAs and ribosomes. Conclusions Although many examples of discontinuous ribosomal genes have been documented in bacteria and archaea, as well as the nuclei, chloroplasts, and mitochondria of eukaryotes, oysters are some of the first characterized examples of fragmented bilateral animal mitochondrial rRNA genes. The secondary structures of the oyster LSU rRNA fragments have been predicted on the basis of previous comparative metazoan mitochondrial LSU rRNA structure models.

  12. In cellulo examination of a beta-alpha hybrid construct of beta-hexosaminidase A subunits, reported to interact with the GM2 activator protein and hydrolyze GM2 ganglioside.

    Directory of Open Access Journals (Sweden)

    Incilay Sinici

    Full Text Available The hydrolysis in lysosomes of GM2 ganglioside to GM3 ganglioside requires the correct synthesis, intracellular assembly and transport of three separate gene products; i.e., the alpha and beta subunits of heterodimeric beta-hexosaminidase A, E.C. # 3.2.1.52 (encoded by the HEXA and HEXB genes, respectively, and the GM2-activator protein (GM2AP, encoded by the GM2A gene. Mutations in any one of these genes can result in one of three neurodegenerative diseases collectively known as GM2 gangliosidosis (HEXA, Tay-Sachs disease, MIM # 272800; HEXB, Sandhoff disease, MIM # 268800; and GM2A, AB-variant form, MIM # 272750. Elements of both of the hexosaminidase A subunits are needed to productively interact with the GM2 ganglioside-GM2AP complex in the lysosome. Some of these elements have been predicted from the crystal structures of hexosaminidase and the activator. Recently a hybrid of the two subunits has been constructed and reported to be capable of forming homodimers that can perform this reaction in vivo, which could greatly simplify vector-mediated gene transfer approaches for Tay-Sachs or Sandhoff diseases. A cDNA encoding a hybrid hexosaminidase subunit capable of dimerizing and hydrolyzing GM2 ganglioside could be incorporated into a single vector, whereas packaging both subunits of hexosaminidase A into vectors, such as adeno-associated virus, would be impractical due to size constraints. In this report we examine the previously published hybrid construct (H1 and a new more extensive hybrid (H2, with our documented in cellulo (live cell- based assay utilizing a fluorescent GM2 ganglioside derivative. Unfortunately when Tay-Sachs cells were transfected with either the H1 or H2 hybrid construct and then were fed the GM2 derivative, no significant increase in its turnover was detected. In vitro assays with the isolated H1 or H2 homodimers confirmed that neither was capable of human GM2AP-dependent hydrolysis of GM2 ganglioside.

  13. Evolutionary Analysis of the B56 Gene Family of PP2A Regulatory Subunits

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    Lauren M. Sommer

    2015-05-01

    Full Text Available Protein phosphatase 2A (PP2A is an abundant serine/threonine phosphatase that functions as a tumor suppressor in numerous cell-cell signaling pathways, including Wnt, myc, and ras. The B56 subunit of PP2A regulates its activity, and is encoded by five genes in humans. B56 proteins share a central core domain, but have divergent amino- and carboxy-termini, which are thought to provide isoform specificity. We performed phylogenetic analyses to better understand the evolution of the B56 gene family. We found that B56 was present as a single gene in eukaryotes prior to the divergence of animals, fungi, protists, and plants, and that B56 gene duplication prior to the divergence of protostomes and deuterostomes led to the origin of two B56 subfamilies, B56αβε and B56γδ. Further duplications led to three B56αβε genes and two B56γδ in vertebrates. Several nonvertebrate B56 gene names are based on distinct vertebrate isoform names, and would best be renamed. B56 subfamily genes lack significant divergence within primitive chordates, but each became distinct in complex vertebrates. Two vertebrate lineages have undergone B56 gene loss, Xenopus and Aves. In Xenopus, B56δ function may be compensated for by an alternatively spliced transcript, B56δ/γ, encoding a B56δ-like amino-terminal region and a B56γ core.

  14. Effects of estradiol-17beta administration on steady-state messenger ribonucleic acid (MRNA) encoding equine alpha and LH/CGbeta subunits in pituitaries of ovariectomized pony mares.

    Science.gov (United States)

    Sharp, D C; Wolfe, M W; Cleaver, B D; Nilson, J

    2001-03-15

    The process of sexual recrudescence in the springtime in mares is characterized by renewal of follicular growth and acquisition of steroidogenic competence. Concomitant with renewal of follicular steroidogenesis is re-establishment of LH biosynthesis and secretion. Research results from our laboratory indicate that increased estradiol and LH secretion occur in close temporal association before the first ovulation of the year. Therefore, the hypothesis tested in this experiment was that estrogen administration to ovariectomized pony mares during the equivalent time of early vernal transition would enhance LH biosynthesis as monitored by messenger ribonucleic acid (mRNA) encoding for the pituitary subunits of LH (alpha and LH/CGbeta). Mares were administered either sesame oil vehicle control, or estradiol (5 mg i.m. twice daily in sesame oil) for 3, 6 or 9 days, beginning on February 2. The pituitary glands were harvested, and examined for LH subunit mRNA by Northern Blot and slot blot analysis. There was a significant increase in LH secretion after 6 days of estradiol secretion compared with control vehicle administration. Similarly, there was a significant increase in both alpha and LH/CGbeta subunit mRNA when estradiol was administered for 9 days. These data indicate that estrogen stimulates LH subunit formation in mares during early equivalent vernal transition. These data do not, however, discriminate between a direct pituitary effect of estrogen, and a hypothalamic effect. Whether the surge of estradiol just prior to the first ovulation of the year is essential for the renewed biosynthesis of LH subunits cannot be determined from these data. However an important role of estrogen in the final stages of sexual recrudescence is indicated.

  15. Early expression of GABA(A) receptor delta subunit in the neonatal rat hippocampus.

    Science.gov (United States)

    Didelon, F; Mladinic', M; Cherubini, E; Bradbury, A

    2000-12-01

    The cDNA library screening strategy was used to identify the genes encoding for GABA(A) receptor subunits in the rat hippocampus during development. With this technique, genes encoding eleven GABA(A) receptor subunits were identified. The alpha5 subunit was by far the most highly expressed, followed by the gamma2, alpha2 and alpha4 subunits respectively. The expression of the beta2, alpha1, gamma1, beta1 and beta3 subunits was moderate, although that of the alpha3 and delta subunits was weak. In situ hybridization experiments, using digoxigenin-labeled cRNA probes, confirmed that the delta subunit was expressed in the neonatal as well as in the adult hippocampus, and is likely to form functional receptors in association with other subunits of the GABA(A) receptor. When the more sensitive RT-PCR approach was used, the gamma3 subunit was also detected, suggesting that this subunit is present in the hippocampus during development but at low levels of expression. The insertion of the delta subunit into functional GABA(A) receptors may enhance the efficacy of GABA in the immediate postnatal period when this amino acid is still exerting a depolarizing and excitatory action.

  16. Apoptosis Gene Hunting Using Retroviral Expression Cloning: Identification of Vacuolar ATPase Subunit E

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    Claire L. Anderson

    2003-01-01

    Full Text Available Over the past 10-15 years there has been an explosion of interest in apoptosis. The delayed realisation that cell death is an essential part of life for any multicellular organism has meant that, despite the recent and rapid developments of the last decade, the precise biochemical pathways involved in apoptosis remain incomplete and potentially novel genes may, as yet, remain undiscovered. The hunt is therefore on to bridge the remaining gaps in our knowledge. Our contribution to this research effort utilises a functional cloning approach to isolate important regulatory genes involved in apoptosis. This mini-review focuses on the use and advantages of a retroviral expression cloning strategy and describes the isolation and identification of one such potential apoptosis regulatory gene, namely that encoding vacuolar ATPase subunit E.

  17. Construction of Recombinant Plasmid Containing S. Mutans F-ATPase β Subunit Gene

    Institute of Scientific and Technical Information of China (English)

    YU Dan-ni; JIANG Li

    2005-01-01

    objective: construct a homologous recombinant plasmid which was expected to be transformed into S. mutans Methods: a region at the 5' terminus of the S. mutans F-ATPase β subunit gene was amplified by PCR, the PCR product was inserted into vector pVA891, yielding recombinant plasmid. Results: the DNA sequence of the recombinant plasmid was identified correct in whole by restriction endonuclease and DNA sequence techniques. Conclusion: the recombinant plasmid of S. mutans DNA was cloned in effect ,it may assist in construction of homologues recombinant mutant.

  18. Exercise induced upregulation of glutamate-cysteine ligase catalytic subunit and glutamate-cysteine ligase modifier subunit gene expression in Thoroughbred horses

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    Jeong-Woong Park

    2017-05-01

    Full Text Available Objective This study was performed to reveal the molecular structure and expression patterns of horse glutamate-cysteine ligase catalytic subunit (GCLC and glutamate-cysteine ligase modifier subunit (GCLM genes whose products form glutamate cysteine ligase, which were identified as differentially expressed genes in the previous study. Methods We performed bioinformatics analyses, and gene expression assay with quantitative polymerase chain reaction (qPCR for horse GCLC and GCLM genes in muscle and blood leukocytes of Thoroughbred horses Results Expression of GCLC showed the same pattern in both blood and muscle tissues after exercise. Expression of GCLC increased in the muscle and blood of Thoroughbreds, suggesting a tissue-specific regulatory mechanism for the expression of GCLC. In addition, expression of the GCLM gene increased after exercise in both the blood and muscle of Thoroughbreds. Conclusion We established the expression patterns of GCLC and GCLM in the skeletal muscle and blood of Thoroughbred horses in response to exercise. Further study is now warranted to uncover the functional importance of these genes in exercise and recovery in racehorses.

  19. Evaluation of Zinc-alpha-2-Glycoprotein and Proteasome Subunit beta-Type 6 Expression in Prostate Cancer Using Tissue Microarray Technology.

    LENUS (Irish Health Repository)

    2010-07-23

    Prostate cancer (CaP) is a significant cause of illness and death in males. Current detection strategies do not reliably detect the disease at an early stage and cannot distinguish aggressive versus nonaggressive CaP leading to potential overtreatment of the disease and associated morbidity. Zinc-alpha-2-glycoprotein (ZAG) and proteasome subunit beta-Type 6 (PSMB-6) were found to be up-regulated in the serum of CaP patients with higher grade tumors after 2-dimensional difference gel electrophoresis analysis. The aim of this study was to investigate if ZAG and PSMB-6 were also overexpressed in prostatic tumor tissue of CaP patients. Immunohistochemical analysis was performed on CaP tissue microarrays with samples from 199 patients. Confirmatory gene expression profiling for ZAG and PSMB-6 were performed on 4 cases using Laser Capture Microdissection and TaqMan real-time polymerase chain reaction. ZAG expression in CaP epithelial cells was inversely associated with Gleason grade (benign prostatic hyperplasia>G3>G4\\/G5). PSMB-6 was not expressed in either tumor or benign epithelium. However, strong PSMB-6 expression was noted in stromal and inflammatory cells. Our results indicate ZAG as a possible predictive marker of Gleason grade. The inverse association between grade and tissue expression with a rising serum protein level is similar to that seen with prostate-specific antigen. In addition, the results for both ZAG and PSMB-6 highlight the challenges in trying to associate the protein levels in serum with tissue expression.

  20. Drosophila casein kinase I alpha regulates homolog pairing and genome organization by modulating condensin II subunit Cap-H2 levels.

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    Huy Q Nguyen

    Full Text Available The spatial organization of chromosomes within interphase nuclei is important for gene expression and epigenetic inheritance. Although the extent of physical interaction between chromosomes and their degree of compaction varies during development and between different cell-types, it is unclear how regulation of chromosome interactions and compaction relate to spatial organization of genomes. Drosophila is an excellent model system for studying chromosomal interactions including homolog pairing. Recent work has shown that condensin II governs both interphase chromosome compaction and homolog pairing and condensin II activity is controlled by the turnover of its regulatory subunit Cap-H2. Specifically, Cap-H2 is a target of the SCFSlimb E3 ubiquitin-ligase which down-regulates Cap-H2 in order to maintain homologous chromosome pairing, chromosome length and proper nuclear organization. Here, we identify Casein Kinase I alpha (CK1α as an additional negative-regulator of Cap-H2. CK1α-depletion stabilizes Cap-H2 protein and results in an accumulation of Cap-H2 on chromosomes. Similar to Slimb mutation, CK1α depletion in cultured cells, larval salivary gland, and nurse cells results in several condensin II-dependent phenotypes including dispersal of centromeres, interphase chromosome compaction, and chromosome unpairing. Moreover, CK1α loss-of-function mutations dominantly suppress condensin II mutant phenotypes in vivo. Thus, CK1α facilitates Cap-H2 destruction and modulates nuclear organization by attenuating chromatin localized Cap-H2 protein.

  1. Drosophila Casein Kinase I Alpha Regulates Homolog Pairing and Genome Organization by Modulating Condensin II Subunit Cap-H2 Levels

    Science.gov (United States)

    Nguyen, Huy Q.; Nye, Jonathan; Buster, Daniel W.; Klebba, Joseph E.; Rogers, Gregory C.; Bosco, Giovanni

    2015-01-01

    The spatial organization of chromosomes within interphase nuclei is important for gene expression and epigenetic inheritance. Although the extent of physical interaction between chromosomes and their degree of compaction varies during development and between different cell-types, it is unclear how regulation of chromosome interactions and compaction relate to spatial organization of genomes. Drosophila is an excellent model system for studying chromosomal interactions including homolog pairing. Recent work has shown that condensin II governs both interphase chromosome compaction and homolog pairing and condensin II activity is controlled by the turnover of its regulatory subunit Cap-H2. Specifically, Cap-H2 is a target of the SCFSlimb E3 ubiquitin-ligase which down-regulates Cap-H2 in order to maintain homologous chromosome pairing, chromosome length and proper nuclear organization. Here, we identify Casein Kinase I alpha (CK1α) as an additional negative-regulator of Cap-H2. CK1α-depletion stabilizes Cap-H2 protein and results in an accumulation of Cap-H2 on chromosomes. Similar to Slimb mutation, CK1α depletion in cultured cells, larval salivary gland, and nurse cells results in several condensin II-dependent phenotypes including dispersal of centromeres, interphase chromosome compaction, and chromosome unpairing. Moreover, CK1α loss-of-function mutations dominantly suppress condensin II mutant phenotypes in vivo. Thus, CK1α facilitates Cap-H2 destruction and modulates nuclear organization by attenuating chromatin localized Cap-H2 protein. PMID:25723539

  2. Transcriptional activation of the mouse obese (ob) gene by CCAAT/enhancer binding protein alpha

    DEFF Research Database (Denmark)

    Hwang, C S; Mandrup, S; MacDougald, O A

    1996-01-01

    Like other adipocyte genes that are transcriptionally activated by CCAAT/enhancer binding protein alpha (C/EBP alpha) during preadipocyte differentiation, expression of the mouse obese (ob) gene is immediately preceded by the expression of C/EBP alpha. While the 5' flanking region of the mouse ob...

  3. MID1 and MID2 homo- and heterodimerise to tether the rapamycin-sensitive PP2A regulatory subunit, Alpha 4, to microtubules: implications for the clinical variability of X-linked Opitz GBBB syndrome and other developmental disorders

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    Cox Timothy C

    2002-01-01

    Full Text Available Abstract Background Patients with Opitz GBBB syndrome present with a variable array of developmental defects including craniofacial, cardiac, and genital anomalies. Mutations in the X-linked MID1 gene, which encodes a microtubule-binding protein, have been found in ~50% of Opitz GBBB syndrome patients consistent with the genetically heterogeneous nature of the disorder. A protein highly related to MID1, called MID2, has also been described that similarly associates with microtubules. Results To identify protein partners of MID1 and MID2 we undertook two separate yeast two-hybrid screens. Using this system we identified Alpha 4, a regulatory subunit of PP2-type phosphatases and a key component of the rapamycin-sensitive signaling pathway, as a strong interactor of both proteins. Analysis of domain-specific deletions has shown that the B-boxes of both MID1 and MID2 mediate the interaction with Alpha 4, the first demonstration in an RBCC protein of a specific role for the B-box region. In addition, we show that the MID1/2 coiled-coil motifs mediate both homo- and hetero-dimerisation, and that dimerisation is a prerequisite for association of the MID-Alpha 4 complex with microtubules. Conclusions Our findings not only implicate Alpha 4 in the pathogenesis of Opitz GBBB syndrome but also support our earlier hypothesis that MID2 is a modifier of the X-linked phenotype. Of further note is the observation that Alpha 4 maps to Xq13 within the region showing linkage to FG (Opitz-Kaveggia syndrome. Overlap in the clinical features of FG and Opitz GBBB syndromes warrants investigation of Alpha 4 as a candidate for causing FG syndrome.

  4. Sequence analysis of dolphin ferritin H and L subunits and possible iron-dependent translational control of dolphin ferritin gene

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    Sasaki Yukako

    2008-10-01

    Full Text Available Abstract Background Iron-storage protein, ferritin plays a central role in iron metabolism. Ferritin has dual function to store iron and segregate iron for protection of iron-catalyzed reactive oxygen species. Tissue ferritin is composed of two kinds of subunits (H: heavy chain or heart-type subunit; L: light chain or liver-type subunit. Ferritin gene expression is controlled at translational level in iron-dependent manner or at transcriptional level in iron-independent manner. However, sequencing analysis of marine mammalian ferritin subunits has not yet been performed fully. The purpose of this study is to reveal cDNA-derived amino acid sequences of cetacean ferritin H and L subunits, and demonstrate the possibility of expression of these subunits, especially H subunit, by iron. Methods Sequence analyses of cetacean ferritin H and L subunits were performed by direct sequencing of polymerase chain reaction (PCR fragments from cDNAs generated via reverse transcription-PCR of leukocyte total RNA prepared from blood samples of six different dolphin species (Pseudorca crassidens, Lagenorhynchus obliquidens, Grampus griseus, Globicephala macrorhynchus, Tursiops truncatus, and Delphinapterus leucas. The putative iron-responsive element sequence in the 5'-untranslated region of the six different dolphin species was revealed by direct sequencing of PCR fragments obtained using leukocyte genomic DNA. Results Dolphin H and L subunits consist of 182 and 174 amino acids, respectively, and amino acid sequence identities of ferritin subunits among these dolphins are highly conserved (H: 99–100%, (99→98 ; L: 98–100%. The conserved 28 bp IRE sequence was located -144 bp upstream from the initiation codon in the six different dolphin species. Conclusion These results indicate that six different dolphin species have conserved ferritin sequences, and suggest that these genes are iron-dependently expressed.

  5. The dnaN gene codes for the beta subunit of DNA polymerase III holoenzyme of escherichia coli.

    Science.gov (United States)

    Burgers, P M; Kornberg, A; Sakakibara, Y

    1981-09-01

    An Escherichia coli mutant, dnaN59, stops DNA synthesis promptly upon a shift to a high temperature; the wild-type dnaN gene carried in a transducing phage encodes a polypeptide of about 41,000 daltons [Sakakibara, Y. & Mizukami, T. (1980) Mol. Gen. Genet. 178, 541-553; Yuasa, S. & Sakakibara, Y. (1980) Mol. Gen. Genet. 180, 267-273]. We now find that the product of dnaN gene is the beta subunit of DNA polymerase III holoenzyme, the principal DNA synthetic multipolypeptide complex in E. coli. The conclusion is based on the following observations: (i) Extracts from dnaN59 cells were defective in phage phi X174 and G4 DNA synthesis after the mutant cells had been exposed to the increased temperature. (ii) The enzymatic defect was overcome by addition of purified beta subunit but not by other subunits of DNA polymerase III holoenzyme or by other replication proteins required for phi X174 DNA synthesis. (iii) Partially purified beta subunit from the dnaN mutant, unlike that from the wild type, was inactive in reconstituting the holoenzyme when mixed with the other purified subunits. (iv) Increased dosage of the dnaN gene provided by a plasmid carrying the gene raised cellular levels of the beta subunit 5- to 6-fold.

  6. Association of the nicotinic receptor α7 subunit gene (CHRNA7 with schizophrenia and visual backward masking

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    George eBakanidze

    2013-10-01

    Full Text Available The nicotinic system is involved in the pathophysiology of schizophrenia. However, very little is known about its genetic basis and how it relates to clinical symptoms and potentially pharmacological intervention. Here, we investigated five single nucleotide polymorphisms (SNPs [rs3826029] [rs2337506] [rs982574] [rs904952] [rs2337980] of the cholinergic nicotinic receptor gene, alpha 7 subunit (CHRNA7 and their association to schizophrenia. We found an association with rs904952 (p=0.009 in a German sample of 224 schizophrenic patients and 224 healthy control subjects. The same trend was shown in an independent Georgian sample of 50 schizophrenic patients, 57 first order unaffected relatives, and 51 healthy controls. In addition, visual backward masking (VBM, a sensitive test for early visual information processing, was assessed in the Georgian sample. In line with prior studies, VBM performance deficits were much more pronounced in schizophrenic patients and their unaffected relatives compared to healthy controls (schizophrenic patients: 156 ms; unaffected relatives: 60 ms; healthy controls: 33 ms. VBM was strongly correlated with SNP rs904952 (H[2]=7.3, p=0.026. Our results further support the notion that changes in the nicotinic system are involved in schizophrenia and open the avenue for pharmacological intervention.

  7. Protein kinase CK2: evidence for a protein kinase CK2beta subunit fraction, devoid of the catalytic CK2alpha subunit, in mouse brain and testicles

    DEFF Research Database (Denmark)

    Guerra, B; Siemer, S; Boldyreff, B

    1999-01-01

    signals were observed for lung, liver and testicles. In the case of CK2beta mRNA the highest signals were found for testicles, kidney, brain and liver. The amount of CK2beta mRNA in testicles was estimated to be about 6-fold higher than in brain. The strongest CK2beta signals in the Western blot were...... in brain and testicles. By contrast, Northern blot analyses of the CK2alpha mRNA revealed a somewhat different picture. Here, the strongest signals were obtained for brain, liver, heart and lung. In kidney, spleen and testicles mRNAs were only weakly detectable. For CK2alpha' mRNA distribution strong...

  8. Potentiation of prolactin secretion following lactotrope escape from dopamine action. II. Phosphorylation of the alpha(1) subunit of L-type, voltage-dependent calcium channels.

    Science.gov (United States)

    Hernández, M E; del Mar Hernández, M; Díaz-Muñoz, M; Clapp, C; de la Escalera, G M

    1999-07-01

    Modulation of Ca(2+) channels has been shown to alter cellular functions. It can play an important role in the amplification of signals in the endocrine system, including the pleiotropically regulated pituitary lactotropes. Prolactin (PRL) secretion is tonically inhibited by dopamine (DA), the escape from which triggers acute episodes of hormone secretion. The magnitude of these episodes is explained by a potentiation of the PRL-releasing action of secretagogues such as thyrotropin-releasing hormone (TRH). While the mechanisms of this potentiation are not fully understood, it is known to be mimicked by the dihydropyridine, L-type Ca(2+) channel agonist Bay K 8644 and blocked by nifedipine and methoxyverapamil. The potentiation is also blocked by inhibitors of cyclic AMP-dependent protein kinase and protein kinase C. We recently described that the escape from tonic actions of DA results in increased macroscopic Ca(2+) currents in GH(4)C(1) lactotropic clonal cells transfected with a cDNA encoding the long form of the human D(2)-DA receptor. Here we show that the withdrawal from DA potentiates the PRL-releasing action of TRH in GH(4)C(1)/D(2)-DAR cells to the same extent as in enriched lactotropes in primary culture. In both experimental models a low density of dihydropyridine receptors was shown by (+)-[(3)H]PN200-110 binding. Photoaffinity labelling with the dihydropyridine [(3)H]azidopine revealed a protein consistent with the alpha(1) subunit of L-type Ca(2+) channels of 165-170 kDa. In both experimental models, the facilitation of TRH action triggered by the escape from DA was correlated with an enhanced rate of phosphorylation of this putative alpha(1) subunit, the nature of which was further supported by immunoprecipitation with selective antibodies directed against the alpha(1C) and alpha(1D) subunit of voltage-gated calcium channels. We propose that PKA- and PKC-dependent phosphorylation of the alpha(1) subunit of high voltage activated, L-type Ca(2

  9. Characterization of the gene for the a subunit of human factor XIII (plasma transglutaminase), a blood coagulation factor

    Energy Technology Data Exchange (ETDEWEB)

    Ichinose, A.; Davie, E.W. (Univ. of Washington, Seattle (USA))

    1988-08-01

    Factor XIII (plasma transglutaminase, fibrin stabilizing factor) is a glycoprotein that circulates in blood as a tetramer (a{sub 2}b{sub 2}) consisting of two a and two b subunits. The primary structures of the a and b subunits of human factor XIII have been reported by a combination of cDNA cloning and amino acid sequence analysis. To establish the gene structure of the a subunit for factor XIII, several human genomic libraries were screened by using the cDNA encoding the a subunit as a probe. Among {approx}5 {times} 10{sup 7} recombinant phage, 121 have been shown to contain an insert encoding a portion of the a subunit. Twenty-five unique clones were than characterized by restriction mapping, Southern blotting, and DNA sequencing. Overlapping clones encoding the a subunit of factor XIII span >160 kilobases. DNA sequence analysis revealed that the activation peptide released by thrombin, the active site cysteine region, the two putative calcium-binding regions, and the thrombin cleavage site leading to inactivation are encoded by separate exons. This suggest that the introns may separate the a subunit into functional and structural domains. A comparison of the amino acid sequence deduced from the genomic DNA sequence with those deduced from cDNA or determined by amino acid sequence analysis of the plasma and placental proteins revealed apparent amino acid polymorphisms in six positions of the polypeptide chain of the a subunit.

  10. Characterization of a Low-Molecular-Weight Glutenin Subunit Gene from Bread Wheat and the Corresponding Protein That Represents a Major Subunit of the Glutenin Polymer1

    Science.gov (United States)

    Masci, Stefania; D'Ovidio, Renato; Lafiandra, Domenico; Kasarda, Donald D.

    1998-01-01

    Both high- and low-molecular-weight glutenin subunits (LMW-GS) play the major role in determining the viscoelastic properties of wheat (Triticum aestivum L.) flour. To date there has been no clear correspondence between the amino acid sequences of LMW-GS derived from DNA sequencing and those of actual LMW-GS present in the endosperm. We have characterized a particular LMW-GS from hexaploid bread wheat, a major component of the glutenin polymer, which we call the 42K LMW-GS, and have isolated and sequenced the putative corresponding gene. Extensive amino acid sequences obtained directly for this 42K LMW-GS indicate correspondence between this protein and the putative corresponding gene. This subunit did not show a cysteine (Cys) at position 5, in contrast to what has frequently been reported for nucleotide-based sequences of LMW-GS. This Cys has been replaced by one occurring in the repeated-sequence domain, leaving the total number of Cys residues in the molecule the same as in various other LMW-GS. On the basis of the deduced amino acid sequence and literature-based assignment of disulfide linkages, a computer-generated molecular model of the 42K subunit was constructed. PMID:9847089

  11. The host-dependent interaction of alpha-importins with influenza PB2 polymerase subunit is required for virus RNA replication.

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    Patricia Resa-Infante

    Full Text Available The influenza virus polymerase is formed by the PB1, PB2 and PA subunits and is required for virus transcription and replication in the nucleus of infected cells. As PB2 is a relevant host-range determinant we expressed a TAP-tagged PB2 in human cells and isolated intracellular complexes. Alpha-importin was identified as a PB2-associated factor by proteomic analyses. To study the relevance of this interaction for virus replication we mutated the PB2 NLS and analysed the phenotype of mutant subunits, polymerase complexes and RNPs. While mutant PB2 proteins showed reduced nuclear accumulation, they formed polymerase complexes normally when co expressed with PB1 and PA. However, mutant RNPs generated with a viral CAT replicon showed up to hundred-fold reduced CAT accumulation. Rescue of nuclear localisation of mutant PB2 by insertion of an additional SV40 TAg-derived NLS did not revert the mutant phenotype of RNPs. Furthermore, determination of recombinant RNP accumulation in vivo indicated that PB2 NLS mutations drastically reduced virus RNA replication. These results indicate that, above and beyond its role in nuclear accumulation, PB2 interaction with alpha-importins is required for virus RNA replication. To ascertain whether PB2-alpha-importin binding could contribute to the adaptation of H5N1 avian viruses to man, their association in vivo was determined. Human alpha importin isoforms associated efficiently to PB2 protein of an H3N2 human virus but bound to diminished and variable extents to PB2 from H5N1 avian or human strains, suggesting that the function of alpha importin during RNA replication is important for the adaptation of avian viruses to the human host.

  12. Gene Regulation, Alternative Splicing, and Posttranslational Modification of Troponin Subunits in Cardiac Development and Adaptation: A Focused Review

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    Juan-Juan eSheng

    2014-04-01

    Full Text Available Troponin plays a central role in regulating the contraction and relaxation of vertebrate striated muscles. This review focuses on the isoform gene regulation, alternative RNA splicing, and posttranslational modifications of troponin subunits in cardiac development and adaptation. Transcriptional and posttranscriptional regulations such as phosphorylation and proteolysis modifications, and structure-function relationships of troponin subunit proteins are summarized. The physiological and pathophysiological significances are discussed for impacts on cardiac muscle contractility, heart function, and adaptations in health and diseases.

  13. Gene regulation, alternative splicing, and posttranslational modification of troponin subunits in cardiac development and adaptation: a focused review.

    Science.gov (United States)

    Sheng, Juan-Juan; Jin, Jian-Ping

    2014-01-01

    Troponin plays a central role in regulating the contraction and relaxation of vertebrate striated muscles. This review focuses on the isoform gene regulation, alternative RNA splicing, and posttranslational modifications of troponin subunits in cardiac development and adaptation. Transcriptional and posttranscriptional regulations such as phosphorylation and proteolysis modifications, and structure-function relationships of troponin subunit proteins are summarized. The physiological and pathophysiological significances are discussed for impacts on cardiac muscle contractility, heart function, and adaptations in health and diseases.

  14. Inhibin alpha-subunit (INHA expression in adrenocortical cancer is linked to genetic and epigenetic INHA promoter variation.

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    Johannes Hofland

    Full Text Available Adrenocortical carcinoma (ACC is a rare, but highly malignant tumor of unknown origin. Inhibin α-subunit (Inha knockout mice develop ACCs following gonadectomy. In man, INHA expression varies widely within ACC tissues and its circulating peptide inhibin pro-αC has been described as a novel tumor marker for ACC. We investigated whether genetic and epigenetic changes of the INHA gene in human ACC cause loss or variation of INHA expression. To this end, analyses of INHA sequence, promoter methylation and mRNA expression were performed in human adrenocortical tissues. Serum inhibin pro-αC levels were also measured in ACC patients. INHA genetic analysis in 37 unique ACCs revealed 10 novel, heterozygous rare variants. Of the 3 coding bases affected, one variant was synonymous and two were missense variants: S72F and S184F. The minor allele of rs11893842 at -124 bp was observed at a low frequency (24% in ACC samples and was associated with decreased INHA mRNA levels: 4.7±1.9 arbitrary units for AA, compared to 26±11 for AG/GG genotypes (P = 0.034. The methylation of four proximal INHA promoter CpGs was aberrantly increased in five ACCs (47.7±3.9%, compared to normal adrenals (18.4±0.6%, P = 0.0052, whereas the other 14 ACCs studied showed diminished promoter methylation (9.8±1.1%, P = 0.020. CpG methylation was inversely correlated to INHA mRNA levels in ACCs (r = -0.701, p = 0.0036, but not associated with serum inhibin pro-αC levels. In conclusion, aberrant methylation and common genetic variation in the INHA promoter occur in human ACCs and are associated with decreased INHA expression.

  15. Inhibin Alpha-Subunit (INHA) Expression in Adrenocortical Cancer Is Linked to Genetic and Epigenetic INHA Promoter Variation

    Science.gov (United States)

    Hofland, Johannes; Steenbergen, Jacobie; Voorsluijs, Jacoba M.; Verbiest, Michael M. P. J.; de Krijger, Ronald R.; Hofland, Leo J.; de Herder, Wouter W.; Uitterlinden, Andre G.; Feelders, Richard A.; de Jong, Frank H.

    2014-01-01

    Adrenocortical carcinoma (ACC) is a rare, but highly malignant tumor of unknown origin. Inhibin α-subunit (Inha) knockout mice develop ACCs following gonadectomy. In man, INHA expression varies widely within ACC tissues and its circulating peptide inhibin pro-αC has been described as a novel tumor marker for ACC. We investigated whether genetic and epigenetic changes of the INHA gene in human ACC cause loss or variation of INHA expression. To this end, analyses of INHA sequence, promoter methylation and mRNA expression were performed in human adrenocortical tissues. Serum inhibin pro-αC levels were also measured in ACC patients. INHA genetic analysis in 37 unique ACCs revealed 10 novel, heterozygous rare variants. Of the 3 coding bases affected, one variant was synonymous and two were missense variants: S72F and S184F. The minor allele of rs11893842 at −124 bp was observed at a low frequency (24%) in ACC samples and was associated with decreased INHA mRNA levels: 4.7±1.9 arbitrary units for AA, compared to 26±11 for AG/GG genotypes (P = 0.034). The methylation of four proximal INHA promoter CpGs was aberrantly increased in five ACCs (47.7±3.9%), compared to normal adrenals (18.4±0.6%, P = 0.0052), whereas the other 14 ACCs studied showed diminished promoter methylation (9.8±1.1%, P = 0.020). CpG methylation was inversely correlated to INHA mRNA levels in ACCs (r = −0.701, p = 0.0036), but not associated with serum inhibin pro-αC levels. In conclusion, aberrant methylation and common genetic variation in the INHA promoter occur in human ACCs and are associated with decreased INHA expression. PMID:25111790

  16. Co-expression of alpha7 and beta2 nicotinic acetylcholine receptor subunit mRNAs within rat brain cholinergic neurons.

    Science.gov (United States)

    Azam, L; Winzer-Serhan, U; Leslie, F M

    2003-01-01

    Nicotine enhances cognitive and attentional processes through stimulation of the basal forebrain cholinergic system. Although muscarinic cholinergic autoreceptors have been well characterized, pharmacological characterization of nicotinic autoreceptors has proven more difficult. The present study used double-labeling in situ hybridization to determine expression of nicotinic acetylcholine receptor (nAChR) subunit mRNAs within basal forebrain cholinergic neurons in order to gain information about possible nAChR autoreceptor properties. Cholinergic cells of the mesopontine tegmentum and striatal interneurons were also examined, as were septohippocampal GABAergic neurons that interact with cholinergic neurons to regulate hippocampal activity. alpha7 and beta2 nAChR mRNAs were found to be co-expressed in almost all cholinergic cells and in the majority of GABAergic neurons examined. alpha4 nAChR mRNA expression was restricted to cholinergic cells of the nucleus basalis magnocellularis, and to non-cholinergic cells of the medial septum and mesopontine tegmentum. These data suggest possible regional differences in the pharmacological properties of nicotinic autoreceptors on cholinergic cells. Whereas most cholinergic cells express rapidly desensitizing alpha7 homomers or alpha7beta2 heteromers, cortical projection neurons may also express a pharmacologically distinct alpha4beta2 nAChR subtype. There may also be differential nAChR regulation of cholinergic and non-cholinergic cells within the mesopontine tegmentum that are implicated in acquisition of nicotine self-administration.

  17. Agrobacterium-mediated transformation of the β-subunit gene in 7S globulin protein in soybean using RNAi technology.

    Science.gov (United States)

    Qu, J; Liu, S Y; Wang, P W; Guan, S Y; Fan, Y G; Yao, D; Zhang, L; Dai, J L

    2016-04-26

    The objective of this study was to use RNA interference (RNAi) to improve protein quality and decrease anti-nutritional effects in soybean. Agrobacterium tumefaciens-mediated transformation was conducted using RNAi and an expression vector containing the 7S globulin β-subunit gene. The BAR gene was used as the selective marker and cotyledonary nodes of soybean genotype Jinong 27 were chosen as explant material. Regenerated plants were detected by molecular biology techniques. Transformation of the β-subunit gene in the 7S protein was detected by PCR, Southern blot, and q-PCR. Positive plants (10 T0, and 6 T1, and 13 T2) were tested by PCR. Hybridization bands were detected by Southern blot analysis in two of the T1 transgenic plants. RNAi expression vectors containing the soybean 7S protein β-subunit gene were successfully integrated into the genome of transgenic plants. qRT-PCR analysis in soybean seeds showed a clear decrease in expression of the soybean β-subunit gene. The level of 7S protein β-subunit expression in transgenic plants decreased by 77.5% as compared to that of the wild-type plants. This study has established a basis for the application of RNAi to improve the anti-nutritional effects of soybean.

  18. Top-down proteomic identification of furin-cleaved alpha-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS

    Science.gov (United States)

    A method has been developed to identify the alpha-subunit of shiga toxin 2 (alpha-Stx2) from Escherichia coli O157:H7 using matrix-assisted laser desorption/ionization time-of-flight-time-of-flight tandem mass spectrometry (MALDI-TOF-TOF-MS/MS) and top-down proteomics using web-based software develo...

  19. Reduction of mouse egg surface integrin alpha9 subunit (ITGA9) reduces the egg's ability to support sperm-egg binding and fusion.

    Science.gov (United States)

    Vjugina, Ulyana; Zhu, Xiaoling; Oh, Eugene; Bracero, Nabal J; Evans, Janice P

    2009-04-01

    The involvement of egg integrins in mammalian sperm-egg interactions has been controversial, with data from integrin inhibitor studies contrasting with evidence from knockouts showing that specific integrin subunits are not essential for fertility. An alpha(4)/alpha(9) (ITGA4/ITGA9) integrin subfamily member has been implicated in fertilization but not extensively examined, so we tested the following three hypotheses: 1) an ITGA4/ITGA9 integrin participates in sperm-egg interactions, 2) short-term acute knockdown by RNA interference of integrin subunits would result in a fertilization phenotype differing from that of chronic depletion via knockout, and 3) detection of a fertilization phenotype is sensitive to in vitro fertilization (IVF) assay conditions. We show that mouse and human eggs express the alpha(9) integrin subunit (ITGA9). RNA interference-mediated knockdown resulted in reduced levels of Itga9 mRNA and surface protein in mouse eggs. RNA interference attempts to knockdown ITGA9's likely beta partner, beta(1) (ITGB1), resulted in reduced Itgb1 mRNA but no reduction in ITGB1 surface protein. Therefore, studies using a function-blocking anti-ITGB1 antibody tested the hypothesis that ITGB1 participates in gamete interactions. Analyses of sperm-egg interactions with Itga9-knockdown eggs and anti-ITGB1 antibody-treated eggs in IVF assays using specific sperm:egg ratios revealed the following: 1) a reduction, but not complete loss, of sperm-egg binding and fusion was observed and 2) the reduction of sperm-egg binding and fusion was not detected in inseminations with high sperm:egg ratios. These data demonstrate that ITGA9 and ITGB1 participate in sperm-egg interactions but clearly are not the only molecules involved. This also shows that careful design of IVF parameters allows detection of deficiencies in gamete interactions.

  20. Role of glycine residues highly conserved in the S2-S3 linkers of domains I and II of voltage-gated calcium channel alpha(1) subunits.

    Science.gov (United States)

    Teng, Jinfeng; Iida, Kazuko; Ito, Masanori; Izumi-Nakaseko, Hiroko; Kojima, Itaru; Adachi-Akahane, Satomi; Iida, Hidetoshi

    2010-05-01

    The pore-forming component of voltage-gated calcium channels, alpha(1) subunit, contains four structurally conserved domains (I-IV), each of which contains six transmembrane segments (S1-S6). We have shown previously that a Gly residue in the S2-S3 linker of domain III is completely conserved from yeasts to humans and important for channel activity. The Gly residues in the S2-S3 linkers of domains I and II, which correspond positionally to the Gly in the S2-S3 linker of domain III, are also highly conserved. Here, we investigated the role of the Gly residues in the S2-S3 linkers of domains I and II of Ca(v)1.2. Each of the Gly residues was replaced with Glu or Gln to produce mutant Ca(v)1.2s; G182E, G182Q, G579E, G579Q, and the resulting mutants were transfected into BHK6 cells. Whole-cell patch-clamp recordings showed that current-voltage relationships of the four mutants were the same as those of wild-type Ca(v)1.2. However, G182E and G182Q showed significantly smaller current densities because of mislocalization of the mutant proteins, suggesting that Gly(182) in domain I is involved in the membrane trafficking or surface expression of alpha(1) subunit. On the other hand, G579E showed a slower voltage-dependent current inactivation (VDI) compared to Ca(v)1.2, although G579Q showed a normal VDI, implying that Gly(579) in domain II is involved in the regulation of VDI and that the incorporation of a negative charge alters the VDI kinetics. Our findings indicate that the two conserved Gly residues are important for alpha(1) subunit to become functional.

  1. Developmental expression and gene/enzyme identifications in the alpha esterase gene cluster of Drosophila melanogaster.

    Science.gov (United States)

    Campbell, P M; de Q Robin, G C; Court, L N; Dorrian, S J; Russell, R J; Oakeshott, J G

    2003-10-01

    Here we show how the 10 genes of the alpha esterase cluster of Drosophila melanogaster have diverged substantially in their expression profiles. Together with previously described sequence divergence this suggests substantial functional diversification. By peptide mass fingerprinting and in vitro gene expression we have also shown that two of the genes encode the isozymes EST9 (formerly ESTC) and EST23. EST9 is the major 'alpha staining' esterase in zymograms of gut tissues in feeding stages while orthologues of EST23 confer resistance to organophosphorus insecticides in other higher Diptera. The results for EST9 and EST23 concur with previous suggestions that the products of the alpha esterase cluster function in digestion and detoxification of xenobiotic esters. However, many of the other genes in the cluster show developmental or tissue-specific expression that seems inconsistent with such roles. Furthermore, there is generally poor correspondence between the mRNA expression patterns of the remaining eight genes and isozymes previously characterized by standard techniques of electrophoresis and staining, suggesting that the alpha cluster might only account for a small minority of the esterase isozyme profile.

  2. Effects of cigarette smoke exposure on nicotinic acetylcholine receptor subunits {alpha}7 and {beta}2 in the sudden infant death syndrome (SIDS) brainstem

    Energy Technology Data Exchange (ETDEWEB)

    Machaalani, Rita, E-mail: rita.machaalani@sydney.edu.au [Department of Medicine, The University of Sydney, NSW 2006 (Australia); Bosch Institute, The University of Sydney, NSW 2006 (Australia); The Children' s Hospital at Westmead, NSW 2145 (Australia); Say, Meichien [Department of Medicine, The University of Sydney, NSW 2006 (Australia); Bosch Institute, The University of Sydney, NSW 2006 (Australia); Waters, Karen A. [Department of Medicine, The University of Sydney, NSW 2006 (Australia); Bosch Institute, The University of Sydney, NSW 2006 (Australia); The Children' s Hospital at Westmead, NSW 2145 (Australia)

    2011-12-15

    It is postulated that nicotine, as the main neurotoxic constituent of cigarette smoke, influences SIDS risk through effects on nicotinic acetylcholine receptors (nAChRs) in brainstem nuclei that control respiration and arousal. This study compared {alpha}7 and {beta}2 nAChR subunit expression in eight nuclei of the caudal and rostral medulla and seven nuclei of the pons between SIDS (n = 46) and non-SIDS infants (n = 14). Evaluation for associations with known SIDS risk factors included comparison according to whether infants had a history of exposure to cigarette smoke in the home, and stratification for sleep position and gender. Compared to non-SIDS infants, SIDS infants had significantly decreased {alpha}7 in the caudal nucleus of the solitary tract (cNTS), gracile and cuneate nuclei, with decreased {beta}2 in the cNTS and increased {beta}2 in the facial. When considering only the SIDS cohort: 1-cigarette smoke exposure was associated with increased {alpha}7 in the vestibular nucleus and increased {beta}2 in the rostral dorsal motor nucleus of the vagus, rNTS and Cuneate, 2-there was a gender interaction for {alpha}7 in the gracile and cuneate, and {beta}2 in the cNTS and rostral arcuate nucleus, and 3-there was no effect of sleep position on {alpha}7, but prone sleep was associated with decreased {beta}2 in three nuclei of the pons. In conclusion, SIDS infants demonstrate differences in expression of {alpha}7 and {beta}2 nAChRs within brainstem nuclei that control respiration and arousal, which is independent on prior history of cigarette smoke exposure, especially for the NTS, with additional differences for smoke exposure ({beta}2), gender ({alpha}7 and {beta}2) and sleep position ({beta}2) evident. -- Highlights: Black-Right-Pointing-Pointer The 'normal' response to smoke exposure is decreased {alpha}7 and {beta}2 in certain nuclei. Black-Right-Pointing-Pointer SIDS infants have decreased {alpha}7 in cNTS, Grac and Cun. Black

  3. Attenuation of the slow component of delayed rectification, action potential prolongation, and triggered activity in mice expressing a dominant-negative Kv2 alpha subunit.

