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  • 1998  (36)
  • 1
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    Budding yeast Cdc20: a target of the spindle checkpoint (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-03-07
    Description: The spindle checkpoint regulates the cell division cycle by keeping cells with defective spindles from leaving mitosis. In the two-hybrid system, three proteins that are components of the checkpoint, Mad1, Mad2, and Mad3, were shown to interact with Cdc20, a protein required for exit from mitosis. Mad2 and Mad3 coprecipitated with Cdc20 at all stages of the cell cycle. The binding of Mad2 depended on Mad1 and that of Mad3 on Mad1 and Mad2. Overexpression of Cdc20 allowed cells with a depolymerized spindle or damaged DNA to leave mitosis but did not overcome the arrest caused by unreplicated DNA. Mutants in Cdc20 that were resistant to the spindle checkpoint no longer bound Mad proteins, suggesting that Cdc20 is the target of the spindle checkpoint.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, L H -- Lau, L F -- Smith, D L -- Mistrot, C A -- Hardwick, K G -- Hwang, E S -- Amon, A -- Murray, A W -- New York, N.Y. -- Science. 1998 Feb 13;279(5353):1041-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of California at San Francisco, San Francisco, CA 94143-0444, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9461437" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anaphase ; Anaphase-Promoting Complex-Cyclosome ; Cadherins ; Calcium-Binding Proteins/metabolism ; *Carrier Proteins ; Cdc20 Proteins ; Cdh1 Proteins ; Cell Cycle Proteins/chemistry/genetics/*metabolism ; DNA Damage ; DNA Replication ; Fungal Proteins/chemistry/*metabolism ; Ligases/metabolism ; Mad2 Proteins ; *Mitosis ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/metabolism ; Phosphoproteins/metabolism ; *Repressor Proteins ; Saccharomyces cerevisiae/*cytology/*metabolism ; *Saccharomyces cerevisiae Proteins ; Spindle Apparatus/*metabolism ; *Ubiquitin-Protein Ligase Complexes ; Ubiquitin-Protein Ligases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Structural basis of plasticity in T cell receptor recognition of a self peptide-MHC antigen (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-03-21
    Description: The T cell receptor (TCR) inherently has dual specificity. T cells must recognize self-antigens in the thymus during maturation and then discriminate between foreign pathogens in the periphery. A molecular basis for this cross-reactivity is elucidated by the crystal structure of the alloreactive 2C TCR bound to self peptide-major histocompatibility complex (pMHC) antigen H-2Kb-dEV8 refined against anisotropic 3.0 angstrom resolution x-ray data. The interface between peptide and TCR exhibits extremely poor shape complementarity, and the TCR beta chain complementarity-determining region 3 (CDR3) has minimal interaction with the dEV8 peptide. Large conformational changes in three of the TCR CDR loops are induced upon binding, providing a mechanism of structural plasticity to accommodate a variety of different peptide antigens. Extensive TCR interaction with the pMHC alpha helices suggests a generalized orientation that is mediated by the Valpha domain of the TCR and rationalizes how TCRs can effectively "scan" different peptides bound within a large, low-affinity MHC structural framework for those that provide the slight additional kinetic stabilization required for signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia, K C -- Degano, M -- Pease, L R -- Huang, M -- Peterson, P A -- Teyton, L -- Wilson, I A -- AI42266/AI/NIAID NIH HHS/ -- AI42267/AI/NIAID NIH HHS/ -- R01 CA58896/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1998 Feb 20;279(5354):1166-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9469799" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Crystallization ; Crystallography, X-Ray ; H-2 Antigens/*chemistry/*immunology/metabolism ; Ligands ; Mice ; Mice, Transgenic ; Models, Molecular ; Mutation ; Oligopeptides/*chemistry/immunology/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Receptors, Antigen, T-Cell, alpha-beta/*chemistry/*immunology/metabolism ; Recombinant Proteins
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    An essential role for ectodomain shedding in mammalian development (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-11-13
    Description: The ectodomains of numerous proteins are released from cells by proteolysis to yield soluble intercellular regulators. The responsible protease, tumor necrosis factor-alpha converting enzyme (TACE), has been identified only in the case when tumor necrosis factor-alpha (TNFalpha) is released. Analyses of cells lacking this metalloproteinase-disintegrin revealed an expanded role for TACE in the processing of other cell surface proteins, including a TNF receptor, the L-selectin adhesion molecule, and transforming growth factor-alpha (TGFalpha). The phenotype of mice lacking TACE suggests an essential role for soluble TGFalpha in normal development and emphasizes the importance of protein ectodomain shedding in vivo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peschon, J J -- Slack, J L -- Reddy, P -- Stocking, K L -- Sunnarborg, S W -- Lee, D C -- Russell, W E -- Castner, B J -- Johnson, R S -- Fitzner, J N -- Boyce, R W -- Nelson, N -- Kozlosky, C J -- Wolfson, M F -- Rauch, C T -- Cerretti, D P -- Paxton, R J -- March, C J -- Black, R A -- CA43793/CA/NCI NIH HHS/ -- DK53804/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1998 Nov 13;282(5392):1281-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immunex Corporation, Seattle, WA 98101, USA. peschon@immunex.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9812885" target="_blank"〉PubMed〈/a〉
