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  • Articles  (40)
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  • American Association for the Advancement of Science (AAAS)  (40)
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  • 1995-1999  (40)
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  • 1999  (25)
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  • Articles  (40)
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  • American Association for the Advancement of Science (AAAS)  (40)
  • American Chemical Society
  • American Institute of Physics (AIP)
  • Oxford University Press
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  • 1
    Publication Date: 1999-06-26
    Description: Motilin is a 22-amino acid peptide hormone expressed throughout the gastrointestinal (GI) tract of humans and other species. It affects gastric motility by stimulating interdigestive antrum and duodenal contractions. A heterotrimeric guanosine triphosphate-binding protein (G protein)-coupled receptor for motilin was isolated from human stomach, and its amino acid sequence was found to be 52 percent identical to the human receptor for growth hormone secretagogues. The macrolide antibiotic erythromycin also interacted with the cloned motilin receptor, providing a molecular basis for its effects on the human GI tract. The motilin receptor is expressed in enteric neurons of the human duodenum and colon. Development of motilin receptor agonists and antagonists may be useful in the treatment of multiple disorders of GI motility.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feighner, S D -- Tan, C P -- McKee, K K -- Palyha, O C -- Hreniuk, D L -- Pong, S S -- Austin, C P -- Figueroa, D -- MacNeil, D -- Cascieri, M A -- Nargund, R -- Bakshi, R -- Abramovitz, M -- Stocco, R -- Kargman, S -- O'Neill, G -- Van Der Ploeg, L H -- Evans, J -- Patchett, A A -- Smith, R G -- Howard, A D -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2184-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Metabolic Disorders, Department of Medicinal Chemistry, Merck Research Laboratories, Building RY-80Y-265, 126 East Lincoln Avenue, Rahway, NJ 07065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381885" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing ; Amino Acid Sequence ; Base Sequence ; Binding Sites ; Calcium/metabolism ; Cell Line ; Chromosome Mapping ; Chromosomes, Human, Pair 13 ; Cloning, Molecular ; Colon/*metabolism ; Erythromycin/metabolism ; GTP-Binding Proteins/metabolism ; Humans ; In Situ Hybridization ; Intestine, Small/*metabolism ; Ligands ; Molecular Sequence Data ; Motilin/analogs & derivatives/*metabolism ; Receptors, Gastrointestinal Hormone/*chemistry/*genetics/metabolism ; Receptors, Neuropeptide/*chemistry/*genetics/metabolism ; Stomach/*metabolism ; Thyroid Gland/metabolism ; Transfection
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  • 2
    Publication Date: 1999-05-21
    Description: Bile acids regulate the transcription of genes that control cholesterol homeostasis through molecular mechanisms that are poorly understood. Physiological concentrations of free and conjugated chenodeoxycholic acid, lithocholic acid, and deoxycholic acid activated the farnesoid X receptor (FXR; NR1H4), an orphan nuclear receptor. As ligands, these bile acids and their conjugates modulated interaction of FXR with a peptide derived from steroid receptor coactivator 1. These results provide evidence for a nuclear bile acid signaling pathway that may regulate cholesterol homeostasis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parks, D J -- Blanchard, S G -- Bledsoe, R K -- Chandra, G -- Consler, T G -- Kliewer, S A -- Stimmel, J B -- Willson, T M -- Zavacki, A M -- Moore, D D -- Lehmann, J M -- F32 DK09793/DK/NIDDK NIH HHS/ -- R01 DK53366/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1999 May 21;284(5418):1365-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biochemistry, Glaxo Wellcome Research and Development, Research Triangle Park NC, 27709, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334993" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bile Acids and Salts/chemistry/*metabolism/pharmacology ; Carrier Proteins/metabolism ; Cell Line ; Chenodeoxycholic Acid/*metabolism/pharmacology ; Cholesterol/metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Deoxycholic Acid/metabolism/pharmacology ; Histone Acetyltransferases ; Homeostasis ; Humans ; Ligands ; Lithocholic Acid/metabolism/pharmacology ; Mice ; Nuclear Receptor Coactivator 1 ; *Organic Anion Transporters, Sodium-Dependent ; Protein Conformation ; Receptors, Cytoplasmic and Nuclear/chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Structure-Activity Relationship ; *Symporters ; Transcription Factors/chemistry/genetics/*metabolism ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 1999-04-30
    Description: The PDZ protein interaction domain of neuronal nitric oxide synthase (nNOS) can heterodimerize with the PDZ domains of postsynaptic density protein 95 and syntrophin through interactions that are not mediated by recognition of a typical carboxyl-terminal motif. The nNOS-syntrophin PDZ complex structure revealed that the domains interact in an unusual linear head-to-tail arrangement. The nNOS PDZ domain has two opposite interaction surfaces-one face has the canonical peptide binding groove, whereas the other has a beta-hairpin "finger." This nNOS beta finger docks in the syntrophin peptide binding groove, mimicking a peptide ligand, except that a sharp beta turn replaces the normally required carboxyl terminus. This structure explains how PDZ domains can participate in diverse interaction modes to assemble protein networks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hillier, B J -- Christopherson, K S -- Prehoda, K E -- Bredt, D S -- Lim, W A -- New York, N.Y. -- Science. 1999 Apr 30;284(5415):812-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10221915" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Crystallography, X-Ray ; Dimerization ; *Dystrophin-Associated Proteins ; Ligands ; Membrane Proteins/*chemistry/metabolism ; Molecular Sequence Data ; Muscle Proteins/*chemistry/metabolism ; Nitric Oxide Synthase/*chemistry/metabolism ; Nitric Oxide Synthase Type I ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Signal Transduction