    Science.gov (United States)

    Xu, H; Barry, D M; Li, H; Brunet, S; Guo, W; Nerbonne, J M

    1999-10-01

    An in vivo experimental strategy, involving cardiac-specific expression of a mutant Kv 2.1 subunit that functions as a dominant negative, was exploited in studies focused on exploring the role of members of the Kv2 subfamily of pore-forming (alpha) subunits in the generation of functional voltage-gated K(+) channels in the mammalian heart. A mutant Kv2.1 alpha subunit (Kv2.1N216) was designed to produce a truncated protein containing the intracellular N terminus, the S1 membrane-spanning domain, and a portion of the S1/S2 loop. The truncated Kv2.1N216 was epitope tagged at the C terminus with the 8-amino acid FLAG peptide to generate Kv2. 1N216FLAG. No ionic currents are detected on expression of Kv2. 1N216FLAG in HEK-293 cells, although coexpression of this construct with wild-type Kv2.1 markedly reduced the amplitudes of Kv2. 1-induced currents. Using the alpha-myosin heavy chain promoter to direct cardiac specific expression of the transgene, 2 lines of Kv2. 1N216FLAG-expressing transgenic mice were generated. Electrophysiological recordings from ventricular myocytes isolated from these animals revealed that I(K, slow) is selectively reduced. The attenuation of I(K, slow) is accompanied by marked action potential prolongation, and, occasionally, spontaneous triggered activity (apparently induced by early afterdepolarizations) is observed. The time constant of inactivation of I(K, slow) in Kv2. 1N216FLAG-expressing cells (mean+/-SEM=830+/-103 ms; n=17) is accelerated compared with the time constant of I(K, slow) inactivation (mean+/-SEM=1147+/-57 ms; n=25) in nontransgenic cells. In addition, unlike I(K, slow) in wild-type cells, the component of I(K, slow) remaining in the Kv2.1N216FLAG-expressing cells is insensitive to 25 mmol/L tetraethylammonium. Taken together, these observations suggest that there are 2 distinct components of I(K, slow) in mouse ventricular myocytes and that Kv2 alpha subunits underlie the more slowly inactivating, tetraethylammonium

  4. MiR-30e suppresses proliferation of hepatoma cells via targeting prolyl 4-hydroxylase subunit alpha-1 (P4HA1) mRNA

    Energy Technology Data Exchange (ETDEWEB)

    Feng, Guoxing [State Key Laboratory of Medicinal Chemical Biology, Department of Cancer Research, College of Life Sciences, Nankai University, Tianjin (China); Shi, Hui [State Key Laboratory of Medicinal Chemical Biology, Department of Biochemistry, College of Life Sciences, Nankai University, Tianjin (China); Li, Jiong; Yang, Zhe [State Key Laboratory of Medicinal Chemical Biology, Department of Cancer Research, College of Life Sciences, Nankai University, Tianjin (China); Fang, Runping; Ye, Lihong [State Key Laboratory of Medicinal Chemical Biology, Department of Biochemistry, College of Life Sciences, Nankai University, Tianjin (China); Zhang, Weiying, E-mail: zhwybao@nankai.edu.cn [State Key Laboratory of Medicinal Chemical Biology, Department of Cancer Research, College of Life Sciences, Nankai University, Tianjin (China); Zhang, Xiaodong, E-mail: zhangxd@nankai.edu.cn [State Key Laboratory of Medicinal Chemical Biology, Department of Cancer Research, College of Life Sciences, Nankai University, Tianjin (China)

    2016-04-08

    Aberrant microRNA expression has been shown to be characteristic of many cancers. It has been reported that the expression levels of miR-30e are decreased in liver cancer tissues. However, the role of miR-30e in hepatocellular carcinoma remains poorly understood. In the present study, we investigated the significance of miR-30e in hepatocarcinogenesis. Bioinformatics analysis reveals a putative target site of miR-30e in the 3′-untranslated region (3′UTR) of prolyl 4-hydroxylase subunit alpha-1 (P4HA1) mRNA. Moreover, luciferase reporter gene assays verified that miR-30e directly targeted 3′UTR of P4HA1 mRNA. Then, we demonstrated that miR-30e was able to reduce the expression of P4HA1 at the levels of mRNA and protein using reverse transcription-polymerase chain reaction and Western blot analysis. Enforced expression of miR-30e suppressed proliferation of HepG2 cells by 5-ethynyl-2-deoxyuridine (EdU) assay and reduced colony formation of these cells by colony formation analysis. Conversely, anti-miR-30e enhanced the proliferation of hepatoma cells in vitro. Interestingly, the ectopic expression of P4HA1 could efficiently rescue the inhibition of cell proliferation mediated by miR-30e in HepG2 cells. Meanwhile, silencing of P4HA1 abolished the anti-miR-30e-induced proliferation of cells. Clinically, quantitative real-time PCR showed that miR-30e was down-regulated in liver tumor tissues relative to their peritumor tissues. The expression levels of miR-30e were negatively correlated to those of P4HA1 mRNA in clinical liver tumor tissues. Thus, we conclude that miR-30e suppresses proliferation of hepatoma cells through targeting P4HA1 mRNA. Our finding provides new insights into the mechanism of hepatocarcinogenesis. - Highlights: • P4HA1 is a novel target gene of miR-30e. • P4HA1 is increased in clinical HCC tissues. • MiR-30e is negatively correlated with P4HA1 in clinical HCC tissues. • MiR-30e suppresses the proliferation of HCC cells through

  5. Identification of potential target genes of ROR-alpha in THP1 and HUVEC cell lines.

    Science.gov (United States)

    Gulec, Cagri; Coban, Neslihan; Ozsait-Selcuk, Bilge; Sirma-Ekmekci, Sema; Yildirim, Ozlem; Erginel-Unaltuna, Nihan

    2017-04-01

    ROR-alpha is a nuclear receptor, activity of which can be modulated by natural or synthetic ligands. Due to its possible involvement in, and potential therapeutic target for atherosclerosis, we aimed to identify ROR-alpha target genes in monocytic and endothelial cell lines. We performed chromatin immunoprecipitation (ChIP) followed by tiling array (ChIP-on-chip) for ROR-alpha in monocytic cell line THP1 and endothelial cell line HUVEC. Following bioinformatic analysis of the array data, we tested four candidate genes in terms of dependence of their expression level on ligand-mediated ROR-alpha activity, and two of them in terms of promoter occupancy by ROR-alpha. Bioinformatic analyses of ChIP-on-chip data suggested that ROR-alpha binds to genomic regions near the transcription start site (TSS) of more than 3000 genes in THP1 and HUVEC. Potential ROR-alpha target genes in both cell types seem to be involved mainly in membrane receptor activity, signal transduction and ion transport. While SPP1 and IKBKA were shown to be direct target genes of ROR-alpha in THP1 monocytes, inflammation related gene HMOX1 and heat shock protein gene HSPA8 were shown to be potential target genes of ROR-alpha. Our results suggest that ROR-alpha may regulate signaling receptor activity, and transmembrane transport activity through its potential target genes. ROR-alpha seems also to play role in cellular sensitivity to environmental substances like arsenite and chloroprene. Although, the expression analyses have shown that synthetic ROR-alpha ligands can modulate some of potential ROR-alpha target genes, functional significance of ligand-dependent modulation of gene expression needs to be confirmed with further analyses. Copyright © 2017 Elsevier Inc. All rights reserved.

  6. Cloning and purification of protein kinase CK2 recombinant alpha and beta subunits from the Mediterranean fly Ceratitis capitata.

    Science.gov (United States)

    Kouyanou-Koutsoukou, Sophia; Baier, Andrea; Kolaitis, Regina-Maria; Maniatopoulou, Evanthia; Thanopoulou, Konstantina; Szyszka, Ryszard

    2011-10-01

    The Mediterranean fruit fly Ceratitis capitata is an insect capable of wreaking extensive damage to a wide range of fruit crops. Protein kinase CK2 is a ubiquitous Ser/Thr kinase that is highly conserved among eukaryotes; it is a heterotetramer composed of two catalytic (α) and a dimer of regulatory (β) subunits. We present here the construction of the cDNA molecules of the CK2α and CK2β subunits from the medfly C. capitata by the 5'/3' RACE and RT-PCR methods, respectively. CcCK2α catalytic subunit presents the characteristic and conserved features of a typical protein kinase, similar to the regulatory CcCK2β subunit, that also possess the conserved features of regulatory CK2β subunits, as revealed by comparison of their predicted amino acid sequences with other eukaryotic species. The recombinant CcCK2α and CcCK2β proteins were purified by affinity chromatography to homogeneity, after overexpression in Escherichia coli. CcCK2α is capable to utilize GTP and its activity and is inhibited by polyanions and stimulated by polycations in phosphorylation assays, using purified acidic ribosomal protein P1 as a substrate.

  7. Mutations in the Gene Encoding the Ancillary Pilin Subunit of the Streptococcus suis srtF Cluster Result in Pili Formed by the Major Subunit Only

    Science.gov (United States)

    Fittipaldi, Nahuel; Takamatsu, Daisuke; la Cruz Domínguez-Punaro, María de; Lecours, Marie-Pier; Montpetit, Diane; Osaki, Makoto; Sekizaki, Tsutomu; Gottschalk, Marcelo

    2010-01-01

    Pili have been shown to contribute to the virulence of different Gram-positive pathogenic species. Among other critical steps of bacterial pathogenesis, these structures participate in adherence to host cells, colonization and systemic virulence. Recently, the presence of at least four discrete gene clusters encoding putative pili has been revealed in the major swine pathogen and emerging zoonotic agent Streptococcus suis. However, pili production by this species has not yet been demonstrated. In this study, we investigated the functionality of one of these pili clusters, known as the srtF pilus cluster, by the construction of mutant strains for each of the four genes of the cluster as well as by the generation of antibodies against the putative pilin subunits. Results revealed that the S. suis serotype 2 strain P1/7, as well as several other highly virulent invasive S. suis serotype 2 isolates express pili from this cluster. However, in most cases tested, and as a result of nonsense mutations at the 5′ end of the gene encoding the minor pilin subunit (a putative adhesin), pili were formed by the major pilin subunit only. We then evaluated the role these pili play in S. suis virulence. Abolishment of the expression of srtF cluster-encoded pili did not result in impaired interactions of S. suis with porcine brain microvascular endothelial cells. Furthermore, non-piliated mutants were as virulent as the wild type strain when evaluated in a murine model of S. suis sepsis. Our results show that srtF cluster-encoded, S. suis pili are atypical compared to other Gram-positive pili. In addition, since the highly virulent strains under investigation are unlikely to produce other pili, our results suggest that pili might be dispensable for critical steps of the S. suis pathogenesis of infection. PMID:20052283

  8. NUCLEOTIDE-SEQUENCE OF THE LAST EXON OF THE GENE FOR HUMAN CYTOCHROME-C-OXIDASE SUBUNIT-VIB AND ITS FLANKING REGIONS

    NARCIS (Netherlands)

    TAANMAN, JW; SCHRAGE, C; BOKMA, E; REUVEKAMP, P; AGSTERIBBE, E; DEVRIES, H

    1991-01-01

    A human genomic clone encompassing the last exon of the gene for cytochrome c oxidase subunit VIb and a human genomic clone containing the most distal end of this gene were characterized. The last exon of the gene codes for the 17 C-terminal amino acid residues of the subunit and the 3' noncoding re

  9. Analysis of the cytochrome c oxidase subunit II (COX2) gene in giant panda, Ailuropoda melanoleuca.

    Science.gov (United States)

    Ling, S S; Zhu, Y; Lan, D; Li, D S; Pang, H Z; Wang, Y; Li, D Y; Wei, R P; Zhang, H M; Wang, C D; Hu, Y D

    2017-01-23

    The giant panda, Ailuropoda melanoleuca (Ursidae), has a unique bamboo-based diet; however, this low-energy intake has been sufficient to maintain the metabolic processes of this species since the fourth ice age. As mitochondria are the main sites for energy metabolism in animals, the protein-coding genes involved in mitochondrial respiratory chains, particularly cytochrome c oxidase subunit II (COX2), which is the rate-limiting enzyme in electron transfer, could play an important role in giant panda metabolism. Therefore, the present study aimed to isolate, sequence, and analyze the COX2 DNA from individuals kept at the Giant Panda Protection and Research Center, China, and compare these sequences with those of the other Ursidae family members. Multiple sequence alignment showed that the COX2 gene had three point mutations that defined three haplotypes, with 60% of the sequences corresponding to haplotype I. The neutrality tests revealed that the COX2 gene was conserved throughout evolution, and the maximum likelihood phylogenetic analysis, using homologous sequences from other Ursidae species, showed clustering of the COX2 sequences of giant pandas, suggesting that this gene evolved differently in them.

  10. The carB gene encoding the large subunit of carbamoylphosphate synthetase from Lactococcus lactis is transcribed monocistronically

    DEFF Research Database (Denmark)

    Martinussen, Jan; Hammer, Karin

    1998-01-01

    The biosynthesis of carbamoylphosphate is catalysed by the heterodimeric enzyme carbamoylphosphate synthetase (CPSase). The genes encoding the two subunits in procaryotes are normally transcribed as an operon, whereas in Lactococcus lactis, the gene encoding the large subunit (carB) is shown...... to be an isolated transcriptional unit. Carbamoylphosphate is a precursor in the biosynthesis of both pyrimidine nucleotides and arginine. By mutant analysis L. lactis is shown to possess only one carB gene; the same gene product is thus required for both biosynthetic pathways. Furthermore, arginine may satisfy...... the requirement for carbamoylphosphate in pyrimidine biosynthesis through degradation by the arginine deiminase pathway. The expression of the carB gene is subject to regulation at the level of transcription by pyrimidines most probably by an attenuator mechanism. Upstream of the carB gene, an open reading frame...

  11. The β-conglycinin deficiency in wild soybean is associated with the tail-to-tail inverted repeat of the α-subunit genes.

    Science.gov (United States)

    Tsubokura, Yasutaka; Hajika, Makita; Kanamori, Hiroyuki; Xia, Zhengjun; Watanabe, Satoshi; Kaga, Akito; Katayose, Yuichi; Ishimoto, Masao; Harada, Kyuya

    2012-02-01

    β-conglycinin, a major seed protein in soybean, is composed of α, α', and β subunits sharing a high homology among them. Despite its many health benefits, β-conglycinin has a lower amino acid score and lower functional gelling properties compared to glycinin, another major soybean seed protein. In addition, the α, α', and β subunits also contain major allergens. A wild soybean (Glycine soja Sieb et Zucc.) line, 'QT2', lacks all of the β-conglycinin subunits, and the deficiency is controlled by a single dominant gene, Scg-1 (Suppressor of β-conglycinin). This gene was characterized using a soybean cultivar 'Fukuyutaka', 'QY7-25', (its near-isogenic line carrying the Scg-1 gene), and the F₂ population derived from them. The physical map of the Scg-1 region covered by lambda phage genomic clones revealed that the two α-subunit genes, a β-subunit gene, and a pseudo α-subunit gene were closely organized. The two α-subunit genes were arranged in a tail-to-tail orientation, and the genes were separated by 197 bp in Scg-1 compared to 3.3 kb in the normal allele (scg-1). In addition, small RNA was detected in immature seeds of the mutants by northern blot analysis using an RNA probe of the α subunit. These results strongly suggest that β-conglycinin deficiency in QT2 is controlled by post-transcriptional gene silencing through the inverted repeat of the α subunits.

  12. Mutations in the paralogous human alpha-globin genes yielding identical hemoglobin variants.

    Science.gov (United States)

    Moradkhani, Kamran; Préhu, Claude; Old, John; Henderson, Shirley; Balamitsa, Vera; Luo, Hong-Yuan; Poon, Man-Chiu; Chui, David H K; Wajcman, Henri; Patrinos, George P

    2009-06-01

    The human alpha-globin genes are paralogues, sharing a high degree of DNA sequence similarity and producing an identical alpha-globin chain. Over half of the alpha-globin structural variants reported to date are only characterized at the amino acid level. It is likely that a fraction of these variants, with phenotypes differing from one observation to another, may be due to the same mutation but on a different alpha-globin gene. There have been very few previous examples of hemoglobin variants that can be found at both HBA1 and HBA2 genes. Here, we report the results of a systematic multicenter study in a large multiethnic population to identify such variants and to analyze their differences from a functional and evolutionary perspective. We identified 14 different Hb variants resulting from identical mutations on either one of the two human alpha-globin paralogue genes. We also showed that the average percentage of hemoglobin variants due to a HBA2 gene mutation (alpha2) is higher than the percentage of hemoglobin variants due to the same HBA1 gene mutation (alpha1) and that the alpha2/alpha1 ratio varied between variants. These alpha-globin chain variants have most likely occurred via recurrent mutations, gene conversion events, or both. Based on these data, we propose a nomenclature for hemoglobin variants that fall into this category.

  13. Role of the Rubisco Small Subunit

    Energy Technology Data Exchange (ETDEWEB)

    Spreitzer, Robert Joseph [Univ. of Nebraska, Lincoln, NE (United States)

    2016-11-05

    Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) catalyzes the rate-limiting step of CO2 fixation in photosynthesis. However, it is a slow enzyme, and O2 competes with CO2 at the active site. Oxygenation initiates the photorespiratory pathway, which also results in the loss of CO2. If carboxylation could be increased or oxygenation decreased, an increase in net CO2 fixation would be realized. Because Rubisco provides the primary means by which carbon enters all life on earth, there is much interest in engineering Rubisco to increase the production of food and renewable energy. Rubisco is located in the chloroplasts of plants, and it is comprised of two subunits. Much is known about the chloroplast-gene-encoded large subunit (rbcL gene), which contains the active site, but much less is known about the role of the nuclear-gene-encoded small subunit in Rubisco function (rbcS gene). Both subunits are coded by multiple genes in plants, which makes genetic engineering difficult. In the eukaryotic, green alga Chlamydomonas reinhardtii, it has been possible to eliminate all the Rubisco genes. These Rubisco-less mutants can be maintained by providing acetate as an alternative carbon source. In this project, focus has been placed on determining whether the small subunit might be a better genetic-engineering target for improving Rubisco. Analysis of a variable-loop structure (βA-βB loop) of the small subunit by genetic selection, directed mutagenesis, and construction of chimeras has shown that the small subunit can influence CO2/O2 specificity. X-ray crystal structures of engineered chimeric-loop enzymes have indicated that additional residues and regions of the small subunit may also contribute to Rubisco function. Structural dynamics of the small-subunit carboxyl terminus was also investigated. Alanine-scanning mutagenesis of the most-conserved small-subunit residues has identified a

  14. A novel mutation in the sodium channel α1 subunit gene in a child with Dravet syndrome in Turkey

    Institute of Scientific and Technical Information of China (English)

    Mutluay Arslan; Ulu(c) Yi(s); Hande (C)a(g)layan; R1dvan Akin

    2013-01-01

    Dravet syndrome is a rare epileptic encephalopathy characterized by frequent seizures beginning in the first year of life and behavioral disorders. Mutations in the sodium channel α1 subunit gene are the main cause of this disease. We report two patients with refractory seizures and psychomotor retardation in whom the final diagnosis was Dravet syndrome with confirmed mutations in the sodium channel α1 subunit gene. The mutation identified in the second patient was a novel frame shift mutation, which resulted from the deletion of five nucleotides in exon 24.

  15. Peroxisome Proliferator-Activated Receptor Alpha Target Genes

    OpenAIRE

    Maryam Rakhshandehroo; Bianca Knoch; Michael Müller; Sander Kersten

    2010-01-01

    The peroxisome proliferator-activated receptor alpha (PPAR alpha) is a ligand-activated transcription factor involved in the regulation of a variety of processes, ranging from inflammation and immunity to nutrient metabolism and energy homeostasis. PPAR alpha serves as a molecular target for hypolipidemic fibrates drugs which bind the receptor with high affinity. Furthermore, PPAR alpha binds and is activated by numerous fatty acids and fatty acid-derived compounds. PPAR alpha governs biologi...

  16. Small-subunit ribosomal RNA gene sequences of Phaeodarea challenge the monophyly of Haeckel's Radiolaria.

    Science.gov (United States)

    Polet, Stephane; Berney, Cédric; Fahrni, José; Pawlowski, Jan

    2004-03-01

    In his grand monograph of Radiolaria, Ernst Haeckel originally included Phaeodarea together with Acantharea and Polycystinea, all three taxa characterized by the presence of a central capsule and the possession of axopodia. Cytological and ultrastructural studies, however, questioned the monophyly of Radiolaria, suggesting an independent evolutionary origin of the three taxa, and the first molecular data on Acantharea and Polycystinea brought controversial results. To test further the monophyly of Radiolaria, we sequenced the complete small subunit ribosomal RNA gene of three phaeodarians and three polycystines. Our analyses reveal that phaeodarians clearly branch among the recently described phylum Cercozoa, separately from Acantharea and Polycystinea. This result enhances the morphological variability within the phylum Cercozoa, which already contains very heterogeneous groups of protists. Our study also confirms the common origin of Acantharea and Polycystinea, which form a sister-group to the Cercozoa, and allows a phylogenetic reinterpretation of the morphological features of the three radiolarian groups.

  17. Promoter Structure of the RNA Polymerase II Large Subunit Gene in Caenorhabditis elegans and C. briggsae.

    Science.gov (United States)

    Bird, D M; Kaloshian, I; Molinari, S

    1997-06-01

    The 5'-end of the Caenorhabditis elegans ama-1 gene transcript, which encodes the largest subunit of RNA polymerase II, was cloned. Sequencing revealed that the message is trans-spliced. To characterize the Ce-ama-1 promoter, DNA sequence spanning 3 kb upstream from the initiation codon was determined. Typical elements, such as TATA and Spl sites, were absent. The homologue of ama-1 in C. briggsae, Cb-ama-1, was isolated and its 5' flanking sequence compared with that of Ce-ama-1, revealing only limited similarity, although both sequences included a potential initiator-class transcriptional regulator and phased repeats of an ATC motif. The latter elements are postulated to facilitate DNA bending and may play a role in transcription regulation.

  18. The chicken CCAAT/Enhancer Binding Protein alpha gene. Cloning, characterisation and tissue distribution

    NARCIS (Netherlands)

    Calkhoven, CF; Gringhuis, SI; Ab, G

    1997-01-01

    We present the cloning and sequencing of the gene encoding the chicken CCAAT/Enhancer Binding Protein alpha (cC/EBP alpha). The coding region and 1.5 kb of 5' flanking DNA form a CpG island. Comparison of the chicken C/EBP alpha sequence to the homologous proteins of other species reveals several ev

  19. Antagonism of ligand-gated ion channel receptors: two domains of the glycine receptor alpha subunit form the strychnine-binding site.

    Science.gov (United States)

    Vandenberg, R J; French, C R; Barry, P H; Shine, J; Schofield, P R

    1992-01-01

    The inhibitory glycine receptor (GlyR) is a member of the ligand-gated ion channel receptor superfamily. Glycine activation of the receptor is antagonized by the convulsant alkaloid strychnine. Using in vitro mutagenesis and functional analysis of the cDNA encoding the alpha 1 subunit of the human GlyR, we have identified several amino acid residues that form the strychnine-binding site. These residues were identified by transient expression of mutated cDNAs in mammalian (293) cells and examination of resultant [3H]strychnine binding, glycine displacement of [3H]strychnine, and electrophysiological responses to the application of glycine and strychnine. This mutational analysis revealed that residues from two separate domains within the alpha 1 subunit form the binding site for the antagonist strychnine. The first domain includes the amino acid residues Gly-160 and Tyr-161, and the second domain includes the residues Lys-200 and Tyr-202. These results, combined with analyses of other ligand-gated ion channel receptors, suggest a conserved tertiary structure and a common mechanism for antagonism in this receptor superfamily. PMID:1311851

  20. Complementation of Escherichia coli unc mutant strains by chloroplast and cyanobacterial F1-ATPase subunits.

    Science.gov (United States)

    Lill, H; Burkovski, A; Altendorf, K; Junge, W; Engelbrecht, S

    1993-10-04

    The genes encoding the five subunits of the F1 portion of the ATPases from both spinach chloroplasts and the cyanobacterium Synechocystis sp. PCC 6803 were cloned into expression vectors and expressed in Escherichia coli. The recombinant subunits formed inclusion bodies within the cells. Each particular subunit was expressed in the respective unc mutant, each unable to grow on non-fermentable carbon sources. The following subunits restored growth under conditions of oxidative phosphorylation: alpha (both sources, cyanobacterial subunit more than spinach subunit), beta (cyanobacterial subunit only), delta (both spinach and Synechocystis), and epsilon (both sources), whereas no growth was achieved with the gamma subunits from both sources. Despite a high degree of sequence homology the large subunits alpha and beta of spinach and cyanobacterial F1 were not as effective in the substitution of their E. coli counterparts. On the other hand, the two smallest subunits of the E. coli ATPase could be more effectively replaced by their cyanobacterial or chloroplast counterparts, although the sequence identity or even similarity is very low. We attribute these findings to the different roles of these subunits in F1: The large alpha and beta subunits contribute to the catalytic centers of the enzyme, a function rendering them very sensitive to even minor changes. For the smaller delta and epsilon subunits it was sufficient to maintain a certain tertiary structure during evolution, with little emphasis on the conservation of particular amino acids.

  1. Downstream targets of the Phytophthora infestans G alpha subunit PiGPA1 revealed by cDNA-AFLP

    NARCIS (Netherlands)

    Dong, W.; Latijnhouwers, M.; Jiang, R.H.Y.; Meijer, H.J.G.; Govers, F.

    2004-01-01

    In many plant pathogens heterotrimeric G-proteins are essential signalling components involved in development and pathogenicity. In the late blight oomycete pathogen Phytophthora infestans the G-protein (x subunit PiGPA1 controls zoospore motility and is required for virulence. To identify G-protein

  2. A genetic suppressor of two dominant temperature-sensitive lethal proteasome mutants of Drosophila melanogaster is itself a mutated proteasome subunit gene.

    Science.gov (United States)

    Neuburger, Peter J; Saville, Kenneth J; Zeng, Jue; Smyth, Kerrie-Ann; Belote, John M

    2006-07-01

    Two dominant temperature-sensitive (DTS) lethal mutants of Drosophila melanogaster are Pros26(1) and Prosbeta2(1), previously known as DTS5 and DTS7. Heterozygotes for either mutant die as pupae when raised at 29 degrees , but are normally viable and fertile at 25 degrees . Previous studies have identified these as missense mutations in the genes encoding the beta6 and beta2 subunits of the 20S proteasome, respectively. In an effort to isolate additional proteasome-related mutants a screen for dominant suppressors of Pros26(1) was carried out, resulting in the identification of Pros25(SuDTS) [originally called Su(DTS)], a missense mutation in the gene encoding the 20S proteasome alpha2 subunit. Pros25(SuDTS) acts in a dominant manner to rescue both Pros26(1) and Prosbeta2(1) from their DTS lethal phenotypes. Using an in vivo protein degradation assay it was shown that this suppression occurs by counteracting the dominant-negative effect of the DTS mutant on proteasome activity. Pros25(SuDTS) is a recessive polyphasic lethal at ambient temperatures. The effects of these mutants on larval neuroblast mitosis were also examined. While Prosbeta2(1) shows a modest increase in the number of defective mitotic figures, there were no defects seen with the other two mutants, other than slightly reduced mitotic indexes.

  3. Mapping of HNF4alpha target genes in intestinal epithelial cells

    DEFF Research Database (Denmark)

    Boyd, Mette; Bressendorff, Simon; Moller, Jette

    2009-01-01

    in the human intestinal epithelial cells in order to elucidate the role of HNF4alpha in the intestinal differentiation progress. METHODS: We have performed a ChIP-chip analysis of the human intestinal cell line Caco-2 in order to make a genome-wide identification of HNF4alpha binding to promoter regions......ABSTRACT: BACKGROUND: The role of HNF4alpha has been extensively studied in hepatocytes and pancreatic beta-cells, and HNF4alpha is also regarded as key regulator of intestinal epithelial cell differentiation as well. The aim of the present work is to identify novel HNF4alpha target genes......), and the tight junction protein cingulin (CGN) promoters verified that these genes are bound by HNF4alpha in Caco2 cells and for the Cdx-2 and trehalase promoters the HNF4alpha binding was verified in mouse small intestine epithelium. CONCLUSION: The HNF4alpha regulation of the Cdx-2 promoter unravels...

  4. Utility of the cytochrome c oxidase subunit I gene for the diagnosis of toxoplasmosis using PCR.

    Science.gov (United States)

    Feng, Xue; Norose, Kazumi; Li, Kexin; Hikosaka, Kenji

    2017-10-01

    Toxoplasmosis is caused by the protozoan parasite Toxoplasma gondii, which belongs to the phylum Apicomplexa. Since this parasite causes severe clinical symptoms in immunocompromised patients, early diagnosis of toxoplasmosis is essential. PCR is currently used for early diagnosis, but there is no consensus regarding the most effective method for amplifying Toxoplasma DNA. In this study, we considered the utility of the cytochrome c subunit I (cox1) gene, which is encoded in the mitochondrial DNA of this parasite, as a novel target of PCR for the diagnosis of toxoplasmosis. To do this, we compared its copy number per haploid nuclear genome and the detection sensitivity of cox1-PCR with the previously reported target genes B1 and 18S rRNA and the AF146527 repeat element. We found that the copy number of cox1 was high and that the PCR using cox1 primers was more efficient at amplifying Toxoplasma DNA than the other PCR targets examined. In addition, PCR using clinical samples indicated that the cox1 gene would be useful for the diagnosis of toxoplasmosis. These findings suggest that use of cox1-PCR would facilitate the diagnosis of toxoplasmosis in clinical laboratories. Copyright © 2017 Elsevier B.V. All rights reserved.

  5. Molecular cloning and expression analysis of a novel BCCP subunit gene from Aleurites moluccana.

    Science.gov (United States)

    Xuan, W Y; Zhang, Y; Liu, Z Q; Feng, D; Luo, M Y

    2015-08-19

    Aleurites moluccana L. is grown as a roadside tree in southern China and the oil content of its seed is higher than other oil plants, such as Jatropha curcas and Camellia oleifera. A. moluccana is considered a promising energy plant because its seed oil could be used to produce biodiesel and bio-jet fuel. In addition, the bark, leaves, and kernels of A. moluccana have various medical and commercial uses. Here, a novel gene coding the biotin carboxyl carrier protein subunit (BCCP) was cloned from A. moluccana L. using the homology cloning method combined with rapid amplification of cDNA end (RACE) technology. The isolated full-length cDNA sequence (designated AM-accB) was 1188 bp, containing a 795-bp open reading frame coding for 265 amino acids. The deduced amino acid sequence of AM-accB contained a biotinylated domain located between amino acids 190 and 263. A. moluccana BCCP shows high identity at the amino acid level to its homologues in other higher plants, such as Vernicia fordii, J. curcas, and Ricinus communis (86, 77, and 70%, respectively), which all contain conserved domains for ACCase activity. The expression of the AM-accB gene during the middle stage of development and maturation in A. moluccana seeds was higher than that in early and later stages. The expression pattern of the AM-accB gene is very similar to that of the oil accumulation rate.

  6. Nicotinic Acetylcholine Receptor α4 Subunit Gene Variation Associated with Attention Deficit Hyperactivity Disorder

    Institute of Scientific and Technical Information of China (English)

    HUANG Xuezhu; XU Yong; LI Qianqian; LIU Pozi; YANG Yuan; ZHANG Fuquan; GUO Tianyou; YANG Chuang; GUO Lanting

    2009-01-01

    Previous pharmacological, human genetics, and animal models have implicated the nicotinic ace-tylcholine receptor a4 subunit (CHRNA4) gene in the pathogenesis of attention deficit/hyperactivity disorder (ADHD). The objective of this study is to examine the genetic association between single nucleotide poly-morphisms in the CHRNA4 gene (rs2273502, rs1044396, rs1044397, and rs3827020 loci) and ADHD. Both case-control and family-based designs are used. Children aged 6 to 16 years were interviewed and as-sessed with the children behavior checklist and the revised conner' parent rating scale to identify probands. No significant differences in the frequency distribution of genotypes or alleles were found between the case and control groups. However, further haplotype analyses showed the CCGG haplotype on dsk for ADHD in 164 case-control samples and the standard transmission disequilibrium test analyses suggest that the allele C of rs2273502 was over-transferred in 98 ADHD parent-offspring tdos. These findings suggest that the CHRNA4 gene may play a role in the pathogenesis of ADHD.

  7. Targeting Activation of Specific NF-κB Subunits Prevents Stress-Dependent Atherothrombotic Gene Expression

    Science.gov (United States)

    Djuric, Zdenka; Kashif, Muhammed; Fleming, Thomas; Muhammad, Sajjad; Piel, David; von Bauer, Rüdiger; Bea, Florian; Herzig, Stephan; Zeier, Martin; Pizzi, Marina; Isermann, Berend; Hecker, Markus; Schwaninger, Markus; Bierhaus, Angelika; Nawroth, Peter P

    2012-01-01

    Psychosocial stress has been shown to be a contributing factor in the development of atherosclerosis. Although the underlying mechanisms have not been elucidated entirely, it has been shown previously that the transcription factor nuclear factor-κB (NF-κB) is an important component of stress-activated signaling pathway. In this study, we aimed to decipher the mechanisms of stress-induced NF-κB-mediated gene expression, using an in vitro and in vivo model of psychosocial stress. Induction of stress led to NF-κB-dependent expression of proinflammatory (tissue factor, intracellular adhesive molecule 1 [ICAM-1]) and protective genes (manganese superoxide dismutase [MnSOD]) via p50, p65 or cRel. Selective inhibition of the different subunits and the respective kinases showed that inhibition of cRel leads to the reduction of atherosclerotic lesions in apolipoprotein−/− (ApoE−/−) mice via suppression of proinflammatory gene expression. This observation may therefore provide a possible explanation for ineffectiveness of antioxidant therapies and suggests that selective targeting of cRel activation may provide a novel approach for the treatment of stress-related inflammatory vascular disease. PMID:23114885

  8. Saturation mutagenesis of Bradyrhizobium sp. BTAi1 toluene 4-monooxygenase at alpha-subunit residues proline 101, proline 103, and histidine 214 for regiospecific oxidation of aromatics.

    Science.gov (United States)

    Yanık-Yıldırım, K Cansu; Vardar-Schara, Gönül

    2014-11-01

    A novel toluene monooxygenase (TMO) six-gene cluster from Bradyrhizobium sp. BTAi1 having an overall 35, 36, and 38 % protein similarity with toluene o-xylene monooxygenase (ToMO) of Pseudomonas sp. OX1, toluene 4-monooxygenase (T4MO) of Pseudomonas mendocina KR1, and toluene-para-monooxygenase (TpMO) of Ralstonia pickettii PKO1, respectively, was cloned and expressed in Escherichia coli TG1, and its potential activity was investigated for aromatic hydroxylation and trichloroethylene (TCE) degradation. The natural substrate toluene was hydroxylated to p-cresol, indicating that the new toluene monooxygenase (T4MO·BTAi1) acts as a para hydroxylating enzyme, similar to T4MO and TpMO. Some shifts in regiospecific hydroxylations were observed compared to the other wild-type TMOs. For example, wild-type T4MO·BTAi1 formed catechol (88 %) and hydroquinone (12 %) from phenol, whereas all the other wild-type TMOs were reported to form only catechol. Furthermore, it was discovered that TG1 cells expressing wild-type T4MO·BTAi1 mineralized TCE at a rate of 0.67 ± 0.10 nmol Cl(-)/h/mg protein. Saturation and site directed mutagenesis were used to generate eight variants of T4MO·BTAi1 at alpha-subunit positions P101, P103, and H214: P101T/P103A, P101S, P101N/P103T, P101V, P103T, P101V/P103T, H214G, and H214G/D278N; by testing the substrates phenol, nitrobenzene, and naphthalene, positions P101 and P103 were found to influence the regiospecific oxidation of aromatics. For example, compared to wild type, variant P103T produced four fold more m-nitrophenol from nitrobenzene as well as produced mainly resorcinol (60 %) from phenol whereas wild-type T4MO·BTAi1 did not. Similarly, variants P101T/P103A and P101S synthesized more 2-naphthol and 2.3-fold and 1.6-fold less 1-naphthol from naphthalene, respectively.

  9. Plant members of the alpha1->3/4-fucosyltransferase gene family encode an alpha1-> 4 fucosyltransferase potentially involved in Lewisa biosynthesis and two core alpha1->3-fucosyltransferases

    NARCIS (Netherlands)

    Bakker, H.; Schijlen, E.; Vries, de T.; Schiphorst, W.E.C.M.; Jordi, W.J.R.M.; Lommen, A.; Bosch, H.J.; Die, van I.

    2001-01-01

    Three putative alpha1-->3/4-fucosyltransferase (alpha1-->3/4-FucT) genes have been detected in the Arabidopsis thaliana genome. The products of two of these genes have been identified in vivo as core alpha1-->3-FucTs involved in N-glycosylation. An orthologue of the third gene was isolated

  10. Prefrontal beta2 subunit-containing and alpha7 nicotinic acetylcholine receptors differentially control glutamatergic and cholinergic signaling.

    Science.gov (United States)

    Parikh, Vinay; Ji, Jinzhao; Decker, Michael W; Sarter, Martin

    2010-03-03

    One-second-long increases in prefrontal cholinergic activity ("transients") were demonstrated previously to be necessary for the incorporation of cues into ongoing cognitive processes ("cue detection"). Nicotine and, more robustly, selective agonists at alpha4beta2* nicotinic acetylcholine receptors (nAChRs) enhance cue detection and attentional performance by augmenting prefrontal cholinergic activity. The present experiments determined the role of beta2-containing and alpha7 nAChRs in the generation of prefrontal cholinergic and glutamatergic transients in vivo. Transients were evoked by nicotine, the alpha4beta2* nAChR agonist ABT-089 [2-methyl-3-(2-(S)-pyrrolindinylmethoxy) pyridine dihydrochloride], or the alpha7 nAChR agonist A-582941 [2-methyl-5-(6-phenyl-pyridazin-3-yl)-octahydro-pyrrolo[3,4-c]pyrrole]. Transients were recorded in mice lacking beta2 or alpha7 nAChRs and in rats after removal of thalamic glutamatergic or midbrain dopaminergic inputs to prefrontal cortex. The main results indicate that stimulation of alpha4beta2* nAChRs evokes glutamate release and that the presence of thalamic afferents is necessary for the generation of cholinergic transients. ABT-089-evoked transients were completely abolished in mice lacking beta2* nAChRs. The amplitude, but not the decay rate, of nicotine-evoked transients was reduced by beta2* knock-out. Conversely, in mice lacking the alpha7 nAChR, the decay rate, but not the amplitude, of nicotine-evoked cholinergic and glutamatergic transients was attenuated. Substantiating the role of alpha7 nAChR in controlling the duration of release events, stimulation of alpha7 nAChR produced cholinergic transients that lasted 10- to 15-fold longer than those evoked by nicotine. alpha7 nAChR-evoked cholinergic transients are mediated in part by dopaminergic activity. Prefrontal alpha4beta2* nAChRs play a key role in evoking and facilitating the transient glutamatergic-cholinergic interactions that are necessary for cue detection

  11. Nuclear life of the voltage-gated Cacnb4 subunit and its role in gene transcription regulation.

    Science.gov (United States)

    Ronjat, Michel; Kiyonaka, Shigeki; Barbado, Maud; De Waard, Michel; Mori, Yasuo

    2013-01-01

    The pore-forming subunit of voltage-gated calcium channels is associated to auxiliary subunits among which the cytoplasmic β subunit. The different isoforms of this subunit control both the plasma membrane targeting and the biophysical properties of the channel moiety. In a recent study, we demonstrated that the Cacnb4 (β 4) isoform is at the center of a new signaling pathway that connects neuronal excitability and gene transcription. This mechanism relies on nuclear targeting of β 4 triggered by neuronal electrical stimulation. This re-localization of β 4 is promoted by its interaction with Ppp2r5d a regulatory subunit of PP2A in complex with PP2A itself. The formation, as well as the nuclear translocation, of the β 4/ Ppp2r5d/ PP2A complex is totally impaired by the premature R482X stops mutation of β 4 that has been previously associated with juvenile epilepsy. Taking as a case study the tyrosine hydroxylase gene that is strongly upregulated in brain of lethargic mice, deficient for β 4 expression, we deciphered the molecular steps presiding to this signaling pathway. Here we show that expression of wild-type β 4 in HEK293 cells results in the regulation of several genes, while expression of the mutated β 4 (β 1-481) produces a different set of gene regulation. Several genes regulated by β 4 in HEK293 cells were also regulated upon neuronal differentiation of NG108-15 cells that induces nuclear translocation of β 4 suggesting a link between β 4 nuclear targeting and gene regulation.

  12. Silencing gamma-aminobutyric acid A receptor alpha 1 subunit expression and outward potassium current in developing cortical neurons

    Institute of Scientific and Technical Information of China (English)

    Tao Bo; Jiang Li; Jian Li; Xingfang Li; Kaihui Xing

    2011-01-01

    We used RNA interference (RNAi) to disrupt synthesis of the cortical neuronal γ-aminobutyric acid A receptor (GABAAR) α1 in rats during development, and measured outward K+ currents during neuronal electrical activity using whole-cell patch-clamp techniques. Three pairs of small interfering RNA (siRNA) for GABAAR α1 subunit were designed using OligoEngine RNAi software. This siRNA was found to effectively inhibited GABAAR α1 mRNA expression in cortical neuronal culture in vitro, but did not significantly affect neuronal survival. Outward K+ currents were decreased, indicating that GABAAR α1 subunits in developing neurons participate in neuronal function by regulating outward K+ current.

  13. Cloning and gene expression of a cDNA for the chicken follicle-stimulating hormone (FSH)-beta-subunit.

    Science.gov (United States)

    Shen, San-Tai; Yu, John Yuh-Lin

    2002-02-15

    Follicle-stimulating hormone (FSH) is a member of pituitary glycoprotein hormones that are composed of two dissimilar subunits, alpha and beta. Very little information is available regarding the nucleotide and amino acid sequence of FSH-beta in avian species. For better understanding of the phylogenic diversity and evolution of FSH molecule, we have isolated and sequenced the complete complementary DNA (cDNA) encoding chicken FSH-beta precursor molecule by reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA end (RACE) methods. The cloned chicken FSH-beta cDNA consists of 2457-bp nucleotides, including 44-bp nucleotides of the 5'-untranslated region (UTR), 396 bp of the open reading frame, and an extraordinarily long 3'-UTR of 2001-bp nucleotides followed by a poly(A)((16)) tail. It encodes a 131-amino-acid precursor molecule of FSH-beta-subunit with a signal peptide of 20 amino acids followed by a mature protein of 111 amino acids. Twelve cysteine residues, forming six disulfide bonds within beta-subunit and two putative asparagine-linked glycosylation sites, are also conserved in the chicken FSH-beta-subunit. Four proline residues, presumably responsible for changing the backbone direction of protein structure, are conserved in chicken FSH-beta-subunit as well. The nucleotide sequence of chicken FSH-beta cDNA shows high homology with quail FSH-beta cDNA, 97% homology in the open reading frame, and 85% homology in the 3'-UTR. The deduced amino acid sequence of chicken FSH-beta-subunit shows a remarkable similarity to other avian FSH-beta-subunits, 98% homology with quail, and 93% homology with ostrich, whereas a lower similarity (66 to 70%) is noted when compared with mammalian FSH-beta-subunits. By contrast, when comparing with the beta-subunits of chicken luteinizing hormone and thyroid-stimulating hormone, the homologies are as low as 37 and 40%, respectively. FSH-beta mRNA was only expressed in pituitary gland out of various

  14. A novel mutation in the succinate dehydrogenase subunit D gene in siblings with the hereditary paraganglioma-pheochromocytoma syndrome.

    Science.gov (United States)

    Prasad, Chaithra; Oakley, Gerard J; Yip, Linwah; Coyne, Christopher; Rangaswamy, Balasubramanya; Dixit, Sanjay B

    2014-01-01

    Germline mutations in the succinate dehydrogenase complex subunit D gene are now known to be associated with hereditary paraganglioma-pheochromocytoma syndromes. Since the initial succinate dehydrogenase complex subunit D gene mutation was identified about a decade ago, more than 131 unique variants have been reported. We report the case of two siblings presenting with multiple paragangliomas and pheochromocytomas; they were both found to carry a mutation in the succinate dehydrogenase complex subunit D gene involving a substitution of thymine to guanine at nucleotide 236 in exon 3. This particular mutation of the succinate dehydrogenase complex subunit D gene has only been reported in one previous patient in Japan; this is, therefore, the first report of this pathogenic mutation in siblings and the first report of this mutation in North America. With continued screening of more individuals, we will be able to create a robust mutation database that can help us understand disease patterns associated with particular variants and may be a starting point in the development of new therapies for familial paraganglioma syndromes.

  15. A novel mutation in the succinate dehydrogenase subunit D gene in siblings with the hereditary paraganglioma–pheochromocytoma syndrome

    Directory of Open Access Journals (Sweden)

    Chaithra Prasad

    2014-10-01

    Full Text Available Germline mutations in the succinate dehydrogenase complex subunit D gene are now known to be associated with hereditary paraganglioma–pheochromocytoma syndromes. Since the initial succinate dehydrogenase complex subunit D gene mutation was identified about a decade ago, more than 131 unique variants have been reported. We report the case of two siblings presenting with multiple paragangliomas and pheochromocytomas; they were both found to carry a mutation in the succinate dehydrogenase complex subunit D gene involving a substitution of thymine to guanine at nucleotide 236 in exon 3. This particular mutation of the succinate dehydrogenase complex subunit D gene has only been reported in one previous patient in Japan; this is, therefore, the first report of this pathogenic mutation in siblings and the first report of this mutation in North America. With continued screening of more individuals, we will be able to create a robust mutation database that can help us understand disease patterns associated with particular variants and may be a starting point in the development of new therapies for familial paraganglioma syndromes.