    Keywords: ADAM Proteins ; Amino Acid Sequence ; Animals ; Catalytic Domain ; Cell Membrane/*metabolism ; Cells, Cultured ; Crosses, Genetic ; *Embryonic and Fetal Development ; L-Selectin/metabolism ; Ligands ; Membrane Proteins/*metabolism ; Metalloendopeptidases/chemistry/genetics/*metabolism ; Mice ; Mice, Inbred C57BL ; Molecular Sequence Data ; Mutation ; Phenotype ; Protein Processing, Post-Translational ; Receptors, Tumor Necrosis Factor/metabolism ; Transforming Growth Factor alpha/metabolism ; Tumor Necrosis Factor-alpha/*metabolism
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Regulation of meiotic S phase by Ime2 and a Clb5,6-associated kinase in Saccharomyces cerevisiae (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-22
    Description: Cyclin-dependent kinase (Cdk) mutations that prevent entry into the mitotic cell cycle of budding yeast fail to block meiotic DNA replication, suggesting there may be fundamental differences between these pathways. However, S phase in meiosis was found to depend on the same B-type cyclins (Clb5 and Clb6) as it does in mitosis. Meiosis differs instead in the mechanism that controls removal of the Cdk inhibitor Sic1. Destruction of Sic1 and activation of a Clb5-dependent kinase in meiotic cells required the action of the meiosis-specific protein kinase Ime2, thereby coupling early meiotic gene expression to control of DNA replication for meiosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dirick, L -- Goetsch, L -- Ammerer, G -- Byers, B -- GM 18541/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1854-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Box 357360, University of Washington, Seattle, WA 98195-7360, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9743499" target="_blank"〉PubMed〈/a〉
    Keywords: CDC28 Protein Kinase, S cerevisiae/metabolism ; *Cell Cycle Proteins ; *Cyclin B ; Cyclin-Dependent Kinase Inhibitor Proteins ; Cyclin-Dependent Kinases/*metabolism ; Cyclins/genetics/*metabolism ; DNA Replication ; Enzyme Inhibitors/metabolism ; Fungal Proteins/genetics/*metabolism ; Genes, Fungal ; Intracellular Signaling Peptides and Proteins ; *Meiosis ; Mutation ; Protein Kinases/genetics/*metabolism ; Protein-Serine-Threonine Kinases ; *S Phase ; Saccharomyces cerevisiae/*cytology/genetics/metabolism ; *Saccharomyces cerevisiae Proteins
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  • 5
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    Transcription regulation by initiating NTP concentration: rRNA synthesis in bacteria (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-02-12
    Description: The sequence of a promoter determines not only the efficiency with which it forms a complex with RNA polymerase, but also the concentration of nucleoside triphosphate (NTP) required for initiating transcription. Escherichia coli ribosomal RNA (rrn P1) promoters require high initiating NTP concentrations for efficient transcription because they form unusually short-lived complexes with RNA polymerase; high initiating NTP concentrations [adenosine or guanosine triphosphate (ATP or GTP), depending on the rrn P1 promoter] are needed to bind to and stabilize the open complex. ATP and GTP concentrations, and therefore rrn P1 promoter activity, increase with growth rate. Because ribosomal RNA transcription determines the rate of ribosome synthesis, the control of ribosomal RNA transcription by NTP concentration provides a molecular explanation for the growth rate-dependent control and homeostatic regulation of ribosome synthesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gaal, T -- Bartlett, M S -- Ross, W -- Turnbough, C L Jr -- Gourse, R L -- GM29466/GM/NIGMS NIH HHS/ -- GM37048/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Dec 19;278(5346):2092-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, University of Wisconsin, 1550 Linden Drive, Madison, WI 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9405339" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/*metabolism ; Escherichia coli/*genetics/growth & development/metabolism ; Gene Expression Regulation, Bacterial ; Guanosine Triphosphate/*metabolism ; Half-Life ; Homeostasis ; Models, Genetic ; Mutation ; Protein Biosynthesis ; RNA, Bacterial/biosynthesis/genetics ; RNA, Ribosomal/*biosynthesis/genetics ; *Transcription, Genetic ; *rRNA Operon
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  • 6
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    Enhanced phosphorylation of p53 by ATM in response to DNA damage (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-11