  16. A novel mutation in the succinate dehydrogenase subunit D gene in siblings with the hereditary paraganglioma–pheochromocytoma syndrome

    Science.gov (United States)

    Oakley, Gerard J; Yip, Linwah; Coyne, Christopher; Rangaswamy, Balasubramanya; Dixit, Sanjay B

    2014-01-01

    Germline mutations in the succinate dehydrogenase complex subunit D gene are now known to be associated with hereditary paraganglioma–pheochromocytoma syndromes. Since the initial succinate dehydrogenase complex subunit D gene mutation was identified about a decade ago, more than 131 unique variants have been reported. We report the case of two siblings presenting with multiple paragangliomas and pheochromocytomas; they were both found to carry a mutation in the succinate dehydrogenase complex subunit D gene involving a substitution of thymine to guanine at nucleotide 236 in exon 3. This particular mutation of the succinate dehydrogenase complex subunit D gene has only been reported in one previous patient in Japan; this is, therefore, the first report of this pathogenic mutation in siblings and the first report of this mutation in North America. With continued screening of more individuals, we will be able to create a robust mutation database that can help us understand disease patterns associated with particular variants and may be a starting point in the development of new therapies for familial paraganglioma syndromes. PMID:27489656

  17. Frequent germ-line succinate dehydrogenase subunit D gene mutations in patients with apparently sporadic parasympathetic paraganglioma

    NARCIS (Netherlands)

    H. Dannenberg (Hilde); W.N.M. Dinjens (Winand); M. Abbou; H. van Urk (Hero); B.K. Pauw; D. Mouwen; W.J. Mooi (Wolter); R.R. de Krijger (Ronald)

    2002-01-01

    textabstractPURPOSE: Recently, familial paraganglioma (PGL) was shown to be caused bymutations in the gene encoding succinate dehydrogenase subunit D (SDHD). However, the prevalence of SDHD mutations in apparently sporadic PGL is unknown. We studied the frequency and spectrum of ge

  18. Characterization of the low-molecular-weight glutenin subunit gene family members using a PCR-based marker approach

    Science.gov (United States)

    Low-molecular-weight glutenin subunits (LMW-GS) are a class of seed storage proteins that play a major role in the determination of the processing quality of wheat flour. The LMW-GS are encoded by multi-gene families located on the short arms of the homoeologous group 1 chromosomes, at the Glu-A3, G...

  19. Structure and expression of alpha-amylase gene from Vigna mungo.

    Science.gov (United States)

    Yamauchi, D; Takeuchi, H; Minamikawa, T

    1994-06-01

    A single copy of the alpha-amylase gene, composed of three introns and four exons, was found in Vigna mungo. Examination of levels of alpha-amylase and its mRNA in detached cotyledons indicated that attachment of the embryonic axis is not required for expression of the gene in cotyledons of germinating seeds.

  20. Peroxisome Proliferator-Activated Receptor Alpha Target Genes

    NARCIS (Netherlands)

    Rakhshandehroo, M.; Knoch, B.; Müller, M.R.; Kersten, A.H.

    2010-01-01

    The peroxisome proliferator-activated receptor alpha (PPAR alpha) is a ligand-activated transcription factor involved in the regulation of a variety of processes, ranging from inflammation and immunity to nutrient metabolism and energy homeostasis. PPAR alpha serves as a molecular target for hypolip

  1. Peroxisome Proliferator-Activated Receptor Alpha Target Genes

    NARCIS (Netherlands)

    Rakhshandehroo, M.; Knoch, B.; Müller, M.R.; Kersten, A.H.

    2010-01-01

    The peroxisome proliferator-activated receptor alpha (PPAR alpha) is a ligand-activated transcription factor involved in the regulation of a variety of processes, ranging from inflammation and immunity to nutrient metabolism and energy homeostasis. PPAR alpha serves as a molecular target for

  2. Molecular evolution of the cytochrome c oxidase subunit 5A gene in primates

    Directory of Open Access Journals (Sweden)

    Wildman Derek E

    2008-01-01

    Full Text Available Abstract Background Many electron transport chain (ETC genes show accelerated rates of nonsynonymous nucleotide substitutions in anthropoid primate lineages, yet in non-anthropoid lineages the ETC proteins are typically highly conserved. Here, we test the hypothesis that COX5A, the ETC gene that encodes cytochrome c oxidase subunit 5A, shows a pattern of anthropoid-specific adaptive evolution, and investigate the distribution of this protein in catarrhine brains. Results In a dataset comprising 29 vertebrate taxa, including representatives from all major groups of primates, there is nearly 100% conservation of the COX5A amino acid sequence among extant, non-anthropoid placental mammals. The most recent common ancestor of these species lived about 100 million years (MY ago. In contrast, anthropoid primates show markedly elevated rates of nonsynonymous evolution. In particular, branch site tests identify five positively selected codons in anthropoids, and ancestral reconstructions infer that substitutions in these codons occurred predominantly on stem lineages (anthropoid, ape and New World monkey and on the human terminal branch. Examination of catarrhine brain samples by immunohistochemistry characterizes for the first time COX5A protein distribution in the primate neocortex, and suggests that the protein is most abundant in the mitochondria of large-size projection neurons. Real time quantitative PCR supports previous microarray results showing COX5A is expressed in cerebral cortical tissue at a higher level in human than in chimpanzee or gorilla. Conclusion Taken together, these results suggest that both protein structural and gene regulatory changes contributed to COX5A evolution during humankind's ancestry. Furthermore, these findings are consistent with the hypothesis that adaptations in ETC genes contributed to the emergence of the energetically expensive anthropoid neocortex.

  3. An ancient repeat sequence in the ATP synthase beta-subunit gene of forcipulate sea stars.

    Science.gov (United States)

    Foltz, David W

    2007-11-01

    A novel repeat sequence with a conserved secondary structure is described from two nonadjacent introns of the ATP synthase beta-subunit gene in sea stars of the order Forcipulatida (Echinodermata: Asteroidea). The repeat is present in both introns of all forcipulate sea stars examined, which suggests that it is an ancient feature of this gene (with an approximate age of 200 Mya). Both stem and loop regions show high levels of sequence constraint when compared to flanking nonrepetitive intronic regions. The repeat was also detected in (1) the family Pterasteridae, order Velatida and (2) the family Korethrasteridae, order Velatida. The repeat was not detected in (1) the family Echinasteridae, order Spinulosida, (2) the family Astropectinidae, order Paxillosida, (3) the family Solasteridae, order Velatida, or (4) the family Goniasteridae, order Valvatida. The repeat lacks similarity to published sequences in unrestricted GenBank searches, and there are no significant open reading frames in the repeat or in the flanking intron sequences. Comparison via parametric bootstrapping to a published phylogeny based on 4.2 kb of nuclear and mitochondrial sequence for a subset of these species allowed the null hypothesis of a congruent phylogeny to be rejected for each repeat, when compared separately to the published phylogeny. In contrast, the flanking nonrepetitive sequences in each intron yielded separate phylogenies that were each congruent with the published phylogeny. In four species, the repeat in one or both introns has apparently experienced gene conversion. The two introns also show a correlated pattern of nucleotide substitutions, even after excluding the putative cases of gene conversion.

  4. Function of Partially Duplicated Human α7 Nicotinic Receptor Subunit CHRFAM7A Gene

    Science.gov (United States)

    de Lucas-Cerrillo, Ana M.; Maldifassi, M. Constanza; Arnalich, Francisco; Renart, Jaime; Atienza, Gema; Serantes, Rocío; Cruces, Jesús; Sánchez-Pacheco, Aurora; Andrés-Mateos, Eva; Montiel, Carmen

    2011-01-01

    The neuronal α7 nicotinic receptor subunit gene (CHRNA7) is partially duplicated in the human genome forming a hybrid gene (CHRFAM7A) with the novel FAM7A gene. The hybrid gene transcript, dupα7, has been identified in brain, immune cells, and the HL-60 cell line, although its translation and function are still unknown. In this study, dupα7 cDNA has been cloned and expressed in GH4C1 cells and Xenopus oocytes to study the pattern and functional role of the expressed protein. Our results reveal that dupα7 transcript was natively translated in HL-60 cells and heterologously expressed in GH4C1 cells and oocytes. Injection of dupα7 mRNA into oocytes failed to generate functional receptors, but when co-injected with α7 mRNA at α7/dupα7 ratios of 5:1, 2:1, 1:1, 1:5, and 1:10, it reduced the nicotine-elicited α7 current generated in control oocytes (α7 alone) by 26, 53, 75, 93, and 94%, respectively. This effect is mainly due to a reduction in the number of functional α7 receptors reaching the oocyte membrane, as deduced from α-bungarotoxin binding and fluorescent confocal assays. Two additional findings open the possibility that the dominant negative effect of dupα7 on α7 receptor activity observed in vitro could be extrapolated to in vivo situations. (i) Compared with α7 mRNA, basal dupα7 mRNA levels are substantial in human cerebral cortex and higher in macrophages. (ii) dupα7 mRNA levels in macrophages are down-regulated by IL-1β, LPS, and nicotine. Thus, dupα7 could modulate α7 receptor-mediated synaptic transmission and cholinergic anti-inflammatory response. PMID:21047781

  5. ASSIGNMENT OF THE GENE CODING FOR HUMAN CYTOCHROME-C-OXIDASE SUBUNIT-VIB TO CHROMOSOME-19, BAND-Q13.1, BY FLUORESCENCE INSITU HYBRIDIZATION

    NARCIS (Netherlands)

    TAANMAN, JW; VANDERVEEN, AY; SCHRAGE, C; DEVRIES, H; BUYS, CHCM

    1991-01-01

    A cloned, 40 kb, genomic DNA fragment, containing the last exon of the gene for human cytochrome c oxidase subunit VIb and its flanking sequences, was used as a probe to localize the subunit VIb gene on human metaphase chromosomes. The probe was labelled with Bio-11-dUTP and detected by fluorescence

  6. Complete inhibition of the tentoxin-resistant F1-ATPase from Escherichia coli by the phytopathogenic inhibitor tentoxin after substitution of critical residues in the alpha - and beta -subunit.

    Science.gov (United States)

    Schnick, Claudia; Körtgen, Nicole; Groth, Georg

    2002-12-27

    Substitution of critical residues in the alpha- and beta-subunit can turn the typically resistant ATP synthase from the bacterium Escherichia coli into an enzyme showing high sensitivity to the phytopathogenic inhibitor tentoxin, which usually affects only certain sensitive plant species. In contrast to recent results obtained with the thermophilic F(1) (Groth, G., Hisabori, T., Lill, H., and Bald, D. (2002) J. Biol. Chem. 277, 20117-20119), substitution of a critical serine in the beta-subunit (betaSer(59)), which is supposed to provide an important intermolecular hydrogen bond in the binding site, was not sufficient on its own for conferring tentoxin sensitivity to the E. coli F(1) complex. Superimposition of the chloroplast F(1)-tentoxin inhibitor complex on a homology model of the E. coli F(1) complex provided detailed information on the critical residues in the alpha-subunit of the binding cleft and allowed us to model the binding site according to the steric requirements of the inhibitor. Substitution of the highly conserved residue alphaLeu(64) seems to be most important for allowing access of the inhibitor to the binding site. Combining this substitution with either additional replacements in the alpha-subunit (Q49A, L95A, E96Q, I273M) or the replacement of Ser(59) in the beta-subunit enhanced the sensitivity to the inhibitor and resulted in a complete inhibition of the E. coli F(1)-ATPase by the plant-specific inhibitor tentoxin.

  7. The vertebrate ancestral repertoire of visual opsins, transducin alpha subunits and oxytocin/vasopressin receptors was established by duplication of their shared genomic region in the two rounds of early vertebrate genome duplications.

    Science.gov (United States)

    Lagman, David; Ocampo Daza, Daniel; Widmark, Jenny; Abalo, Xesús M; Sundström, Görel; Larhammar, Dan

    2013-11-02

    Vertebrate color vision is dependent on four major color opsin subtypes: RH2 (green opsin), SWS1 (ultraviolet opsin), SWS2 (blue opsin), and LWS (red opsin). Together with the dim-light receptor rhodopsin (RH1), these form the family of vertebrate visual opsins. Vertebrate genomes contain many multi-membered gene families that can largely be explained by the two rounds of whole genome duplication (WGD) in the vertebrate ancestor (2R) followed by a third round in the teleost ancestor (3R). Related chromosome regions resulting from WGD or block duplications are said to form a paralogon. We describe here a paralogon containing the genes for visual opsins, the G-protein alpha subunit families for transducin (GNAT) and adenylyl cyclase inhibition (GNAI), the oxytocin and vasopressin receptors (OT/VP-R), and the L-type voltage-gated calcium channels (CACNA1-L). Sequence-based phylogenies and analyses of conserved synteny show that the above-mentioned gene families, and many neighboring gene families, expanded in the early vertebrate WGDs. This allows us to deduce the following evolutionary scenario: The vertebrate ancestor had a chromosome containing the genes for two visual opsins, one GNAT, one GNAI, two OT/VP-Rs and one CACNA1-L gene. This chromosome was quadrupled in 2R. Subsequent gene losses resulted in a set of five visual opsin genes, three GNAT and GNAI genes, six OT/VP-R genes and four CACNA1-L genes. These regions were duplicated again in 3R resulting in additional teleost genes for some of the families. Major chromosomal rearrangements have taken place in the teleost genomes. By comparison with the corresponding chromosomal regions in the spotted gar, which diverged prior to 3R, we could time these rearrangements to post-3R. We present an extensive analysis of the paralogon housing the visual opsin, GNAT and GNAI, OT/VP-R, and CACNA1-L gene families. The combined data imply that the early vertebrate WGD events contributed to the evolution of vision and the

  8. Chromogranin A as serum marker for neuroendocrine neoplasia: comparison with neuron-specific enolase and the alpha-subunit of glycoprotein hormones.

    Science.gov (United States)

    Nobels, F R; Kwekkeboom, D J; Coopmans, W; Schoenmakers, C H; Lindemans, J; De Herder, W W; Krenning, E P; Bouillon, R; Lamberts, S W

    1997-08-01

    Chromogranin A (CgA) is gaining acceptance as a serum marker of neuroendocrine tumors. Its specificity in differentiating between neuroendocrine and nonneuroendocrine tumors, its sensitivity to detect small tumors, and its clinical value, compared with other neuroendocrine markers, have not clearly been defined, however. The objectives of this study were to evaluate the clinical usefulness of CgA as neuroendocrine serum marker. Serum levels of CgA, neuron-specific enolase (NSE), and the alpha-subunit of glycoprotein hormones (alpha-SU) were determined in 211 patients with neuroendocrine tumors and 180 control subjects with nonendocrine tumors. The concentrations of CgA, NSE, and alpha-SU were elevated in 50%, 43%, and 24% of patients with neuroendocrine tumors, respectively. Serum CgA was most frequently increased in subjects with gastrinomas (100%), pheochromocytomas (89%), carcinoid tumors (80%), nonfunctioning tumors of the endocrine pancreas (69%), and medullary thyroid carcinomas (50%). The highest levels were observed in subjects with carcinoid tumors. NSE was most frequently elevated in patients with small cell lung carcinoma (74%), and alpha-SU was most frequently elevated in patients with carcinoid tumors (39%). Most subjects with elevated alpha-SU levels also had elevated CgA concentrations. A significant positive relationship was demonstrated between the tumor load and serum CgA levels (P NSE, and alpha-SU were present in, respectively, 7%, 35%, and 15% of control subjects. Markedly elevated serum levels of CgA, exceeding 300 micrograms/L, were observed in only 2% of control patients (n = 3) compared to 40% of patients with neuroendocrine tumors (n = 76). We conclude that CgA is the best general neuroendocrine serum marker available. It has the highest specificity for the detection of neuroendocrine tumors compared to the other neuroendocrine markers, NSE and alpha-SU. Elevated levels are strongly correlated with tumor volume; therefore, small tumors may

  9. Gene for the catalytic subunit of mouse DNA-dependent protein kinase maps to the scid locus.

    Science.gov (United States)

    Miller, R D; Hogg, J; Ozaki, J H; Gell, D; Jackson, S P; Riblet, R

    1995-01-01

    The gene encoding the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs) has been proposed recently as a candidate gene for the mouse severe combined immune deficiency (scid) locus. We have used a partial cDNA clone for human DNA-PKcs to map the mouse homologue using a large interspecific backcross panel. We found that the mouse gene for DNA-PKcs does not recombine with scid, consistent with the hypothesis that scid is a mutation in the mouse gene for DNA-PKcs. Images Fig. 3 PMID:7479885

  10. Molecular evolution at the cytochrome oxidase subunit 2 gene among divergent populations of the intertidal copepod, Tigriopus californicus.

    Science.gov (United States)

    Rawson, Paul D; Burton, Ronald S

    2006-06-01

    The cytochrome c oxidase subunit 2 gene (COII) encodes a highly conserved protein that is directly responsible for the initial transfer of electrons from cytochrome c to cytochrome c oxidase (COX) crucial to the production of ATP during cellular respiration. Despite its integral role in electron transport, we have observed extensive intraspecific nucleotide and amino acid variation among 26 full-length COII sequences sampled from seven populations of the marine copepod, Tigriopus californicus. Although intrapopulation divergence was virtually nonexistent, interpopulation divergence at the COII locus was nearly 20% at the nucleotide level, including 38 nonsynonymous substitutions. Given the high degree of interaction between the cytochrome c oxidase subunit 2 protein (COX2) and the nuclear-encoded subunits of COX and cytochrome c (CYC), we hypothesized that some codons in the COII gene are likely to be under positive selection in order to compensate for amino acid substitutions in other subunits. Estimates of the ratio of nonsynonymous to synonymous substitution (omega), obtained using a series of maximum likelihood models of codon substitution, indicated that the majority of codons in T. californicus COII are under strong purifying selection (omega < 1), while approximately 4% of the sites in this gene appear to evolve under relaxed selective constraint (omega = 1). A branch-site maximum likelihood model identified three sites that may have experienced positive selection within the central California sequence clade in our COII phylogeny; these results are consistent with previous studies showing functional and fitness consequences among interpopulation hybrids between central and northern California populations.

  11. Phosphatidylinositol 3-kinase p85 regulatory subunit gene and spinal muscular atrophy disease

    Directory of Open Access Journals (Sweden)

    Monica STAVARACHI

    2009-11-01

    Full Text Available Spinal muscular atrophy (SMA is a frequent neuromuscular disorder caused by motoneuronal apoptosis, as a result of SMN (Survival Motor Neuron protein deficiency. Although the SMA determining gene was identified, the molecular mechanism of the disease is not clearly understood, due to the heterogeneity of clinical manifestations. Trying to complete the molecular describing SMA picture, by identifying potential modulators factors, we investigated the relationship between phosphatidylinositol 3-kinase p85 regulatory subunit gene (PIK3R1 and SMA pathology. As IGF signaling pathway has been reported to play an important role in motoneurons survival and PIK3 is a key element of this cascade signaling, we focused on the relationship between PIK3R1 gene Met326Ile polymorphism and SMA type I, the most severe form of the disease. A total of 80 subjects (40 SMA type I patients and 40 unrelated healthy controls were included in the study. The statistical analyzes performed consequently to the genotyping by mismatch PCR-RFLP method, revealed that Met326Ile polymorphism is not associated with SMA type I disease: ORMet/Met = 0.398 with a p = 0.072 meanwhile ORMet = 0.495, p = 0.063. However, the Cochrane – Armitage test indicated that there is a statistically association trend between the analyzed polymorphism and SMA type I pathology: ORMet = 0.438, p = 0.032. We concluded that additional researches with an increased subjects number and replicates studies in other populations will clarify the investigated relationship and it may contribute to the SMA molecular mechanism understanding.

  12. Isolation and characterization of BetaM protein encoded by ATP1B4 - a unique member of the Na,K-ATPase {beta}-subunit gene family

    Energy Technology Data Exchange (ETDEWEB)

    Pestov, Nikolay B. [Department of Physiology and Pharmacology, University of Toledo College of Medicine, 3000 Arlington Ave., Toledo, OH 43614 (United States); Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow 117997 (Russian Federation); Zhao, Hao [Department of Physiology and Pharmacology, University of Toledo College of Medicine, 3000 Arlington Ave., Toledo, OH 43614 (United States); Basrur, Venkatesha [Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109 (United States); Modyanov, Nikolai N., E-mail: nikolai.modyanov@utoledo.edu [Department of Physiology and Pharmacology, University of Toledo College of Medicine, 3000 Arlington Ave., Toledo, OH 43614 (United States)

    2011-09-09

    Highlights: {yields} Structural properties of BetaM and Na,K-ATPase {beta}-subunits are sharply different. {yields} BetaM protein is concentrated in nuclear membrane of skeletal myocytes. {yields} BetaM does not associate with a Na,K-ATPase {alpha}-subunit in skeletal muscle. {yields} Polypeptide chain of the native BetaM is highly sensitive to endogenous proteases. {yields} BetaM in neonatal muscle is a product of alternative splice mRNA variant B. -- Abstract: ATP1B4 genes represent a rare instance of the orthologous gene co-option that radically changed functions of encoded BetaM proteins during vertebrate evolution. In lower vertebrates, this protein is a {beta}-subunit of Na,K-ATPase located in the cell membrane. In placental mammals, BetaM completely lost its ancestral role and through acquisition of two extended Glu-rich clusters into the N-terminal domain gained entirely new properties as a muscle-specific protein of the inner nuclear membrane possessing the ability to regulate gene expression. Strict temporal regulation of BetaM expression, which is the highest in late fetal and early postnatal myocytes, indicates that it plays an essential role in perinatal development. Here we report the first structural characterization of the native eutherian BetaM protein. It should be noted that, in contrast to structurally related Na,K-ATPase {beta}-subunits, the polypeptide chain of BetaM is highly sensitive to endogenous proteases that greatly complicated its isolation. Nevertheless, using a complex of protease inhibitors, a sample of authentic BetaM was isolated from pig neonatal skeletal muscle by a combination of ion-exchange and lectin-affinity chromatography followed by SDS-PAGE. Results of the analysis of the BetaM tryptic digest using MALDI-TOF and ESI-MS/MS mass spectrometry have demonstrated that native BetaM in neonatal skeletal muscle is a product of alternative splice mRNA variant B and comprised of 351 amino acid residues. Isolated BetaM protein was

  13. alpha-Globin genes: thalassemic and structural alterations in a Brazilian population

    Directory of Open Access Journals (Sweden)

    M.R.S.C. Wenning

    2000-09-01

    Full Text Available Seven unrelated patients with hemoglobin (Hb H disease and 27 individuals with alpha-chain structural alterations were studied to identify the alpha-globin gene mutations present in the population of Southeast Brazil. The -alpha3.7, --MED and -(alpha20.5 deletions were investigated by PCR, whereas non-deletional alpha-thalassemia (alphaHphalpha, alphaNcoIalpha, aaNcoI, alphaIcalpha and alphaTSaudialpha was screened with restriction enzymes and by nested PCR. Structural alterations were identified by direct DNA sequencing. Of the seven patients with Hb H disease, all of Italian descent, two had the -(alpha20.5/-alpha3.7 genotype, one had the --MED/-alpha3.7 genotype, one had the --MED/alphaHphalpha genotype and three showed interaction of the -alpha3.7 deletion with an unusual, unidentified form of non-deletional alpha-thalassemia [-alpha3.7/(aaT]. Among the 27 patients with structural alterations, 15 (of Italian descent had Hb Hasharon (alpha47Asp->His associated with the -alpha3.7 deletion, 4 (of Italian descent were heterozygous for Hb J-Rovigo (alpha53Ala->Asp, 4 (3 Blacks and 1 Caucasian were heterozygous for Hb Stanleyville-II (alpha78Asn->Lys associated with the alpha+-thalassemia, 1 (Black was heterozygous for Hb G-Pest (alpha74Asp->Asn, 1 (Caucasian was heterozygous for Hb Kurosaki (alpha7Lys->Glu, 1 (Caucasian was heterozygous for Hb Westmead (alpha122His->Gln, and 1 (Caucasian was the carrier of a novel silent variant (Hb Campinas, alpha26Ala->Val. Most of the mutations found reflected the Mediterranean and African origins of the population. Hbs G-Pest and Kurosaki, very rare, and Hb Westmead, common in southern China, were initially described in individuals of ethnic origin differing from those of the carriers reported in the present study and are the first cases to be reported in the Brazilian population.

  14. Autosomal dominant erythermalgia associated with a novel mutation in the voltage-gated sodium channel alpha subunit Nav1.7.

    Science.gov (United States)

    Michiels, Jan J; te Morsche, Rene H M; Jansen, Jan B M J; Drenth, Joost P H

    2005-10-01

    Autosomal dominant primary erythermalgia is a rare disorder characterized by recurrent attacks of red, warm, and painful hands and/or feet. To describe the phenotypes and molecular data of a 10-member family with 5 symptomatic living patients with erythermalgia. The clinical phenotype of this family was featured by episodic or continuous symmetrical red swelling, irritating warmth, and burning pain of feet and lower legs provoked or aggravated by warmth and exercise, and relief was always obtained by application of cold, such as putting feet in (ice-) cold water. The symptoms in this family were only partially controlled by analgesics and sedatives. All affected family members were heterozygous for a novel mutation (S241T) of the voltage-gated sodium channel alpha subunit Nav1.7. Primary erythermalgia may be a neuropathic disorder of the small peripheral sensory and sympathetic neurons, and may be caused by hyperexcitability of Nav1.7.

  15. Reduced volume and increased training intensity elevate muscle Na+/K+ pump {alpha}2-subunit expression as well as short- and long-term work capacity in humans

    DEFF Research Database (Denmark)

    Bangsbo, Jens; Gunnarsson, Thomas Petursson; Wendell, Jesper;

    2009-01-01

    The present study examined muscle adaptations and alterations in work capacity in endurance-trained runners as a result of a reduced amount of training combined with speed endurance training. Seventeen runners were for a 6- to 9-wk period assigned to either a speed endurance group with a 25......% reduction in the amount of training but including speed endurance training consisting of 6-12 30-s sprint runs 3-4 times a week (SET, n=12) or a control group (CON, n=5), which continued the endurance training (about 55 km(.)wk(-1)). For SET the expression of the muscle Na(+)/K(+) pump alpha2-subunit was 68......% higher (Ptraining period. In SET, VO2-max...

  16. Effects of alpha-AMPK knockout on exercise-induced gene activation in mouse skeletal muscle.

    Science.gov (United States)

    Jørgensen, Sebastian B; Wojtaszewski, Jørgen F P; Viollet, Benoit; Andreelli, Fabrizio; Birk, Jesper B; Hellsten, Ylva; Schjerling, Peter; Vaulont, Sophie; Neufer, P Darrell; Richter, Erik A; Pilegaard, Henriette

    2005-07-01

    We tested the hypothesis that 5'AMP-activated protein kinase (AMPK) plays an important role in regulating the acute, exercise-induced activation of metabolic genes in skeletal muscle, which were dissected from whole-body alpha2- and alpha1-AMPK knockout (KO) and wild-type (WT) mice at rest, after treadmill running (90 min), and in recovery. Running increased alpha1-AMPK kinase activity, phosphorylation (P) of AMPK, and acetyl-CoA carboxylase (ACC)beta in alpha2-WT and alpha2-KO muscles and increased alpha2-AMPK kinase activity in alpha2-WT. In alpha2-KO muscles, AMPK-P and ACCbeta-P were markedly lower compared with alpha2-WT. However, in alpha1-WT and alpha1-KO muscles, AMPK-P and ACCbeta-P levels were identical at rest and increased similarly during exercise in the two genotypes. The alpha2-KO decreased peroxisome-proliferator-activated receptor gamma coactivator (PGC)-1alpha, uncoupling protein-3 (UCP3), and hexokinase II (HKII) transcription at rest but did not affect exercise-induced transcription. Exercise increased the mRNA content of PGC-1alpha, Forkhead box class O (FOXO)1, HKII, and pyruvate dehydrogenase kinase 4 (PDK4) similarly in alpha2-WT and alpha2-KO mice, whereas glucose transporter GLUT 4, carnitine palmitoyltransferase 1 (CPTI), lipoprotein lipase, and UCP3 mRNA were unchanged by exercise in both genotypes. CPTI mRNA was lower in alpha2-KO muscles than in alpha2-WT muscles at all time-points. In alpha1-WT and alpha1-KO muscles, running increased the mRNA content of PGC-1alpha and FOXO1 similarly. The alpha2-KO was associated with lower muscle adenosine 5'-triphosphate content, and the inosine monophosphate content increased substantially at the end of exercise only in alpha2-KO muscles. In addition, subcutaneous injection of 5-aminoimidazole-4-carboxamide-1-beta-4-ribofuranoside (AICAR) increased the mRNA content of PGC-1alpha, HKII, FOXO1, PDK4, and UCP3, and alpha2-KO abolished the AICAR-induced increases in PGC-1alpha and HKII mRNA. In

  17. Differential expression of genes encoding neuronal ion-channel subunits in major depression, bipolar disorder and schizophrenia: implications for pathophysiology.

    Science.gov (United States)

    Smolin, Bella; Karry, Rachel; Gal-Ben-Ari, Shunit; Ben-Shachar, Dorit

    2012-08-01

    Evidence concerning ion-channel abnormalities in the pathophysiology of common psychiatric disorders is still limited. Given the significance of ion channels in neuronal activity, neurotransmission and neuronal plasticity we hypothesized that the expression patterns of genes encoding different ion channels may be altered in schizophrenia, bipolar and unipolar disorders. Frozen samples of striatum including the nucleus accumbens (Str-NAc) and the lateral cerebellar hemisphere of 60 brains from depressed (MDD), bipolar (BD), schizophrenic and normal subjects, obtained from the Stanley Foundation Brain Collection, were assayed. mRNA of 72 different ion-channel subunits were determined by qRT-PCR and alteration in four genes were verified by immunoblotting. In the Str-NAc the prominent change was observed in the MDD group, in which there was a significant up-regulation in genes encoding voltage-gated potassium-channel subunits. However, in the lateral cerebellar hemisphere (cerebellum), the main change was observed in schizophrenia specimens, as multiple genes encoding various ion-channel subunits were significantly down-regulated. The impaired expression of genes encoding ion channels demonstrates a disease-related neuroanatomical pattern. The alterations observed in Str-NAc of MDD may imply electrical hypo-activity of this region that could be of relevance to MDD symptoms and treatment. The robust unidirectional alteration of both excitatory and inhibitory ion channels in the cerebellum may suggests cerebellar general hypo-transcriptional activity in schizophrenia.

  18. Comparative study of the distribution of the alpha-subunits of voltage-gated sodium channels in normal and axotomized rat dorsal root ganglion neurons.

    Science.gov (United States)

    Fukuoka, Tetsuo; Kobayashi, Kimiko; Yamanaka, Hiroki; Obata, Koichi; Dai, Yi; Noguchi, Koichi

    2008-09-10

    We compared the distribution of the alpha-subunit mRNAs of voltage-gated sodium channels Nav1.1-1.3 and Nav1.6-1.9 and a related channel, Nax, in histochemically identified neuronal subpopulations of the rat dorsal root ganglia (DRG). In the naïve DRG, the expression of Nav1.1 and Nav1.6 was restricted to A-fiber neurons, and they were preferentially expressed by TrkC neurons, suggesting that proprioceptive neurons possess these channels. Nav1.7, -1.8, and -1.9 mRNAs were more abundant in C-fiber neurons compared with A-fiber ones. Nax was evenly expressed in both populations. Although Nav1.8 and -1.9 were preferentially expressed by TrkA neurons, other alpha-subunits were expressed independently of TrkA expression. Actually, all IB4(+) neurons expressed both Nav1.8 and -1.9, and relatively limited subpopulations of IB4(+) neurons (3% and 12%, respectively) expressed Nav1.1 and/or Nav1.6. These findings provide useful information in interpreting the electrophysiological characteristics of some neuronal subpopulations of naïve DRG. After L5 spinal nerve ligation, Nav1.3 mRNA was up-regulated mainly in A-fiber neurons in the ipsilateral L5 DRG. Although previous studies demonstrated that nerve growth factor (NGF) and glial cell-derived neurotrophic factor (GDNF) reversed this up-regulation, the Nav1.3 induction was independent of either TrkA or GFRalpha1 expression, suggesting that the induction of Nav1.3 may be one of the common responses of axotomized DRG neurons without a direct relationship to NGF/GDNF supply. (c) 2008 Wiley-Liss, Inc.

  19. Structural bases of dimerization of yeast telomere protein Cdc13 and its interaction with the catalytic subunit of DNA polymerase [alpha

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Jia; Yang, Yuting; Wan, Ke; Mao, Ninghui; Yu, Tai-Yuan; Lin, Yi-Chien; DeZwaan, Diane C.; Freeman, Brian C.; Lin, Jing-Jer; Lue, Neal F.; Lei, Ming

    2011-08-24

    Budding yeast Cdc13-Stn1-Ten1 (CST) complex plays an essential role in telomere protection and maintenance, and has been proposed to be a telomere-specific replication protein A (RPA)-like complex. Previous genetic and structural studies revealed a close resemblance between Stn1-Ten1 and RPA32-RPA14. However, the relationship between Cdc13 and RPA70, the largest subunit of RPA, has remained unclear. Here, we report the crystal structure of the N-terminal OB (oligonucleotide/oligosaccharide binding) fold of Cdc13. Although Cdc13 has an RPA70-like domain organization, the structures of Cdc13 OB folds are significantly different from their counterparts in RPA70, suggesting that they have distinct evolutionary origins. Furthermore, our structural and biochemical analyses revealed unexpected dimerization by the N-terminal OB fold and showed that homodimerization is probably a conserved feature of all Cdc13 proteins. We also uncovered the structural basis of the interaction between the Cdc13 N-terminal OB fold and the catalytic subunit of DNA polymerase {alpha} (Pol1), and demonstrated a role for Cdc13 dimerization in Pol1 binding. Analysis of the phenotypes of mutants defective in Cdc13 dimerization and Cdc13-Pol1 interaction revealed multiple mechanisms by which dimerization regulates telomere lengths in vivo. Collectively, our findings provide novel insights into the mechanisms and evolution of Cdc13.

  20. Structure-function relationships in the Na,K-ATPase. cap alpha. subunit: site-directed mutagenesis of glutamine-111 to arginine and asparagine-122 to aspartic acid generates a ouabain-resistant enzyme

    Energy Technology Data Exchange (ETDEWEB)

    Price, E.M.; Lingrel, J.B.

    1988-11-01

    Na,K-ATPases from various species differ greatly in their sensitivity to cardiac glycosides such as ouabain. The sheep and human enzymes are a thousand times more sensitive than the corresponding ones from rat and mouse. To define the region of the ..cap alpha..1 subunit responsible for this differential sensitivity, chimeric cDNAs of sheep and rat were constructed and expressed in ouabain-sensitive HeLa cells. The construct containing the amino-terminal half of the rat ..cap alpha..1 subunit coding region and carboxyl-terminal half of the sheep conferred the ouabain-resistant phenotype to HeLa cells while the reverse construct did not. This indicates that the determinants involved in ouabain sensitivity are located in the amino-terminal half of the Na,K-ATPase ..cap alpha.. subunit. By use of site-directed mutagenesis, the amino acid sequence of the first extracellular domain (H1-H2) of the sheep ..cap alpha..1 subunit was changed to that of the rat. When expressed in HeLa cells, this mutated sheep ..cap alpha..1 construct, like the rat/sheep chimera, was able to confer ouabain resistance to these cells. Furthermore, similar results were observed when HeLa cells were transfected with a sheep ..cap alpha..1 cDNA containing only two amino acid substitutions. The resistant cells, whether transfected with the rat ..cap alpha..1 cDNA, the rat/sheep chimera, or the mutant sheep ..cap alpha..1 cDNAs, exhibited identical biochemical characteristics including ouabain-inhibitable cell growth, /sup 86/Rb/sup +/ uptake, and Na,K-ATPase activity. These results demonstrate that the presence of arginine and aspartic acid on the amino end and carboxyl end, respectively, of the H1-H2 extracellular domain of the Na,K-ATPase ..cap alpha.. subunit together is responsible for the ouabain-resistant character of the rat enzyme and the corresponding residues in the sheep ..cap alpha..1 subunit (glutamine and asparagine) are somehow involved in ouabain binding.

  1. The DFT-DVM theoretical study of the differences of quadrupole splitting and the iron electronic structure for the rough heme models for {alpha}- and {beta}-subunits in deoxyhemoglobin and for deoxymyoglobin

    Energy Technology Data Exchange (ETDEWEB)

    Yuryeva, E. I. [Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences (Russian Federation); Oshtrakh, M. I., E-mail: oshtrakh@mail.utnet.ru [Ural State Technical University-UPI, Faculty of Physical Techniques and Devices for Quality Control (Russian Federation)

    2008-01-15

    Quantum chemical calculations of the iron electron structure and {sup 57}Fe quadrupole splitting were made by density functional theory and X{alpha} discrete variation method for the rough heme models for {alpha}- and {beta}-subunits in deoxyhemoglobin and for deoxymyoglobin accounting stereochemical differences of the active sites in native proteins. The calculations revealed differences of quadrupole splitting temperature dependences for three models indicating sensitivity of quadrupole splitting and Fe(II) electronic structure to small variations of iron stereochemistry.

  2. Cloning of the Gene Encoding Urease Subunit A in Helicobacter Pylori

    Institute of Scientific and Technical Information of China (English)

    施理; 张宜俊; 陈劼; 候晓华

    2004-01-01

    Summary: The gene encoding urease subunit A (ureA) of Helicobacter pylori (H. pylori) was cloned from H. pylori isolate by polymerase chain reaction (PCR). Sterile distilled water instead of DNA served as negative control. The nucleotide sequence of the amplified product was determined.Homologous analysis of the ureA against that reported by Clayton CL and the GenBank and SwissProt databases were performed with the BLAST program at the Genome Net through the Internet.0.8 kb PCR product was amplified from all H. pylori clinical isolators. The nucleotide sequence of the ureA was determined. The nucleotide sequence of the ureA began with ATG as the initiation codon and terminated in TAA as stop codon. The coding regions had a 44 % G+ C content. The DNA sequence was 98 % homologous to that reported by Clayton CL (688 out of 702 residues were identical). The derived amino-acid sequences of the ureA were 99 % homologous to that reported by Clayton CL (232 out of 234 residues were identical). The nucleotide sequence and the predicted protein showed significant homology to ureA of H. pylori in the NCBI Entrez database.

  3. PHYLOGENY OF ANGIOSTRONGYLUS CANTONENSIS IN THAILAND BASED ON CYTOCHROME C OXIDASE SUBUNIT I GENE SEQUENCE.

    Science.gov (United States)

    Apichat, Vitta; Narongrit, Srisongcram; Jittranuch, Thiproaj; Anucha, Wongma; Wilaiwan, Polsut; Chamaiporn, Fukruksa; Thatcha, Yimthin; Bandid, Mangkit; Aunchalee, Thanwisai; Paron, Dekumyoy

    2016-05-01

    Angiostrongylus cantonensis is an emerging infectious agent causing eosinophilic meningitis or meningoencephalitis in humans with clinical manifestation of severe headache. Molecular genetic studies on classification and phylogeny of A. cantonensis in Thailand are limited. This study surveyed A. cantonensis larvae prevalence in natural intermediate hosts across Thailand and analyzed their phylogenetic relationships. A total of 14,032 freshwater and land snails were collected from 19 provinces of Thailand. None of Filopaludina sp, Pomacea sp, and Cyclophorus sp were infected with Angiostrongylus larvae, whereas Achatina fulica, Cryptozona siamensis, and Megaustenia siamensis collected from Kalasin, Kamphaeng Phet, Phetchabun, Phitsanulok, and Tak Provinces were infected, with C. siamensis being the common intermediate host. Based on morphology, larvae isolated from 11 samples of these naturally infected snails preliminarily were identified as A. cantonensis. Comparison of partial nucleotide sequences of cytochrome c oxidase subunit I gene revealed that four sequences are identical to A. cantonensis haplotype ac4 from Bangkok and the other seven to that of A. cantonensis isolate AC Thai, indicating two independent lineages of A. cantonensis in Thailand.

  4. Increase in expression level of alpha-tubulin gene in Arabidopsis seedlings under hypergravity conditions.

    Science.gov (United States)

    Saito, Yuka; Soga, Kouichi; Wakabayashi, Kazuyuki; Hoson, Takayuki

    2003-10-01

    Under hypergravity conditions, elongation growth of plant shoots is suppressed. The analysis of the changes in gene expression by hypergravity treatment in Arabidopsis hypocotyls by the differential display method showed that a gene encoding alpha-tubulin, which is a component of microtubules, was up-regulated by hypergravity. In Arabidopsis six genes encoding alpha-tubulin (TUA1-TUA6) have been identified. In the present study, we examined the dose-response and the time course relations of the changes in the expression of all six alpha-tubulin genes in Arabidopsis hypocotyls grown under hypergravity conditions. The expression levels of all six alpha-tubulin genes, TUA1-TUA6, were increased by increasing gravity, although the extent was variable among genes. The increase in expression of all alpha-tubulin genes was detected within a few hours, when the seedlings grown at 1 g were transferred to 300 g condition. These results suggest that Arabidopsis hypocotyls regulate the expression level of six alpha-tubulin genes promptly in response to gravity stimuli. The increase in the amount of microtubules due to the activation of tubulin gene expression may be involved in the regulation by gravity signal of shoot growth.

  5. Alpha tubulin genes from Leishmania braziliensis: genomic organization, gene structure and insights on their expression.

    Science.gov (United States)

    Ramírez, César A; Requena, José M; Puerta, Concepción J

    2013-07-06

    Alpha tubulin is a fundamental component of the cytoskeleton which is responsible for cell shape and is involved in cell division, ciliary and flagellar motility and intracellular transport. Alpha tubulin gene expression varies according to the morphological changes suffered by Leishmania in its life cycle. However, the objective of studying the mechanisms responsible for the differential expression has resulted to be a difficult task due to the complex genome organization of tubulin genes and to the non-conventional mechanisms of gene regulation operating in Leishmania. We started this work by analyzing the genomic organization of α-tubulin genes in the Leishmania braziliensis genome database. The genomic organization of L. braziliensis α-tubulin genes differs from that existing in the L. major and L. infantum genomes. Two loci containing α-tubulin genes were found in the chromosomes 13 and 29, even though the existence of sequence gaps does not allow knowing the exact number of genes at each locus. Southern blot assays showed that α-tubulin locus at chromosome 13 contains at least 8 gene copies, which are tandemly organized with a 2.08-kb repetition unit; the locus at chromosome 29 seems to contain a sole α-tubulin gene. In addition, it was found that L. braziliensis α-tubulin locus at chromosome 13 contains two types of α-tubulin genes differing in their 3' UTR, each one presumably containing different regulatory motifs. It was also determined that the mRNA expression levels of these genes are controlled by post-transcriptional mechanisms tightly linked to the growth temperature. Moreover, the decrease in the α-tubulin mRNA abundance observed when promastigotes were cultured at 35°C was accompanied by parasite morphology alterations, similar to that occurring during the promastigote to amastigote differentiation. Information found in the genome databases indicates that α-tubulin genes have been reorganized in a drastic manner along Leishmania

  6. Amplification of TLO Mediator Subunit Genes Facilitate Filamentous Growth in Candida Spp.

    Science.gov (United States)

    Liu, Zhongle; Moran, Gary P.; Myers, Lawrence C.

    2016-01-01

    Filamentous growth is a hallmark of C. albicans pathogenicity compared to less-virulent ascomycetes. A multitude of transcription factors regulate filamentous growth in response to specific environmental cues. Our work, however, suggests the evolutionary history of C. albicans that resulted in its filamentous growth plasticity may be tied to a change in the general transcription machinery rather than transcription factors and their specific targets. A key genomic difference between C. albicans and its less-virulent relatives, including its closest relative C. dubliniensis, is the unique expansion of the TLO (TeLOmere-associated) gene family in C. albicans. Individual Tlo proteins are fungal-specific subunits of Mediator, a large multi-subunit eukaryotic transcriptional co-activator complex. This amplification results in a large pool of ‘free,’ non-Mediator associated, Tlo protein present in C. albicans, but not in C. dubliniensis or other ascomycetes with attenuated virulence. We show that engineering a large ‘free’ pool of the C. dubliniensis Tlo2 (CdTlo2) protein in C. dubliniensis, through overexpression, results in a number of filamentation phenotypes typically associated only with C. albicans. The amplitude of these phenotypes is proportional to the amount of overexpressed CdTlo2 protein. Overexpression of other C. dubliniensis and C. albicans Tlo proteins do result in these phenotypes. Tlo proteins and their orthologs contain a Mediator interaction domain, and a potent transcriptional activation domain. Nuclear localization of the CdTlo2 activation domain, facilitated naturally by the Tlo Mediator binding domain or artificially through an appended nuclear localization signal, is sufficient for the CdTlo2 overexpression phenotypes. A C. albicans med3 null mutant causes multiple defects including the inability to localize Tlo proteins to the nucleus and reduced virulence in a murine systemic infection model. Our data supports a model in which the

  7. Sequential mutations in the interleukin-3 (IL3)/granulocyte-macrophage colony-stimulating factor/IL5 receptor beta-subunit genes are necessary for the complete conversion to growth autonomy mediated by a truncated beta C subunit.

    Science.gov (United States)

    Hannemann, J; Hara, T; Kawai, M; Miyajima, A; Ostertag, W; Stocking, C

    1995-05-01

    An amino-terminally truncated beta C receptor (beta C-R) subunit of the interleukin-3 (IL3)/granulocyte-macrophage colony-stimulating factor/IL5 receptor complex mediates factor-independent and tumorigenic growth in two spontaneous mutants of a promyelocytic cell line. The constitutive activation of the JAK2 protein kinase in these mutants confirms that signaling occurs through the truncated receptor protein. Noteworthily, in addition to a 10-kb deletion in the beta C-R subunit gene encoding the truncated receptor, several secondary and independent mutations that result in the deletion or functional inactivation of the allelic beta C-R subunit and the closely related beta IL3-R subunit genes were observed in both mutants, suggesting that such mutations are necessary for the full oncogenic penetrance of the truncated beta C-R subunit. Reversion of these mutations by the expression of the wild-type beta C-R in the two mutants resulted in a fivefold decrease in cloning efficiency of the mutants in the absence of IL3, confirming a functional interaction between the wild-type and truncated proteins. Furthermore, expression of the truncated beta C-R subunit in factor-dependent myeloid cells did not immediately render the cells autonomous but increased the spontaneous frequency to factor-independent growth by 4 orders of magnitude. Implications for both leukemogenic progression and receptor-subunit interaction and signaling are discussed.

  8. Single base mutation in the pro. alpha. 2(I) collagen gene that causes efficient splicing of RNA from exon 27 to exon 29 and synthesis of a shortened but in-frame pro. alpha. 2(I) chain

    Energy Technology Data Exchange (ETDEWEB)

    Tromp, G.; Prockop, D.J. (Thomas Jefferson Univ., Philadelphia, PA (USA))

    1988-07-01

    Previous observations demonstrated that a lethal variant of osteogenesis imperfecta had two altered alleles for pro{alpha}2(I) chains of type I procollagen. One mutation produced a nonfunctioning allele in that there was synthesis of mRNA but no detectable synthesis of pro{alpha}2(I) chains from the allele. The mutation in the other allele caused synthesis of shortened pro{alpha}2(I) chains that lacked most or all of the 18 amino acids encoded by exon 28. Subclones of the pro{alpha}2(I) gene were prepared from the proband's DNA and the DNA sequence was determined for a 582-base-pair (bp) region that extended from the last 30 bp of intervening sequence 26 to the first 26 bp of intervening sequence 29. Data from six independent subclones demonstrated that all had the same sequence as a previously isolated normal clone for the pro{alpha}2(I) gene except that four subclones had a single base mutation at the 3{prime} end of intervening sequence 27. The mutation was a substitution of guanine for adenine that changed the universal consensus sequence for the 3{prime} splicing site of RNA from -AG- to -GG-. S1 nuclease experiments demonstrated that about half the pro{alpha}2(I) mRNA in the proband's fibroblasts was abnormally spliced and that the major species of abnormal pro{alpha}2(I) mRNA was completely spliced from the last codon of exon 27 to the first codon of exon 29. The mutation is apparently unique among RNA splicing mutations of mammalian systems in producing a shortened polypeptide chain that is in-frame in terms of coding sequences, that is used in the subunit assembly of a protein, and that contributes to a lethal phenotype.

  9. Hb Bronte or alpha93(FG5)Val-->Gly: a new unstable variant of the alpha2-globin gene, associated with a mild alpha(+)-thalassemia phenotype.

    Science.gov (United States)

    Lacerra, Giuseppina; Testa, Rosario; De Angioletti, Maria; Schilirò, Gino; Carestia, Clementina

    2003-08-01

    We report a new unstable variant identified in three carriers of a family from East Sicily; it was named Hb Bronte after the place from which the family originated. DNA sequencing from nucleotides -181 to +894 (alpha1) and to +884 (alpha2) revealed a GTG-->GGG substitution at codon 93 of the alpha2-globin gene. The MCV and MCH values were at the lower end of the normal range in the carriers. On cation exchange high performance liquid chromatography (HPLC), the Hb A2 level was apparently increased to around 6%, and a small abnormal peak (0.3-0.4%) was detected after Hb A2. Two abnormal bands were detected by cellulose acetate electrophoresis: a major band (about 3-4%) migrated between Hb A and Hb F; a minor band (<1%) migrated between Hb A2 and carbonic anhydrase. Normal values of Hb A2 were detected by DEAE microchromatography. On reversed phase HPLC the variant chain was not detected, and most likely it was eluted with the alpha chain peak. The isopropanol stability test was very slightly positive in the carriers. Hemolytic symptoms were absent with the exception of indirect bilirubin, which was at high borderline in 2/3 carriers. In biosynthesis in vitro, the specific activity of the alpha chains was much higher than that of the beta-globin chains, and the alpha/beta biosynthetic ratio in the mother and proband was of the beta-thalassemia (thal) type (2.24 and 2.54, respectively). Time course experiments showed that the increase of the 3H-specific activity of the peak containing normal and variant alpha chains was not linear and was much higher than that of beta chains; moreover, the alpha/beta biosynthetic ratio varied during the 2 hours incubation.

  10. Constitutive Activation of the G-Protein Subunit G[alpha]s within Forebrain Neurons Causes PKA-Dependent Alterations in Fear Conditioning and Cortical "Arc" mRNA Expression

    Science.gov (United States)

    Kelly, Michele P.; Cheung, York-Fong; Favilla, Christopher; Siegel, Steven J.; Kanes, Stephen J.; Houslay, Miles D.; Abel, Ted

    2008-01-01

    Memory formation requires cAMP signaling; thus, this cascade has been of great interest in the search for cognitive enhancers. Given that medications are administered long-term, we determined the effects of chronically increasing cAMP synthesis in the brain by expressing a constitutively active isoform of the G-protein subunit G[alpha]s…

  11. Zolpidem, a selective GABA(A) receptor alpha1 subunit agonist, induces comparable Fos expression in oxytocinergic neurons of the hypothalamic paraventricular and accessory but not supraoptic nuclei in the rat

    DEFF Research Database (Denmark)

    Kiss, Alexander; Søderman, Andreas; Bundzikova, Jana;

    2006-01-01

    Functional activation of oxytocinergic (OXY) cells in the hypothalamic paraventricular (PVN), supraoptic (SON), and accessory (ACC) nuclei was investigated in response to acute treatment with Zolpidem (a GABA(A) receptor agonist with selectivity for alpha(1) subunits) utilizing dual Fos/OXY immun...

  12. Zolpidem, a selective GABA(A) receptor alpha1 subunit agonist, induces comparable Fos expression in oxytocinergic neurons of the hypothalamic paraventricular and accessory but not supraoptic nuclei in the rat

    DEFF Research Database (Denmark)

    Kiss, Alexander; Søderman, Andreas; Bundzikova, Jana

    2006-01-01

    Functional activation of oxytocinergic (OXY) cells in the hypothalamic paraventricular (PVN), supraoptic (SON), and accessory (ACC) nuclei was investigated in response to acute treatment with Zolpidem (a GABA(A) receptor agonist with selectivity for alpha(1) subunits) utilizing dual Fos/OXY immun...

  13. Identification of Interleukin-27 (IL-27)/IL-27 Receptor Subunit Alpha as a Critical Immune Axis for In Vivo HIV Control.

    Science.gov (United States)

    Ruiz-Riol, M; Berdnik, D; Llano, A; Mothe, B; Gálvez, C; Pérez-Álvarez, S; Oriol-Tordera, B; Olvera, A; Silva-Arrieta, S; Meulbroek, M; Pujol, F; Coll, J; Martinez-Picado, J; Ganoza, C; Sanchez, J; Gómez, G; Wyss-Coray, T; Brander, C

    2017-08-15

    blood is a key conduit for transporting such factors. Investigating the communication factors promoting effective immune responses and having potentially antiviral functions against HIV using a novel focused omics approach ("communicome") has the potential to significantly improve our knowledge of effective host immunity and accelerate the HIV cure agenda. Including 140 subjects with variable viral loads and measuring the plasma levels of >600 soluble proteins, our data highlight the importance of Th17 cells and Wnt/β-catenin signaling in HIV control and especially identify the IL-27/IL-27 receptor subunit alpha (IL-27RA) axis as a predictor of plasma viral load and proviral copy number in the peripheral blood. These data may provide important guidance to therapeutic approaches in the HIV cure agenda. Copyright © 2017 Ruiz-Riol et al.

  14. Structure and expression analysis of genes encoding ADP-glucose pyrophosphorylase large subunit in wheat and its relatives.

    Science.gov (United States)

    Zhang, Xiao-Wei; Li, Si-Yu; Zhang, Ling-Ling; Yang, Qiang; Jiang, Qian-Tao; Ma, Jian; Qi, Peng-Fei; Li, Wei; Chen, Guo-Yue; Lan, Xiu-Jin; Deng, Mei; Lu, Zhen-Xiang; Liu, Chunji; Wei, Yu-Ming; Zheng, You-Liang

    2016-07-01

    ADP-glucose pyrophosphorylase (AGP), which consists of two large subunits (AGP-L) and two small subunits (AGP-S), controls the rate-limiting step in the starch biosynthetic pathway. In this study, a full-length open reading frame (ORF) of AGP-L gene (named as Agp2) in wheat and a series of Agp2 gene sequences in wheat relatives were isolated. The coding region of Agp2 contained 15 exons and 14 introns including a full-length ORF of 1566 nucleotides, and the deduced protein contained 522 amino acids (57.8 kDa). Generally, the phylogenetic tree of Agp2 indicated that sequences from A- and D-genome donor species were most similar to each other and sequences from B-genome donor species contained more variation. Starch accumulation and Agp2 expression in wheat grains reached their peak at 21 and 15 days post anthesis (DPA), respectively.

  15. Expression pattern of the RAR alpha-PML fusion gene in acute promyelocytic leukemia.

    Science.gov (United States)

    Alcalay, M; Zangrilli, D; Fagioli, M; Pandolfi, P P; Mencarelli, A; Lo Coco, F; Biondi, A; Grignani, F; Pelicci, P G

    1992-01-01

    Two chimeric genes, PML-RAR alpha and RAR alpha-PML, are formed as a consequence of the acute promyelocytic leukemia (APL)-specific reciprocal translocation of chromosomes 15 and 17 [t(15;17)]. PML-RAR alpha is expressed as a fusion protein. We investigated the organization and expression pattern of the RAR alpha-PML gene in a series of APL patients representative of the molecular heterogeneity of the t(15;17) and found (i) two types of RAR alpha-PML mRNA junctions (RAR alpha exon 2/PML exon 4 or RAR alpha exon 2/PML exon 7) that maintain the RAR alpha and PML longest open reading frames aligned and are the result of chromosome 15 breaking at two different sites; and (ii) 10 different RAR alpha-PML fusion transcripts that differ for the assembly of their PML coding exons. A RAR alpha-PML transcript was present in most, but not all, APL patients. Images PMID:1317574

  16. Evolution, expression differentiation and interaction specificity of heterotrimeric G-protein subunit gene family in the mesohexaploid Brassica rapa.

    Directory of Open Access Journals (Sweden)

    Gulab C Arya

    Full Text Available Heterotrimeric G-proteins, comprising of Gα, Gβ, and Gγ subunits, are important signal transducers which regulate many aspects of fundamental growth and developmental processes in all eukaryotes. Initial studies in model plants Arabidopsis and rice suggest that the repertoire of plant G-protein is much simpler than that observed in metazoans. In order to assess the consequence of whole genome triplication events within Brassicaceae family, we investigated the multiplicity of G-protein subunit genes in mesohexaploid Brassica rapa, a globally important vegetable and oilseed crop. We identified one Gα (BraA.Gα1, three Gβ (BraA.Gβ1, BraA.Gβ2, and BraA.Gβ3, and five Gγ (BraA.Gγ1, BraA.Gγ2, BraA.Gγ3, BraA.Gγ4, and BraA.Gγ5 genes from B. rapa, with a possibility of 15 Gαβγ heterotrimer combinations. Our analysis suggested that the process of genome triplication coupled with gene-loss (gene-fractionation phenomenon have shaped the quantitative and sequence diversity of G-protein subunit genes in the extant B. rapa genome. Detailed expression analysis using qRT-PCR assays revealed that the G-protein genes have retained ubiquitous but distinct expression profiles across plant development. The expression of multiple G-protein genes was differentially regulated during seed-maturation and germination stages, and in response to various phytohormone treatments and stress conditions. Yeast-based interaction analysis showed that G-protein subunits interacted in most of the possible combinations, with some degree of subunit-specific interaction specificity, to control the functional selectivity of G-protein heterotrimer in different cell and tissue-types or in response to different environmental conditions. Taken together, this research identifies a highly diverse G-protein signaling network known to date from B. rapa, and provides a clue about the possible complexity of G-protein signaling networks present across globally important Brassica

  17. Transcription factors interacting with herpes simplex virus alpha gene promoters in sensory neurons.

    Science.gov (United States)

    Hagmann, M; Georgiev, O; Schaffner, W; Douville, P

    1995-01-01

    Interference with VP16-mediated activation of herpes virus immediate-early (or alpha) genes is thought to be the major cause of establishing viral latency in sensory neurons. This could be brought about by lack of a key activating transcription factor(s) or active repression. In this study we find that sensory neurons express all important components for VP16-mediated alpha gene induction, such as the POU transcription factor Oct-1, host cell factor (HCF) and GABP alpha/beta. However, Oct-1 and GABP alpha/beta are only present at low levels and the VP16-induced complex (VIC) appears different. We do not find protein expression of the transcription factor Oct-2, implicated by others as an alpha gene repressor. The POU factor N-Oct3 (Brn 2 or POU3F2) is also present in sensory neurons and binds viral TAATGARAT motifs with higher affinity than Oct-1, indicating that it may be a candidate repressor for competitive binding to TAATGARAT motifs. When transfected into HeLa cells, where Oct-1 and GABP alpha/beta are highly abundant, N-Oct3 represses model promoters with multimerized TAATGARAT motifs, but fails to repress complete alpha gene promoters. Taken together our findings suggest that modulation of alpha gene promoters could contribute to viral latency when low concentrations of the activating transcription factors Oct-1 and GABP alpha/beta prevail. Our data, however, refute the notion that competing Oct factors are able to block alpha gene transcription to achieve viral latency. Images PMID:8559654

  18. Alpha-defensin DEFA1A3 gene copy number elevation in Danish Crohn's disease patients

    DEFF Research Database (Denmark)

    Jespersgaard, Cathrine; Fode, Peder; Dybdahl, Marianne

    2011-01-01

    BACKGROUND AND PURPOSE OF STUDY: Extensive copy number variation is observed for the DEFA1A3 gene encoding alpha-defensins 1-3. The objective of this study was to determine the involvement of alpha-defensins in colonic tissue from Crohn's disease (CD) patients and the possible genetic association...

  19. Hemoglobin alpha 2 gene +861 G>A polymorphism in Turkish ...

    African Journals Online (AJOL)

    Dilay Ciglidag Dungul

    Abstract Thalassemia is an inherited blood disorder which is divided into two groups: alpha and beta. HBA1 and HBA2 are the two genes associated with alpha thalassemia. The aim of this ... that affects a patient's ability to produce hemoglobin, resulting ..... interaction of a deletional o-thalassemia-1 and a newly discovered.

  20. Cloning and expression in Escherichia coli of a new gene of Schistosoma japonicum encoding casein kinase Ⅱ beta subunit

    Institute of Scientific and Technical Information of China (English)

    彭寨玉; 余新炳; 吴忠道; 徐劲; 吴德; 李孜

    2004-01-01

    Background Nowadays it is now a focus topic in schistosomiasis research to find ideal vaccine candidates and new drug targets for developing anti-schistosomiasis vaccine. We cloned a new gene, casein kinase Ⅱ beta subunit, of Schistosoma japonicum (S. japonicum) and express it in Escherichia coli (E.coli).Methods The ESTs obtained in our laboratory were analyzed by homologous searching, and a new gene was recognized. The full-length cDNA of the new gene was obtained by joining the 3'RACE PCR fragment and the EST clone. To express the new gene, the cDNA was cloned into pGEX-4T-1 vector and then transformed into E.coli JM109. The recombinant protein was analyzed by SDS-PAGE and Western-blot. Results A 908 bp cDNA was isolated from S. japonicum and identified to be casein kinase Ⅱ beta subunit gene by sequence analysis. The open reading frame of the gene encodes a protein of 217 amino acids exhibiting 75.8%, 75.8%, 73.9%, 68.2%, 51.6% identity to the amino acids sequence of the corresponding genes of Homo sapiens (H. sapiens), Xenopus laevi (X. laevi), Drosophila melanogaster (D. melanogaster), Caenorhabditis elegan (C. elegan), and Schizosaccharomyces pombe (S. promber) respectively. The predicted molecular weight of the protein was 24.921 kDa. The new cDNA sequence had been submitted to GenBank, and its accession number is AY241391. This cDNA was subcloned into the pGEX-4T-1 vector and expressed in E.coli JM109.The recombinant protein could be recognized by the S. japonicum infected rabbit serum. Conclusion The full-length cDNA sequences encoding S. japonicum casein kinase Ⅱ beta subunit were firstly sequenced, cloned, and expressed in E.coli.

  1. The epithelial sodium channel γ-subunit gene and blood pressure: family based association, renal gene expression, and physiological analyses.

    Science.gov (United States)

    Büsst, Cara J; Bloomer, Lisa D S; Scurrah, Katrina J; Ellis, Justine A; Barnes, Timothy A; Charchar, Fadi J; Braund, Peter; Hopkins, Paul N; Samani, Nilesh J; Hunt, Steven C; Tomaszewski, Maciej; Harrap, Stephen B

    2011-12-01

    Variants in the gene encoding the γ-subunit of the epithelial sodium channel (SCNN1G) are associated with both Mendelian and quantitative effects on blood pressure. Here, in 4 cohorts of 1611 white European families composed of a total of 8199 individuals, we undertook staged testing of candidate single-nucleotide polymorphisms for SCNN1G (supplemented with imputation based on data from the 1000 Genomes Project) followed by a meta-analysis in all of the families of the strongest candidate. We also examined relationships between the genotypes and relevant intermediate renal phenotypes, as well as expression of SCNN1G in human kidneys. We found that an intronic single-nucleotide polymorphism of SCNN1G (rs13331086) was significantly associated with age-, sex-, and body mass index-adjusted blood pressure in each of the 4 populations (Ppressure and 0.52-mm Hg increase in diastolic blood pressure (SE=0.33, P=0.002 for systolic blood pressure; SE=0.21, P=0.011 for diastolic blood pressure). The same allele was also associated with higher 12-hour overnight urinary potassium excretion (P=0.04), consistent with increased epithelial sodium channel activity. Renal samples from hypertensive subjects showed a nonsignificant (P=0.07) 1.7-fold higher expression of SCNN1G compared with normotensive controls. These data provide genetic and phenotypic evidence in support of a role for a common genetic variant of SCNN1G in blood pressure determination.

  2. Rational design of glycerol dehydratase: Swapping the genes encoding the subunits of glycerol dehydratase to improve enzymatic properties

    Institute of Scientific and Technical Information of China (English)

    QI Xianghui; SUN Liang; LUO Zhaofei; WU Jiequn; MENG Xiaolei; TANG Yue; WEI Yutuo; HUANG Ribo

    2006-01-01

    1,3-propanediol (1,3-PD) is an important material for chemical industry, and there has been always much interest in the production of 1,3-PD using all possible routes. The genes encoding glycerol dehydratase (GDHt) from Citrobacter freundii,Klebsiella pneumoniae and metagenome were cloned and expressed in E. coli. All glycerol dehydratases but the one from metagenome could be detected to show enzyme activities. In order to improve the enzymatic properties of GDHts, the genes encoding α and β-γ subunits were cloned, and the enzyme characteristics were evolved by rational design based on their 3D structures which were constructed by homology modeling. Six heteroenzymes were obtained by swapping the α subunit genes of these three different-source-derived GDHts. The pH,thermal stability and Vmax of some heteroenzymes were dramatically improved by 2-5 times compared with the wild one (GDHtKP). The GDHt cloned from metagenome, originally proved to be with no enzyme activity, was converted into active enzyme by swapping its subunits with other different GDHts. In addition, the effect of subtle 3D structural changes on the properties of the enzyme was also observed.

  3. Genetic interaction of an origin recognition complex subunit and the Polycomb group gene MEDEA during seed development.

    Science.gov (United States)

    Collinge, Margaret A; Spillane, Charles; Köhler, Claudia; Gheyselinck, Jacqueline; Grossniklaus, Ueli

    2004-04-01

    The eukaryotic origin recognition complex (ORC) is made up of six subunits and functions in nuclear DNA replication, chromatin structure, and gene silencing in both fungi and metazoans. We demonstrate that disruption of a plant ORC subunit homolog, AtORC2 of Arabidopsis (Arabidopsis thaliana), causes a zygotic lethal mutant phenotype (orc2). Seeds of orc2 abort early, typically producing embryos with up to eight cells. Nuclear division in the endosperm is arrested at an earlier developmental stage: only approximately four nuclei are detected in orc2 endosperm. The endosperm nuclei in orc2 are dramatically enlarged, a phenotype that is most similar to class B titan mutants, which include mutants in structural maintenance of chromosomes (SMC) cohesins. The highest levels of ORC2 gene expression were found in preglobular embryos, coinciding with the stage at which homozygous orc2 mutant seeds arrest. The homologs of the other five Arabidopsis ORC subunits are also expressed at this developmental stage. The orc2 mutant phenotype is partly suppressed by a mutation in the Polycomb group gene MEDEA. In double mutants between orc2 and medea (mea), orc2 homozygotes arrest later with a phenotype intermediate between those of mea and orc2 single mutants. Either alterations in chromatin structure or the release of cell cycle checkpoints by the mea mutation may allow more cell and nuclear divisions to occur in orc2 homozygous seeds.

  4. Differential regulation of alpha7 nicotinic receptor gene (CHRNA7) expression in schizophrenic smokers.

    Science.gov (United States)

    Mexal, Sharon; Berger, Ralph; Logel, Judy; Ross, Randal G; Freedman, Robert; Leonard, Sherry

    2010-01-01

    The alpha7 neuronal nicotinic receptor gene (CHRNA7) has been implicated in the pathophysiology of schizophrenia by genetic and pharmacological studies. Expression of the alpha7* receptor, as measured by [(125)I]alpha-bungarotoxin autoradiography, is decreased in postmortem brain of schizophrenic subjects compared to non-mentally ill controls. Most schizophrenic patients are heavy smokers, with high levels of serum cotinine. Smoking changes the expression of multiple genes and differentially regulates gene expression in schizophrenic hippocampus. We examined the effects of smoking on CHRNA7 expression in the same tissue and find that smoking differentially regulates expression of both mRNA and protein for this gene. CHRNA7 mRNA and protein levels are significantly lower in schizophrenic nonsmokers compared to control nonsmokers and are brought to control levels in schizophrenic smokers. Sufficient protein but low surface expression of the alpha7* receptor, seen in the autoradiographic studies, suggests aberrant assembly or trafficking of the receptor.

  5. The carB Gene Encoding the Large Subunit of Carbamoylphosphate Synthetase from Lactococcus lactis Is Transcribed Monocistronically

    Science.gov (United States)

    Martinussen, Jan; Hammer, Karin

    1998-01-01

    The biosynthesis of carbamoylphosphate is catalyzed by the heterodimeric enzyme carbamoylphosphate synthetase. The genes encoding the two subunits of this enzyme in procaryotes are normally transcribed as an operon, but the gene encoding the large subunit (carB) in Lactococcus lactis is shown to be transcribed as an isolated unit. Carbamoylphosphate is a precursor in the biosynthesis of both pyrimidine nucleotides and arginine. By mutant analysis, L. lactis is shown to possess only one carB gene; the same gene product is thus required for both biosynthetic pathways. Furthermore, arginine may satisfy the requirement for carbamoylphosphate in pyrimidine biosynthesis through degradation by means of the arginine deiminase pathway. The expression of the carB gene is subject to regulation at the level of transcription by pyrimidines, most probably by an attenuator mechanism. Upstream of the carB gene, an open reading frame showing a high degree of similarity to those of glutathione peroxidases from other organisms was identified. PMID:9721272

  6. Prodynorphin gene deletion increased anxiety-like behaviours, impaired the anxiolytic effect of bromazepam and altered GABAA receptor subunits gene expression in the amygdala.

    Science.gov (United States)

    Femenía, Teresa; Pérez-Rial, Sandra; Urigüen, Leyre; Manzanares, Jorge

    2011-01-01

    This study evaluated the role of prodynorphin gene in the regulation of anxiety and associated molecular mechanisms. Emotional responses were assessed using the light-dark test, elevated plus maze and social interaction tests in prodynorphin knockout and wild-type mice. Corticotrophin releasing factor and proopiomelanocortin gene expressions in the hypothalamus were evaluated after restraint stress using in situ hybridization. The anxiolytic efficacy of bromazepam and GABA(A) receptor subunits gene expression in the amygdala were also assessed in both genotypes. The deletion of prodynorphin increased anxiety-like behaviours and proopiomelanocortin gene expression in the arcuate nucleus (two-fold). Moreover, the anxiolytic action of bromazepam was significantly attenuated in the mutant mice. Decreased GABA(A)γ(2) and increased GABA(A)β(2) gene expression receptor subunits were found in the amygdala of prodynorphin knockout mice. These results indicate that deletion of prodynorphin gene is associated with increased anxiety-like behaviours, enhanced sensibility response to stress stimuli, reduced anxiolytic efficacy of bromazepam and altered expression of the GABA(A) receptor subunits.

  7. The catalytic subunit of cAMP-dependent protein kinase induces expression of genes containing cAMP-responsive enhancer elements.

    Science.gov (United States)

    Riabowol, K T; Fink, J S; Gilman, M Z; Walsh, D A; Goodman, R H; Feramisco, J R

    1988-11-03

    Transcriptional regulation of eukaryotic genes by cyclic AMP requires a cAMP-dependent protein kinase (A kinase). Two hypotheses have been proposed to explain how the holoenzyme of the A kinase induces transcription. The regulatory subunits of the A kinase, which bind cAMP and DNA, and have amino-acid homology with the Escherichia coli catabolite activator protein could directly stimulate gene expression. Alternatively, phosphorylation by the catalytic subunits could induce transcription by activating proteins involved in gene transcription. To distinguish between these models, we microinjected purified preparations of the catalytic and regulatory subunits of A kinase into tissue culture cells and monitored expression of a stably integrated fusion gene containing a cAMP-responsive human promoter fused to a bacterial reporter gene, or of the endogenous c-fos gene. The catalytic subunit stimulated expression of these genes, whereas the regulatory subunit did not. These results indicate that the catalytic subunit of A kinase is sufficient to induce expression of two cAMP-responsive genes, without increasing levels of cAMP.

  8. Transgene inheritance and quality improvement by expressing novel HMW glutenin subunit (HMW-GS) genes in winter wheat

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    The expression vector pBPC30, which carries the high molecular weight glutenin subunit (HMW-GS) 1Dx5 and 1Dy10 genes, was transferred into hexaploid winter wheat cv. Jinghua No. 1, Jing411 and Jingdong No. 6 explants of immature embryos and immature inflorescence by particle bombardment. A large number of resistant transgenic plants were obtained under the selection of herbicide bialaphos or phosphinothricin (PPT). Confirmed transgenic plants of T0 generation showed successful integration of HMW-GS genes and bar gene into the wheat genome. T1 generation of transgenic plants can resist 20-150 mg/L PPT. Protein analysis of T2 seed by SDS-PAGE showed that HMW-GS 1Dx5 and 1Dy10 genes were well expressed in offspring seed of transgenic lines by co-expression with or substitution of endogenous 1Dx2 or 1Dy10. In one transgenic line, TG3-74, a new protein band between endogenous protein subunits 7 and 8 (marked as 8*) of glutenin appeared, but endogenous subunit 8 (encoded by 1By8 gene) was absent. Analysis of gluten rheological quality on seed proteins of 102 T3 plants showed that the sedimentation value of 5 transgenic lines (44.2-49.0 mL) was remarkably improved, 59.6%-64.3% higher than that of wild type Jinghua No. 1 and Jingdong No. 6, similar to bread wheat Cheyenne (48.0 mL). Analysis of dough rheological properties of transgenic lines showed that the dough stable time of 5 transgenic lines range from 16 to 30 min, whereas the dough stable time of wild type was only between 3-7 min. Our research suggests that introducing novel HMW-GS genes into wheat is an efficient way to improve its bread-making quality.

  9. Cloning and comparative analysis of gene structure in promoter site of alpha-s1 casein gene in Naeinian goat and sheep

    Directory of Open Access Journals (Sweden)

    Mojtaba Najafi

    2014-12-01

    Full Text Available The 5′ end or alpha-S1 casein promoter has a significant role in milk protein gene expression. The understanding of the translation process of alpha-S1 casein mutants will provide us an opportunity to make the best selection in livestock providing more proteins in milk. Blood samples were taken from three hundred of Naeinian goats and sheep, and DNA extraction was done using modified salting out method. Polymerase chain reactions (PCR were carried out using a specific primer pairs for amplification a fragment of 1133 bp from part of 5′-UTR and exon 1 of alpha s1 casein gene. The AluI and HinfI restriction enzyme treatment of all samples provided the same homozygous AA genotype in both species. Subsequently, one sample of each species was selected and cloned, and the final sequences were analyzed by BioEdit, CLC genomic, Mega4 and DNASIS MAX software. Several polymorphisms are recognized between Naeinian goat and sheep that are presented on motif sites. In this research, the interested location, including exon I and a part of 5′, was analyzed, and genetic element comparisons were done between Naeinian goat and sheep. The number and location of probable binding sites can have a crucial role as a result of antagonistic and synergistic effects on gene regulation activities.

  10. Identification of the T-cell receptor alpha variable (TRAV) gene(s) in T-cell malignancies.

    Science.gov (United States)

    Hinz, T; Kabelitz, D

    2000-12-01

    Due to the lack of a complete range of monoclonal antibodies (mAb) it is often impossible to rapidly identify by flow cytometry the T-cell receptor variable genes in patients suffering from T-cell malignancies. This applies especially to the alpha variable genes (TRAV), since only very few anti-TcR variable alpha mAb are available. We describe a very rapid method for inverse PCR amplification of the TcR alpha chain without prior purification of the double-stranded cDNA, provide the sequences for appropriate oligonucleotides, and describe a buffer system that dramatically enhances the amplification efficiency as compared to standard conditions.

  11. Isolation and Sequence Analysis of HMW Glutenin Subunit 1Dy10.1 Ecoding Gene from Xinjiang Wheat (Triticum petropavlovskyi Udacz.et Migusch)

    Institute of Scientific and Technical Information of China (English)

    JIANG Qian-tao; WEI Yu-ming; WANG Ji-rui; YAN Ze-hong; ZHENG You-liang

    2006-01-01

    A novel HMW glutenin subunit gene 1Dy10.1 was isolated and characterized from Xinjiang wheat (Triticum petropavlovskyi. Udacz. et Migusch) accession Daomai 2. The complete open reading frame (ORF) of 1Dy10.1 was 1965 bp, encoding 655 amino acids. The numbers and distribution of cysteines in 1Dy10.1 were similar to those of 1Dy10 and other y-type subunits. In the N-terminal of 1Dy10.1, an amino acid was changed from L (leucine) to P (proline) at position 55. The repetitive domain of 1Dy10.1 differed from those of known HMW subunits by substitutions, insertions or/and deletions involving single or more amino acid residues. In the repetitive domain of subunit 1Dy10.1, the deletion of tripeptide GQQ in the consensus unit PGQGQQ resulted in the appearance of the motif PGQ that have not been observed in other known y-type HMW subunits. In comparison with the subunit 1Dy12, a deletion of dipeptide GQ, which occurred in subunit 1Dy10, was also observed in subunit 1Dy10.1. The cloned 1Dyl0.1 gene had been successfully expressed in Escherichia coli, and the expressed protein had the identical mobility with the endogenous subunit 1Dyl0.1 from seed.

  12. Modulation of gene expression by alpha-tocopherol and alpha-tocopheryl phosphate in thp-1 monocytes

    Science.gov (United States)

    The naturally occurring vitamin E analogue, alpha-tocopheryl phosphate (alphaTP), has been reported to be more potent than the un-phosphorylated alpha alpha-tocopherol (alphaT). We have now measured plasma levels of alphaTP and compared the cellular effects of alphaTP and gamma-tocopheryl phosphate ...

  13. Bacillus stearothermophilus contains a plasmid-borne gene for alpha-amylase.

    Science.gov (United States)

    Mielenz, J R

    1983-01-01

    The gene for thermostable alpha-amylase from the thermophilic bacterium Bacillus stearothermophilus has been cloned and expressed in Escherichia coli. Each alpha-amylase-producing colony contained at least a 9.7-kilobase-pair (kb) chimeric plasmid composed of the vector pBR322 and a common 5.4-kb HindIII fragment of DNA. B. stearothermophilus contains four plasmids with sizes from 12 kb to over 108 kb. Restriction endonuclease analysis of these naturally occurring plasmids showed they also contain a 5.4-kb HindIII fragment of DNA. Cloning experiments with the four plasmids yielded alpha-amylase-producing E. coli that contained the same 9.7-kb chimeric plasmid. Restriction endonuclease analysis and further recombinant DNA experiments identified a 26-kb plasmid that contains the gene for alpha-amylase. A spontaneous mutant of B. stearothermophilus unable to produce alpha-amylase was missing the 26-kb plasmid but contained a 20-kb plasmid. A 6-kb deletion within the region of the 5.4-kb HindIII fragment yielded the 20-kb plasmid unable to code for alpha-amylase. A nick-translated probe for the alpha-amylase coding region did not hybridize to either plasmid or total cellular DNA from this mutant strain of B. stearothermophilus. These results demonstrate the gene for alpha-amylase is located exclusively on a 26-kb plasmid in B. stearothermophilus with no genetic counterpart present on the chromosome. Images PMID:6193526

  14. K+-Phosphatase activity of gill (Na+, K+)-ATPase from the blue crab, Callinectes danae: low-salinity acclimation and expression of the alpha-subunit.

    Science.gov (United States)

    Masui, D C; Furriel, R P M; Mantelatto, F L M; McNamara, J C; Leone, F A

    2005-04-01

    The kinetic properties of a microsomal gill (Na(+), K(+)) ATPase from the blue crab, Callinectes danae, acclimated to 15 per thousand salinity for 10 days, were analyzed using the substrate p-nitrophenylphosphate. The (Na(+), K(+))-ATPase hydrolyzed the substrate obeying Michaelian kinetics at a rate of V=102.9+/-4.3 U.mg(-1) with K(0.5)=1.7+/-0.1 mmol.L(-1), while stimulation by magnesium (V=93.7+/-2.3 U.mg(-1); K(0.5)=1.40+/-0.03 mmol.L(-1)) and potassium ions (V=94.9+/-3.5 U.mg(-1); K(0.5)=2.9+/-0.1 mmol.L(-1)) was cooperative. K(+)-phosphatase activity was also stimulated by ammonium ions to a rate of V=106.2+/-2.2 U. mg(-1) with K(0.5)=9.8+/-0.2 mmol.L(-1), following cooperative kinetics (n(H)=2.9). However, K(+)-phosphatase activity was not stimulated further by K(+) plus NH(4) (+) ions. Sodium ions (K(I)=22.7+/-1.7 mmol.L(-1)), and orthovanadate (K(I)=28.1+/-1.4 nmol.L(-1)) completely inhibited PNPPase activity while ouabain inhibition reached almost 75% (K(I)=142.0+/-7.1 micromol.L(-1)). Western blotting analysis revealed increased expression of the (Na(+), K(+))-ATPase alpha-subunit in crabs acclimated to 15 per thousand salinity compared to those acclimated to 33 per thousand salinity. The increase in (Na(+), K(+))-ATPase activity in C. danae gill tissue in response to low-salinity acclimation apparently derives from the increased expression of the (Na(+), K( (+) ))-ATPase alpha-subunit; phosphate-hydrolyzing enzymes other than (Na(+), K(+))-ATPase are also expressed. These findings allow a better understanding of the kinetic behavior of the enzymes that underlie the osmoregulatory mechanisms of euryhaline crustaceans. (c) 2005 Wiley-Liss, Inc.

  15. Interspecies variation reveals a conserved repressor of alpha-specific genes in Saccharomyces yeasts.

    Science.gov (United States)

    Zill, Oliver A; Rine, Jasper

    2008-06-15

    The mating-type determination circuit in Saccharomyces yeast serves as a classic paradigm for the genetic control of cell type in all eukaryotes. Using comparative genetics, we discovered a central and conserved, yet previously undetected, component of this genetic circuit: active repression of alpha-specific genes in a cells. Upon inactivation of the SUM1 gene in Saccharomyces bayanus, a close relative of Saccharomyces cerevisiae, a cells acquired mating characteristics of alpha cells and displayed autocrine activation of their mating response pathway. Sum1 protein bound to the promoters of alpha-specific genes, repressing their transcription. In contrast to the standard model, alpha1 was important but not required for alpha-specific gene activation and mating of alpha cells in the absence of Sum1. Neither Sum1 protein expression, nor its association with target promoters was mating-type-regulated. Thus, the alpha1/Mcm1 coactivators did not overcome repression by occluding Sum1 binding to DNA. Surprisingly, the mating-type regulatory function of Sum1 was conserved in S. cerevisiae. We suggest that a comprehensive understanding of some genetic pathways may be best attained through the expanded phenotypic space provided by study of those pathways in multiple related organisms.

  16. Ribosomal protein S3: a KH domain subunit in NF-kappaB complexes that mediates selective gene regulation.

    Science.gov (United States)

    Wan, Fengyi; Anderson, D Eric; Barnitz, Robert A; Snow, Andrew; Bidere, Nicolas; Zheng, Lixin; Hegde, Vijay; Lam, Lloyd T; Staudt, Louis M; Levens, David; Deutsch, Walter A; Lenardo, Michael J

    2007-11-30

    NF-kappaB is a DNA-binding protein complex that transduces a variety of activating signals from the cytoplasm to specific sets of target genes. To understand the preferential recruitment of NF-kappaB to specific gene regulatory sites, we used NF-kappaB p65 in a tandem affinity purification and mass spectrometry proteomic screen. We identified ribosomal protein S3 (RPS3), a KH domain protein, as a non-Rel subunit of p65 homodimer and p65-p50 heterodimer DNA-binding complexes that synergistically enhances DNA binding. RPS3 knockdown impaired NF-kappaB-mediated transcription of selected p65 target genes but not nuclear shuttling or global protein translation. Rather, lymphocyte-activating stimuli caused nuclear translocation of RPS3, parallel to p65, to form part of NF-kappaB bound to specific regulatory sites in chromatin. Thus, RPS3 is an essential but previously unknown subunit of NF-kappaB involved in the regulation of key genes in rapid cellular activation responses. Our observations provide insight into how NF-kappaB selectively controls gene expression.

  17. Switch in glutamate receptor subunit gene expression in CA1 subfield of hippocampus following global ischemia in rats.

    Science.gov (United States)

    Pellegrini-Giampietro, D E; Zukin, R S; Bennett, M V; Cho, S; Pulsinelli, W A

    1992-11-01

    Severe, transient global ischemia of the brain induces delayed damage to specific neuronal populations. Sustained Ca2+ influx through glutamate receptor channels is thought to play a critical role in postischemic cell death. Although most kainate-type glutamate receptors are Ca(2+)-impermeable, Ca(2+)-permeable kainate receptors have been reported in specific kinds of neurons and glia. Recombinant receptors assembled from GluR1 and/or GluR3 subunits in exogenous expression systems are permeable to Ca2+; heteromeric channels containing GluR2 subunits are Ca(2+)-impermeable. Thus, altered expression of GluR2 in development or following a neurological insult or injury to the brain can act as a switch to modify Ca2+ permeability. To investigate the molecular mechanism underlying delayed postischemic cell death, GluR1, GluR2, and GluR3 gene expression was examined by in situ hybridization in postischemic rats. Following severe, transient forebrain ischemia GluR2 gene expression was preferentially reduced in CA1 hippocampal neurons at a time point that preceded their degeneration. The switch in expression of kainate/AMPA receptor subunits coincided with the previously reported increase in Ca2+ influx into CA1 cells. Timing of the switch indicates that it may play a causal role in postischemic cell death.

  18. Liver alpha-amylase gene expression as an early obesity biomarker.

    Science.gov (United States)

    Mojbafan, Marzieh; Afsartala, Zohreh; Amoli, Mahsa M; Mahmoudi, Mahdi; Yaghmaei, Parichehreh; Larijani, Bagher; Ebrahim-Habibi, Azadeh

    2017-04-01

    Obesity is a major health problem worldwide, for which preventive and therapeutic means are still needed. Alpha-amylase is a digestive enzyme whose inhibition has been targeted as a potential anti-obesity strategy. However, alpha-amylase gene expression has not been particularly attended to, and in contrast with pancreatic and salivary amylases, fewer studies have focused on liver alpha-amylase. The present study aimed at investigating the expression of alpha-amylase gene in obese and normal mice at RNA and protein level as well as acarbose effect on this gene expression in hepatocyte cell culture. Control and case groups were fed by normal mouse pellet and high-fat diet respectively, during 8 weeks. After this period, serum biochemical parameters including glucose, cholesterol, triglycerides, AST, ALT and alpha-amylase were assayed. Liver alpha-amylase gene was analyzed by real time PCR, and liver enzyme was assayed with Bernfeld and ELISA methods Hepatocyte cell culture derived from both group were also treated by acarbose and alpha-amylase activity and gene expression was analyzed by above mentioned methods. All biochemical factors showed an increase in obese mice, but the increase in ALT and AST were not statistically significant. Alpha-amylase levels were also increased in obese mice, both at RNA and protein level, while a decrease was seen in obese mice derived hepatocytes after acarbose treatment. Elevated liver alpha-amylase levels may be indicative of initial stages of obesity and the use of acarbose could be considered as a treatment of obesity which could be potentially effective at multiple levels. Copyright © 2016. Published by Elsevier Urban & Partner Sp. z o.o.

  19. Enzyme-coding genes as molecular clocks: the molecular evolution of animal alpha-amylases.

    Science.gov (United States)

    Hickey, D A; Benkel, B F; Boer, P H; Genest, Y; Abukashawa, S; Ben-David, G

    1987-01-01

    We constructed a cDNA library for the beetle, Tribolium castaneum. This library was screened using a cloned amylase gene from Drosophila melanogaster as a molecular probe. Beetle amylase cDNA clones were isolated from this bank, and the nucleotide sequence was obtained for a cDNA clone with a coding capacity for 228 amino acids. Both the nucleotide sequence and predicted amino acid sequence were compared to our recent results for D. melanogaster alpha-amylases, along with published sequences for other alpha-amylases. The results show that animal alpha-amylases are highly conserved over their entire length. A broader comparison, which includes plant and microbial alpha-amylase sequences, indicates that parts of the gene are conserved between prokaryotes, plants, and animals. We discuss the potential importance of this and other enzyme-coding genes for the construction of molecular phylogenies and for the study of the general question of molecular clocks in evolution.

  20. Drift diffusion model of reward and punishment learning in rare alpha-synuclein gene carriers.

    Science.gov (United States)

    Moustafa, Ahmed A; Kéri, Szabolcs; Polner, Bertalan; White, Corey

    2017-03-20

    To understand the cognitive effects of alpha-synuclein polymorphism, we employed a drift diffusion model (DDM) to analyze reward- and punishment-guided probabilistic learning task data of participants with the rare alpha-synuclein gene duplication and age- and education-matched controls. Overall, the DDM analysis showed that, relative to controls, asymptomatic alpha-synuclein gene duplication carriers had significantly increased learning from negative feedback, while they tended to show impaired learning from positive feedback. No significant differences were found in response caution, response bias, or motor/encoding time. We here discuss the implications of these computational findings to the understanding of the neural mechanism of alpha-synuclein gene duplication.

  1. Tobacco plants transformed with the bean. alpha. ai gene express an inhibitor of insect. alpha. -amylase in their seeds. [Nicotiana tabacum; Tenebrio molitor

    Energy Technology Data Exchange (ETDEWEB)

    Altabella, T.; Chrispeels, M.J. (Univ. of California, San Diego, La Jolla (USA))

    1990-06-01

    Bean (Phaseolus vulgaris L.) seeds contain a putative plant defense protein that inhibits insect and mammalian but not plant {alpha}-amylases. We recently presented strong circumstantial evidence that this {alpha}-amylase inhibitor ({alpha}Al) is encoded by an already-identified lectin gene whose product is referred to as lectin-like-protein (LLP). We have now made a chimeric gene consisting of the coding sequence of the lectin gene that encodes LLP and the 5{prime} and 3{prime} flanking sequences of the lectin gene that encodes phytohemagglutinin-L. When this chimeric gene was expressed in transgenic tobacco (Nicotiana tabacum), we observed in the seeds a series of polypeptides (M{sub r} 10,000-18,000) that cross-react with antibodies to the bean {alpha}-amylase inhibitor. Most of these polypeptides bind to a pig pancreas {alpha}-amylase affinity column. An extract of the seeds of the transformed tobacco plants inhibits pig pancreas {alpha}-amylase activity as well as the {alpha}-amylase present in the midgut of Tenebrio molitor. We suggest that introduction of this lectin gene (to be called {alpha}ai) into other leguminous plants may be a strategy to protect the seeds from the seed-eating larvae of Coleoptera.

  2. Susceptibility effects of GABA receptor subunit alpha-2 (GABRA2) variants and parental monitoring on externalizing behavior trajectories: Risk and protection conveyed by the minor allele.

    Science.gov (United States)

    Trucco, Elisa M; Villafuerte, Sandra; Heitzeg, Mary M; Burmeister, Margit; Zucker, Robert A

    2016-02-01

    Understanding factors increasing susceptibility to social contexts and predicting psychopathology can help identify targets for prevention. Persistently high externalizing behavior in adolescence is predictive of psychopathology in adulthood. Parental monitoring predicts low externalizing behavior, yet youth likely vary in the degree to which they are affected by parents. Genetic variants of GABA receptor subunit alpha-2 (GABRA2) may increase susceptibility to parental monitoring, thus impacting externalizing trajectories. We had several objectives: (a) to determine whether GABRA2 (rs279827, rs279826, rs279858) moderates the relationship between a component of parental monitoring, parental knowledge, and externalizing trajectories; (b) to test the form of this interaction to assess whether GABRA2 variants reflect risk (diathesis-stress) or susceptibility (differential susceptibility) factors; and (c) to clarify GABRA2 associations on the development of problem behavior. This prospective study (N = 504) identified three externalizing trajectory classes (i.e., low, decreasing, and high) across adolescence. A GABRA2 × Parental Monitoring effect on class membership was observed, such that A-carriers were largely unaffected by parental monitoring, whereas class membership for those with the GG genotype was affected by parental monitoring. Findings support differential susceptibility in GABRA2.