    Description: The ATM protein, encoded by the gene responsible for the human genetic disorder ataxia telangiectasia (A-T), regulates several cellular responses to DNA breaks. ATM shares a phosphoinositide 3-kinase-related domain with several proteins, some of them protein kinases. A wortmannin-sensitive protein kinase activity was associated with endogenous or recombinant ATM and was abolished by structural ATM mutations. In vitro substrates included the translation repressor PHAS-I and the p53 protein. ATM phosphorylated p53 in vitro on a single residue, serine-15, which is phosphorylated in vivo in response to DNA damage. This activity was markedly enhanced within minutes after treatment of cells with a radiomimetic drug; the total amount of ATM remained unchanged. Various damage-induced responses may be activated by enhancement of the protein kinase activity of ATM.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Banin, S -- Moyal, L -- Shieh, S -- Taya, Y -- Anderson, C W -- Chessa, L -- Smorodinsky, N I -- Prives, C -- Reiss, Y -- Shiloh, Y -- Ziv, Y -- NS31763/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 11;281(5383):1674-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9733514" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Androstadienes/pharmacology ; Ataxia Telangiectasia/metabolism ; Ataxia Telangiectasia Mutated Proteins ; *Carrier Proteins ; Cell Cycle Proteins ; Cell Line ; *DNA Damage ; DNA-Binding Proteins ; Enzyme Inhibitors/pharmacology ; Humans ; Mutation ; Phosphatidylinositol 3-Kinases/chemistry ; Phosphoproteins/metabolism ; Phosphorylation ; Protein Kinase Inhibitors ; Protein Kinases/chemistry/*metabolism ; *Protein-Serine-Threonine Kinases ; Proteins/antagonists & inhibitors/chemistry/genetics/*metabolism ; Recombinant Proteins/metabolism ; Tumor Cells, Cultured ; Tumor Suppressor Protein p53/*metabolism ; Tumor Suppressor Proteins ; Zinostatin/pharmacology
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  • 7
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    Identification of c-MYC as a target of the APC pathway (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-04
    Description: The adenomatous polyposis coli gene (APC) is a tumor suppressor gene that is inactivated in most colorectal cancers. Mutations of APC cause aberrant accumulation of beta-catenin, which then binds T cell factor-4 (Tcf-4), causing increased transcriptional activation of unknown genes. Here, the c-MYC oncogene is identified as a target gene in this signaling pathway. Expression of c-MYC was shown to be repressed by wild-type APC and activated by beta-catenin, and these effects were mediated through Tcf-4 binding sites in the c-MYC promoter. These results provide a molecular framework for understanding the previously enigmatic overexpression of c-MYC in colorectal cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, T C -- Sparks, A B -- Rago, C -- Hermeking, H -- Zawel, L -- da Costa, L T -- Morin, P J -- Vogelstein, B -- Kinzler, K W -- CA57345/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- GM07309/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 4;281(5382):1509-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Johns Hopkins Oncology Center, 424 North Bond Street, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9727977" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Binding Sites ; Cell Line ; Colorectal Neoplasms/*genetics ; Cytoskeletal Proteins/genetics/metabolism ; *Gene Expression Regulation, Neoplastic ; *Genes, APC ; Genes, Reporter ; *Genes, myc ; HT29 Cells ; Humans ; Mutation ; Promoter Regions, Genetic ; Proto-Oncogene Proteins c-myc/metabolism ; Signal Transduction ; TCF Transcription Factors ; *Trans-Activators ; Transcription Factor 7-Like 2 Protein ; Transcription Factors/metabolism ; Transcription, Genetic ; beta Catenin
    Print ISSN: 0036-8075
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  • 8
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    Molecular basis for interactions of G protein betagamma subunits with effectors (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-20
    Description: Both the alpha and betagamma subunits of heterotrimeric guanine nucleotide-binding proteins (G proteins) communicate signals from receptors to effectors. Gbetagamma subunits can regulate a diverse array of effectors, including ion channels and enzymes. Galpha subunits bound to guanine diphosphate (Galpha-GDP) inhibit signal transduction through Gbetagamma subunits, suggesting a common interface on Gbetagamma subunits for Galpha binding and effector interaction. The molecular basis for interaction of Gbetagamma with effectors was characterized by mutational analysis of Gbeta residues that make contact with Galpha-GDP. Analysis of the ability of these mutants to regulate the activity of calcium and potassium channels, adenylyl cyclase 2, phospholipase C-beta2, and beta-adrenergic receptor kinase revealed the Gbeta residues required for activation of each effector and provides evidence for partially overlapping domains on Gbeta for regulation of these effectors. This organization of interaction regions on Gbeta for different effectors and Galpha explains why subunit dissociation is crucial for signal transmission through Gbetagamma subunits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ford, C E -- Skiba, N P -- Bae, H -- Daaka, Y -- Reuveny, E -- Shekter, L R -- Rosal, R -- Weng, G -- Yang, C S -- Iyengar, R -- Miller, R J -- Jan, L Y -- Lefkowitz, R J -- Hamm, H E -- DA02121/DA/NIDA NIH HHS/ -- DA02575/DA/NIDA NIH HHS/ -- MH40165/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1998 May 22;280(5367):1271-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Neuroscience and Department of Molecular Pharmacology and Biological Chemistry, Northwestern University, Chicago, IL 60611, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596582" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate Ribose/metabolism ; Adenylyl Cyclases/metabolism ; Binding Sites ; Calcium Channels/metabolism ; Cell Line ; Cyclic AMP-Dependent Protein Kinases/metabolism ; G Protein-Coupled Inwardly-Rectifying Potassium Channels ; GTP-Binding Proteins/*chemistry/*metabolism ; Guanosine Diphosphate/metabolism ; *Heterotrimeric GTP-Binding Proteins ; Humans ; Isoenzymes/metabolism ; Models, Molecular ; Mutation ; Phospholipase C beta ; Potassium Channels/metabolism ; *Potassium Channels, Inwardly Rectifying ; Protein Conformation ; Rhodopsin/pharmacology ; *Signal Transduction ; Transducin/metabolism ; Type C Phospholipases/metabolism ; beta-Adrenergic Receptor Kinases
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  • 9
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    Aggregation and motor neuron toxicity of an ALS-linked SOD1 mutant independent from wild-type SOD1 (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-22
    Description: Analysis of transgenic mice expressing familial amyotrophic lateral sclerosis (ALS)-linked mutations in the enzyme superoxide dismutase (SOD1) have shown that motor neuron death arises from a mutant-mediated toxic property or properties. In testing the disease mechanism, both elimination and elevation of wild-type SOD1 were found to have no effect on mutant-mediated disease, which demonstrates that the use of SOD mimetics is unlikely to be an effective therapy and raises the question of whether toxicity arises from superoxide-mediated oxidative stress. Aggregates containing SOD1 were common to disease caused by different mutants, implying that coaggregation of an unidentified essential component or components or aberrant catalysis by misfolded mutants underlies a portion of mutant-mediated toxicity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bruijn, L I -- Houseweart, M K -- Kato, S -- Anderson, K L -- Anderson, S D -- Ohama, E -- Reaume, A G -- Scott, R W -- Cleveland, D W -- NS 27036/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1851-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ludwig Institute for Cancer Research and Departments of Medicine and Neuroscience, University of California, La Jolla, CA 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9743498" target="_blank"〉PubMed〈/a〉
    Keywords: Amyotrophic Lateral Sclerosis/*enzymology/genetics/pathology ; Animals ; Astrocytes/enzymology/ultrastructure ; Disease Progression ; Female ; Humans ; Hydrogen Peroxide/metabolism ; Inclusion Bodies/enzymology/ultrastructure ; Male ; Mice ; Mice, Transgenic ; Motor Neurons/enzymology/*pathology ; Mutation ; *Nerve Degeneration ; Oxidative Stress ; Superoxide Dismutase/genetics/*metabolism ; Superoxides/metabolism
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  • 10
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    Disruption of a neuropeptide gene, flp-1, causes multiple behavioral defects in Caenorhabditis elegans (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-11
    Description: Neuropeptides serve as important signaling molecules in the nervous system. The FMRFamide (Phe-Met-Arg-Phe-amide)-related neuropeptide gene family in the nematode Caenorhabditis elegans is composed of at least 18 genes that may encode 53 distinct FMRFamide-related peptides. Disruption of one of these genes, flp-1, causes numerous behavioral defects, including uncoordination, hyperactivity, and insensitivity to high osmolarity. Conversely, overexpression of flp-1 results in the reciprocal phenotypes. On the basis of epistasis analysis, flp-1 gene products appear to signal upstream of a G protein-coupled second messenger system. These results demonstrate that varying the levels of FLP-1 neuropeptides can profoundly affect behavior and that members of this large neuropeptide gene family are not functionally redundant in C. elegans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, L S -- Rosoff, M L -- Li, C -- AG00708/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 11;281(5383):1686-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Boston University, 5 Cummington Street, Boston, MA 02215, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9733518" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/genetics/*physiology ; *Caenorhabditis elegans Proteins ; FMRFamide ; GTP-Binding Proteins/genetics/physiology ; *Genes, Helminth ; Helminth Proteins/genetics/physiology ; Motor Activity ; Movement ; Mutation ; Neuropeptides/*genetics/*physiology ; Osmolar Concentration ; Phenotype ; Polymerase Chain Reaction ; Sequence Deletion ; Serotonin/pharmacology/physiology ; Signal Transduction ; Transgenes
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