  3. The essential role of hippocampal alpha6 subunit-containing GABAA receptors in maternal separation stress-induced adolescent depressive behaviors.

    Science.gov (United States)

    Yang, Linjie; Xu, Ting; Zhang, Ke; Wei, Zhisheng; Li, Xuran; Huang, Mingfa; Rose, Gregory M; Cai, Xiang

    2016-10-15

    Exposure to early stressful adverse life events such as maternal separation severely impacts the development of the nervous system. Using immunohistochemistry, quantitative PCR and Western blot approaches, we found that alpha6 subunit-containing GABAA receptors (Gabra6-containing GABAA Rs) were expressed on hippocampal interneurons of adolescent rats. Maternal separation stress (MS) from postnatal day 2 to15 significantly reduced Gabra6 expression and provoked depressive behaviors such as anhedonia. Furosemide, the selective antagonist of Gabra6-containing GABAARs, strongly increased peak amplitude of evoked IPSCs at CA3-CA1 synapses and the frequency of miniature IPSPs recorded from CA1 pyramidal cells in naive control animals, and this effect was occluded in MS animals. Knockdown of Gabra6 expression in hippocampus mimicked furosemide's effect and was sufficient to produce similar depressive symptoms that were observed in MS animals. These results indicate that the Gabra6-containing GABAA R is a key modulator of hippocampal synaptic transmission and likely plays a crucial role in the pathophysiology of maternal separation-induced depression.

  4. Hepatic gene expression profiling using GeneChips in zebrafish exposed to 17{alpha}-methyldihydrotestosterone

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, J.L.; Thomason, R.G.; Lee, D.M.; Brill, J.L.; Price, B.B.; Carr, G.J. [Miami Valley Innovation Center, Procter and Gamble Company, P.O. Box 538707, Cincinnati, OH 45253-8707 (United States); Versteeg, D.J. [Miami Valley Innovation Center, Procter and Gamble Company, P.O. Box 538707, Cincinnati, OH 45253-8707 (United States)], E-mail: versteeg.dj@pg.com

    2008-04-28

    Concentration and time-dependent changes in hepatic gene expression were examined in adult, female zebrafish (Danio rerio) exposed to 0, 0.1, 0.7, 4.9 {mu}g/L of a model androgen, 17{alpha}-methyldihydrotestosterone (MDHT). At 24 and 168 h, fish were sacrificed and liver was extracted for gene expression analysis using custom Affymetrix GeneChip Zebrafish Genome Microarrays. In an effort to link gene expression changes to higher levels of biological organization, blood was collected for measurement of plasma steroid hormones (17{beta}-estradiol (E2), testosterone (T)) and vitellogenin (VTG) using ELISA. Body and ovary weight were also measured. A significant reduction in E2 occurred at 24 h (0.7 and 4.9 {mu}g/L) and 168 h (4.9 {mu}g/L) following MDHT exposure. In contrast, T was significantly increased at 24 h (4.9 {mu}g/L) and 168 h (0.1, 0.7, 4.9 {mu}g/L). 171 and 575 genes were significantly affected in a concentration-dependent manner at either 24 or 168 h by MDHT exposure at p {<=} 0.001 and p {<=} 0.01, respectively. Genes involved in retinoic acid metabolism (e.g. aldehyde dehydrogenase 8, member A1; retinol dehydrogenase 12), steroid biosynthesis and metabolism (e.g. hydroxysteroid (11{beta}) dehydrogenase 2; hydroxy-delta-5-steroid dehydrogenase, 3 beta-), hormone transport (e.g. sex hormone binding globulin), and regulation of cell growth and proliferation (e.g. N-myc downstream regulated gene 1; spermidinespermine N(1)-acetyltransferase) were affected by MDHT exposure. In this study, we identified genes involved in a variety of biological processes that have the potential to be used as markers of exposure to androgenic substances. Genes identified in this study provide information on the potential mode of action of strong androgens in female fish. In addition, when used for screening of EDC's, these genes may also serve as sensitive markers of exposure to androgenic compounds.

  5. Karyopherin alpha2: a control step of glucose-sensitive gene expression in hepatic cells.

    Science.gov (United States)

    Guillemain, Ghislaine; Muñoz-Alonso, Maria J; Cassany, Aurélia; Loizeau, Martine; Faussat, Anne-Marie; Burnol, Anne-Françoise; Leturque, Armelle

    2002-05-15

    Glucose is required for an efficient expression of the glucose transporter GLUT2 and other genes. We have shown previously that the intracytoplasmic loop of GLUT2 can divert a signal, resulting in the stimulation of glucose-sensitive gene transcription. In the present study, by interaction with the GLUT2 loop, we have cloned the rat karyopherin alpha2, a receptor involved in nuclear import. The specificity of the binding was restricted to GLUT2, and not GLUT1 or GLUT4, and to karyopherin alpha2, not alpha1. When rendered irreversible by a cross-linking agent, this transitory interaction was detected in vivo in hepatocytes. A role for karyopherin alpha2 in the transcription of two glucose-sensitive genes was investigated by transfection of native and inactive green fluorescent protein-karyopherin alpha2 in GLUT2-expressing hepatoma cells. The amount of inactive karyopherin alpha2 receptor reduced, in a dose-dependent manner, the GLUT2 and liver pyruvate kinase mRNA levels by competition with endogenous active receptor. In contrast, the overexpression of karyopherin alpha2 did not significantly stimulate GLUT2 and liver pyruvate kinase mRNA accumulation in green fluorescent protein-sorted cells. The present study suggests that, in concert with glucose metabolism, karyopherin alpha2 transmits a signal to the nucleus to regulate glucose-sensitive gene expression. The transitory tethering of karyopherin alpha2 to GLUT2 at the plasma membrane might indicate that the receptor can load the cargo to be imported locally.

  6. Genetic recombination within the human T-cell receptor. cap alpha. -chain gene complex

    Energy Technology Data Exchange (ETDEWEB)

    Robinson, M.A.; Kindt, T.J.

    1987-12-01

    Genetic analyses of the human T-cell receptor (TCR) ..cap alpha..-chain genes indicate that recombination events may occur frequently within this gene complex. Examination of the inheritance of restriction fragment length polymorphisms (RFLP) detected by using probes for constant or variable region gene segments made it possible to assign TCR..cap alpha.. haplotypes to the 16 parents and 43 offspring of eight families studied. A total of six RFLP, three for the constant region and three for variable region segments, were examined in the present studies. Most enzyme and probe combinations tested revealed no polymorphism and those finally selected for the study showed limited polymorphism in that only two or, in one case, three allelic forms of the gene were seen. In spite of limited variability at this level, extensive heterogeneity was observed for the combinations of markers present in haplotypes, suggesting that frequent recombination events have occurred. Most strikingly, multiple combinations of RFLP occurring in close proximity of the TCR..cap alpha.. constant region gene were observed in this study. A high recombination frequency for the TCR..cap alpha.. gene complex is further supported by the observation that two children, one in each of two families, inherited recombinant TCR..cap alpha.. haplotypes.

  7. Extracellular signal-regulated kinase mediates gonadotropin subunit gene expression and LH release responses to endogenous gonadotropin-releasing hormones in goldfish.

    Science.gov (United States)

    Klausen, Christian; Booth, Morgan; Habibi, Hamid R; Chang, John P

    2008-08-01

    The possible involvement of extracellular signal-regulated kinase (ERK) in mediating the stimulatory actions of two endogenous goldfish gonadotropin-releasing hormones (salmon (s)GnRH and chicken (c)GnRH-II) on gonadotropin synthesis and secretion was examined. Western blot analysis revealed the presence of ERK and phosphorylated (p)ERK in goldfish brain, pituitary, liver, ovary, testis and muscle tissue extracts, as well as extracts of dispersed goldfish pituitary cells and HeLa cells. Interestingly, a third ERK-like immunoreactive band of higher molecular mass was detected in goldfish tissue and pituitary cell extracts in addition to the ERK1-p44- and ERK2-p42-like immunoreactive bands. Incubation of primary cultures of goldfish pituitary cells with either a PKC-activating 4beta-phorbol ester (TPA) or a synthetic diacylglycerol, but not a 4alpha-phorbol ester, elevated the ratio of pERK/total (t)ERK for all three ERK isoforms. The stimulatory effects of TPA were attenuated by the PKC inhibitor GF109203X and the MEK inhibitor PD98059. sGnRH and cGnRH-II also elevated the ratio of pERK/tERK for all three ERK isoforms, in a time-, dose- and PD98059-dependent manner. In addition, treatment with PD98059 reduced the sGnRH-, cGnRH-II- and TPA-induced increases in gonadotropin subunit mRNA levels in Northern blot studies and sGnRH- and cGnRH-II-elicited LH release in cell column perifusion studies with goldfish pituitary cells. These results indicate that GnRH and PKC can activate ERK through MEK in goldfish pituitary cells. More importantly, the present study suggests that GnRH-induced gonadotropin subunit gene expression and LH release involve MEK/ERK signaling in goldfish.

  8. Height in pre- and postmenopausal women is influenced by estrogen receptor alpha gene polymorphisms

    NARCIS (Netherlands)

    J.B.J. van Meurs (Joyce); A.P. Bergink (Arjan); M. van de Klift (Marjolein); Y. Fang (Yue); G. Leusink (Geraline); A.G. Uitterlinden (André); H.A.P. Pols (Huib); J.P.T.M. van Leeuwen (Hans); S.C.E. Schuit (Stephanie); A. Hofman (Albert)

    2004-01-01

    textabstractThe estrogen receptor alpha gene (ESR1) is known to be involved in metabolic pathways influencing growth. We have performed two population-based association studies using three common polymorphisms within this candidate gene to determine whether these are associated with variation in adu

  9. Chromosomal Integration and Expression of Two Bacterial alpha-Acetolactate Decarboxylase Genes in Brewer's Yeast.

    Science.gov (United States)

    Blomqvist, K; Suihko, M L; Knowles, J; Penttilä, M

    1991-10-01

    A bacterial gene encoding alpha-acetolactate decarboxylase, isolated from Klebsiella terrigena or Enterobacter aerogenes, was expressed in brewer's yeast. The genes were expressed under either the yeast phosphoglycerokinase (PGK1) or the alcohol dehydrogenase (ADH1) promoter and were integrated by gene replacement by using cotransformation into the PGK1 or ADH1 locus, respectively, of a brewer's yeast. The expression level of the alpha-acetolactate decarboxylase gene of the PGK1 integrant strains was higher than that of the ADH1 integrants. Under pilot-scale brewing conditions, the alpha-acetolactate decarboxylase activity of the PGK1 integrant strains was sufficient to reduce the formation of diacetyl below the taste threshold value, and no lagering was needed. The brewing properties of the recombinant yeast strains were otherwise unaltered, and the quality (most importantly, the flavor) of the trial beers produced was as good as that of the control beer.

  10. Versatility of the carboxy-terminal domain of the alpha subunit of RNA polymerase in transcriptional activation: use of the DNA contact site as a protein contact site for MarA.

    Science.gov (United States)

    Dangi, Bindi; Gronenborn, Angela M; Rosner, Judah L; Martin, Robert G

    2004-10-01

    The transcriptional activator, MarA, interacts with RNA polymerase (RNAP) to activate promoters of the mar regulon. Here, we identify the interacting surfaces of MarA and of the carboxy-terminal domain of the alpha subunit of RNAP (alpha-CTD) by NMR-based chemical shift mapping. Spectral changes were monitored for a MarA-DNA complex upon titration with alpha-CTD, and for alpha-CTD upon titration with MarA-DNA. The mapping results were confirmed by mutational studies and retention chromatography. A model of the ternary complex shows that alpha-CTD uses a '265-like determinant' to contact MarA at a surface distant from the DNA. This is unlike the interaction of alpha-CTD with the CRP or Fis activators where the '265 determinant' contacts DNA while another surface of the same alpha-CTD molecule contacts the activator. These results reveal a new versatility for alpha-CTD in transcriptional activation.

  11. Genetic mapping of the LMP2 proteasome subunit gene to the BoLA class IIb region

    Energy Technology Data Exchange (ETDEWEB)

    Shalhevet, D.; Da, Y.; Beever, J.E.; Eijk, M.J.T. van; Ma, R.; Lewin, H.A.; Gaskins, H.R. [Univ. of Illinois, Champaign, IL (United States)

    1995-01-01

    Recent identification of four tightly-linked genes within the class II region of the major histocompatibility complex (MHC) in humans and rodents has led to a better understanding of class I antigen processing mechanisms. Two of these genes, LMP2 and LMP7, encode subunits of a low molecular mass poypeptide (LMP) complex. Several observations suggest that the LMP complex may be the proteolytic system responsible for generating the size-restricted peptides required for MHC class I assembly. For example, the LMP complex is a large cytoplasmic structure that is antigenically and biochemically related to the proteasome, a proteolytic complex that mediates degradation of ubiquitinated substrates. Data regarding proteolytic specificity indicates that the LMP complex may specifically produce nonamers, the appropriate peptide size for class I binding. In addition, similar to all components of the class I assembly process, intra-MHC LMP genes are regulated by IFN{gamma}. 26 refs., 2 figs., 1 tab.

  12. Mitochondrial genome from the facultative anaerobe and petite-positive yeast Dekkera bruxellensis contains the NADH dehydrogenase subunit genes.

    Science.gov (United States)

    Procházka, Emanuel; Poláková, Silvia; Piskur, Jure; Sulo, Pavol

    2010-08-01

    The progenitor of the Dekkera/Brettanomyces clade separated from the Saccharomyces/Kluyveromyces clade over 200 million years ago. However, within both clades, several lineages developed similar physiological traits. Both Saccharomyces cerevisiae and Dekkera bruxellensis are facultative anaerobes; in the presence of excess oxygen and sugars, they accumulate ethanol (Crabtree effect) and they both spontaneously generate respiratory-deficient mutants (petites). In order to understand the role of respiratory metabolism, the mitochondrial DNA (mtDNA) molecules of two Dekkera/Brettanomyces species were analysed. Dekkera bruxellensis mtDNA shares several properties with S. cerevisiae, such as the large genome size (76 453 bp), and the organization of the intergenic sequences consisting of spacious AT-rich regions containing a number of hairpin GC-rich cluster-like elements. In addition to a basic set of the mitochondrial genes coding for the components of cytochrome oxidase, cytochrome b, subunits of ATPase, two rRNA subunits and 25 tRNAs, D. bruxellensis also carries genes for the NADH dehydrogenase complex. Apparently, in yeast, the loss of this complex is not a precondition to develop a petite-positive, Crabtree-positive and anaerobic nature. On the other hand, mtDNA from a petite-negative Brettanomyces custersianus is much smaller (30 058 bp); it contains a similar gene set and has only short intergenic sequences.

  13. Conserved cis-regulatory modules in promoters of genes encoding wheat high-molecular-weight glutenin subunits.

    Science.gov (United States)

    Ravel, Catherine; Fiquet, Samuel; Boudet, Julie; Dardevet, Mireille; Vincent, Jonathan; Merlino, Marielle; Michard, Robin; Martre, Pierre

    2014-01-01

    The concentration and composition of the gliadin and glutenin seed storage proteins (SSPs) in wheat flour are the most important determinants of its end-use value. In cereals, the synthesis of SSPs is predominantly regulated at the transcriptional level by a complex network involving at least five cis-elements in gene promoters. The high-molecular-weight glutenin subunits (HMW-GS) are encoded by two tightly linked genes located on the long arms of group 1 chromosomes. Here, we sequenced and annotated the HMW-GS gene promoters of 22 electrophoretic wheat alleles to identify putative cis-regulatory motifs. We focused on 24 motifs known to be involved in SSP gene regulation. Most of them were identified in at least one HMW-GS gene promoter sequence. A common regulatory framework was observed in all the HMW-GS gene promoters, as they shared conserved cis-regulatory modules (CCRMs) including all the five motifs known to regulate the transcription of SSP genes. This common regulatory framework comprises a composite box made of the GATA motifs and GCN4-like Motifs (GLMs) and was shown to be functional as the GLMs are able to bind a bZIP transcriptional factor SPA (Storage Protein Activator). In addition to this regulatory framework, each HMW-GS gene promoter had additional motifs organized differently. The promoters of most highly expressed x-type HMW-GS genes contain an additional box predicted to bind R2R3-MYB transcriptional factors. However, the differences in annotation between promoter alleles could not be related to their level of expression. In summary, we identified a common modular organization of HMW-GS gene promoters but the lack of correlation between the cis-motifs of each HMW-GS gene promoter and their level of expression suggests that other cis-elements or other mechanisms regulate HMW-GS gene expression.

  14. Exercise promotes alpha7 integrin gene transcription and protection of skeletal muscle.

    Science.gov (United States)

    Boppart, Marni D; Volker, Sonja E; Alexander, Nicole; Burkin, Dean J; Kaufman, Stephen J

    2008-11-01

    The alpha7beta1 integrin is increased in skeletal muscle in response to injury-producing exercise, and transgenic overexpression of this integrin in mice protects against exercise-induced muscle damage. The present study investigates whether the increase in the alpha7beta1 integrin observed in wild-type mice in response to exercise is due to transcriptional regulation and examines whether mobilization of the integrin at the myotendinous junction (MTJ) is a key determinant in its protection against damage. A single bout of downhill running exercise selectively increased transcription of the alpha7 integrin gene in 5-wk-old wild-type mice 3 h postexercise, and an increased alpha7 chain was detected in muscle sarcolemma adjacent to tendinous tissue immediately following exercise. The alpha7B, but not alpha7A isoform, was found concentrated and colocalized with tenascin-C in muscle fibers lining the MTJ. To further validate the importance of the integrin in the protection against muscle damage following exercise, muscle injury was quantified in alpha7(-/-) mice. Muscle damage was extensive in alpha7(-/-) mice in response to both a single and repeated bouts of exercise and was largely restricted to areas of high MTJ concentration and high mechanical force near the Achilles tendon. These results suggest that exercise-induced muscle injury selectively increases transcription of the alpha7 integrin gene and promotes a rapid change in the alpha7beta integrin at the MTJ. These combined molecular and cellular alterations are likely responsible for integrin-mediated attenuation of exercise-induced muscle damage.

  15. Nucleotide sequence of a crustacean 18S ribosomal RNA gene and secondary structure of eukaryotic small subunit ribosomal RNAs.

    Science.gov (United States)

    Nelles, L; Fang, B L; Volckaert, G; Vandenberghe, A; De Wachter, R

    1984-12-11

    The primary structure of the gene for 18 S rRNA of the crustacean Artemia salina was determined. The sequence has been aligned with 13 other small ribosomal subunit RNA sequences of eukaryotic, archaebacterial, eubacterial, chloroplastic and plant mitochondrial origin. Secondary structure models for these RNAs were derived on the basis of previously proposed models and additional comparative evidence found in the alignment. Although there is a general similarity in the secondary structure models for eukaryotes and prokaryotes, the evidence seems to indicate a different topology in a central area of the structures.

  16. [Cloning and structure of gene encoded alpha-latrocrustoxin from the Black widow spider venom].

    Science.gov (United States)

    Danilevich, V N; Luk'ianov, S A; Grishin, E V

    1999-07-01

    The primary structure of the crusta gene encoding alpha-latrocrustoxin (alpha-LCT), a high molecular mass neurotoxin specific to crustaceans, was determined in the black widow spider Latrodectus mactans tredicimguttatus genome. The total length of the sequenced DNA was 4693 bp. The structural part of the black widow spider chromosome gene encoding alpha-LCT does not contain introns. The sequenced DNA contains a single extended open reading frame (4185 bp) and encodes a protein precursor of alpha-LCT, comprising 1395 aa. We assume the Met residue at position -10 relative to the N-terminal residue of Glu1 of the mature toxin to be the first one in the protein precursor. The calculated molecular mass of the precursor (156147 Da) exceeds that of the mature toxin by approximately 30 kDa. These data are in agreement with the notion that over the course of maturation the protein precursor undergoes double processing--cleavage of a decapeptide from the N-terminal part and of a approximately 200-aa fragment from the C-terminal part. alpha-LCT displayed a number of imperfect ankyrin-like repeats and areas of structural homology with earlier studied latrotoxins; the highest homology degree (62%) was revealed with alpha-latroinsectotoxin (alpha-LIT).

  17. Identification of two novel deletion mutations within the Gs alpha gene (GNAS1) in Albright hereditary osteodystrophy.

    Science.gov (United States)

    Yu, D; Yu, S; Schuster, V; Kruse, K; Clericuzio, C L; Weinstein, L S

    1999-09-01

    Albright hereditary osteodystrophy (AHO) is a genetic disorder characterized by short stature, skeletal defects, and obesity. Within AHO kindreds, some affected family members have only the somatic features of AHO [pseudopseudohypoparathyroidism (PPHP)], whereas others have these features in association with resistance to multiple hormones that stimulate adenylyl cyclase within their target tissues [pseudohypoparathyroidism type Ia (PHP Ia)]. Affected members of most AHO kindreds (both those with PPHP and those with PHP Ia) have a partial deficiency of Gs alpha, the alpha-subunit of the G protein that couples receptors to adenylyl cyclase stimulation, and in a number of cases heterozygous loss of function mutations within the Gs alpha gene (GNAS1) have been identified. Using PCR with the attachment of a high melting domain (GC-clamp) and temperature gradient gel electrophoresis, two novel heterozygous frameshift mutations within GNAS1 were found in two AHO kindreds. In one kindred all affected members (both PHP Ia and PPHP) had a heterozygous 2-bp deletion in exon 8, whereas in the second kindred a heterozygous 2-bp deletion in exon 4 was identified in all affected members examined. In both cases the frameshift encoded a premature termination codon several codons downstream of the deletion. In the latter kindred affected members were previously shown to have decreased levels of GNAS1 messenger ribonucleic acid expression. These results further underscore the genetic heterogeneity of AHO and provides further evidence that PHP Ia and PPHP are two clinical presentations of a common genetic defect. Serial measurements of thyroid function in members of kindred 1 indicate that TSH resistance progresses with age and becomes more evident after the first year of life.

  18. Cloning, expression and molecular analysis of Iranian Brucella melitensis Omp25 gene for designing a subunit vaccine

    Science.gov (United States)

    Yousefi, Soheil; Tahmoorespur, Mojtaba; Sekhavati, Mohammad Hadi

    2016-01-01

    Brucellosis is a well-known domestic animal infectious disease, which is caused by Brucella bacterium. The outer membrane protein 25 kDa (Omp25) gene plays an important role in simulating of TNF-α, IFN-α, macrophage, and cytokines cells. In the current study molecular cloning and expression analysis of Omp25 gene for designing a subunit vaccine against Brucella was investigated. Amplifying the full length of candidate gene was performed using specific primers. Sub-cloning of this gene conducted using pTZ57R/T vector in TOP10F strain of Escherichia coli(E.coli) as the host. Also, pET32(a)+ vector used for expression in BL21 (DE3) strain of E.coli. Omp25 gene with 642 bp size was amplified and cloned successfully. The expression results were confirmed by sequencing and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analyses which showed 42 kDa protein band correctly. Also, phylogenic analysis showed this gene has a near genetic relation with other Brucella strains. According to our results we can propose this gene as a candidate useful for stimulation of cell-mediated and humoral immunity system in future study. PMID:27920824

  19. Association study of the interleukin-1 gene complex and tumor necrosis factor alpha gene with suicide attempts.

    Science.gov (United States)

    Sáiz, Pilar A; García-Portilla, Paz; Paredes, Begoña; Arango, Celso; Morales, Blanca; Alvarez, Victoria; Coto, Eliécer; Bascarán, María-Teresa; Bousoño, Manuel; Bobes, Julio

    2008-06-01

    To investigate the association between four functional polymorphisms in interleukin-1 (IL-1) [IL-1 alpha -889 C/T, IL-1 beta +3953 C/T, IL-1RA (86 bp)n] and tumor necrosis factor alpha (TNFalpha) (-308A/G) genes and suicide attempts. Distribution of the aforesaid polymorphisms was analyzed in 193 suicide attempters compared with 420 unrelated healthy controls from Asturias (Northern Spain). Genotypes were determined using standard methods. No significant differences were found in genotype or in allelic distribution of IL-1 alpha, IL-1 beta, IL-1RA, or TNFalpha gene polymorphisms. No relationship was found between genotypes and the impulsivity of the suicide attempt. Estimated IL-1 haplotype frequencies were similar in both groups (likelihood ratio test=13.26, df=14, P=0.506). Our data do not suggest that genetically determined changes in the IL-1 or TNFalpha genes confer increased susceptibility to suicidal behavior.

  20. Interferon-alpha (Intron A) upregulates urokinase-type plasminogen activator receptor gene expression.

    Science.gov (United States)

    Wu, Shanshan; Murrell, George A C; Wang, Yao

    2002-07-01

    The regulation of urokinase plasminogen activator receptor (uPAR) gene expression by interferon-alpha (IFN-alpha, or Intron A) and interferon-gamma (IFN-gamma) was studied in a HCT116 colon cancer cell line. uPAR mRNA levels were increased in a dose- and time-dependent manner in cells stimulated with IFN-alpha or IFN-gamma. uPAR protein levels reflected IFN-alpha and IFN-gamma induction of uPAR mRNA production. Cycloheximide, a protein synthesis inhibitor, also induced uPAR mRNA accumulation either alone or in combination with IFN-alpha or IFN-gamma, suggesting that the effect on uPAR mRNA levels activated by IFN-alpha or IFN-gamma does not require de novo protein synthesis. Both sodium butyrate and amiloride inhibited the uPAR mRNA levels induced by IFN-alpha or IFN-gamma. These results may provide useful information for the treatment of patients receiving IFN-alpha or IFN-gamma.

  1. Gene expression profile of sodium channel subunits in the anterior cingulate cortex during experimental paclitaxel-induced neuropathic pain in mice

    Science.gov (United States)

    2016-01-01

    Paclitaxel, a chemotherapeutic agent, causes neuropathic pain whose supraspinal pathophysiology is not fully understood. Dysregulation of sodium channel expression, studied mainly in the periphery and spinal cord level, contributes to the pathogenesis of neuropathic pain. We examined gene expression of sodium channel (Nav) subunits by real time polymerase chain reaction (PCR) in the anterior cingulate cortex (ACC) at day 7 post first administration of paclitaxel, when mice had developed paclitaxel-induced thermal hyperalgesia. The ACC was chosen because increased activity in the ACC has been observed during neuropathic pain. In the ACC of vehicle-treated animals the threshold cycle (Ct) values for Nav1.4, Nav1.5, Nav1.7, Nav1.8 and Nav1.9 were above 30 and/or not detectable in some samples. Thus, comparison in mRNA expression between untreated control, vehicle-treated and paclitaxel treated animals was done for Nav1.1, Nav1.2, Nav1.3, Nav1.6, Nax as well as Navβ1–Navβ4. There were no differences in the transcript levels of Nav1.1–Nav1.3, Nav1.6, Nax, Navβ1–Navβ3 between untreated and vehicle-treated mice, however, vehicle treatment increased Navβ4 expression. Paclitaxel treatment significantly increased the mRNA expression of Nav1.1, Nav1.2, Nav1.6 and Nax, but not Nav1.3, sodium channel alpha subunits compared to vehicle-treated animals. Treatment with paclitaxel significantly increased the expression of Navβ1 and Navβ3, but not Navβ2 and Navβ4, sodium channel beta subunits compared to vehicle-treated animals. These findings suggest that during paclitaxel-induced neuropathic pain (PINP) there is differential upregulation of sodium channels in the ACC, which might contribute to the increased neuronal activity observed in the area during neuropathic pain. PMID:27896032

  2. Gene expression profile of sodium channel subunits in the anterior cingulate cortex during experimental paclitaxel-induced neuropathic pain in mice

    Directory of Open Access Journals (Sweden)

    Willias Masocha

    2016-11-01

    Full Text Available Paclitaxel, a chemotherapeutic agent, causes neuropathic pain whose supraspinal pathophysiology is not fully understood. Dysregulation of sodium channel expression, studied mainly in the periphery and spinal cord level, contributes to the pathogenesis of neuropathic pain. We examined gene expression of sodium channel (Nav subunits by real time polymerase chain reaction (PCR in the anterior cingulate cortex (ACC at day 7 post first administration of paclitaxel, when mice had developed paclitaxel-induced thermal hyperalgesia. The ACC was chosen because increased activity in the ACC has been observed during neuropathic pain. In the ACC of vehicle-treated animals the threshold cycle (Ct values for Nav1.4, Nav1.5, Nav1.7, Nav1.8 and Nav1.9 were above 30 and/or not detectable in some samples. Thus, comparison in mRNA expression between untreated control, vehicle-treated and paclitaxel treated animals was done for Nav1.1, Nav1.2, Nav1.3, Nav1.6, Nax as well as Navβ1–Navβ4. There were no differences in the transcript levels of Nav1.1–Nav1.3, Nav1.6, Nax, Navβ1–Navβ3 between untreated and vehicle-treated mice, however, vehicle treatment increased Navβ4 expression. Paclitaxel treatment significantly increased the mRNA expression of Nav1.1, Nav1.2, Nav1.6 and Nax, but not Nav1.3, sodium channel alpha subunits compared to vehicle-treated animals. Treatment with paclitaxel significantly increased the expression of Navβ1 and Navβ3, but not Navβ2 and Navβ4, sodium channel beta subunits compared to vehicle-treated animals. These findings suggest that during paclitaxel-induced neuropathic pain (PINP there is differential upregulation of sodium channels in the ACC, which might contribute to the increased neuronal activity observed in the area during neuropathic pain.

  3. Screening for mutations in human alpha-globin genes by nonradioactive single-strand conformation polymorphism

    Directory of Open Access Journals (Sweden)

    Jorge S.B.

    2003-01-01

    Full Text Available Point mutations and small insertions or deletions in the human alpha-globin genes may produce alpha-chain structural variants and alpha-thalassemia. Mutations can be detected either by direct DNA sequencing or by screening methods, which select the mutated exon for sequencing. Although small (about 1 kb, 3 exons and 2 introns, the alpha-globin genes are duplicate (alpha2 and alpha1 and highy G-C rich, which makes them difficult to denature, reducing sequencing efficiency and causing frequent artifacts. We modified some conditions for PCR and electrophoresis in order to detect mutations in these genes employing nonradioactive single-strand conformation polymorphism (SSCP. Primers previously described by other authors for radioactive SSCP and phast-SSCP plus denaturing gradient gel electrophoresis were here combined and the resultant fragments (6 new besides 6 original per alpha-gene submitted to silver staining SSCP. Nine structural and one thalassemic mutations were tested, under different conditions including two electrophoretic apparatus (PhastSystem(TM and GenePhor(TM, Amersham Biosciences, different polyacrylamide gel concentrations, run temperatures and denaturing agents, and entire and restriction enzyme cut fragments. One hundred percent of sensitivity was achieved with four of the new fragments formed, using the PhastSystem(TM and 20% gels at 15ºC, without the need of restriction enzymes. This nonradioactive PCR-SSCP approach showed to be simple, rapid and sensitive, reducing the costs involved in frequent sequencing repetitions and increasing the reliability of the results. It can be especially useful for laboratories which do not have an automated sequencer.

  4. Gene program-specific regulation of PGC-1{alpha} activity

    DEFF Research Database (Denmark)

    Schmidt, Søren F; Mandrup, Susanne

    2011-01-01

    Peroxisome proliferator-activated receptor γ (PPARγ) coactivator 1 α (PGC-1α) activation coordinates induction of the hepatic fasting response through coactivation of numerous transcription factors and gene programs. In the June 15, 2011, issue of Genes & Development, Lustig and colleagues (pp...

  5. Platelet cytosolic 44-kDa protein is a substrate of cholera toxin-induced ADP-ribosylation and is not recognized by antisera against the. alpha. subunit of the stimulatory guanine nucleotide-binding regulatory protein

    Energy Technology Data Exchange (ETDEWEB)

    Molina Y Vedia, L.M.; Reep, B.R.; Lapetina, E.G. (Burroughs Wellcome Co., Research Triangle Park, NC (USA))

    1988-08-01

    ADP-ribosylation induced by cholera toxin and pertussis toxin was studied in particulate and cytosolic fractions of human platelets. Platelets were disrupted by a cycle of freezing and thawing in the presence of a hyposmotic buffer containing protease inhibitors. In both fractions, the A subunit of cholera toxin ADP-ribosylates two proteins with molecular masses of 42 and 44 kDa, whereas pertussis toxin ADP-ribosylates a 41-kDa polypeptide. Two antisera against the {alpha} subunit of the stimulatory guanine nucleotide-binding regulatory protein recognize only the 42-kDa polypeptide. Cholera toxin-induced ADP-ribosylation of the 42- and 44-kDa proteins is reduced by pretreatment of platelets with iloprost, a prostacyclin analog. The 44-kDa protein, which is substrate of cholera toxin, could be extracted completely from the membrane and recovered in the cytosolic fraction when the cells were disrupted by Dounce homogenization and the pellet was extensively washed. A 44-kDa protein can also be labeled with 8-azidoguanosine 5{prime}-({alpha}-{sup 32}P)triphosphate in the cytosol and membranes. These finding indicate that cholera and pertussis toxins produced covalent modifications of proteins present in particulate and cytosolic platelet fractions. Moreover, the 44-kDa protein might be an {alpha} subunit of a guanine nucleotide-binding regulatory protein that is not recognized by available antisera.

  6. GlyT1 Inhibitor NFPS Exerts Neuroprotection via GlyR Alpha1 Subunit in the Rat Model of Transient Focal Cerebral Ischaemia and Reperfusion

    Directory of Open Access Journals (Sweden)

    Baosheng Huang

    2016-05-01

    Full Text Available Background/Aims: Glycine is a strychnine-sensitive inhibitory neurotransmitter in the central nervous system (CNS, especially in the spinal cord, brainstem, and retina. The objective of the present study was to investigate the potential neuroprotective effects of GlyT1 inhibitor N [3-(4'-fluorophenyl-3-(4'-phenylphenoxy propyl] sarcosine (NFPS in the rat model of experimental stroke. Methods: In vivo ischaemia was induced by transient middle cerebral artery occlusion (tMCAO. The methods of Western Blotting, Nissl Staining and Morris water maze methods were applied to analyze the anti-ischaemia mechanism. Results: The results showed that high dose of NFPS (H-NFPS significantly reduced infarct volume, neuronal injury and the expression of cleaved caspase-3, enhanced Bcl-2/Bax, and improved spatial learning deficits which were administered three hours after transient middle cerebral artery occlusion (tMCAO induction in rats, while, low dose of NFPS (L-NFPS exacerbated the injury of ischaemia. These findings suggested that low and high dose of NFPS produced opposite effects. Importantly, it was demonstrated that H-NFPS-dependent neuronal protection was inverted by salicylate (Sal, a specific GlyR ɑ1 antagonist. Such effects could probably be attributed to the enhanced glycine level in both synaptic and extrasynaptic clefts and the subsequently altered extrasynaptic GlyRs and their subtypes. Conclusions: These data imply that GlyT1 inhibitor NFPS may be a novel target for clinical treatment of transient focal cerebral ischaemia and reperfusion which are associated with altered GlyR alpha 1 subunits.

  7. Alanine 101 and alanine 110 of the alpha subunit of Pseudomonas stutzeri OX1 toluene-o-xylene monooxygenase influence the regiospecific oxidation of aromatics.

    Science.gov (United States)

    Vardar, Gönül; Tao, Ying; Lee, Jintae; Wood, Thomas K

    2005-12-05

    Saturation mutagenesis was used to generate 10 mutants of toluene-o-xylene monooxygenase (ToMO) at alpha subunit (TouA) positions A101 and A110: A101G, A101I, A101M, A101VE, A101V, A110G, A110C, A110S, A110P, and A110T; by testing the substrates toluene, o-cresol, m-cresol, p-cresol, phenol, naphthalene, o-methoxyphenol, m-methoxyphenol, p-methoxyphenol, o-xylene, and nitrobenzene, these positions were found to influence the regiospecific oxidation of aromatics. For example, compared to wild-type ToMO, TouA variant A101V produced threefold more 3-methoxycatechol from m-methoxyphenol as well as produced methylhydroquinone from o-cresol whereas wild-type ToMO did not. Similarly, variant A110C synthesized 1.8-fold more o-cresol from toluene and 1.8-fold more 3-methoxycatechol from m-methoxyphenol, and variant A110G synthesized more m-nitrophenol and twofold less p-nitrophenol from nitrobenzene. The A101V and A110C mutations did not affect the rate of reaction with the natural substrate toluene, so the variants had high activity. This is the first report that these or analogous residues influence the catalysis with this class of enzymes. Wild-type ToMO was found to oxidize o-methoxyphenol to methoxyhydroquinone (60%) and 4-methoxyresorcinol (40%), m-methoxyphenol to 4-methoxycatechol (96%) and 3-methoxycatechol (4%), and p-methoxyphenol to 4-methoxycatechol (100%). (c) 2005 Wiley Periodicals, Inc.

  8. Phosphatidyl-inositol-3-kinase alpha catalytic subunit mutation and response to neoadjuvant endocrine therapy for estrogen receptor positive breast cancer

    Science.gov (United States)

    Ellis, Matthew J; Lin, Li; Crowder, Robert; Tao, Yu; Hoog, Jeremy; Snider, Jacqueline; Davies, Sherri; DeSchryver, Katherine; Evans, Dean B; Steinseifer, Jutta; Bandaru, Raj; Liu, WeiHua; Gardner, Humphrey; Semiglazov, Vladimir; Watson, Mark; Hunt, Kelly; Olson, John; Baselga, José

    2010-01-01

    Background Mutations in the alpha catalytic subunit of phosphoinositol-3-kinase (PIK3CA) occur in ~30% of ER positive breast cancers. We therefore sought to determine the impact of PIK3CA mutation on response to neoadjuvant endocrine therapy. Methods Exon 9 (helical domain - HD) and Exon 20 (kinase domain- KD) mutations in PIK3CA were determined samples from four neoadjuvant endocrine therapy trials. Interactions with clinical, pathological and biomarker response parameters were examined. Results A weak negative interaction between PIK3CA mutation status and clinical response to neoadjuvant endocrine treatment was detected (N=235 P=<0.05), but not with treatment-induced changes in Ki67-based proliferation index (N=418). Despite these findings, PIK3CA KD mutation was a favorable prognostic factor for relapse-free survival (RFS log rank P=0.02) in the P024 trial (N=153). The favorable prognostic effect was maintained in a multivariable analysis (N=125) that included the preoperative prognostic index (PEPI), an approach to predicting RFS based on post neoadjuvant endocrine therapy pathological stage, ER and Ki67 levels (HR for no PIK3CA KD mutation, 14, CI 1.9–105 P=0.01). Conclusion PIK3CA mutation status did not strongly interact with neoadjuvant endocrine therapy responsiveness in estrogen receptor positive breast cancer. Nonetheless, as with other recent studies, a favorable interaction between PIK3CA kinase domain mutation and prognosis was detected. The mechanism for the favorable prognostic impact of PIK3CA mutation status therefore remains unexplained. PMID:19844788

  9. Exercise induces transient transcriptional activation of the PGC-1alpha gene in human skeletal muscle.

    Science.gov (United States)

    Pilegaard, Henriette; Saltin, Bengt; Neufer, P Darrell

    2003-02-01

    Endurance exercise training induces mitochondrial biogenesis in skeletal muscle. The peroxisome proliferator activated receptor co-activator 1alpha (PGC-1alpha) has recently been identified as a nuclear factor critical for coordinating the activation of genes required for mitochondrial biogenesis in cell culture and rodent skeletal muscle. To determine whether PGC-1alpha transcription is regulated by acute exercise and exercise training in human skeletal muscle, seven male subjects performed 4 weeks of one-legged knee extensor exercise training. At the end of training, subjects completed 3 h of two-legged knee extensor exercise. Biopsies were obtained from the vastus lateralis muscle of both the untrained and trained legs before exercise and after 0, 2, 6 and 24 h of recovery. Time to exhaustion (2 min maximum resistance), as well as hexokinase II (HKII), citrate synthase and 3-hydroxyacyl-CoA dehydrogenase mRNA, were higher in the trained than the untrained leg prior to exercise. Exercise induced a marked transient increase (P 40-fold) and mRNA content (7- to 10-fold), peaking within 2 h after exercise. Activation of PGC-1alpha was greater in the trained leg despite the lower relative workload. Interestingly, exercise did not affect nuclear respiratory factor 1 (NRF-1) mRNA, a gene induced by PGC-1alpha in cell culture. HKII, mitochondrial transcription factor A, peroxisome proliferator activated receptor alpha, and calcineurin Aalpha and Abeta mRNA were elevated (approximately 2- to 6-fold; P < 0.05) at 6 h of recovery in the untrained leg but did not change in the trained leg. The present data demonstrate that exercise induces a dramatic transient increase in PGC-1alpha transcription and mRNA content in human skeletal muscle. Consistent with its role as a transcriptional coactivator, these findings suggest that PGC-1alpha may coordinate the activation of metabolic genes in human muscle in response to exercise.

  10. hELP3 Subunit of the Elongator Complex Regulates the Transcription of HSP70 Gene in Human Cells

    Institute of Scientific and Technical Information of China (English)

    Qiuju HAN; Xiaozhe HOU; Dongmei SU; Lina PAN; Jizhou DUAN; Liguo CUI; Baiqu HUANG; Jun LU

    2007-01-01

    The human Elongator complex is remarkably similar to its yeast counterpart in several aspects.In a previous study, we analyzed the functions of the human elongation protein 3 (hELP3) subunit of the human Elongator by using an in vivo yeast complementation system. However, direct evidence for hELP3 functions in regulating gene expression in human cells was not obtained. In this study, we used hELP3 antisense oligonucleotide inhibitors to knock down hELP3 gene expression to investigate its function in human 293T cells. The results showed that specific reduction of hELP3 mRNA and protein caused a significant suppression of HSP70-2 gene expression, and this was accompanied by histone H3 hypoacetylation and decreased RNA polymerase Ⅱ density at the HSP70-2 gene. Moreover, the data also showed that hELP3 exerted the transcriptional regulatory function directly through its presence on the HSP70-2 gene. Data presented in this report provide further insight and direct evidence of the functions of hELP3 in HSP70-2 gene transcriptional elongation in human cells.

  11. alpha-Amylase gene of Streptomyces limosus: nucleotide sequence, expression motifs, and amino acid sequence homology to mammalian and invertebrate alpha-amylases.

    OpenAIRE

    1987-01-01

    The nucleotide sequence of the coding and regulatory regions of the alpha-amylase gene (aml) of Streptomyces limosus was determined. High-resolution S1 mapping was used to locate the 5' end of the transcript and demonstrated that the gene is transcribed from a unique promoter. The predicted amino acid sequence has considerable identity to mammalian and invertebrate alpha-amylases, but not to those of plant, fungal, or eubacterial origin. Consistent with this is the susceptibility of the enzym...

  12. Association of polymorphism in the alpha-1-antitrypsin gene with ...

    African Journals Online (AJOL)

    Sahand Rayaneh

    2014-06-11

    Jun 11, 2014 ... Cows with genotype AA showed a lower milk protein percentage ... Quantitative traits in dairy cattle are controlled by a large number of genes and ..... Evaluation of marker-assisted selection through computer simulation.

  13. Serotonin Transporter (5-HTT) and gamma-Aminobutyric Acid Receptor Subunit beta3 (GABRB3) Gene Polymorphisms are not Associated with Autism in the IMGSA Families

    DEFF Research Database (Denmark)

    Maestrini, E.; Lai, C.; Marlow, A.;

    1999-01-01

    Previous studies have suggested that the serotonin transporter (5-HTT) gene and the gamma-aminobutyric acid receptor subunit beta3 (GABRB3) gene, or other genes in the 15q11-q13 region, are possibly involved in susceptibility to autism. To test this hypothesis we performed an association study...... and the GABRB3 genes are unlikely to play a major role in the aetiology of autism in our family data set....

  14. Total alpha-globin gene cluster deletion has high frequency in Filipinos

    Energy Technology Data Exchange (ETDEWEB)

    Hunt, J.A.; Haruyama, A.Z.; Chu, B.M. [Kapiolani Medical Center, Honolulu, HI (United States)] [and others

    1994-09-01

    Most {alpha}-thalassemias [Thal] are due to large deletions. In Southeast Asians, the (--{sup SEA}) double {alpha}-globin gene deletion is common, 3 (--{sup Tot}) total {alpha}-globin cluster deletions are known: Filipino (--{sup Fil}), Thai (--{sup Thai}), and Chinese (--{sup Chin}). In a Hawaii Thal project, provisional diagnosis of {alpha}-Thal-1 heterozygotes was based on microcytosis, normal isoelectric focusing, and no iron deficiency. One in 10 unselected Filipinos was an {alpha}-Thal-1 heterozygote, 2/3 of these had a (--{sup Tot}) deletion: a {var_sigma}-cDNA probe consistently showed fainter intensity of the constant 5.5 kb {var_sigma}{sub 2} BamHI band, with no heterzygosity for {var_sigma}-globin region polymorphisms; {alpha}-cDNA or {var_sigma}-cDNA probes showed no BamHI or BglII bands diagnostic of the (--{sup SEA}) deletion; bands for the (-{alpha}) {alpha}-Thal-2 single {alpha}-globin deletions were only seen in Hb H cases. A reliable monoclonal anti-{var_sigma}-peptide antibody test for the (--{sup SEA}) deletion was always negative in (--{sup Tot}) samples. Southern digests with the Lo probe, a gift from D. Higgs of Oxford Univ., confirmed that 49 of 50 (--{sup Tot}) chromosomes in Filipinos were (--{sup Fil}). Of 20 {alpha}-Thal-1 hydrops born to Filipinos, 11 were (--{sup Fil}/--{sup SEA}) compound heterozygotes; 9 were (--{sup SEA}/--{sup SEA}) homozygotes, but none was a (--{sup Fil}/--{sup Fil}).

  15. Sequence analysis of β-subunit genes of the 20S proteasome in patients with relapsed multiple myeloma treated with bortezomib or dexamethasone

    NARCIS (Netherlands)

    D.I. Lichter (David); H. Danaee (Hadi); M.D. Pickard (Michael); O. Tayber (Olga); M. Sintchak (Michael); H. Shi (Hongliang); P.G. Richardson (Paul Gerard); J. Cavenagh (Jamie); J. Bladé (Joan); T. Facon (Thierry); R. Niesvizky; M. Alsina (Melissa); W. Dalton (William); P. Sonneveld (Pieter); S. Lonial (Sagar); H. van de Velde (Helgi); D. Ricci (Deborah); D.-L. Esseltine (Dixie-Lee); W.L. Trepicchio (William); G. Mulligan (George); K.C. Anderson (Kenneth Carl)

    2012-01-01

    textabstractVariations within proteasome β (PSMB) genes, which encode the β subunits of the 20S proteasome, may affect proteasome function, assembly, and/or binding of proteasome inhibitors. To investigate the potential association between PSMB gene variants and treatment-emergent resistance to bort

  16. CLONING, SEQUENCING AND EXPRESSION STUDIES OF THE GENES ENCODING AMICYANIN AND THE BETA-SUBUNIT OF METHYLAMINE DEHYDROGENASE FROM THIOBACILLUS-VERSUTUS

    NARCIS (Netherlands)

    UBBINK, M; VANKLEEF, MAG; KLEINJAN, DJ; HOITINK, CWG; HUITEMA, F; BEINTEMA, JJ; DUINE, JA; CANTERS, GW

    1991-01-01

    The genes encoding amicyanin and the beta-subunit of methylamine dehydrogenase (MADH) from Thiobacillus versutus have been cloned and sequenced. The organization of these genes makes it likely that they are coordinately expressed and it supports earlier findings that the blue copper protein amicyani

  17. Alpha-synuclein gene deletion decreases brain palmitate uptake and alters the palmitate metabolism in the absence of alpha-synuclein palmitate binding

    DEFF Research Database (Denmark)

    Golovko, Mikhail Y; Færgeman, Nils J.; Cole, Nelson B;

    2005-01-01

    . To better define a role for alpha-synuclein in brain fatty acid uptake and metabolism, we infused awake, wild-type, or alpha-synuclein gene-ablated mice with [1-(14)C]palmitic acid (16:0) and assessed fatty acid uptake and turnover kinetics in brain phospholipids. Alpha-synuclein deficiency decreased brain......Alpha-synuclein is an abundant protein in the central nervous system that is associated with a number of neurodegenerative disorders, including Parkinson's disease. Its physiological function is poorly understood, although recently it was proposed to function as a fatty acid binding protein...... 16:0 uptake 35% and reduced its targeting to the organic fraction. The incorporation coefficient for 16:0 entering the brain acyl-CoA pool was significantly decreased 36% in alpha-synuclein gene-ablated mice. Because incorporation coefficients alone are not predictive of fatty acid turnover...

  18. Adaptive evolution after gene duplication in alpha-KT x 14 subfamily from Buthus martensii Karsch.

    Science.gov (United States)

    Cao, Zhijian; Mao, Xin; Xu, Xiuling; Sheng, Jiqun; Dai, Chao; Wu, Yingliang; Luo, Feng; Sha, Yonggang; Jiang, Dahe; Li, Wenxin

    2005-07-01

    A series of isoforms of alpha-KT x 14 (short chain potassium channel scorpion toxins) were isolated from the venom of Buthus martensii Karsch by RACE and screening cDNA library methods. These isoforms adding BmKK1--3 and BmSKTx1--2 together shared high homology (more than 97%) with each other. The result of genomic sequence analysis showed that a length 79 bp intron is inserted Ala codes between the first and the second base at the 17th amino acid of signal peptide. The introns of these isoforms also share high homology with those of BmKK2 and BmSKT x 1 reported previously. Sequence analysis of many clones of cDNA and genomic DNA showed that a species population or individual polymorphism of alpha-KT x 14 genes took place in scorpion Buthus martensii Karsch and accelerated evolution played an important role in the forming process of alpha-KT x 14 scorpion toxins subfamily. The result of southern hybridization indicated that alpha-KT x 14 toxin genes existed in scorpion chromosome with multicopies. All findings maybe provided an important evidence for an extensive evolutionary process of the scorpion "pharmacological factory": at the early course of evolution, the ancestor toxic gene duplicated into a series of multicopy genes integrated at the different chromosome; at the late course of evolution, subsequent functional divergence of duplicate genes was generated by mutations, deletions and insertion.

  19. Mouse mutants for the nicotinic acetylcholine receptor ß2 subunit display changes in cell adhesion and neurodegeneration response genes.

    Directory of Open Access Journals (Sweden)

    Carol M Rubin

    Full Text Available Mice lacking expression of the ß2 subunit of the neuronal nicotinic acetylcholine receptor (CHRNB2 display abnormal retinal waves and a dispersed projection of retinal ganglion cell (RGC axons to their dorsal lateral geniculate nuclei (dLGNs. Transcriptomes of LGN tissue from two independently generated Chrnb2-/- mutants and from wildtype mice were obtained at postnatal day 4 (P4, during the normal period of segregation of eye-specific afferents to the LGN. Microarray analysis reveals reduced expression of genes located on the cell membrane or in extracellular space, and of genes active in cell adhesion and calcium signaling. In particular, mRNA for cadherin 1 (Cdh1, a known axon growth regulator, is reduced to nearly undetectable levels in the LGN of P4 mutant mice and Lypd2 mRNA is similarly suppressed. Similar analysis of retinal tissue shows increased expression of crumbs 1 (Crb1 and chemokine (C-C motif ligand 21 (Ccl21 mRNAs in Chrnb2-/- mutant animals. Mutations in these genes are associated with retinal neuronal degeneration. The retinas of Chrnb2-/- mutants are normal in appearance, but the increased expression of these genes may also be involved in the abnormal projection patterns of RGC to the LGN. These data may provide the tools to distinguish the interplay between neural activity and molecular expression. Finally, comparison of the transcriptomes of the two different Chrnb2-/- mutant strains reveals the effects of genetic background upon gene expression.

  20. Transcritption regulation of soybean ribulose-1,5-bisphos-phate carboxylase small sub-unit gene by external factors

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Ribulose-1,5-bisphosphate carboxylase small subunit gene (rbcS) is present with multi-gene family in plant genome. In Glycine max, the rbcS polypeptide (EC4.1.1.39) is encoded by a gene family containing 4-8 members. Three full-length rbcS cDNA clones were isolated and characterized from soybean seedlings, and both of their nucleotide and amino acid sequences showed high similarity. Differential accumulation of the rbcS mRNA was observed among roots, hypocotyls, cotyledons, epicotyls and leaves. The rbcS genes were up-regulated by various external factors such as salicylic acid (SA), salt stress and drought stress. The expression level of rbcS genes after being treated by 2.0 mmol/L SA and 0.4% NaCl, respectively, is 2.5-3.0-fold as high as that of control sample. Moreover, soybean rbcS mRNA was accumulated with diurnal variation but easily influenced by light and low temperature.

  1. MOLECULAR CLONING AND HETEROLOGOUS EXPRESSION OF HUMAN INTERFERON ALPHA2b GENE

    Directory of Open Access Journals (Sweden)

    I. Made Artika

    2013-01-01

    Full Text Available Human alpha Interferons (hIFNα have been shown to have antiviral, antiproliferative and immunomodulatory activities. The human interferon alpha2b (hIFNα2b, is one of the human interferon alpha2 sub variants, naturally synthesized as a polypeptide of 188 amino acid residues, the first 23 residues of which represents a signal peptide. In the present study, the hIFNα2b gene was expressed after being fused with Glutathione S-Transferase (GST gene. The hIFNα2b gene was amplified from human genomic DNA by using a pair of specific primers, cloned into an Escherichia coli expression vector and expressed in E. coli cells under the direction of the tac promoter. The expressed protein was purified using a one-step affinity chromatography column containing immobilized gluthatione-bound resin. The purified protein was shown to react specifically with anti-human-interferon-alpha antibody, confirming that the protein was the human interferon alpha molecule. This strategy has the potential to be used as an alternative mean for production of pure human interferon α proteins for therapeutic purposes and for further studies on their molecular characterization and mechanism of action.

  2. Localization of eight additional genes in the human major histocompatibility complex, including the gene encoding the casein kinase II {beta} subunit (CSNK2B)

    Energy Technology Data Exchange (ETDEWEB)

    Albertella, M.R.; Jones, H.; Thomson, W. [Oxford Univ. (United Kingdom)] [and others

    1996-09-01

    A wide range of autoimmune and other diseases are known to be associated with the major histocompatibility complex. Many of these diseases are linked to the genes encoding the polymorphic histocompatibility complex. Many of these diseases are linked to the genes encoding the polymorphic histocompatibility antigens in the class I and class II regions, but some appear to be more strongly associated with genes in the central 1100-kb class III region, making it important to characterize this region fully for the presence of novel genes. An {approximately}220-kb segment of DNA in the class III region separating the Hsp70 (HSPA1L) and BAT1 (D6S8IE) genes, which was previously known to contain 14 genes. Genomic DNA fragments spanning the gaps between the known genes were used as probes to isolate cDNAs corresponding to five new genes within this region. Evidence from Northern blot analysis and exon trapping experiments that suggested the presence of at least two more new genes was also obtained. Partial cDNA and complete exonic genomic sequencing of one of the new genes has identified it as the casein kinase II{beta} subunit (CSNK2B). Two of the other novel genes lie within a region syntenic to that implicated in susceptibility to experimental allergic orchitis in the mouse, an autoimmune disease of the testis, and represent additional candidates for the Orch-1 locus associated with this disease. In addition, characterization of the 13-kb intergenic gap separating the RD (D6545) and G11 (D6S60E) genes has revealed the presence of a gene encoding a 1246-amino-acid polypeptide that shows significant sequence similarity to the yeast anti-viral Ski2p gene product. 49 refs., 8 figs.

  3. Evolution of human alpha 1-acid glycoprotein genes and surrounding Alu repeats.

    Science.gov (United States)

    Merritt, C M; Easteal, S; Board, P G

    1990-04-01

    There is a mosaic pattern of variation between the two tandemly arranged human alpha 1-acid glycoprotein genes. Both the synonymous and the nonsynonymous sites of exons 3 and 4 are more divergent than the rest of the gene, suggesting that they have had a different evolutionary history. Comparisons of the two gene sequences with rat AGP indicate that exons 3 and 4 of AGP2 have been evolving without functional constraint since their divergence from AGP1. It is proposed that the conserved region of the gene has been homogenized recently by gene conversion with the homologous regions of AGP1. The Alu sequences surrounding the genes appear to have been involved in both the gene duplication and the gene conversion events.

  4. Tumor necrosis factor alpha and alpha-1 antitrypsin gene variants in Serbian pediatric arterial ischemic stroke patients

    Directory of Open Access Journals (Sweden)

    Đorđević Valentina

    2013-01-01

    Full Text Available The etiology of arterial ischemic stroke (AIS in children is complex, and different from that in adults. Although rare, stroke in children is an important cause of mortality and morbidity. There is increasing evidence that genetic factors, including inflammation mediators, have a role in occurrence and outcome of stroke. We have chosen to assess the role of polymorphism -308G/A in the promoter of tumor necrosis factor α (TNFα gene and S and Z mutations in alpha 1-antitrypsin (AAT gene in the etiology of stroke in children. TNFα polymorphism affects plasma levels of this proinflamatory cytokine, and this could contribute to stroke pathology. It has been shown that increased AAT concentration may present a risk for AIS in children. Since S and Z mutations in AAT gene reduce its levels in plasma they could have a protective role in pediatric stroke. In this study twenty six children with AIS and 100 unrelated individuals from Serbian general population were investigated by PCR/RFLP for these gene variations. No statistically significant difference was observed between patients and general population in distribution of genotypes for -308G/A TNFα polymorphism, so its contributory role in the etiology of stroke was not evident in our group of patients. None of the tested AAT gene mutations were found in patients, which is in concordance with the proposed protective role of deficient AAT variants. AIS is a multifactorial disease, with many genes having a modest role in its pathophysiology, so further analyses of their combined effect are needed to elucidate genetic risk factors in the etiology and outcome of stroke in pediatric patients.

  5. Proteolytic processing of the L-type Ca2+ channel alpha11.2 subunit in neurons [version 1; referees: 2 approved

    Directory of Open Access Journals (Sweden)

    Olivia R. Buonarati

    2017-07-01

    Full Text Available Background: The L-type Ca2+ channel Cav1.2 is a prominent regulator of neuronal excitability, synaptic plasticity, and gene expression. The central element of Cav1.2 is the pore-forming α11.2 subunit. It exists in two major size forms, whose molecular masses have proven difficult to precisely determine. Recent work suggests that α11.2 is proteolytically cleaved between the second and third of its four pore-forming domains (Michailidis et al,. 2014. Methods: To better determine the apparent molecular masses (MRof the α11.2 size forms, extensive systematic immunoblotting of brain tissue as well as full length and C-terminally truncated α11.2 expressed in HEK293 cells was conducted using six different region–specific antibodies against α11.2. Results: The full length form of α11.2 migrated, as expected, with an apparent MR of ~250 kDa. A shorter form of comparable prevalence with an apparent MR of ~210 kDa could only be detected in immunoblots probed with antibodies recognizing α11.2 at an epitope 400 or more residues upstream of the C-terminus. Conclusions: The main two size forms of α11.2 are the full length form and a shorter form, which lacks ~350 distal C-terminal residues. Midchannel cleavage as suggested by Michailidis et al. (2014 is at best minimal in brain tissue.

  6. Construction and Expression of Eukaryotic Expression Vector of Mature Polypeptide of Duck Interferon Alpha Gene

    Institute of Scientific and Technical Information of China (English)

    PEI Fucheng; LI Jingpeng; LI Lu; ZHANG Jianguang; REN Guiping

    2006-01-01

    To study biological activities of Duck Interferon Alpha (DuIFN-α) and prepare antivirus medicine, the eukaryotic expression vector of mature polypeptide of Duck Interferon Alpha (mDuIFN-α) gene was constructed and expressed in insect cell. By means of PCR technique, the mDuIFN-α gene was cloned from pMD-18-duIFN-αrecombinant. The gene was then inserted to pGEM-T vector and identified by restriction endonuclease analysis and sequencing. The mDuIFN-α gene was ligated with the eukaryotic expression vector pMelBacA, then transfected into Sf9cell line. Recombinant polypeptide was effectively expressed in insect cell and its molecular weight was 34 ku.

  7. Association of tumor necrosis factor-alpha and interleukin-1 gene polymorphisms with silicosis

    Energy Technology Data Exchange (ETDEWEB)

    Yucesoy, B.; Vallyathan, V.; Landsittel, D.P.; Sharp, D.S.; Weston, A.; Burleson, G.R.; Simeonova, P.; McKinstry, M.; Luster, M.I. [NIOSH, Morgantown, WV (USA). Health Effects Laboratory Division

    2001-04-01

    Silicosis is manifested as a chronic inflammatory response leading to severe pulmonary fibrotic changes. Proinflammatory cytokines, such as TNF alpha and IL-1, produced in the lung by type II epithelial cells and alveolar macrophages, have been strongly implicated in the formation of these lesions. Recently, a number of single nucleotide polymorphisms (SNPs), which quantitatively affect mRNA synthesis, have been identified in the TNF alpha promoter and IL-1 gene cluster and their frequency is associated with certain chronic inflammatory diseases. To assess the role of these SNPs in silicosis, the authors examined their frequency in 325 ex-miners with moderate and severe silicosis and 164 miners with no lung disease. The odds ratio of disease for carriers of the minor variant, TNF alpha (-238), was markedly higher for severe silicosis (4.0) and significantly lower for moderate silicosis (0.52). Regardless of disease severity, the odds ratios of disease for carriers of the IL-1RA (+2018) or TNF alpha (-308) variants were elevated. There were no significant consistent differences in the distribution of the IL-1 alpha (+4845) or IL-1 beta (+3953) variants with respect to disease status. In addition, several significant gene-gene and gene-gene-environment interactions were observed. Different associations between moderate cases and controls versus severe cases and controls were also observed in a number of these multigene comparisons. These studies suggest that gene-environment interactions involving cytokine polymorphisms play a significant role in silicosis by modifying the extent of and susceptibility to disease.

  8. Overlapping elements in the guanylate-binding protein gene promoter mediate transcriptional induction by alpha and gamma interferons.

    OpenAIRE

    1991-01-01

    The gene encoding a 67-kDa cytoplasmic guanylate-binding protein (GBP) is transcriptionally induced in cells exposed to interferon of either type I (alpha interferon [IFN-alpha] or type II (IFN-gamma). The promoter of the GBP gene was cloned and found to contain an IFN-alpha-stimulated response element, which mediated the response of the GBP gene to IFN-alpha. On the basis of transfection experiments with recombinant plasmids, two different elements were delineated. Both were required to obta...

  9. The anxioselective agent 7-(2-chloropyridin-4-yl)pyrazolo-[1,5-a]-pyrimidin-3-yl](pyridin-2-yl)methanone (DOV 51892) is more efficacious than diazepam at enhancing GABA-gated currents at alpha1 subunit-containing GABAA receptors.

    Science.gov (United States)

    Popik, Piotr; Kostakis, Emmanuel; Krawczyk, Martyna; Nowak, Gabriel; Szewczyk, Bernadeta; Krieter, Philip; Chen, Zhengming; Russek, Shelley J; Gibbs, Terrell T; Farb, David H; Skolnick, Phil; Lippa, Arnold S; Basile, Anthony S

    2006-12-01

    Studies using mice with point mutations of GABA(A) receptor alpha subunits suggest that the sedative and anxiolytic properties of 1,4-benzodiazepines are mediated, respectively, by GABA(A) receptors bearing the alpha(1) and alpha(2) subunits. This hypothesis predicts that a compound with high efficacy at GABA(A) receptors containing the alpha(1) subunit would produce sedation, whereas an agonist acting at alpha(2) subunit-containing receptors (with low or null efficacy at alpha(1)-containing receptors) would be anxioselective. Electrophysiological studies using recombinant GABA(A) receptors expressed in Xenopus oocytes indicate that maximal potentiation of GABA-stimulated currents by the pyrazolo-[1,5-a]-pyrimidine, DOV 51892, at alpha(1)beta(2)gamma(2S) constructs of the GABA(A) receptor was significantly higher (148%) than diazepam. In contrast, DOV 51892 was considerably less efficacious and/or potent than diazepam in enhancing GABA-stimulated currents mediated by constructs containing alpha(2), alpha(3), or alpha(5) subunits. In vivo, DOV 51892 increased punished responding in the Vogel conflict test, an effect blocked by flumazenil, and increased the percentage of time spent in the open arms of the elevated plus-maze. However, DOV 51892 had no consistent effects on motor function or muscle relaxation at doses more than 1 order of magnitude greater than the minimal effective anxiolytic dose. Although the mutant mouse data predict that the high-efficacy potentiation of GABA(A1a) receptor-mediated currents by DOV 51892 would be sedating, behavioral studies demonstrate that DOV 51892 is anxioselective, indicating that GABA potentiation mediated by alpha(1) subunit-containing GABA(A) receptors may be neither the sole mechanism nor highly predictive of the sedative properties of benzodiazepine recognition site modulators.

  10. Sequencing and bacterial expression of a novel murine alpha interferon gene

    Institute of Scientific and Technical Information of China (English)

    王焱; 王征宇; 周鸣南; 蔡菊娥; 孙兰英; 刘新垣; B.L.Daugherty; S.Pestka

    1997-01-01

    A murine new alpha interferon gene (mIFN-αB) was found by primer-based sequencing method in a murine genomic DNA library. The gene was cloned and its sequence was determined. It was expressed in Escherichia coli under the control of the PL promoter which resulted in antiviral activity on mouse L-cells. The sequence of mlFN-αB has been accepted by GENEBANK.

  11. Modifier Genes for Mouse Phosphatidylinositol Transfer Protein alpha (vibrator) That Bypass Juvenile Lethality

    NARCIS (Netherlands)

    Concepcion, Dorothy; Johannes, Frank; Lo, Yuan Hung; Yao, Jay; Fong, Jerry; Hamilton, Bruce A.

    2011-01-01

    Phosphatidylinositol transfer proteins (PITPs) mediate lipid signaling and membrane trafficking in eukaryotic cells. Loss-of-function mutations of the gene encoding PITP alpha in mice result in a range of dosage-sensitive phenotypes, including neurological dysfunction, neurodegeneration, and prematu

  12. Estrogen-related receptor alpha modulates the expression of adipogenesis-related genes during adipocyte differentiation.

    Science.gov (United States)

    Ijichi, Nobuhiro; Ikeda, Kazuhiro; Horie-Inoue, Kuniko; Yagi, Ken; Okazaki, Yasushi; Inoue, Satoshi

    2007-07-06

    Estrogen-related receptor alpha (ERRalpha) is an orphan nuclear receptor that regulates cellular energy metabolism by modulating gene expression involved in fatty acid oxidation and mitochondrial biogenesis in brown adipose tissue. However, the physiological role of ERRalpha in adipogenesis and white adipose tissue development has not been well studied. Here, we show that ERRalpha and ERRalpha-related transcriptional coactivators, peroxisome proliferator-activated receptor gamma (PPARgamma) coactivator-1alpha (PGC-1alpha) and PGC-1beta, can be up-regulated in 3T3-L1 preadipocytes at mRNA levels under the adipogenic differentiation condition including the inducer of cAMP, glucocorticoid, and insulin. Gene knockdown by ERRalpha-specific siRNA results in mRNA down-regulation of fatty acid binding protein 4, PPARgamma, and PGC-1alpha in 3T3-L1 cells in the adipogenesis medium. ERRalpha and PGC-1beta mRNA expression can be also up-regulated in another preadipocyte lineage DFAT-D1 cells and a pluripotent mesenchymal cell line C3H10T1/2 under the differentiation condition. Furthermore, stable expression of ERRalpha in 3T3-L1 cells up-regulates adipogenic marker genes and promotes triglyceride accumulation during 3T3-L1 differentiation. These results suggest that ERRalpha may play a critical role in adipocyte differentiation by modulating the expression of various adipogenesis-related genes.

  13. Murine muscular dystrophy caused by a mutation in the laminin alpha 2 (Lama2) gene

    DEFF Research Database (Denmark)

    Xu, H; Wu, X R; Wewer, U M;

    1994-01-01

    The classic murine muscular dystrophy strain, dy, was first described almost 40 years ago. We have identified the molecular basis of an allele of dy, called dy2J, by detecting a mutation in the laminin alpha 2 chain gene--the first identified mutation in laminin-2. The G to A mutation in a splice...

  14. Targeted deletion of the mouse α2 nicotinic acetylcholine receptor subunit gene (Chrna2) potentiates nicotine-modulated behaviors.

    Science.gov (United States)

    Lotfipour, Shahrdad; Byun, Janet S; Leach, Prescott; Fowler, Christie D; Murphy, Niall P; Kenny, Paul J; Gould, Thomas J; Boulter, Jim

    2013-05-01

    Baseline and nicotine-modulated behaviors were assessed in mice harboring a null mutant allele of the nicotinic acetylcholine receptor (nAChR) subunit gene α2 (Chrna2). Homozygous Chrna2(-/-) mice are viable, show expected sex and Mendelian genotype ratios, and exhibit no gross neuroanatomical abnormalities. A broad range of behavioral tests designed to assess genotype-dependent effects on anxiety (elevated plus maze and light/dark box), motor coordination (narrow bean traverse and gait), and locomotor activity revealed no significant differences between mutant mice and age-matched wild-type littermates. Furthermore, a panel of tests measuring traits, such as body position, spontaneous activity, respiration, tremors, body tone, and startle response, revealed normal responses for Chrna2-null mutant mice. However, Chrna2(-/-) mice do exhibit a mild motor or coordination phenotype (a decreased latency to fall during the accelerating rotarod test) and possess an increased sensitivity to nicotine-induced analgesia in the hotplate assay. Relative to wild-type, Chrna2(-/-) mice show potentiated nicotine self-administration and withdrawal behaviors and exhibit a sex-dependent enhancement of nicotine-facilitated cued, but not trace or contextual, fear conditioning. Overall, our results suggest that loss of the mouse nAChR α2 subunit has very limited effects on baseline behavior but does lead to the potentiation of several nicotine-modulated behaviors.

  15. Preparation of Polyclonal Antibodies of Rubisco Large and Small Subunits and Their Application in the Functional Analysis of the Genes

    Institute of Scientific and Technical Information of China (English)

    Peng-Da MA; Tian-Cheng LU; Xiao-Fu ZHOU; Xiao-Juan ZHU; Xing-Zhi WANG

    2004-01-01

    Spinach Rubisco (ribulose-l,5-bisphosphate carboxylase/oxygenase) large (rbcL) and small (rbcS) subunits were separated by SDS-PAGE, and protein amount and purity were determined by Bradford assay. Polyclonal antibodies against rbcL and rbcS subunit were generated in female BALB/c mice and had no cross-reaction with each other. A total of 81 μg antigens were used and 0.3 ml anti-sera with titer of 1:5000were yielded. The antibodies were also applicable to study rbcL and rbcS in tobacco plant Nicotiana benthamiana. Potato virus X vector pGR107 induced silencing of rbcS gene by Agrobacterium in Nicotiana benthaniana was performed. The expression level ofrbcL and rbcS was lower in rbcS silenced plants than that in control plants as detected by the corresponding antibodies. This implied that the expression of rbcL was regulated by rbcS.

  16. Phylogenetic relationships between Vorticella convallaria and other species inferred from small subunit rRNA gene sequences.

    Science.gov (United States)

    Itabashi, Takeshi; Mikami, Kazuyuki; Fang, Jie; Asai, Hiroshi

    2002-08-01

    Vorticellid ciliates generally dwell in freshwater. In nature, the species have up until now been identified by comparison with previous descriptions. It is difficult to identify between species of the genus Vorticella, because the morphological markers of vorticellid ciliates described in reports are limited and variable. Unfortunately, culturing them has only succeeded with certain species such as Vorticella convallaria, but many others have been impossible to culture. To find out whether the sequence of a small subunit rRNA gene was an appropriate marker to identify vorticellid ciliates, the gene was aligned and compared. Finding a new convenient method will contribute to research on vorticellid ciliates. In strains of V. convallaria, classified morphologically, some varieties of the SSrRNA gene sequences were recognized, but there were large variations within the same species. According to the phylogenetic tree, these strains are closely related. However, the difference was not as big as between Vorticella and Carchesium. In addition, Carchesium constructed a distinct clade from the genus Vorticella and Epistylis. These results show the possibility that the SSrRNA gene is one of the important markers to identify species of Vorticella. This study is first to approach and clarify the complicated taxa in the genus Vorticella.

  17. Analysis of IL-12 p40 subunit gene and IFN-γ G5644A polymorphisms in Idiopathic Pulmonary Fibrosis

    Directory of Open Access Journals (Sweden)

    Welsh Kenneth I

    2003-06-01

    Full Text Available Abstract Background Genes encoding cytokine mediators are prime candidates for genetic analysis in conditions with T-helper (Th cell disease driven imbalance. Idiopathic Pulmonary Fibrosis (IPF is a predominantly Th2 mediated disease associated with a paucity of interferon-gamma (IFN-γ. The paucity of IFN-γ may favor the development of progressive fibrosis in IPF. Interleukin-12 (IL-12 plays a key role in inducing IFN-γ production. The aim of the current study was to assess whether the 1188 (A/C 3'UTR single nucleotide polymorphism (SNP in the IL-12 p40 subunit gene which was recently found to be functional and the 5644 (G/A 3' UTR SNP of the IFN-γ gene were associated with susceptibility to IPF. Methods We investigated the allelic distribution in these loci in UK white Caucasoid subjects comprising 73 patients with IPF and 157 healthy controls. The SNPs were determined using the polymerase chain reaction in association with sequence-specific primers incorporating mismatches at the 3'-end. Results Our results showed that these polymorphisms were distributed similarly in the IPF and control groups Conclusion We conclude that these two potentially important candidate gene single nucleotide polymorphisms are not associated with susceptibility to IPF.

  18. Modeling RNA polymerase competition: the effect of σ-subunit knockout and heat shock on gene transcription level

    Directory of Open Access Journals (Sweden)

    Seliverstov Alexandr V

    2011-01-01

    type of σ-subunit, the amount of transcription initiation aborts, etc. The model can be used to make functional predictions, e.g., heat shock response in isolated chloroplasts and changes of gene transcription levels under knockout of different σ-subunits or RNA polymerases or due to gene expression regulation. Reviewers This article was reviewed by Dr. Anthony Almudevar, Dr. Aniko Szabo, Dr. Yuri Wolf (nominated by Dr. Peter Olofsson and Prof. Marek Kimmel.

  19. The C. elegans nuclear receptor gene fax-1 and homeobox gene unc-42 coordinate interneuron identity by regulating the expression of glutamate receptor subunits and other neuron-specific genes.

    Science.gov (United States)

    Wightman, Bruce; Ebert, Bryan; Carmean, Nicole; Weber, Katherine; Clever, Sheila

    2005-11-01

    The fax-1 gene of the nematode C. elegans encodes a conserved nuclear receptor that is the ortholog of the human PNR gene and functions in the specification of neuron identities. Mutations in fax-1 result in locomotion defects. FAX-1 protein accumulates in the nuclei of 18 neurons, among them the AVA, AVB, and AVE interneuron pairs that coordinate body movements. The identities of AVA and AVE interneurons are defective in fax-1 mutants; neither neuron expresses the NMDA receptor subunits nmr-1 and nmr-2. Other ionotropic glutamate receptor subunits are expressed normally in the AVA and AVE neurons. The unc-42 homeobox gene also regulates AVA and AVE identity; however, unc-42 mutants display the complementary phenotype: NMDA receptor subunit expression is normal, but some non-NMDA glutamate receptor subunits are not expressed. These observations support a combinatorial role for fax-1 and unc-42 in specifying AVA and AVE identity. However, in four other neuron types, fax-1 is regulated by unc-42, and both transcriptional regulators function in the regulation of the opt-3 gene in the AVE neurons and the flp-1 and ncs-1 genes in the AVK neurons. Therefore, while fax-1 and unc-42 act in complementary parallel pathways in some cells, they function in overlapping or linear pathways in other cellular contexts, suggesting that combinatorial relationships among transcriptional regulators are complex and cannot be generalized from one neuron type to another.

  20. A critical role for the S4-S5 intracellular loop in domain IV of the sodium channel alpha-subunit in fast inactivation.

    Science.gov (United States)

    McPhee, J C; Ragsdale, D S; Scheuer, T; Catterall, W A

    1998-01-09

    Na+ channel fast inactivation is thought to involve the closure of an intracellular inactivation gate over the channel pore. Previous studies have implicated the intracellular loop connecting domains III and IV and a critical IFM motif within it as the inactivation gate, but amino acid residues at the intracellular mouth of the pore required for gate closure and binding have not been positively identified. The short intracellular loops connecting the S4 and S5 segments in each domain of the Na+ channel alpha-subunit are good candidates for this role in the Na+ channel inactivation process. In this study, we used scanning mutagenesis to examine the role of the IVS4-S5 region in fast inactivation. Mutations F1651A, near the middle of the loop, and L1660A and N1662A, near the COOH-terminal end, substantially disrupted Na+ channel fast inactivation. The mutant F1651A conducted Na+ currents that decayed very slowly, while L1660A and N1662A had large sustained Na+ currents at the end of 30-ms depolarizing pulses. Inactivation of macroscopic Na+ currents was nearly abolished by the N1662A mutation and the combination of the F1651A/L1660A mutations. Single channel analysis revealed frequent reopenings for all three mutants during 40-ms depolarizing pulses, indicating a substantial impairment of the stability of the inactivated state compared with wild type (WT). The F1651A and N1662A mutants also had increased mean open times relative to WT, indicating a slowed rate of entry into the inactivated state. In addition to these effects on inactivation of open Na+ channels, mutants F1651A, L1660A, and N1662A also impaired fast inactivation of closed Na+ channels, as assessed from measurements of the maximum open probability of single channels. The peptide KIFMK mimics the IFM motif of the inactivation gate and provides a test of the effect of mutations on the hydrophobic interaction of this motif with the inactivation gate receptor. KIFMK restores fast inactivation of open

  1. Functional and molecular plasticity of gamma and alpha-1 GABAA receptor subunits in the dorsal motor nucleus of the vagus after experimentally-induced diabetes.

    Science.gov (United States)

    Boychuk, Carie R; Smith, Katalin Cs; Smith, Bret N

    2017-08-23

    Chronic experimentally-induced hyperglycemia augments subunit specific gamma-aminobutyric acid A (GABAA) receptor-mediated inhibition of parasympathetic preganglionic motor neurons in the dorsal motor nucleus of the vagus (DMV). However, the contribution of α1 or γ GABAA receptor subunits, which are ubiquitously expressed on central nervous system neurons, to this elevation in inhibitory tone have not been determined. This study investigated the effect of chronic hyperglycemia/hypoinsulinemia on α1- and γ-subunit specific GABAA receptor-mediated inhibition using electrophysiological recordings in vitro and quantitative (q)RT-PCR. DMV neurons from streptozotocin-treated mice demonstrated enhancement of both phasic and tonic inhibitory currents in response to application of the α1-subunit selective GABAA receptor positive allosteric modulator, zolpidem. Responses to low concentrations of the GABAA receptor antagonist, gabazine suggested an additional increased contribution of γ-subunit-containing receptors to tonic currents in DMV neurons. Consistent with the functional elevation in α1- and γ-subunit-dependent activity, transcription of both the α1- and γ2-subunits was increased in the dorsal vagal complex of streptozotocin-treated mice. Overall these findings suggest an increased sensitivity to both zolpidem and gabazine after several days of hyperglycemia/hypoinsulinemia, which could contribute to altered parasympathetic output from DMV neurons in diabetes. Copyright © 2017, Journal of Neurophysiology.

  2. Alpha-synuclein gene structure,evolution,and protein aggregation

    Institute of Scientific and Technical Information of China (English)

    Lili Xiong; Peng Zhao; Zhiyun Guo; Jianhua Zhang; Diqiang Li; Canquan Mao

    2010-01-01

    α-synuclein,a member of the synuclein family,is predominately expressed in brain tissues,where it is the major component of Lewy bodies,the major hallmark of Parkinson's disease.We analyzed the phylogenetics,gene structure,and effects of different forms of α-synuclein on in vitro protein aggregation.The synuclein phylogenetic tree showed that sequences could be classified into α,β,and γ protein groups.The orthologous gene α-,β-and γ-synuclein showed similar evolutionary distance to the paralogous gene α-,β-and γ-synuclein.Bioinformatics analysis suggests that the amino-acid sequence of human α-synuclein can be divided into three regions: N-terminal amphipathic region(1-60),central hydrophobic non-amyloid beta component segment(61-95),and the C-terminal acidic part(96-140).The mutant site of A30P is at the second exon of α-synuclein,whereas E46K is located at the third exon of α-synuclein.α-synuclein alternative splicing results in four isomers,and five exons,all of which participate in protein coding,comprising 140 amino acids to produce the major α-synuclein in vivo.The threeα-synuclein isoforms are products of alternative splicing,α-synuclein 126,112 and 98.We also review the genetic and cellular factors that affect the aggregation of α-synuclein and compounds that inhibit aggregation.A better understanding of α-synuclein sequences,structure,and function may allow better targeted therapy and diagnosis of α-synuclein in Parkinson's disease and other neurodegenerative diseases.

  3. Molecular phylogeny of silk-producing insects based on 16S ribosomal RNA and cytochrome oxidase subunit I genes

    Indian Academy of Sciences (India)

    B. Mahendran; S. K. Ghosh; S. C. Kundu

    2006-04-01

    We have examined the molecular-phylogenetic relationships between nonmulberry and mulberry silkwormspecies that belong to the families Saturniidae, Bombycidae and Lasiocampidae using 16S ribosomal RNA (16S rRNA) and cytochrome oxidase subunit I (coxI) gene sequences. Aligned nucleotide sequences of 16S rRNA and coxI from 14 silk-producing species were used for construction of phylogenetic trees by maximum likelihood and maximum parsimony methods. The tree topology on the basis of 16S rRNA supports monophyly for members of Saturniidae and Bombycidae. Weighted parsimony analysis weighted towards transversions relative to transitions (ts, tv4) for coxI resulted in more robust bootstrap support over unweighted parsimony and favours the 16S rRNA tree topology. Combined analysis reflected clear biogeographic pattern, and agrees with morphological and cytological data.

  4. IDENTIFICATION OF POLYMORPHISM OF FSH BETA-SUBUNIT GENE AS SPERM QUALITY MARKER IN BALI CATTLE USING PCR-RFLP

    Directory of Open Access Journals (Sweden)

    A.B.L. Ishak

    2014-10-01

    Full Text Available The aim of study was to identify the association of FSH beta-subunit gene polymorphisms withsperm quality traits. A total of 470 samples of normal mature bull from several breeds were used forpopulation study and 127 bulls from National and Regional AI centre of Indonesia for association study.To amplify, a PCR-RFLP method was used and digested with Pst1 restriction enzyme. The allelefrequency of the A and B in Bali cattle were (0.000 and (1.000, respectively. The absence of otherallele A suggested that the Bali cattle was monomorphic, while Brahman, FH, Simmental and Limousinewere polymorphic. The highest observed heterozygosity were found in Limousine (0.318 and thehighest expected heterozygosity were in Simmental (0.420. The higher incident of percentage of spermabnormalities were found in Simmental, Limousin, Brahman compared to Bali and FH. Among all typesof sperm abnormalities, the abaxial and microcephalus were found in highest number.

  5. Phylogenetic position of Dysteria derouxi (Ciliophora:Phyllopharyngea: Dysteriida) inferred from the small subunit ribosomal RNA gene sequence

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The complete small subunit rRNA (SSrRNA) gene sequence of a marine ciliate, Dysteria derouxi Gong and Song, 2004, was determined to be of 1 708 nucleotides. The phylogenetic position of this species within the class Phyllopharyngea was deduced using distance matrix, maximum parsimony and maximum likelihood methods. Dysteria derouxi, together with other available ciliates of the class Phyllopharyngea, forms a monophyletic clade with strong bootstrap support in the distance matrix, maximum parsimony and likelihood tree construction methods, while the dysterids are, as a monophyletic group, phylogenetically close to the clade of chlamydodontids [values of 100% LS(least-squares), 100% NJ(neighbor-joining)]. In addition, the trees indicate that dysteriids may be a higher or specialized group within the class, which corresponds well to the morphology and infraciliature.

  6. Mitochondrial bioenergetics and redox state are unaltered in Trypanosoma cruzi isolates with compromised mitochondrial complex I subunit genes.

    Science.gov (United States)

    Carranza, Julio César; Kowaltowski, Alicia J; Mendonça, Marco Aurélio G; de Oliveira, Thays C; Gadelha, Fernanda R; Zingales, Bianca

    2009-06-01

    In trypanosomatids the involvement of mitochondrial complex I in NADH oxidation has long been debated. Here, we took advantage of natural Trypanosoma cruzi mutants which present conspicuous deletions in ND4, ND5 and ND7 genes coding for complex I subunits to further investigate its functionality. Mitochondrial bioenergetics of wild type and complex I mutants showed no significant differences in oxygen consumption or respiratory control ratios in the presence of NADH-linked substrates or FADH(2)-generating succinate. No correlation could be established between mitochondrial membrane potentials and ND deletions. Since release of reactive oxygen species occurs at complex I, we measured mitochondrial H(2)O(2) formation induced by different substrates. Significant differences not associated to ND deletions were observed among the parasite isolates, demonstrating that these mutations are not important for the control of oxidant production. Our data support the notion that complex I has a limited function in T. cruzi.

  7. Phylogenetic position of three Condylostoma species(Protozoa,Ciliophora,Heterotricheal inferred from the small subunit rRNA gene sequence

    Institute of Scientific and Technical Information of China (English)

    Wenbo Guo; Shan Gao; Weibo Song; Khaled A.S.A1-Rasheid; Chen Shao; Miao Miao; Saleh A.A1-Farraj; Saleh A.A1-Qurishy; Zigui Chen; Zhenzhen Yi

    2008-01-01

    The systematically poorly known ciliate genus Conadylostoma was erected by Vincent in 1826.About 10 morphotypes have been reported,but any molecular investigations concerning this group SO far are lacking.In this work,the small subunit ribosomal RNA (SS rRNA)gene of three marine Conaylostoma species was sequenced,by which the phylogenetic trees were constructed by distance-matrix,maximum parsimony and Bayesian inference methods.The results show that(1)all the trees have similar topologies with high supports;(2)Condylostoma is mostly related to the genus Condylostentor;and(3)three Condylostoma species as well as Conadylostentor auriculatus cluster together and form a sister group with other heterotrichs.This is moderately consistent with the assessment of phylo-genetic relationships of Conaylostoma-related heterotrichs from the morphological information.The phylogenetic relationship of some other related heterotrichs,Peritromus,Fotlictllina,Stentor and Blepharisma,has been also discussed.

  8. Functional characterization of the promoter for the mouse SPTLC2 gene, which encodes subunit 2 of serine palmitoyltransferase

    Science.gov (United States)

    Linn, Stephen C.; Andras, Lindsay M.; Kim, Hee-Sook; Wei, Jia; Nagiec, M. Marek; Dickson, Robert C.; Merrill, Alfred H.

    2006-01-01

    A series of luciferase reporter constructs was prepared from a 1035-bp fragment of mouse genomic DNA flanking the 5′ -coding sequence for the SPTLC2 subunit of serine palmitoyltransferase, the initial enzyme of de novo sphingolipid biosynthesis. The full-length DNA fragment promoted strong reporter gene expression in NIH3T3 cells while deletion and site-directed mutagenesis indicated that the proximal 335 bp contain initiator and downstream promoter elements, two proximal GC boxes that appear to stimulate transcription in a cooperative manner, and several additional elements whose activity cannot be accounted for by known factor binding sites. These findings provide insight into the control mechanisms for transcription of mammalian SPTLC2. PMID:17070807

  9. Identification of a new human mtDNA polymorphism (A14290G in the NADH dehydrogenase subunit 6 gene

    Directory of Open Access Journals (Sweden)

    M. Houshmand

    2006-06-01

    Full Text Available Leber's hereditary optic neuropathy (LHON is a maternally inherited form of retinal ganglion cell degeneration leading to optic atrophy in young adults. Several mutations in different genes can cause LHON (heterogeneity. The ND6 gene is one of the mitochondrial genes that encodes subunit 6 of complex I of the respiratory chain. This gene is a hot spot gene. Fourteen Persian LHON patients were analyzed with single-strand conformational polymorphism and DNA sequencing techniques. None of these patients had four primary mutations, G3460A, G11788A, T14484C, and G14459A, related to this disease. We identified twelve nucleotide substitutions, G13702C, T13879C, T14110C, C14167T, G14199T, A14233G, G14272C, A14290G, G14365C, G14368C, T14766C, and T14798C. Eleven of twelve nucleotide substitutions had already been reported as polymorphism. One of the nucleotide substitutions (A14290G has not been reported. The A14290G nucleotide substitution does not change its amino acid (glutamic acid. We looked for base conservation using DNA star software (MEGALIGN program as a criterion for pathogenic or nonpathogenic nucleotide substitution in A14290G. The results of ND6 gene alignment in humans and in other species (mouse, cow, elegans worm, and Neurospora crassa mold revealed that the 14290th base was not conserved. Fifty normal controls were also investigated for this polymorphism in the Iranian population and two had A14290G polymorphism (4%. This study provides evidence that the mtDNA A14290G allele is a new nonpathogenic polymorphism. We suggest follow-up studies regarding this polymorphism in different populations.

  10. The RFC2 gene encoding a subunit of replication factor C of Saccharomyces cerevisiae.

    OpenAIRE

    Noskov, V; Maki, S.; Kawasaki, Y.; Leem, S H; Ono, B; Araki, H; Pavlov, Y; Sugino, A

    1994-01-01

    Replication Factor C (RF-C) of Saccharomyces cerevisiae is a complex that consists of several different polypeptides ranging from 120- to 37 kDa (Yoder and Burgers, 1991; Fien and Stillman, 1992), similar to human RF-C. We have isolated a gene, RFC2, that appears to be a component of the yeast RF-C. The RFC2 gene is located on chromosome X of S. cerevisiae and is essential for cell growth. Disruption of the RFC2 gene led to a dumbbell-shaped terminal morphology, common to mutants having a def...

  11. laminin alpha 1 gene is essential for normal lens development in zebrafish

    Directory of Open Access Journals (Sweden)

    Bosenko Dmitry V

    2006-03-01

    Full Text Available Abstract Background Laminins represent major components of basement membranes and play various roles in embryonic and adult tissues. The functional laminin molecule consists of three chains, alpha, beta and gamma, encoded by separate genes. There are twelve different laminin genes identified in mammals to date that are highly homologous in their sequence but different in their tissue distribution. The laminin alpha -1 gene was shown to have the most restricted expression pattern with strong expression in ocular structures, particularly in the developing and mature lens. Results We identified the zebrafish lama1 gene encoding a 3075-amino acid protein (lama1 that possesses strong identity with the human LAMA1. Zebrafish lama1 transcripts were detected at all stages of embryo development with the highest levels of expression in the developing lens, somites, nervous and urogenital systems. Translation of the lama1 gene was inhibited using two non-overlapping morpholino oligomers that were complementary to sequences surrounding translation initiation. Morphant embryos exhibited an arrest in lens development and abnormalities in the body axis length and curvature. Conclusion These results underline the importance of the laminin alpha 1 for normal ocular development and provide a basis for further analysis of its developmental roles.

  12. Itai-itai disease is not associated with polymorphisms of the estrogen receptor {alpha} gene

    Energy Technology Data Exchange (ETDEWEB)

    Nishio, Hisahide; Hayashi, Chiyo; Lee, Myeongjin; Ayaki, Hitoshi; Sumino, Kimiaki [Kobe Univ. School of Medicine (Japan). Dept. of Public Health; Yamamoto, Ryoji; Ninomiya, Ruriko; Koizumi, Naoko [Hyogo College of Medicine (Japan). Dept. of Public Health

    1999-11-01

    Itai-itai (or ouch-ouch) disease is a syndrome accompanied by bone mineral disorders, and which may be related to oral cadmium exposure. Itai-itai predominantly affects postmenopausal women with a history of multiple childbirths. Recently, it has been reported that polymorphisms of the estrogen receptor {alpha} (ER{alpha}) gene are associated with postmenopausal reduction of bone mineral density in Japanese women. However, estrogen receptors have never been studied in itai-itai disease. In this study, we examined the genotypic distributions of PvuII and XbaI restriction fragment length polymorphisms (RFLPs) of the ER{alpha} gene in patients with itai-itai disease and compared them with those of control subjects. The RFLPs are represented here as P{sub p} (PvuII) and Xx (XbaI); the capital and small letters signify the absence and presence of restriction sites, respectively. The genotypic distributions of the patient group were: PP, 14.8%; Pp, 55.6%; pp, 29.6%; XX, 7.4%; Xx, 29.6%; and xx, 63.0%. These distributions were similar to those observed for the control groups, hence no pattern of genotypic distribution was observed that could be related to itai-itai disease. We conclude that RFLPs of the ER{alpha} gene may not be associated with itai-itai disease. (orig.)

  13. Inhibin alpha gene G769A mutation in Chinese women with premature ovarian failure

    Institute of Scientific and Technical Information of China (English)

    Chen Xin-na; Chen Gui-an; Li Mei-zhi

    2006-01-01

    Objective: To examine whether the inhibin alpha (INHα) gene G769A mutation is present in Chinese women with idiopathic premature ovarian failure (POF). Methods: The study was carried out in 77 Chinese women with idiopathic POF and 35 normal controls(including 25 normal females with a regular menstrual history and 10 normal post-menopause women)by a case-control analysis. Genomic DNA was extracted from the peripheral blood of the patients and control subjects. The inhibin alpha gene was amplified by PCR. The PCR products were subsequently digested with enzyme BbvI, and then were subjected to electrophoresis on agarose gels and stained with ethidium bromide to determine the INHα G769A mutation. Results:With BbvI digestion three fragments of 130, 88 and 25 base pairs were noted for all 77 POF patiens and 35 controls, thus demonstrating normal inhibin alpha allele. No patient or control was heterozygous or homozygous for the mutant allele. Conclusions: The inhibin alpha gene mutation may be rare in Chinese women with POF. The etiology of idiopathic POF for most patients deserves further investigation.

  14. Is type I alpha 2 collagen gene responsible for intracranial aneurysm in Northeast China?

    Institute of Scientific and Technical Information of China (English)

    Pengfei Wu; Bo Li; Anhua Wu; Yunjie Wang

    2013-01-01

    In this study, we investigated whether a single nucleotide polymorphism (rs42524 G > C) in the type I alpha 2 collagen gene was associated with sporadic ruptured intracranial aneurysm or its clinical characteristics in patients from Northeast China. Genotyping of the rs42524 G > C polymorphism was carried out using a polymerase chain reaction-restriction fragment length polymorphism assay. The data showed that the frequency of the rs42524 GC + CC genotype was significantly higher than the GG genotype among intracranial aneurysm patients whose Hunt and Hess grading scale was > 3. In addition, the rs42524 G > C genotype was found to have a statistically significant association with intracranial aneurysm risk. These findings indicate that the type I alpha 2 collagen gene gene may be involved in a predisposition to intracranial aneurysm in the Northeast Chinese population. Crucially, the rs42524 C allele may be an important risk factor for increased severity of the condition in patients with ruptured intracranial aneurysms.

  15. The Vacuolar ATPase from Entamoeba histolytica: Molecular cloning of the gene encoding for the B subunit and subcellular localization of the protein

    Directory of Open Access Journals (Sweden)

    Luna-Arias Juan

    2008-12-01

    Full Text Available Abstract Background Entamoeba histolytica is a professional phagocytic cell where the vacuolar ATPase plays a key role. This enzyme is a multisubunit complex that regulates pH in many subcellular compartments, even in those that are not measurably acidic. It participates in a wide variety of cellular processes such as endocytosis, intracellular transport and membrane fusion. The presence of a vacuolar type H+-ATPase in E. histolytica trophozoites has been inferred previously from inhibition assays of its activity, the isolation of the Ehvma1 and Ehvma3 genes, and by proteomic analysis of purified phagosomes. Results We report the isolation and characterization of the Ehvma2 gene, which encodes for the subunit B of the vacuolar ATPase. This polypeptide is a 55.3 kDa highly conserved protein with 34 to 80% identity to orthologous proteins from other species. Particularly, in silico studies showed that EhV-ATPase subunit B displays 78% identity and 90% similarity to its Dictyostelium ortholog. A 462 bp DNA fragment of the Ehvma2 gene was expressed in bacteria and recombinant polypeptide was used to raise mouse polyclonal antibodies. EhV-ATPase subunit B antibodies detected a 55 kDa band in whole cell extracts and in an enriched fraction of DNA-containing organelles named EhkOs. The V-ATPase subunit B was located by immunofluorescence and confocal microscopy in many vesicles, in phagosomes, plasma membrane and in EhkOs. We also identified the genes encoding for the majority of the V-ATPase subunits in the E. histolytica genome, and proposed a putative model for this proton pump. Conclusion We have isolated the Ehvma2 gene which encodes for the V-ATPase subunit B from the E. histolytica clone A. This gene has a 154 bp intron and encodes for a highly conserved polypeptide. Specific antibodies localized EhV-ATPase subunit B in many vesicles, phagosomes, plasma membrane and in EhkOs. Most of the orthologous genes encoding for the EhV-ATPase subunits

  16. Alpha-amylase inhibitor-1 gene from Phaseolus vulgaris expressed in Coffea arabica plants inhibits alpha-amylases from the coffee berry borer pest.

    Science.gov (United States)

    Barbosa, Aulus E A D; Albuquerque, Erika V S; Silva, Maria C M; Souza, Djair S L; Oliveira-Neto, Osmundo B; Valencia, Arnubio; Rocha, Thales L; Grossi-de-Sa, Maria F

    2010-06-17

    Coffee is an important crop and is crucial to the economy of many developing countries, generating around US$70 billion per year. There are 115 species in the Coffea genus, but only two, C. arabica and C. canephora, are commercially cultivated. Coffee plants are attacked by many pathogens and insect-pests, which affect not only the production of coffee but also its grain quality, reducing the commercial value of the product. The main insect-pest, the coffee berry borer (Hypotheneumus hampei), is responsible for worldwide annual losses of around US$500 million. The coffee berry borer exclusively damages the coffee berries, and it is mainly controlled by organochlorine insecticides that are both toxic and carcinogenic. Unfortunately, natural resistance in the genus Coffea to H. hampei has not been documented. To overcome these problems, biotechnological strategies can be used to introduce an alpha-amylase inhibitor gene (alpha-AI1), which confers resistance against the coffee berry borer insect-pest, into C. arabica plants. We transformed C. arabica with the alpha-amylase inhibitor-1 gene (alpha-AI1) from the common bean, Phaseolus vulgaris, under control of the seed-specific phytohemagglutinin promoter (PHA-L). The presence of the alpha-AI1 gene in six regenerated transgenic T1 coffee plants was identified by PCR and Southern blotting. Immunoblotting and ELISA experiments using antibodies against alpha-AI1 inhibitor showed a maximum alpha-AI1 concentration of 0.29% in crude seed extracts. Inhibitory in vitro assays of the alpha-AI1 protein against H. hampei alpha-amylases in transgenic seed extracts showed up to 88% inhibition of enzyme activity. This is the first report showing the production of transgenic coffee plants with the biotechnological potential to control the coffee berry borer, the most important insect-pest of crop coffee.

  17. Glycine activated ion channel subunits encoded by ctenophore glutamate receptor genes.

    Science.gov (United States)

    Alberstein, Robert; Grey, Richard; Zimmet, Austin; Simmons, David K; Mayer, Mark L

    2015-11-03

    Recent genome projects for ctenophores have revealed the presence of numerous ionotropic glutamate receptors (iGluRs) in Mnemiopsis leidyi and Pleurobrachia bachei, among our earliest metazoan ancestors. Sequence alignments and phylogenetic analysis show that these form a distinct clade from the well-characterized AMPA, kainate, and NMDA iGluR subtypes found in vertebrates. Although annotated as glutamate and kainate receptors, crystal structures of the ML032222a and PbiGluR3 ligand-binding domains (LBDs) reveal endogenous glycine in the binding pocket, whereas ligand-binding assays show that glycine binds with nanomolar affinity; biochemical assays and structural analysis establish that glutamate is occluded from the binding cavity. Further analysis reveals ctenophore-specific features, such as an interdomain Arg-Glu salt bridge, present only in subunits that bind glycine, but also a conserved disulfide in loop 1 of the LBD that is found in all vertebrate NMDA but not AMPA or kainate receptors. We hypothesize that ctenophore iGluRs are related to an early ancestor of NMDA receptors, suggesting a common evolutionary path for ctenophores and bilaterian species, and suggest that future work should consider both glycine and glutamate as candidate neurotransmitters in ctenophore species.

  18. A linkage study between the GABAA beta2 and GABAA gamma2 subunit genes and major psychoses.

    Science.gov (United States)

    Ambrósio, Alda M; Kennedy, James L; Macciardi, Fabio; King, Nicole; Azevedo, Maria H; Oliveira, Catarina R; Pato, Carlos N

    2005-01-01

    Alterations of the gamma-aminobutyric acid (GABA) system have been implicated in the pathophysiology of major psychoses. Restriction fragment length polymorphisms associated with the human gamma-aminobutyric acid type A (GABAA) beta2 and GABAA gamma2 subunit genes on chromosome 5q32-q35 were tested to determine whether they confer susceptibility to major psychoses. Thirty-two schizophrenic families and 25 bipolar families were tested for linkage. Nonparametric linkage (NPL) analysis performed by GENEHUNTER showed no significant NPL scores for both genes in schizophrenia (GABAA beta2: NPL narrow= -0.450; NPL broad= -0.808; GABAA gamma2: NPL narrow=0.177; NPL broad= -0.051) or bipolar disorder (GABAA beta2: NPL narrow=0.834; NPL broad=0.783; GABAA gamma2: NPL narrow= -0.159; NPL broad=0.070). Linkage analysis does not support the hypothesis that variants within the GABAA beta2 and GABAA gamma2 genes are significantly linked to major psychoses in a Portuguese population.

  19. Detection of the enzymatically-active polyhydroxyalkanoate synthase subunit gene, phaC, in cyanobacteria via colony PCR.

    Science.gov (United States)

    Lane, Courtney E; Benton, Michael G

    2015-12-01

    A colony PCR-based assay was developed to rapidly determine if a cyanobacterium of interest contains the requisite genetic material, the PHA synthase PhaC subunit, to produce polyhydroxyalkanoates (PHAs). The test is both high throughput and robust, owing to an extensive sequence analysis of cyanobacteria PHA synthases. The assay uses a single detection primer set and a single reaction condition across multiple cyanobacteria strains to produce an easily detectable positive result - amplification via PCR as evidenced by a band in electrophoresis. In order to demonstrate the potential of the presence of phaC as an indicator of a cyanobacteria's PHA accumulation capabilities, the ability to produce PHA was assessed for five cyanobacteria with a traditional in vivo PHA granule staining using an oxazine dye. The confirmed in vivo staining results were then compared to the PCR-based assay results and found to be in agreement. The colony PCR assay was capable of successfully detecting the phaC gene in all six of the diverse cyanobacteria tested which possessed the gene, while exhibiting no undesired product formation across the nine total cyanobacteria strains tested. The colony PCR quick prep provides sufficient usable DNA template such that this assay could be readily expanded to assess multiple genes of interest simultaneously.

  20. Mediator subunit MED1 is a T3-dependent and T3-independent coactivator on the thyrotropin β gene promoter

    Energy Technology Data Exchange (ETDEWEB)

    Matsui, Keiji; Oda, Kasumi; Mizuta, Shumpei; Ishino, Ruri; Urahama, Norinaga; Hasegawa, Natsumi [Laboratory of Hematology, Division of Medical Biophysics, Kobe University Graduate School of Health Sciences, 7-10-2 Tomogaoka, Suma-ku, Kobe 654-0142 (Japan); Roeder, Robert G. [Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065 (United States); Ito, Mitsuhiro, E-mail: itomi@med.kobe-u.ac.jp [Laboratory of Hematology, Division of Medical Biophysics, Kobe University Graduate School of Health Sciences, 7-10-2 Tomogaoka, Suma-ku, Kobe 654-0142 (Japan); Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065 (United States); Department of Family and Community Medicine, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 654-0142 (Japan); Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 159-8555 (Japan)

    2013-10-11

    Highlights: •MED1 is a bona fide T3-dependent coactivator on TSHB promoter. •Mice with LxxLL-mutant MED1 have attenuated TSHβ mRNA and thyroid hormone levels. •MED1 activates TSHB promoter T3-dependently in cultured cells. •T3-dependent MED1 action is enhanced when SRC1/SRC2 or HDAC2 is downregulated. •MED1 is also a T3-independent GATA2/Pit1 coactivator on TSHB promoter. -- Abstract: The MED1 subunit of the Mediator transcriptional coregulator complex is a nuclear receptor-specific coactivator. A negative feedback mechanism of thyroid-stimulating hormone (TSH, or thyrotropin) expression in the thyrotroph in the presence of triiodothyronine (T3) is employed by liganded thyroid hormone receptor β (TRβ) on the TSHβ gene promoter, where conventional histone-modifying coactivators act as corepressors. We now provide evidence that MED1 is a ligand-dependent positive cofactor on this promoter. TSHβ gene transcription was attenuated in MED1 mutant mice in which the nuclear receptor-binding ability of MED1 was specifically disrupted. MED1 stimulated GATA2- and Pit1-mediated TSHβ gene promoter activity in a ligand-independent manner in cultured cells. MED1 also stimulated transcription from the TSHβ gene promoter in a T3-dependent manner. The transcription was further enhanced when the T3-dependent corepressors SRC1, SRC2, and HDAC2 were downregulated. Hence, MED1 is a T3-dependent and -independent coactivator on the TSHβ gene promoter.

  1. Design of a molecular method for subspecies specific identification of Klebsiella pneumoniae by using the 16S ribosomal subunit gene

    Directory of Open Access Journals (Sweden)

    Nelson Enrique Arenas

    2009-12-01

    Full Text Available Introduction: Rhinoscleroma is caused by Klebsiella pneumoniae subsp. rhinoscleromatis and the ozena infections caused by K. pneumoniae subsp. ozaenae, both infections affect the upper respiratory tract. In the first clinical phases the symptoms are unspecific, and the disease can be misdiagnosed as a common cold, therefore antimicrobial therapy cannot reach effective results and patients must be following up for several years since the infection became chronic. Objective: To identify Klebsiella subspecies using a specific assay based on amplicons restriction of a gene which encodes 16S subunit ribosomal (rDNA16S. Methodology: Specific restriction patterns were generated; using reported sequences from rDNA16S gene and bioinformatics programs MACAW, PFE, GENEDOC and GENE RUNNER. Amplification and restriction assays were standardized. Results: Predictions in silico allowed us to propose an algorithm for Klebsiella species and subspecies identification. Two reference strains were included and two clinical isolates which were biotyped and identified by the proposed method. rDNA16S gene restriction patterns showed differences regarding the initially identified species for conventional methods. Additionally two patterns of bands were observed for K. pneumoniae subsp. rhinoscleromatis, indicating the polymorphisms presence in the rDNA16S gene. Conclusions: We confirmed the difficulty to identify K. pneumoniae subspecies by conventional methods. Implementation of this technique could allow accurate and rapid differentiation among K. pneumoniae subsp. ozaenae and K. pneumoniae subsp. rhinoscleromatis the aetiological agents of two frequently misdiagnosed infections. Antimicrobial therapy usually could be ineffective, especially in chronic patients. Finally we consider very important to enlarge the study by using more clinical and reference strains.

  2. Design of a molecular method for subspecies specific identification of Klebsiella pneumoniae by using the 16S ribosomal subunit gene.

    Directory of Open Access Journals (Sweden)

    Nelson Enrique Arenas

    2009-12-01

    Full Text Available Introduction: Rhinoscleroma is caused by Klebsiella pneumoniae rhinoscleromatis and the ozena infections caused by K. pneumoniae ozaenae, both infections affect the upper respiratory tract. In the first clinical phases the symptoms are unspecific, and the disease can be misdiagnosed as a common cold, therefore antimicrobial therapy cannot reach effective results and patients must be following up for several years since the infection became chronic. Objective: To identify Klebsiella subspecies using a specific assay based on amplicons restriction of a gene which encodes 16S subunit ribosomal (rDNA16S.Methodology: Specific restriction patterns were generated; using reported sequences from rDNA16S gene and bioinformatics programs MACAW, PFE, GENEDOC and GENE RUNNER. Amplification and restriction assays were standardized. Results: Predictions in silico allowed to propose an algorithm for Klebsiella species and subspecies identification. Two reference strains were included and two clinical isolates which were biotyped and identified by the proposed method. rDNA16S gene restriction patterns showed differences regarding the initially identified species for conventional methods. Additionally two patterns of bands were observed for K. pneumoniae rhinoscleromatis, indicating the polymorphisms presence in the rDNA16S gene. Conclusions: It was confirmed the difficulty to identify K. pneumoniae subspecies by conventional methods. Implementation of this technique could allow an accurate and rapid differentiation among K. pneumoniae ozaenae and K. pneumoniae rhinoscleromatis aetiological agents of two frequently misdiagnosed infections. Antimicrobial therapy usually could be ineffective, especially in chronic patients. Finally it is considered very important to enlarge the study by using more clinical and reference strains.

  3. Molecular characterization of Fasciola hepatica and phylogenetic analysis based on mitochondrial (nicotiamide adenine dinucleotide dehydrogenase subunit I and cytochrome oxidase subunit I) genes from the North-East of Iran

    Science.gov (United States)

    Reaghi, Saber; Haghighi, Ali; Harandi, Majid Fasihi; Spotin, Adel; Arzamani, Kourosh; Rouhani, Soheila

    2016-01-01

    Aim: Fascioliasis is one of the most zoonotic diseases with global extension. As the epidemiological distribution of Fasciola may lead to various genetic patterns of the parasite, the aim of this study is to identify Fasciola hepatica based on spermatogenesis, and phylogenetic analysis using mitochondrial (nicotiamide adenine dinucleotide dehydrogenase subunit I [ND1] and cytochrome oxidase subunit I) gene marker. Materials and Methods: In this study, 90 F. hepatica collected from 30 cattle at slaughterhouse located in three different geographical locations in the North-East of Iran were evaluated based on spermatogenetic ability and internal transcribed spacer 1 gene restriction fragment length polymorphism pattern. Genetic diversity and phylogenetic relationship using mtDNA gene marker for the isolates from the North-East of Iran, and other countries were then analyzed. Results: Partial sequences of mtDNA showed eight haplotypes in both genes. The phylogenic analysis using neighbor joining as well as maximum likelihood methods showed similar topologies of trees. Pairwise fixation index between different F. hepatica populations calculated from the nucleotide data set of ND1 gene are statistically significant and show the genetic difference. Conclusion: F. hepatica found in this region of Iran has different genetic structures through the other Fasciola populations in the world. PMID:27733809

  4. Na/H exchanger regulatory factors control parathyroid hormone receptor signaling by facilitating differential activation of G(alpha) protein subunits.

    Science.gov (United States)

    Wang, Bin; Ardura, Juan A; Romero, Guillermo; Yang, Yanmei; Hall, Randy A; Friedman, Peter A

    2010-08-27

    The Na/H exchanger regulatory factors, NHERF1 and NHERF2, are adapter proteins involved in targeting and assembly of protein complexes. The parathyroid hormone receptor (PTHR) interacts with both NHERF1 and NHERF2. The NHERF proteins toggle PTHR signaling from predominantly activation of adenylyl cyclase in the absence of NHERF to principally stimulation of phospholipase C when the NHERF proteins are expressed. We hypothesized that this signaling switch occurs at the level of the G protein. We measured G protein activation by [(35)S]GTPgammaS binding and G(alpha) subtype-specific immunoprecipitation using three different cellular models of PTHR signaling. These studies revealed that PTHR interactions with NHERF1 enhance receptor-mediated stimulation of G(alpha)(q) but have no effect on stimulation of G(alpha)(i) or G(alpha)(s). In contrast, PTHR associations with NHERF2 enhance receptor-mediated stimulation of both G(alpha)(q) and G(alpha)(i) but decrease stimulation of G(alpha)(s). Consistent with these functional data, NHERF2 formed cellular complexes with both G(alpha)(q) and G(alpha)(i), whereas NHERF1 was found to interact only with G(alpha)(q). These findings demonstrate that NHERF interactions regulate PTHR signaling at the level of G proteins and that NHERF1 and NHERF2 exhibit isotype-specific effects on G protein activation.

  5. Protein kinase A catalytic subunit isoform PRKACA; History, function and physiology.

    Science.gov (United States)

    Turnham, Rigney E; Scott, John D

    2016-02-15

    Our appreciation of the scope and influence of second messenger signaling has its origins in pioneering work on the cAMP-dependent protein kinase. Also called protein kinase A (PKA), this holoenzyme exists as a tetramer comprised of a regulatory (R) subunit dimer and two catalytic (C) subunits. Upon binding of two molecules of the second messenger cAMP to each R subunit, a conformational change in the PKA holoenzyme occurs to release the C subunits. These active kinases phosphorylate downstream targets to propagate cAMP responsive cell signaling events. This article focuses on the discovery, structure, cellular location and physiological effects of the catalytic subunit alpha of protein kinase A (encoded by the gene PRKACA). We also explore the potential role of this essential gene as a molecular mediator of certain disease states. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. Cloning of a yeast gene coding for the glutamate synthase small subunit (GUS2) by complementation of Saccharomyces cerevisiae and Escherichia coli glutamate auxotrophs.

    Science.gov (United States)

    González, A; Membrillo-Hernández, J; Olivera, H; Aranda, C; Macino, G; Ballario, P

    1992-02-01

    A Saccharomyces cerevisiae glutamate auxotroph, lacking NADP-glutamate dehydrogenase (NADP-GDH) and glutamate synthase (GOGAT) activities, was complemented with a yeast genomic library. Clones were obtained which still lacked NADP-GDH but showed GOGAT activity. Northern analysis revealed that the DNA fragment present in the complementing plasmids coded for a 1.5kb mRNA. Since the only GOGAT enzyme so far purified from S. cerevisiae is made up of a small and a large subunit, the size of the mRNA suggested that the cloned DNA fragment could code for the GOGAT small subunit. Plasmids were purified and used to transform Escherichia coli glutamate auxotrophs. Transformants were only recovered when the recipient strain was an E. coli GDH-less mutant lacking the small GOGAT subunit. These data show that we have cloned the structural gene coding for the yeast small subunit (GUS2). Evidence is also presented indicating that the GOGAT enzyme which is synthesized in the E. coli transformants is a hybrid comprising the large E. coli subunit and the small S. cerevisiae subunit.

  7. 2,4-Decadienal downregulates TNF-alpha gene expression in THP-1 human macrophages.

    Science.gov (United States)

    Girona, J; Vallvé, J C; Ribalta, J; Heras, M; Olivé, S; Masana, L

    2001-09-01

    Oxidized lipoproteins inhibit TNF-alpha secretion by human THP-1 macrophages due, at least in part, to aldehydes derived from the oxidation of polyunsaturated fatty acids. This study extends these findings by investigating the effect of three aldehydes (2,4-decadienal (2,4-DDE), hexanal and 4-hydroxynonenal (4-HNE)) on TNF-alpha and IL-1beta mRNA expression. The 2,4-DDE and 4-HNE showed considerable biological activity which induced cytotoxicity on THP-1 macrophages at concentration of 50 microM. Hexanal, on the other hand, had a lower cytotoxic capacity and concentration of 1000 microM was needed for the effect to be observed. Exposure of THP-1 macrophages to aldehydes for 24 h inhibited TNF-alpha mRNA expression but increased or did not affect IL-1beta mRNA levels. The inhibitory action of 2,4-DDE was dose dependent and began at 5 microM (46%, P<0.001). The effect of 4-HNE was less inhibitory than 4-DDE but only when cytotoxic concentrations were used (50 microM). Very high concentrations of hexanal (200 microM) were needed to inhibit TNF-alpha expression (23%, P<0.001). This downregulation of TNF-alpha gene expression by 2,4-DDE was parallel to a lower protein production. These data indicate that low levels of 2,4-DDE may modulate inflammatory action by inhibiting TNF-alpha mRNA gene expression and that the biological activity of 2,4-DDE may be involved in the development of atherosclerosis.

  8. Reduced volume but increased training intensity elevates muscle Na+-K+ pump alpha1-subunit and NHE1 expression as well as short-term work capacity in humans

    DEFF Research Database (Denmark)

    Iaia, F. Marcello; Thomassen, Martin; Kolding, Helle;

    2008-01-01

    by 30-s sprint runs three to four times a week, whereas CON continued the endurance training ( approximately 45 km/wk). After the 4-wk sprint period, the expression of the muscle Na(+)-K(+) pump alpha(1)-subunit and Na(+)/H(+)-exchanger isoform 1 was 29 and 30% higher (P ... pulmonary maximum oxygen uptake and 10-k time were unchanged. No changes in CON were observed. The present data suggest a role of the Na(+)-K(+) pump in the control of K(+) homeostasis and in the development of fatigue during repeated high-intensity exercise. Furthermore, performance during intense exercise...

  9. Paramyotonia congenita and hyperkalemic periodic paralysis associated with a Met 1592 Val substitution in the skeletal muscle sodium channel alpha subunit--a large kindred with a novel phenotype.

    Science.gov (United States)

    Kelly, P; Yang, W S; Costigan, D; Farrell, M A; Murphy, S; Hardiman, O

    1997-03-01

    Paramyotonia congenita (PC) and Hyperkalemic periodic paralysis (HyperPP) are caused by amino acid substitutions in the alpha subunit of the human skeletal muscle sodium channel. One such substitution, methionine for valine at position 1592, has been associated with HyperPP with myotonia and cold sensitivity. We report clinical, electromyographic (EMG), genetic and pathological features of a large kindred with the Met1592Val substitution. Affected members were phenotypically heterogenous and had episodic potassium-sensitive paralysis, and stiffness and weakness induced by exercise and cold, which was confirmed by EMG studies. These features indicate a combined PC-HyperPP phenotype not previously described with this mutation.

  10. Sequence and structure of the mouse gene coding for the largest neurofilament subunit.

    NARCIS (Netherlands)

    J-P. Julien (Jean-Pierre); F. Cote; L. Beaudet (Lucille); M. Sidky (Malak); D. Flavell (David); F.G. Grosveld (Frank); W. Mushynski (Walter)

    1988-01-01

    textabstractWe have determined the complete nucleotide sequence of the mouse gene encoding the neurofilament NF-H protein. The C-terminal domain of NF-H is very rich in charged amino acids (aa) and contains a 3-aa sequence, Lys-Ser-Pro, that is repeated 51 times within a stretch of 368 aa. The

  11. Phenotypical Manifestations of Mutations in the Genes Encoding Subunits of the Cardiac Sodium Channel

    NARCIS (Netherlands)

    Wilde, Arthur A. M.; Brugada, Ramon

    2011-01-01

    Variations in the gene encoding for the major sodium channel (Na(v)1.5) in the heart, SCN5A, has been shown to cause a number of arrhythmia syndromes (with or without structural changes in the myocardium), including the long-QT syndrome (type 3), Brugada syndrome, (progressive) cardiac conduction di

  12. Functional effect of point mutations in the alpha-folate receptor gene of CABA I ovarian carcinoma cells.

    Science.gov (United States)

    Mangiarotti, F; Miotti, S; Galmozzi, E; Mazzi, M; Sforzini, S; Canevari, S; Tomassetti, A

    2001-01-01

    The alpha-folate receptor (alpha FR) is overexpressed in 90% of nonmucinous ovarian carcinomas. In addition to the known role of alpha FR binding and mediating the internalization of folates, functional interaction of alpha FR with signaling molecules was recently shown. To identify a model to study the role of alpha FR in ovarian carcinoma, we characterized the alpha FR gene in the ovarian carcinoma cell line CABA I in comparison to a reference line, IGROV1. In CABA I cells, Northern blot analysis revealed an alpha FR transcript of the expected length and FACS analysis indicated receptor expression on the cell membrane; however, RNase protection assay revealed no specific signals. Southern blot and genomic PCR analysis suggested the presence of a rearrangement(s) involving the 5' region of the gene in CABA I cells as compared to IGROV1 cells. Cloning and sequencing of CABA I alpha FR cDNA revealed several point mutations. The partitioning of alpha FR in membrane microdomains from CABA I cells and its association with regulatory molecules was comparable to that of IGROV1 cells. By contrast, the alpha FR expressed on the CABA I cell membrane bound folic acid with lower affinity, and ectopic expression of the corresponding cDNA in CHO cells confirmed impaired folic acid binding. Thus, CABA I cells may provide a tool to delineate functional domains of the alpha FR. Copyright 2001 Wiley-Liss, Inc.

  13. Intron 1 and exon 1 alpha estrogen receptor gene polymorphisms in women with endometriosis.

    Science.gov (United States)

    Sato, Hélio; Nogueira-de-Souza, Naiara C; D'Amora, Paulo; Silva, Ismael D C G; Girão, Manoel J B C; Schor, Eduardo

    2008-12-01

    To evaluate the association of intron 1 and exon 1 polymorphisms in the estrogen receptor alpha gene (ER-alpha) with endometriosis in women. Association study. Endometriosis Unit, Federal University of São Paulo. The control group consisted of volunteers older than 45 years who had no evidence of endometriosis antecedents. Two groups with the disease were evaluated: the first group had stage I or II endometriosis and the second group stage III or IV. Polymerase chain reaction (PCR) followed by digestion with HaeIII and MspI endonucleases (RFLP) were applied to detect intron 1 and exon 1 polymorphisms, respectively, in a total of 125 controls and 105 affected women. Frequency and distribution of HaeIII and MspI polymorphisms in ER-alpha. No significant differences in the frequency of polymorphisms either in intron 1 or exon 1 of ER-alpha were found when endometriosis patients were compared with control subjects. Furthermore, the frequency of ER-alpha polymorphisms within the two different groups of patients with disease was statistically similar. The odds ratio between presence of intron 1 single-nucleotide polymorphisms (SNP) and endometriosis was 0.904, and the odds ratio between exon 1 SNP and endometriosis was 0.976. The evaluated polymorphisms were not associated with endometriosis.

  14. Erythroid cell-specific alpha-globin gene regulation by the CP2 transcription factor family.

    Science.gov (United States)

    Kang, Ho Chul; Chae, Ji Hyung; Lee, Yeon Ho; Park, Mi-Ae; Shin, June Ho; Kim, Sung-Hyun; Ye, Sang-Kyu; Cho, Yoon Shin; Fiering, Steven; Kim, Chul Geun

    2005-07-01

    We previously demonstrated that ubiquitously expressed CP2c exerts potent erythroid-specific transactivation of alpha-globin through an unknown mechanism. This mechanism is reported here to involve specific CP2 splice variants and protein inhibitor of activated STAT1 (PIAS1). We identify a novel murine splice isoform of CP2, CP2b, which is identical to CP2a except that it has an additional 36 amino acids encoded by an extra exon. CP2b has an erythroid cell-specific transcriptional activation domain, which requires the extra exon and can form heteromeric complexes with other CP2 isoforms, but lacks the DNA binding activity found in CP2a and CP2c. Transcriptional activation of alpha-globin occurred following dimerization between CP2b and CP2c in erythroid K562 and MEL cells, but this dimerization did not activate the alpha-globin promoter in nonerythroid 293T cells, indicating that an additional erythroid factor is missing in 293T cells. PIAS1 was confirmed as a CP2 binding protein by the yeast two-hybrid screen, and expression of CP2b, CP2c, and PIAS1 in 293T cell induced alpha-globin promoter activation. These results show that ubiquitously expressed CP2b exerts potent erythroid cell-specific alpha-globin gene expression by complexing with CP2c and PIAS1.

  15. Definition of the low molecular weight glutenin subunit gene family members in a set of standard bread wheat (Triticum aestivum L.) varieties

    Science.gov (United States)

    Low-molecular-weight glutenin subunits (LMW-GS) are a class of seed storage proteins that play a major role in the determination of the viscoelastic properties of wheat dough. Most of the LMW-GSs are encoded by a multi-gene family located on the short arms of the homoeologous group 1 chromosomes, at...

  16. Genes encoding biotin carboxylase subunit of acetyl-CoA carboxylase from Brassica napus and parental species: cloning, expression patterns, and evolution

    Science.gov (United States)

    Comparative genomics is a useful tool to investigate gene and genome evolution. Biotin carboxylase (BC), an important subunit of heteromeric ACCase that is a rate-limiting enzyme in fatty acid biosynthesis in dicots, catalyzes ATP, biotin-carboxyl-carrier protein and CO2 to form carboxybiotin-carbo...

  17. Phylogeny, clinical associations, and diagnostic utility of the pilin subunit gene (sfpA) of sorbitol-fermenting, enterohemorrhagic Escherichia coli O157:H-

    NARCIS (Netherlands)

    Friedrich, Alexander W; Nierhoff, Katja V; Bielaszewska, Martina; Mellmann, Alexander; Karch, Helge

    2004-01-01

    The plasmid-borne sfpA gene encodes the pilin subunit in sorbitol-fermenting (SF) enterohemorrhagic Escherichia coli (EHEC) O157:H-. We investigated the distribution of sfpA among 600 E. coli isolates comprising the complete E. coli standard reference (ECOR) and diarrheagenic E. coli (DEC) strain co

  18. Spurious Amplification of a Plasmodium vivax Small-Subunit RNA Gene by Use of Primers Currently Used To Detect P. knowlesi▿

    Science.gov (United States)

    Imwong, Mallika; Tanomsing, Naowarat; Pukrittayakamee, Sasithon; Day, Nicholas P. J.; White, Nicholas J.; Snounou, Georges

    2009-01-01

    The PCR primers commonly used to detect Plasmodium knowlesi infections in humans were found to cross-react stochastically with P. vivax genomic DNA. A nested primer set that targets one of the P. knowlesi small-subunit rRNA genes was validated for specificity and for sensitivity of detection of <10 parasite genomes. PMID:19812279

  19. Phylogeny, clinical associations, and diagnostic utility of the pilin subunit gene (sfpA) of sorbitol-fermenting, enterohemorrhagic Escherichia coli O157:H-

    NARCIS (Netherlands)

    Friedrich, Alexander W; Nierhoff, Katja V; Bielaszewska, Martina; Mellmann, Alexander; Karch, Helge

    2004-01-01

    The plasmid-borne sfpA gene encodes the pilin subunit in sorbitol-fermenting (SF) enterohemorrhagic Escherichia coli (EHEC) O157:H-. We investigated the distribution of sfpA among 600 E. coli isolates comprising the complete E. coli standard reference (ECOR) and diarrheagenic E. coli (DEC) strain co

  20. Gene expression profiles and phosphorylation patterns of AMP-activated protein kinase subunits in various mesenchymal cell types

    Institute of Scientific and Technical Information of China (English)

    Wang Yugang; Fan Qiming; Ma Rui; Lin Wentao; Tang Tingting

    2014-01-01

    Background Recent studies on bone have shown an endocrine role of the skeleton,which could be impaired in various human diseases,including osteoporosis,obesity,and diabetes-associated bone diseases.As a sensor and regulator of energy metabolism,AMP-activated protein kinase (AMPK) may also play an important role in the regulation of bone metabolism.The current study aimed to establish the expression profiles and phosphorylation patterns of AMPK subunits in several mesenchymal cell types.Methods Reverse transcription-polymerase chain reaction (PCR) for relative quantification,real-time PCR for absolute quantification,and Western blotting were used to investigate the gene expression profiles and phosphorylation patterns of AMPK subunits in several mesenchymal cell types,including primary human mesenchymal stem cells (hMSCs) and hFOB,Saos-2,C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 cells.Results AMPKα1 and AMPKβ1 mRNAs were abundantly expressed in all cell types.AMPKY1 mRNA was abundantly expressed in C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 but not detected in human-derived cell types.AMPKY2 mRNA was mildly expressed in all cell types.AMPKα1 protein was highly expressed in all cell types and AMPKα2 protein was highly expressed only in hFOB and Saos-2 cells.AMPKβ1 protein was abundantly expressed in all cell types except for Saos-2,in which AMPKβ2 protein overwhelmed AMPKβ1 expression.AMPKy1 and AMPKY2 proteins were expressed in C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 cells and only AMPKY2 protein was expressed in hMSCs,hFOB and Saos2 cells.AMPKα was phosphorylated at Thr172 and Ser485 and AMPKβ1 was phosphorylated at Ser108 and Ser182 in all cell types with a specific pattern in each cell type.Conclusion The combination of AMPK α,β,and Y subunits and phosphorylation of AMPKα (Thr172 and Ser485) and AMPKβ1 (Ser108 and Ser182) showed a specific pattern in each cell type.

  1. ANKS1B Gene Product AIDA-1 Controls Hippocampal Synaptic Transmission by Regulating GluN2B Subunit Localization.

    Science.gov (United States)

    Tindi, Jaafar O; Chávez, Andrés E; Cvejic, Svetlana; Calvo-Ochoa, Erika; Castillo, Pablo E; Jordan, Bryen A

    2015-06-17

    NMDA receptors (NMDARs) are key mediators of glutamatergic transmission and synaptic plasticity, and their dysregulation has been linked to diverse neuropsychiatric and neurodegenerative disorders. While normal NMDAR function requires regulated expression and trafficking of its different subunits, the molecular mechanisms underlying these processes are not fully understood. Here we report that the amyloid precursor protein intracellular domain associated-1 protein (AIDA-1), which associates with NMDARs and is encoded by ANKS1B, a gene recently linked to schizophrenia, regulates synaptic NMDAR subunit composition. Forebrain-specific AIDA-1 conditional knock-out (cKO) mice exhibit reduced GluN2B-mediated and increased GluN2A-mediated synaptic transmission, and biochemical analyses show AIDA-1 cKO mice have low GluN2B and high GluN2A protein levels at isolated hippocampal synaptic junctions compared with controls. These results are corroborated by immunocytochemical and electrophysiological analyses in primary neuronal cultures following acute lentiviral shRNA-mediated knockdown of AIDA-1. Moreover, hippocampal NMDAR-dependent but not metabotropic glutamate receptor-dependent plasticity is impaired in AIDA-1 cKO mice, further supporting a role for AIDA-1 in synaptic NMDAR function. We also demonstrate that AIDA-1 preferentially associates with GluN2B and with the adaptor protein Ca(2+)/calmodulin-dependent serine protein kinase and kinesin KIF17, which regulate the transport of GluN2B-containing NMDARs from the endoplasmic reticulum (ER) to synapses. Consistent with this function, GluN2B accumulates in ER-enriched fractions in AIDA-1 cKO mice. These findings suggest that AIDA-1 regulates NMDAR subunit composition at synapses by facilitating transport of GluN2B from the ER to synapses, which is critical for NMDAR plasticity. Our work provides an explanation for how AIDA-1 dysfunction might contribute to neuropsychiatric conditions, such as schizophrenia. Copyright

  2. Molecular cloning of the cDNA encoding follicle-stimulating hormone beta subunit of the Chinese soft-shell turtle Pelodiscus sinensis, and its gene expression.

    Science.gov (United States)

    Chien, Jung-Tsun; Shen, San-Tai; Lin, Yao-Sung; Yu, John Yuh-Lin

    2005-04-01

    Follicle-stimulating hormone (FSH) is a member of the pituitary glycoprotein hormone family. These hormones are composed of two dissimilar subunits, alpha and beta. Very little information is available regarding the nucleotide and amino acid sequence of FSHbeta in reptilian species. For better understanding of the phylogenetic diversity and evolution of FSH molecule, we have isolated and sequenced the complementary DNA (cDNA) encoding the Chinese soft-shell turtle (Pelodiscus sinensis, Family of Trionychidae) FSHbeta precursor molecule by reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA end (RACE) methods. The cloned Chinese soft-shell turtle FSHbeta cDNA consists of 602-bp nucleotides, including 34-bp nucleotides of the 5'-untranslated region (UTR), 396-bp of the open reading frame, and 3'-UTR of 206-bp nucleotides. It encodes a 131-amino acid precursor molecule of FSHbeta subunit with a signal peptide of 20 amino acids followed by a mature protein of 111 amino acids. Twelve cysteine residues, forming six disulfide bonds within beta-subunit and two putative asparagine-linked glycosylation sites, are also conserved in the Chinese soft-shell turtle FSHbeta subunit. The deduced amino acid sequence of the Chinese soft-shell turtle FSHbeta shares identities of 97% with Reeves's turtle (Family of Bataguridae), 83-89% with birds, 61-70% with mammals, 63-66% with amphibians and 40-58% with fish. By contrast, when comparing the FSHbeta with the beta-subunits of the Chinese soft-shell turtle luteinizing hormone and thyroid stimulating hormone, the homologies are as low as 38 and 39%, respectively. A phylogenetic tree including reptilian species of FSHbeta subunits, is presented for the first time. Out of various tissues examined, FSHbeta mRNA was only expressed in the pituitary gland and can be up-regulated by gonadotropin-releasing hormone in pituitary tissue culture as estimated by fluorescence real-time PCR analysis.

  3. Sequence Variation of the Pertussis Toxin S1 Subunit Encoding Gene in the Clinical Isolates of Bordetella pertussis in Iran

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    Hosseinpour

    2015-08-01

    Full Text Available Background Whooping cough (pertussis is an acute respiratory disease caused by Bordetella pertussis (B. pertussis. Pertussis toxin is an important virulence factor of B. pertussis and plays a major role in the immune and inflammatory responses. Likewise, allelic variations in the genes of virulence factors have led to the non-responsiveness of the new strains to both whole-cell and acellular vaccines. Given the importance of pertussis vaccine, we sought to address the lack of fundamental studies on the polymorphisms of the virulence genes of B. pertussis in Iran. Objectives The aim of this study was to identify the polymorphisms of the pertussis toxin S1 subunit (ptxS1 gene in the circulating strains and compare them to the vaccine strain. Patients and Methods In this study, 50 strains of B. pertussis isolated from patients with pertussis were investigated in the pertussis reference laboratory of Pasteur institute of Iran. Cultivation, biochemical tests, and the specific antisera were used to confirm B. pertussis. The sequencing of the polymerase chain reaction products was performed to determine the ptxS1 alleles, and B. pertussis 134 was studied as the vaccine strain. Results The results showed that all the strains had the dominant allele ptxS1A. There were differences between the alleles of the clinical strains and the vaccine strain. Conclusions In recent years, a significant increase in the incidence of pertussis has been reported worldwide. Our findings regarding the allelic shift of the ptxS1 gene are similar to those reported in many European and American countries showing the difference of the dominant allele of ptxS1 between the circulating isolates and the vaccine strains.

  4. Duplication and Loss of Function of Genes Encoding RNA Polymerase III Subunit C4 Causes Hybrid Incompatibility in Rice

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    Giao Ngoc Nguyen

    2017-08-01

    Full Text Available Reproductive barriers are commonly observed in both animals and plants, in which they maintain species integrity and contribute to speciation. This report shows that a combination of loss-of-function alleles at two duplicated loci, DUPLICATED GAMETOPHYTIC STERILITY 1 (DGS1 on chromosome 4 and DGS2 on chromosome 7, causes pollen sterility in hybrid progeny derived from an interspecific cross between cultivated rice, Oryza sativa, and an Asian annual wild rice, O. nivara. Male gametes carrying the DGS1 allele from O. nivara (DGS1-nivaras and the DGS2 allele from O. sativa (DGS2-T65s were sterile, but female gametes carrying the same genotype were fertile. We isolated the causal gene, which encodes a protein homologous to DNA-dependent RNA polymerase (RNAP III subunit C4 (RPC4. RPC4 facilitates the transcription of 5S rRNAs and tRNAs. The loss-of-function alleles at DGS1-nivaras and DGS2-T65s were caused by weak or nonexpression of RPC4 and an absence of RPC4, respectively. Phylogenetic analysis demonstrated that gene duplication of RPC4 at DGS1 and DGS2 was a recent event that occurred after divergence of the ancestral population of Oryza from other Poaceae or during diversification of AA-genome species.

  5. A split and rearranged nuclear gene encoding the iron-sulfur subunit of mitochondrial succinate dehydrogenase in Euglenozoa

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    Gray Michael W

    2009-02-01

    Full Text Available Abstract Background Analyses based on phylogenetic and ultrastructural data have suggested that euglenids (such as Euglena gracilis, trypanosomatids and diplonemids are members of a monophyletic lineage termed Euglenozoa. However, many uncertainties are associated with phylogenetic reconstructions for ancient and rapidly evolving groups; thus, rare genomic characters become increasingly important in reinforcing inferred phylogenetic relationships. Findings We discovered that the iron-sulfur subunit (SdhB of mitochondrial succinate dehydrogenase is encoded by a split and rearranged nuclear gene in Euglena gracilis and trypanosomatids, an example of a rare genomic character. The two subgenic modules are transcribed independently and the resulting mRNAs appear to be independently translated, with the two protein products imported into mitochondria, based on the presence of predicted mitochondrial targeting peptides. Although the inferred protein sequences are in general very divergent from those of other organisms, all of the required iron-sulfur cluster-coordinating residues are present. Moreover, the discontinuity in the euglenozoan SdhB sequence occurs between the two domains of a typical, covalently continuous SdhB, consistent with the inference that the euglenozoan 'half' proteins are functional. Conclusion The discovery of this unique molecular marker provides evidence for the monophyly of Euglenozoa that is independent of evolutionary models. Our results pose questions about the origin and timing of this novel gene arrangement and the structure and function of euglenozoan SdhB.

  6. Apparent selection intensity for the cytochrome oxidase subunit I gene varies with mode of reproduction in echinoderms.

    Science.gov (United States)

    Foltz, David W; Hrincevich, Adam W; Rocha-Olivares, Axayácatl

    2004-10-01

    When most amino acid substitutions in protein-coding genes are slightly deleterious rather than selectively neutral, life history differences can potentially modify the effective population size or the selective regime, resulting in altered ratios of non-synonymous to synonymous substitutions among taxa. We studied substitution patterns for the mitochondrial cytochrome oxidase subunit I (COI) gene in a sea star genus (Leptasterias spp.) with an obligate brood-protecting mode of reproduction and small-scale population genetic subdivision, and compared the results to available COI sequences in nine other genera of echinoderms with pelagic larvae: three sea stars, five sea urchins and one brittle star. We predicted that this life history difference would be associated with differences in the ratio of non-synonymous (dN) to synonymous (dS) substitution rates. Leptasterias had a significantly greater dN/dS ratio (both between species and within species), a significantly smaller transition/transversion rate ratio, and a significantly lower average nucleotide diversity within species, than did the non-brooding genera. Other explanations for the results, such as altered mutation rates or selective sweeps, were not supported by the data analysis. These findings highlight the potential influence of reproductive traits and other life history factors on patterns of nucleotide substitution within and between species.

  7. Genetic diversity of Echinococcus granulosus in southwest China determined by the mitochondrial NADH dehydrogenase subunit 2 gene.

    Science.gov (United States)

    Wang, Jiahai; Wang, Ning; Hu, Dandan; Zhong, Xiuqin; Wang, Shuxian; Gu, Xiaobin; Peng, Xuerong; Yang, Guangyou

    2014-01-01

    We evaluated genetic diversity and structure of Echinococcus granulosus by analyzing the complete mitochondrial NADH dehydrogenase subunit 2 (ND2) gene in 51 isolates of E. granulosus sensu stricto metacestodes collected at three locations in this region. We detected 19 haplotypes, which formed a distinct clade with the standard sheep strain (G1). Hence, all 51 isolates were identified as E. granulosus sensu stricto (G1-G3). Genetic relationships among haplotypes were not associated with geographical divisions, and fixation indices (Fst) among sampling localities were low. Hence, regional populations of E. granulosus in the southwest China are not differentiated, as gene flow among them remains high. This information is important for formulating unified region-wide prevention and control measures. We found large negative Fu's Fs and Tajima's D values and a unimodal mismatch distribution, indicating that the population has undergone a demographic expansion. We observed high genetic diversity among the E. granulosus s. s. isolates, indicating that the parasite population in this important bioregion is genetically robust and likely to survive and spread. The data from this study will prove valuable for future studies focusing on improving diagnosis and prevention methods and developing robust control strategies.

  8. Establishment of a continuous culture system for Entamoeba muris and analysis of the small subunit rRNA gene

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    Kobayashi S.

    2009-06-01

    Full Text Available We established a culture system for Entamoeba muris (MG-EM-01 strain isolated from a Mongolian gerbil using a modified Balamuth’s egg yolk infusion medium supplemented with 4% adult bovine serum and Bacteroides fragilis cocultured with Escherichia coli. Further, encystation was observed in the culture medium. The morphological characteristics of E. muris are similar to those of Entamoeba coli (E. coli; moreover, the malic isoenzyme electrophoretic band, which shows species-specific electrophoretic mobility, of E. muris had almost the same mobility as that observed with the malic isoenzyme electrophorectic band of E. coli (UZG-EC-01 strain isolated from a gorilla. We determined the small subunit rRNA (SSU-rRNA gene sequence of the MG-EM-01 strain, and this sequence was observed to show 82.7% homology with that of the UZG-EC-01 strain. Further, the resultant phylogenetic tree for molecular taxonomy based on the SSU-rRNA genes of the 21 strains of the intestinal parasitic amoeba species indicated that the MG-EM-01 strain was most closely related to E. coli.

  9. Pituitary control of branchial NCC, NKCC and Na(+), K (+)-ATPase α-subunit gene expression in Nile tilapia, Oreochromis niloticus.

    Science.gov (United States)

    Breves, Jason P; Seale, Andre P; Moorman, Benjamin P; Lerner, Darren T; Moriyama, Shunsuke; Hopkins, Kevin D; Grau, E Gordon

    2014-05-01

    This study investigated endocrine control of branchial ionoregulatory function in Nile tilapia (Oreochromis niloticus) by prolactin (Prl188 and Prl177), growth hormone (Gh) and cortisol. Branchial expression of Na(+)/Cl(-) cotransporter (ncc) and Na(+)/K(+)/2Cl(-) cotransporter (nkcc) genes were employed as specific markers for freshwater- and seawater-type ionocytes, respectively. We further investigated whether Prl, Gh and cortisol direct expression of two Na(+), K(+)-ATPase (nka)-α1 subunit genes, denoted nka-α1a and nka-α1b. Tilapia transferred to fresh water following hypophysectomy failed to adequately activate gill ncc expression; ncc expression was subsequently restored by Prl replacement. Prl188 and Prl177 stimulated ncc expression in cultured gill filaments in a concentration-related manner, suggesting that ncc is regulated by Prl in a gill-autonomous fashion. Tilapia transferred to brackish water (23 ‰) following hypophysectomy exhibited a reduced capacity to up-regulate nka-α1b expression. However, Gh and cortisol failed to affect nka-α1b expression in vivo. Similarly, we found no clear effects of Gh or cortisol on nkcc expression both in vivo and in vitro. When considered with patterns previously described in euryhaline Mozambique tilapia (O. mossambicus), the current study suggests that ncc is a conserved target of Prl in tilapiine cichlids. In addition, we revealed contrasting dependencies upon the pituitary to direct nka-α1b expression in hyperosmotic environments between Nile and Mozambique tilapia.

  10. Detection of Clostridium perfringens alpha toxin gene in lambs by loop mediated isothermal amplification

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    B. Radhika

    2016-01-01

    Full Text Available Aim: The loop mediated isothermal amplification (LAMP was standardized for rapid detection of Clostridium perfringens. Materials and Methods: A total of 120 fecal samples were collected from enterotoxemia suspected lambs were used for screening of C. perfringens cpa gene by LAMP. The specificity of the LAMP amplified products was tested by digesting with restriction enzyme XmnI for alpha toxin gene. Results: Out of 120 samples screened 112 (93.3% samples were positive by both LAMP and polymerase chain reaction (PCR for detection of cpa gene which indicated the equal sensitivity of both the tests. The enzyme produced single cut in 162 base pair amplified product of alpha toxin gene at 81 base pair resulting in a single band in gel electrophoresis. Conclusion: Both LAMP and PCR for detection of cpa gene indicated the equal sensitivity of both the tests. Standardization of LAMP reaction for amplification of epsilon and beta toxin genes will help to identify the C. perfringens toxin types from the clinical samples. The test could be a suitable alternative to the PCR in detection of toxin types without the help of sophisticated machinery like thermal cycler. Considering its simplicity in operation and high sensitivity, there is the potential use of this technique in clinical diagnosis and surveillance of infectious diseases.

  11. A Novel Approach to Functional Analysis of the Ribulose Bisphosphate Carboxylase Small Subunit Gene by Agrobacterium-Mediated Gene Silencing

    Institute of Scientific and Technical Information of China (English)

    Xiao-Fu Zhou; Peng-Da Ma; Ren-Hou Wang; Bo Liu; Xing-Zhi Wang

    2006-01-01

    A novel approach to virus-induced post-transcriptional gene silencing for studying the function of the ribulose bisphosphate carboxylase small subunlt (rbcS) gene was established and optimized using potato virus X vector and Nicotiana benthamiana as experimental material. The analysis of silencing phenomena,transcriptional level, protein expression, and pigment measurement showed that the expression of the rbcS endogenous gene was inactivated by the expression of a 500-bp homologous cDNA fragment carried in the virus vector.

  12. Identification and characterization of human neuronal voltage-gated calcium channel gamma 3 subunit gene

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    By homologous expressed sequence tag (EST) searching,one EST (GenBank: W29095) was obtained,which shows 75% identity in 435 bp overlap with the coding sequence of mouse Cacng2 gene. A 1 545 bp cDNA fragment was obtained from the nested polymerase chain reaction (PCR) and rapid applification of cDNA end (RACE) reaction in the human brain prefrontal cortex cDNA library and the human brain Ready cDNA with the primers designed on W29095. The fragment contained a 948-bp open reading frame (ORF) encoding 315 amino acids,and was named CACNG3. As it was identical to a BAC clone (GenBank: AC004125) from chromosome 16p12-p13.1,the CACNG3 gene was mapped to human chromosome 16p12-p13.1,and the coding region was composed of 4 exons. Reverse transcription PCR (RT-PCR) analysis showed that the CACNG3 gene expressed in human adult brain and fetal brain. Single strand comformation polymorphism (SSCP) analysis was performed in 3 pedigrees with autosomal recessive retinitis pigmentosa,8 pedigrees with autosomal recessive retinitis pigmentosa accompanied by deafness and 2 pedigrees with epilepsy,but no mutation was detected.

  13. Initial analysis of the hemocyanin subunit type 1 (Hc1 gene) from Locusta migratoria manilensis.

    Science.gov (United States)

    Yin, Hong; Guan, Ni; Dong, Lijun; Yue, Qiaoyun; Yin, Xiangchu; Zhang, Daochuan

    2012-03-01

    Hemocyanins are copper-containing (Cu(+)) proteins that transport oxygen in many arthropods hemolymph. We characterized Hc1 gene from the grasshopper species Locusta migratoria manilensis. In particular, we cloned and sequenced the corresponding cDNAs and studied their expression at different developmental stages. The cDNA of Hc1 gene (GenBank accession no.:HQ213937) is 2271 bp in length and the open reading frame is 2016 bp, which encodes a 672 amino acids protein with a calculated molecular mass of 77.9 kD and the isoelectric point of 6.06. Sequence alignment analysis result showed that this gene shares 94.7% identity with Schistocerca americana EHP. In addition, analysis of quantitative RT-PCR indicated that, LmiHc1 was expressed in the embyro (24, 39, 62, 86, 144, and 193 h after hatch), nymphs (1st instar, 2nd instar, 3rd instar, 4th instar and 5th instar) and in adult. These results showed that Hc1 plays an important role in grasshopper, which may be related to an enhanced oxygen supply. Phylogenetic analysis of insecta based on Hc1 are basically consistent with the morphology.

  14. TCR gene segments from at least one third of V alpha subfamilies rearrange at the delta locus.

    Science.gov (United States)

    Genevée, C; Chung, V; Diu, A; Hercend, T; Triebel, F

    1994-02-01

    Using PCR and an experimentally validated V alpha subfamily-specific oligonucleotide panel (V alpha 1-w29), we have investigated whether the TCR delta chain may increase its combinatorial diversity by using V genes considered as alpha chain-specific. We show that at least 10 distinct human V alpha segments rearrange at the J delta locus, leading to scrambling of the two V gene repertoires. Fifty-five per cent of the V alpha/J delta transcripts characterized here were in frame. The 17 V alpha/C delta chains analysed included an extended CDR3 region with up to 18 aa encoded by the junctional region. In addition, a new J delta segment (J delta 4) has been characterized. Together, these findings demonstrate that combinatorial diversity in the human delta locus is larger than previously thought.

  15. New insight into the role of the β3 subunit of the GABAA-R in development, behavior, body weight regulation, and anesthesia revealed by conditional gene knockout

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    Hileman Stanley M

    2007-10-01

    Full Text Available Abstract Background The β3 subunit of the γ-aminobutyric acid type A receptor (GABAA-R has been reported to be important for palate formation, anesthetic action, and normal nervous system function. This subunit has also been implicated in the pathogenesis of Angelman syndrome and autism spectrum disorder. To further investigate involvement of this subunit, we previously produced mice with a global knockout of β3. However, developmental abnormalities, compensation, reduced viability, and numerous behavioral abnormalities limited the usefulness of that murine model. To overcome many of these limitations, a mouse line with a conditionally inactivated β3 gene was engineered. Results Gene targeting and embryonic stem cell technologies were used to create mice in which exon 3 of the β3 subunit was flanked by loxP sites (i.e., floxed. Crossing the floxed β3 mice to a cre general deleter mouse line reproduced the phenotype of the previously described global knockout. Pan-neuronal knockout of β3 was achieved by crossing floxed β3 mice to Synapsin I-cre transgenic mice. Palate development was normal in pan-neuronal β3 knockouts but ~61% died as neonates. Survivors were overtly normal, fertile, and were less sensitive to etomidate. Forebrain selective knockout of β3 was achieved using α CamKII-cre transgenic mice. Palate development was normal in forebrain selective β3 knockout mice. These knockouts survived the neonatal period, but ~30% died between 15–25 days of age. Survivors had reduced reproductive fitness, reduced sensitivity to etomidate, were hyperactive, and some became obese. Conclusion Conditional inactivation of the β3 gene revealed novel insight into the function of this GABAA-R subunit. The floxed β3 knockout mice described here will be very useful for conditional knockout studies to further investigate the role of the β3 subunit in development, ethanol and anesthetic action, normal physiology, and pathophysiologic processes.

  16. Nucleotide sequences of two fimbrial major subunit genes, pmpA and ucaA, from canine-uropathogenic Proteus mirabilis strains.

    Science.gov (United States)

    Bijlsma, I G; van Dijk, L; Kusters, J G; Gaastra, W

    1995-06-01

    Proteus mirabilis strains were isolated from dogs with urinary tract infection (UTI) and fimbriae were prepared from two strains. The N-terminal amino acid sequences of the major fimbrial subunits were determined and both sequences appeared identical to the N-terminal amino acid sequence of a urinary cell adhesin (UCA) (Wray, S. K., Hull, S. I., Cook, R. G., Barrish, J. & Hull, R. A., 1986, Infect Immun 54, 43-49). The genes of two different major fimbrial subunits were cloned using oligonucleotide probes that were designed on the basis of the N-terminal UCA sequence. Nucleotide sequencing revealed the complete ucaA gene of 540 bp (from strain IVB247) encoding a polypeptide of 180 amino acids, including a 22 amino acid signal sequence peptide, and the pmpA (P. mirabilis P-like pili) gene of 549 bp (from strain IVB219) encoding a polypeptide of 183 amino acids, including a 23 amino acid signal sequence. Hybridization experiments gave clear indications of the presence of both kinds of fimbriae in many UTI-related canine P. mirabilis isolates. However, the presence of these fimbriae could not be demonstrated in P. vulgaris or other Proteus-related species. Database analysis of amino acid sequences of major subunit proteins revealed that the UcaA protein shares about 56% amino acid identity with the F17A and F111A major fimbrial subunits from bovine enterotoxigenic Escherichia coli. In turn, the PmpA protein more closely resembled the pyelonephritis-associated pili (Pap)-like major subunit protein from UTI-related E. coli. The evolutionary relationship of UcaA, PmpA and various other fimbrial subunit proteins is presented in a phylogenetic tree.

  17. Molecular cloning and expression of two alpha-amylase genes from Streptococcus bovis 148 in Escherichia coli.

    OpenAIRE

    Satoh, E; Niimura, Y; UCHIMURA, T; Kozaki, M; Komagata, K

    1993-01-01

    The alpha-amylase genes of Streptococcus bovis 148 were cloned in Escherichia coli MC1061, using pBR322. The recombinant plasmids were classified into two groups on the basis of their restriction maps. Southern blot analysis did not show homology between the two types of alpha-amylase genes, and the two alpha-amylase genes existed on the chromosomal DNA of S. bovis 148. The enzymatic properties and N-terminal amino acid sequences of the two purified enzymes produced by the cloned E. coli stra...

  18. The alpha(1G)-subunit of a voltage-dependent Ca(2+) channel is localized in rat distal nephron and collecting duct

    DEFF Research Database (Denmark)

    Andreasen, D; Jensen, B L; Hansen, P B

    2000-01-01

    +CCD), and inner medullary collecting duct (IMCD). alpha(1G) mRNA was expressed in the IMCD cell line mIMCD-3. Single- and double-labeling immunohistochemistry and confocal laser microscopy on semithin paraffin sections of rat kidneys by using an anti-alpha(1G) antibody demonstrated a distinct labeling...

  19. Gene expression of estrogen receptor-alpha in orbital fibroblasts in Graves’ ophthalmopathy

    OpenAIRE

    Cury, Sarah Santiloni; Oliveira,Miriane; Síbio, Maria Teresa; Clara,Sueli; Luvizotto, Renata de Azevedo Melo; Conde,Sandro; Jorge, Edson Nacib [UNESP; Nunes, Vania Dos Santos [UNESP; Nogueira, Célia Regina; Mazeto, Gláucia Maria Ferreira da Silva

    2015-01-01

    Graves’ ophthalmopathy (GO) is one of the most severe clinical manifestations of Graves’ disease (GD), and its treatment might involve high-dose glucocorticoid therapy. The higher incidence of GO among females, and the reported association between polymorphisms of estrogen receptor (ER) and GD susceptibility have led us to question the role of estrogen and its receptor in GO pathogenesis. We, thus, assessed estrogen receptor-alpha (ERA) gene expression in cultures of orbital fibro...

  20. The spectrum of low molecular weight alpha-amylase/protease inhibitor genes expressed in the US bread wheat cultivar Butte 86

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    Vensel William H

    2011-07-01

    Full Text Available Abstract Background Wheat grains accumulate a variety of low molecular weight proteins that are inhibitors of alpha-amylases and proteases and play an important protective role in the grain. These proteins have more balanced amino acid compositions than the major wheat gluten proteins and contribute important reserves for both seedling growth and human nutrition. The alpha-amylase/protease inhibitors also are of interest because they cause IgE-mediated occupational and food allergies and thereby impact human health. Results The complement of genes encoding alpha-amylase/protease inhibitors expressed in the US bread wheat Butte 86 was characterized by analysis of expressed sequence tags (ESTs. Coding sequences for 19 distinct proteins were identified. These included two monomeric (WMAI, four dimeric (WDAI, and six tetrameric (WTAI inhibitors of exogenous alpha-amylases, two inhibitors of endogenous alpha-amylases (WASI, four putative trypsin inhibitors (CMx and WTI, and one putative chymotrypsin inhibitor (WCI. A number of the encoded proteins were identical or very similar to proteins in the NCBI database. Sequences not reported previously included variants of WTAI-CM3, three CMx inhibitors and WTI. Within the WDAI group, two different genes encoded the same mature protein. Based on numbers of ESTs, transcripts for WTAI-CM3 Bu-1, WMAI Bu-1 and WTAI-CM16 Bu-1 were most abundant in Butte 86 developing grain. Coding sequences for 16 of the inhibitors were unequivocally associated with specific proteins identified by tandem mass spectrometry (MS/MS in a previous proteomic analysis of milled white flour from Butte 86. Proteins corresponding to WDAI Bu-1/Bu-2, WMAI Bu-1 and the WTAI subunits CM2 Bu-1, CM3 Bu-1 and CM16 Bu-1 were accumulated to the highest levels in flour. Conclusions Information on the spectrum of alpha-amylase/protease inhibitor genes and proteins expressed in a single wheat cultivar is central to understanding the importance of

  1. Restriction fragment length polymorphism of ovine casein genes: close linkage between the alpha s1-, alpha s2-, beta- and kappa-casein loci.

    Science.gov (United States)

    Leveziel, H; Metenier, L; Guerin, G; Cullen, P; Provot, C; Bertaud, M; Mercier, J C

    1991-01-01

    Restriction fragment length polymorphism (RFLP) of ovine casein genes was investigated. Genomic DNA from 56 rams was digested with 10 restriction endonucleases and Southern blots probed with the four ovine casein cDNAs (alpha s1-, beta-, alpha s2- and kappa-Cn). Five enzymes, namely, BglI, PvuII, RsaI, TaqI and HindIII revealed nine different RFLPs. The inheritance of six of these polymorphisms was studied by segregation analysis of gametes in nine rams' families, and each of them could be related to the existence of alleles at the relevant casein locus. A close linkage between the four ovine casein genes was demonstrated since no recombination within the four pairs of loci examined, alpha s1-beta-Cn, alpha s1-kappa-Cn, beta-kappa-Cn and alpha s2-kappa-Cn, was observed in the progeny of double heterozygous rams. The casein genes are thus clustered in the ovine species as in the case of other mammals.

  2. PKA regulatory subunit expression in tooth development.

    Science.gov (United States)

    de Sousa, Sílvia Ferreira; Kawasaki, Katsushige; Kawasaki, Maiko; Volponi, Ana Angelova; Gomez, Ricardo Santiago; Gomes, Carolina Cavaliéri; Sharpe, Paul T; Ohazama, Atsushi

    2014-05-01

    Protein kinase A (PKA) plays critical roles in many biological processes including cell proliferation, cell differentiation, cellular metabolism and gene regulation. Mutation in PKA regulatory subunit, PRKAR1A has previously been identified in odontogenic myxomas, but it is unclear whether PKA is involved in tooth development. The aim of the present study was to assess the expression of alpha isoforms of PKA regulatory subunit (Prkar1a and Prkar2a) in mouse and human odontogenesis by in situ hybridization. PRKAR1A and PRKAR2A mRNA transcription was further confirmed in a human deciduous germ by qRT-PCR. Mouse Prkar1a and human PRKAR2A exhibited a dynamic spatio-temporal expression in tooth development, whereas neither human PRKAR1A nor mouse Prkar2a showed their expression in odontogenesis. These isoforms thus showed different expression pattern between human and mouse tooth germs. Copyright © 2014 Elsevier B.V. All rights reserved.

  3. Cloning and expression analysis of GhDET3, a vacuolar H+-ATPase subunit C gene, from cotton

    Institute of Scientific and Technical Information of China (English)

    Zhongyi Xiao; Kunling Tan; Mingyu Hu; Peng Liao; Kuijun Chen; Ming Luo

    2008-01-01

    Vacuolar H+-ATPase was regarded as a key enzyme promoting the fiber cell elongation in cotton (Gossypium hirsuturm L.) through regulating turgot-driven pressure involved in polarity expansion of single cell fiber. The DET3, a V-ATPase subunit C, plays an impor-tant role in assembling subunits and regulating the enzyme activity, and is involved in Brassinosteroid-induced cell elongation. To ana-lyze the function of GhDET3 on the elongation of cotton fibers, seven candidates of ESTs were screened and contigged for a 5'-upstream sequence, and the 3'-RACE technique was used to clone the 3'-downstream sequence for the full length of GhDET3 gene. The full length of the target clone was 1,340 bp, including a 10 bp 5'-UTR, an ORF of 1,134 bp, and a 196 bp 3'-UTR. This cDNA sequence encoded a polypepide of 377 amino acid residues with a predicted molecular mass of 43 kDa and a basic isoelectric point of 5.58. Furthermore, a length of 3,410 bp sequence from genomic DNA of GhDET3 was also cloned by PCR. The deduced amino acid sequence had a high ho-mology with DET3 from Arabidopsis, rice, and maize. Quantitative real-time PCR (qRT-PCR) analysis showed that the GhDET3 expres-sion pattern was ubiquitous in all the tissues and organs detected. The result also revealed that the accumulation of GhDET3 mRNA reached the highest profile at the fiber elongation stage in 12 DPA (days post anthesis) fibers, compared with the lowest level at the fiber initiation stage in 0 DPA ovules (with fibers). The transcript accumulation in fibers and ovules shared the similar variation tendency. In addition, in vitro ovule culture experiment demonstrated that exogenous 24-EBL treatment to 4 DPA ovules (with fibers) was capable of increasing the expression level of GhDET3, and the mRNA accumulation of GhDET3 increased in transgenic FBP7::GhDET2 cotton fibers in vivo. These results indicate that GhDET3 gene plays a crucial role in cotton fiber elongation.

  4. Effect of TNF{alpha} on activities of different promoters of human apolipoprotein A-I gene

    Energy Technology Data Exchange (ETDEWEB)

    Orlov, Sergey V., E-mail: serge@iem.sp.ru [Department of Biochemistry, Institute of Experimental Medicine, Russian Academy of Medical Sciences, 197376 St. Petersburg (Russian Federation); Department of Embryology, St. Petersburg State University, 199034 St. Petersburg (Russian Federation); Mogilenko, Denis A. [Department of Biochemistry, Institute of Experimental Medicine, Russian Academy of Medical Sciences, 197376 St. Petersburg (Russian Federation); Department of Embryology, St. Petersburg State University, 199034 St. Petersburg (Russian Federation); Shavva, Vladimir S. [Department of Embryology, St. Petersburg State University, 199034 St. Petersburg (Russian Federation); Dizhe, Ella B.; Ignatovich, Irina A. [Department of Biochemistry, Institute of Experimental Medicine, Russian Academy of Medical Sciences, 197376 St. Petersburg (Russian Federation); Perevozchikov, Andrej P., E-mail: app@iem.sp.ru [Department of Biochemistry, Institute of Experimental Medicine, Russian Academy of Medical Sciences, 197376 St. Petersburg (Russian Federation); Department of Embryology, St. Petersburg State University, 199034 St. Petersburg (Russian Federation)

    2010-07-23

    Research highlights: {yields} TNF{alpha} stimulates the distal alternative promoter of human apoA-I gene. {yields} TNF{alpha} acts by weakening of promoter competition within apoA-I gene (promoter switching). {yields} MEK1/2 and nuclear receptors PPAR{alpha} and LXRs take part in apoA-I promoter switching. -- Abstract: Human apolipoprotein A-I (ApoA-I) is a major structural and functional protein component of high-density lipoproteins. The expression of the apolipoprotein A-I gene (apoA-I) in hepatocytes is repressed by pro-inflammatory cytokines such as IL-1{beta} and TNF{alpha}. Recently, two novel additional (alternative) promoters for human apoA-I gene have been identified. Nothing is known about the role of alternative promoters in TNF{alpha}-mediated downregulation of apoA-I gene. In this article we report for the first time about the different effects of TNF{alpha} on two alternative promoters of human apoA-I gene. Stimulation of HepG2 cells by TNF{alpha} leads to activation of the distal alternative apoA-I promoter and downregulation of the proximal alternative and the canonical apoA-I promoters. This effect is mediated by weakening of the promoter competition within human apoA-I 5'-regulatory region (apoA-I promoter switching) in the cells treated by TNF{alpha}. The MEK1/2-ERK1/2 cascade and nuclear receptors PPAR{alpha} and LXRs are important for TNF{alpha}-mediated apoA-I promoter switching.

  5. Analysis of the neurofilament heavy subunit (NFH) gene in familial amyotrophic lateral sclerosis

    Energy Technology Data Exchange (ETDEWEB)

    Rooke, K.; Rouleau, G.A. [McGill Univ., Montreal (Canada); Figlewicz, D.A. [Univ. of Rochester Medical Center, NY (United States)

    1994-09-01

    Amyotrophic lateral sclerosis (ALS) is a fatal, adult-onset, degenerative disorder of the motor neurons in the cortex, brainstem and spinal cord. Approximately 10% of ALS cases are familial (FALS) and are inherited as an age-dependent autosomal dominant trait. Mutations in the Cu/Zn superoxide dismutase (SOD-1) gene on chromosome 21 have been found in a subset of cases. However, for the remaining FALS cases, the etiology is unknown. The abnormal accumulation of neurofilaments in the cell body and proximal axon of motor neurons is a characteristic pathological finding in ALS. Furthermore, aberrant neuronal swellings that closely resemble those found in ALS have been reported in transgenic mice overexpressing NFH. The C-terminal region of NFH contains a unique functional domain with multiple repeats of the amino acids (Lys-Ser-Pro) (KSP) and forms the side-arms which appear, at the level of electron microscopy, to cross-link neurofilaments. Recently, deletions in the DSP repeat domain have been identified in five ALS patients diagnosed as sporadic cases of the disease. Based on these findings, we propose to analyze all 4 exons of the NFH gene for variation in FALS. DNA from 110 FALS cases has been amplified by the polymerase chain reaction (PCR) and analyzed by single strand conformation polymorphism (SSCP) analysis. Exon 2, exon 3 and the KSP repeat domain (part of exon 4) appear normal in all our FALS individuals under several different SSCP conditions. The analysis of exon 1 and the remainder of exon 4 has yet to be completed.

  6. Changes in Na+, K+-ATPase activity and alpha 3 subunit expression in CNS after administration of Na+, K+-ATPase inhibitors.

    Science.gov (United States)

    Bersier, María Geraldina; Peña, Clara; Arnaiz, Georgina Rodríguez de Lores

    2011-02-01

    The expression of Na(+), K(+)-ATPase α3 subunit and synaptosomal membrane Na(+), K(+)-ATPase activity were analyzed after administration of ouabain and endobain E, respectively commercial and endogenous Na(+), K(+)-ATPase inhibitors. Wistar rats received intracerebroventricularly ouabain or endobain E dissolved in saline solution or Tris-HCl, respectively or the vehicles (controls). Two days later, animals were decapitated, cerebral cortex and hippocampus removed and crude and synaptosomal membrane fractions were isolated. Western blot analysis showed that Na(+), K(+)-ATPase α3 subunit expression increased roughly 40% after administration of 10 or 100 nmoles ouabain in cerebral cortex but remained unaltered in hippocampus. After administration of 10 μl endobain E (1 μl = 28 mg tissue) Na(+), K(+)-ATPase α3 subunit enhanced 130% in cerebral cortex and 103% in hippocampus. The activity of Na(+), K(+)-ATPase in cortical synaptosomal membranes diminished or increased after administration of ouabain or endobain E, respectively. It is concluded that Na(+), K(+)-ATPase inhibitors modify differentially the expression of Na(+), K(+)-ATPase α3 subunit and enzyme activity, most likely involving compensatory mechanisms.

  7. 牛αS1-酪蛋白基因研究新进展%The Study Progress of Alpha-s1-casein Gene

    Institute of Scientific and Technical Information of China (English)

    田青

    2011-01-01

    Casein is the main component of milk protein,accounts for about 70~80 percent of total protein.as1-casein is the main component of casein,accounting for about 39~46 percent of total milk protein.It is one of the quite active functional genes in the cattle's mammary gland tissue,so it is important and very necessary to study the cow alpha S1-casein gene.The paper summarized the gene structure,genetic diversity and casein active peptide of alpha-s1-casein gene,which would provide the theory basis to study alpha-s1-casein gene deeply and to improve the milk protein content by regulating as1-casein gene.%酪蛋白是牛奶蛋白质的主要组成部分,约占总蛋白的70%~80%,而as1-酪蛋白又是酪蛋白的主要组成部分,约占牛奶总蛋白的39%~46%,是牛乳腺组织中转录相当活跃的一个功能基因,因此研究牛αS1-酪蛋白基因就显得尤为重要而且很有必要。本文从牛as1-酪蛋白基因结构、遗传多态性和酪蛋白活性肽方面做了综述,旨在为以后牛as1-酪蛋白基因的深入研究和通过调控as1-酪蛋白基因而提高牛奶蛋白质的含量提供理论基础。

  8. Cloning and Expression of Luteinizing Hormone Subunits in Chinese Hamster Ovary Cell Line

    Directory of Open Access Journals (Sweden)

    Zeinab Soleimanifar

    2016-10-01

    Full Text Available Background: Luteinizing hormone (LH was secreted by the stimulating cells of the testes and ovaries in the anterior pituitary gland. The application of this hormone is in the treatment of men and women with infertility and amenorrhea respectively.Materials and Methods: In the present study the alpha and beta subunits of human LH gene were cloned into the pEGFP-N1 expression vector and produced the recombinant LH hormone in Chinese hamster ovary (CHO eukaryotic system.Results: Alpha and beta subunits of LH hormone were cloned between NheI and BamHI cut sites of pEGFP_N1 expression plasmid and confirmed by PCR.  Hormone expression was evaluated in CHO cell line by Western blotting using the specific antibody.Conclusion: Alpha and beta subunits of LH hormone were expressed in CHO cell line perfectly.

  9. Detection of the gene encoding the small subunit of the CO dehydrogenase enzyme in the H{sub 2}-evolving bacterium Rubrivivax gelatinosus CBS

    Energy Technology Data Exchange (ETDEWEB)

    Kish, A.; Levin, D. [Victoria Univ., BC (Canada)]|[Victoria Univ., BC (Canada)

    2001-06-01

    A purple non-sulfur bacterium, Rubrivivax gelatinosus CBS presents great opportunities, on a commercial scale, for the biological hydrogen production. A water-gas shift reaction is catalyzed when the bacterium is cultured in the presence of carbon oxide in the dark. The result is carbon monoxide (and water) being shifted into hydrogen (H{sub 2}) and carbon dioxide in near stoichiometric quantities. The production of hydrogen as a clean alternative fuel could be accomplished by using carbon monoxide generated from gasified waste biomass, using the bacterial water-gas shift reaction for that purpose. The characterization of three key enzymes and the genes encoding them was performed in a closely related purple non-sulfur bacterium called Rhodospirillum rubrum. They were: (1) a carbon monoxide dehydrogenase (CODH), (2) the ferredoxin-like electron-carrier small subunit of the CODH enzyme, and (3) an hydrogen-evolving hydrogenase. A transcriptional unit separate from the genes encoding the CODH and its ferredoxin-like small subunit encode the genes for the hydrogenase. A fragment of the Rhodospirillum rubrum ferredoxin-like subunit gene was amplified through the use of a polymerase chain reaction. Southern blots of restriction endonuclease digested genomic deoxyribonucleic acid (DNA) extracted from Rubrivivax gelatinosus CBS was probed with the fragment of the Rhodospirillum rubrum previously amplified using the polymerase chain reaction. Confirmation of the identification is being confirmed, while the gene is sequenced. 25 refs., 2 figs.

  10. Linking supply to demand: the neuronal monocarboxylate transporter MCT2 and the alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionic acid receptor GluR2/3 subunit are associated in a common trafficking process.

    Science.gov (United States)

    Pierre, Karin; Chatton, Jean-Yves; Parent, Annabelle; Repond, Cendrine; Gardoni, Fabrizio; Di Luca, Monica; Pellerin, Luc

    2009-05-01

    MCT2 is the major neuronal monocarboxylate transporter (MCT) that allows the supply of alternative energy substrates such as lactate to neurons. Recent evidence obtained by electron microscopy has demonstrated that MCT2, like alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionic acid (AMPA) receptors, is localized in dendritic spines of glutamatergic synapses. Using immunofluorescence, we show in this study that MCT2 colocalizes extensively with GluR2/3 subunits of AMPA receptors in neurons from various mouse brain regions as well as in cultured neurons. It also colocalizes with GluR2/3-interacting proteins, such as C-kinase-interacting protein 1, glutamate receptor-interacting protein 1 and clathrin adaptor protein. Coimmunoprecipitation of MCT2 with GluR2/3 and C-kinase-interacting protein 1 suggests their close interaction within spines. Parallel changes in the localization of both MCT2 and GluR2/3 subunits at and beneath the plasma membrane upon various stimulation paradigms were unraveled using an original immunocytochemical and transfection approach combined with three-dimensional image reconstruction. Cell culture incubation with AMPA or insulin triggered a marked intracellular accumulation of both MCT2 and GluR2/3, whereas both tumor necrosis factor alpha and glycine (with glutamate) increased their cell surface immunolabeling. Similar results were obtained using Western blots performed on membrane or cytoplasm-enriched cell fractions. Finally, an enhanced lactate flux into neurons was demonstrated after MCT2 translocation on the cell surface. These observations provide unequivocal evidence that MCT2 is linked to AMPA receptor GluR2/3 subunits and undergoes a similar translocation process in neurons upon activation. MCT2 emerges as a novel component of the synaptic machinery putatively linking neuroenergetics to synaptic transmission.

  11. Transcription factors C/EBP-alpha and HNF-1 alpha are associated with decreased expression of liver-specific genes in sepsis

    NARCIS (Netherlands)

    Haaxma, CA; Kim, PK; Andrejko, KM; Raj, NR; Deutschman, CS

    2003-01-01

    Previous studies have demonstrated sepsis-specific changes in the transcription of key hepatic genes. However, the role of hepatic transcription factors in sepsis-associated organ dysfunction has not been well established. We hypothesize that the binding activities of C/EBPalpha and beta, HNF-1alpha

  12. Lymphocyte differentiation in sea bass thymus: CD4 and CD8-alpha gene expression studies.

    Science.gov (United States)

    Picchietti, Simona; Guerra, Laura; Buonocore, Francesco; Randelli, Elisa; Fausto, Anna Maria; Abelli, Luigi

    2009-07-01

    Different developmental stages (from eggs to 1-year-old juveniles) of the teleost fish Dicentrarchus labrax (L.) were assayed for CD4 gene expression. RT-PCR revealed the appearance of CD4 transcripts in post-larvae from 51 days post-hatching (dph). This finding overlaps the first detection of CD8-alpha mRNA. Real-time PCR with specific primers quantified CD4, CD8-alpha and TCR-beta transcripts in larvae and post-larvae (25, 51, 75 and 92 dph) and 1-year-old thymus. At 92 dph, TcR-beta and CD8-alpha transcripts were significantly higher (P overlap, except in the medulla, where CD4(+) thymocytes were isolated, while CD8-alpha(+) ones mainly arranged in cords. These results provide new information about the thymic compartmentalization and lymphocyte differentiation pathways in a teleost, almost demonstrating that double negative thymocytes fill the cortex giving rise to further selection in the medulla.

  13. IDENTIFICATION OF 3 HUMAN PSEUDOGENES FOR SUBUNIT-VIB OF CYTOCHROME-C-OXIDASE - A MOLECULAR RECORD OF GENE EVOLUTION

    NARCIS (Netherlands)

    TAANMAN, JW; SCHRAGE, C; REUVEKAMP, P; BIJL, J; HARTOG, M; DEVRIES, H; AGSTERIBBE, E

    1991-01-01

    Three pseudogenes for the nuclear-encoded subunit VIb of cytochrome c oxidase (COX) were isolated by screening a human genomic library with cloned human cDNA coding for COX subunit VIb. The nucleotide sequences of the pseudogenes, designated PSI-COX6b-1, PSI-COX6b-2 and PSI-COX6b-3, were determined.

  14. IDENTIFICATION OF 3 HUMAN PSEUDOGENES FOR SUBUNIT-VIB OF CYTOCHROME-C-OXIDASE - A MOLECULAR RECORD OF GENE EVOLUTION

    NARCIS (Netherlands)

    TAANMAN, JW; SCHRAGE, C; REUVEKAMP, P; BIJL, J; HARTOG, M; DEVRIES, H; AGSTERIBBE, E

    1991-01-01

    Three pseudogenes for the nuclear-encoded subunit VIb of cytochrome c oxidase (COX) were isolated by screening a human genomic library with cloned human cDNA coding for COX subunit VIb. The nucleotide sequences of the pseudogenes, designated PSI-COX6b-1, PSI-COX6b-2 and PSI-COX6b-3, were determined.

  15. SDF1 gene variation is associated with circulating SDF1alpha level and endothelial progenitor cell number: the Bruneck Study.

    Directory of Open Access Journals (Sweden)

    Qingzhong Xiao

    Full Text Available BACKGROUND: Stromal cell-derived factor-1 (SDF1 and its receptor CXC chemokine receptor 4 (CXCR4 play a critical role in progenitor cell homing, mobilization and differentiation. It would be interesting to assess the predictive value of SDF-1alpha level for EPC number, and to ascertain whether there is a relationship between SDF1 gene variation, plasma SDF-1alpha level, and the number and function of circulating EPCs. We also tested whether EPC number and function was related to CXCR4 gene variation. METHODOLOGY AND PRINCIPAL FINDINGS: We genotyped a cohort of individuals who participated in the Bruneck Study for single nucleotide polymorphisms (SNPs in the SDF1 and CXCR4 genes, and measured blood SDF1alpha level as well as EPC number and function. SDF1alpha levels were correlated with age, gender, alcohol consumption, circulating reticulocyte numbers, and concentrations of matrix metalloproteinase-9, C-reactive protein, cystatin C, fibrinogen and homocytein. In blood samples taken in 2005, EPC number was inversely associated with SDF1alpha level (p<0.001. EPC number in 2005 was also inversely associated with SDF1alpha level in 2000 (p = 0.009, suggesting a predictive value of plasma SDF1alpha level for EPC number. There was an association between the SDF1 gene rs2297630 SNP A/A genotype, increased SDF1alpha level (p = 0.002 and lower EPC number (p = 0.006. CONCLUSIONS: Our data indicate that a SDF1 gene variation (rs2297630 has an influence on SDF1alpha level and circulating EPC number, and that plasma SDF1alpha level is a predictor of EPC number.

  16. Molecular cloning and functional characterization of two novel high molecular weight glutenin subunit genes in Aegilops markgrafii

    Indian Academy of Sciences (India)

    XUYE DU; XIAOCUN ZHANG

    2017-09-01

    The high molecular weight glutenin subunits (HMW-GS) in bread wheat are major determinants of the viscoelastic properties of dough and the end-use quality of wheat flour. Two novel HMW-GSs, 1Cx1.1 and 1Cy9.1, from the diploid speciesAegilops markgrafii (CC) were identified in the present study. The corresponding open-reading frames of the genes of 1Cx1.1 and 1Cy9.1 were isolated and sequenced using allele-specific polymerase chain reaction. Sequence comparison demonstrated that the HMW-GSs from Ae. markgrafii possess a similar primary structure to the homologous proteins in wheat and related species. A tandem tripeptide exists in the central repetitive domain of 1Cx1.1, and this unique structure is very rare in the HMW-GSs of other genomes. To confirm the authenticity of these isolated endogenous HMW-GS, the heterologous proteins produced by removing the signal peptides expressed by E. coli exhibited the same electrophoretic mobility as the native proteins. Subsequently, the singleprotein was purified at a sufficient scale for incorporation into flour to performsodium dodecyl sulphate (SDS) sedimentation testing. Notably, the SDS sedimentation volume was less with the addition of 1Cx1.1 than it was with 1Cy9.1.

  17. Mutations in Two Genes Encoding Different Subunits of a Receptor Signaling Complex Result in an Identical Disease Phenotype

    Science.gov (United States)

    Paloneva, Juha; Manninen, Tuula; Christman, Grant; Hovanes, Karine; Mandelin, Jami; Adolfsson, Rolf; Bianchin, Marino; Bird, Thomas; Miranda, Roxana; Salmaggi, Andrea; Tranebjærg, Lisbeth; Konttinen, Yrjö; Peltonen, Leena

    2002-01-01

    Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy (PLOSL), also known as “Nasu-Hakola disease,” is a globally distributed recessively inherited disease leading to death during the 5th decade of life and is characterized by early-onset progressive dementia and bone cysts. Elsewhere, we have identified PLOSL mutations in TYROBP (DAP12), which codes for a membrane receptor component in natural-killer and myeloid cells, and also have identified genetic heterogeneity in PLOSL, with some patients carrying no mutations in TYROBP. Here we complete the molecular pathology of PLOSL by identifying TREM2 as the second PLOSL gene. TREM2 forms a receptor signaling complex with TYROBP and triggers activation of the immune responses in macrophages and dendritic cells. Patients with PLOSL have no defects in cell-mediated immunity, suggesting a remarkable capacity of the human immune system to compensate for the inactive TYROBP-mediated activation pathway. Our data imply that the TYROBP-mediated signaling pathway plays a significant role in human brain and bone tissue and provide an interesting example of how mutations in two different subunits of a multisubunit receptor complex result in an identical human disease phenotype. PMID:12080485

  18. Prevalent ciliate symbiosis on copepods: high genetic diversity and wide distribution detected using small subunit ribosomal RNA gene.

    Science.gov (United States)

    Guo, Zhiling; Liu, Sheng; Hu, Simin; Li, Tao; Huang, Yousong; Liu, Guangxing; Zhang, Huan; Lin, Senjie

    2012-01-01

    Toward understanding the genetic diversity and distribution of copepod-associated symbiotic ciliates and the evolutionary relationships with their hosts in the marine environment, we developed a small subunit ribosomal RNA gene (18S rDNA)-based molecular method and investigated the genetic diversity and genotype distribution of the symbiotic ciliates on copepods. Of the 10 copepod species representing six families collected from six locations of Pacific and Atlantic Oceans, 9 were found to harbor ciliate symbionts. Phylogenetic analysis of the 391 ciliate 18S rDNA sequences obtained revealed seven groups (ribogroups), six (containing 99% of all the sequences) belonging to subclass Apostomatida, the other clustered with peritrich ciliate Vorticella gracilis. Among the Apostomatida groups, Group III were essentially identical to Vampyrophrya pelagica, and the other five groups represented the undocumented ciliates that were close to Vampyrophrya/Gymnodinioides/Hyalophysa. Group VI ciliates were found in all copepod species but one (Calanus sinicus), and were most abundant among all ciliate sequences obtained, indicating that they are the dominant symbiotic ciliates universally associated with copepods. In contrast, some ciliate sequences were found only in some of the copepods examined,