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  • 4
    Publication Date: 1999-07-10
    Description: The specialized junction between a T lymphocyte and an antigen-presenting cell, the immunological synapse, consists of a central cluster of T cell receptors surrounded by a ring of adhesion molecules. Immunological synapse formation is now shown to be an active and dynamic mechanism that allows T cells to distinguish potential antigenic ligands. Initially, T cell receptor ligands were engaged in an outermost ring of the nascent synapse. Transport of these complexes into the central cluster was dependent on T cell receptor-ligand interaction kinetics. Finally, formation of a stable central cluster at the heart of the synapse was a determinative event for T cell proliferation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grakoui, A -- Bromley, S K -- Sumen, C -- Davis, M M -- Shaw, A S -- Allen, P M -- Dustin, M L -- New York, N.Y. -- Science. 1999 Jul 9;285(5425):221-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Immunology and the Department of Pathology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10398592" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Presenting Cells/immunology/metabolism ; Antigens, CD4/immunology/metabolism ; CHO Cells ; Cell Movement ; Cricetinae ; Cytochrome c Group/immunology/metabolism ; Fluorescence ; Histocompatibility Antigens/immunology/*metabolism ; Intercellular Adhesion Molecule-1/immunology/metabolism ; Ligands ; Lipid Bilayers ; *Lymphocyte Activation ; Mice ; Mice, Transgenic ; Microscopy, Interference ; Models, Immunological ; Peptides/immunology/metabolism ; Receptors, Antigen, T-Cell/immunology/*metabolism ; Signal Transduction ; T-Lymphocytes/*immunology/metabolism ; Time Factors
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 1996-11-22
    Description: The Caenorhabditis elegans dauer larva is specialized for dispersal without growth and is formed under conditions of overcrowding and limited food. The daf-7 gene, required for transducing environmental cues that support continuous development with plentiful food, encodes a transforming growth factor-beta (TGF-beta) superfamily member. A daf-7 reporter construct is expressed in the ASI chemosensory neurons. Dauer-inducing pheromone inhibits daf-7 expression and promotes dauer formation, whereas food reactivates daf-7 expression and promotes recovery from the dauer state. When the food/pheromone ratio is high, the level of daf-7 mRNA peaks during the L1 larval stage, when commitment to non-dauer development is made.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ren, P -- Lim, C S -- Johnsen, R -- Albert, P S -- Pilgrim, D -- Riddle, D L -- HD11239/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1996 Nov 22;274(5291):1389-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Program and Division of Biological Sciences, 311 Tucker Hall, University of Missouri, Columbia, MO 65211, USA. riddle@biosci.mbp.missouri.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8910282" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Animals, Genetically Modified ; Caenorhabditis elegans/genetics/*growth & development/metabolism ; *Caenorhabditis elegans Proteins ; Genes, Helminth ; Genes, Reporter ; Green Fluorescent Proteins ; Helminth Proteins/chemistry/genetics/*physiology ; Humans ; Larva/growth & development/metabolism ; Ligands ; Luminescent Proteins/genetics ; Molecular Sequence Data ; Mutation ; Neurons, Afferent/*metabolism ; Phenotype ; Pheromones/pharmacology ; Temperature ; Transforming Growth Factor beta/chemistry/genetics/*physiology ; Transgenes
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  • 6
    Publication Date: 1996-09-13
    Description: Integrin function is central to inflammation, immunity, and tumor progression. The urokinase-type plasminogen activator receptor (uPAR) and integrins formed stable complexes that both inhibited native integrin adhesive function and promoted adhesion to vitronectin via a ligand binding site on uPAR. Interaction of soluble uPAR with the active conformer of integrins mimicked the inhibitory effects of membrane uPAR. Both uPAR-mediated adhesion and altered integrin function were blocked by a peptide that bound to uPAR and disrupted complexes. These data provide a paradigm for regulation of integrins in which a nonintegrin membrane receptor interacts with and modifies the function of activated integrins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wei, Y -- Lukashev, M -- Simon, D I -- Bodary, S C -- Rosenberg, S -- Doyle, M V -- Chapman, H A -- HD 26732/HD/NICHD NIH HHS/ -- HL 02768/HL/NHLBI NIH HHS/ -- HL44712/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1996 Sep 13;273(5281):1551-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8703217" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antigens, CD18/metabolism ; Antigens, CD29/metabolism ; *Cell Adhesion ; Cell Line ; Fibronectins/metabolism ; Glycosylphosphatidylinositols/metabolism ; Humans ; Integrins/metabolism/*physiology ; Ligands ; Molecular Sequence Data ; Receptors, Cell Surface/*metabolism ; Receptors, Cytoadhesin/*metabolism ; Receptors, Urokinase Plasminogen Activator ; Recombinant Fusion Proteins/metabolism ; Transfection ; Urokinase-Type Plasminogen Activator/metabolism ; Vitronectin/metabolism
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  • 7
    Publication Date: 1999-10-09
    Description: The Yersinia pseudotuberculosis invasin protein promotes bacterial entry by binding to host cell integrins with higher affinity than natural substrates such as fibronectin. The 2.3 angstrom crystal structure of the invasin extracellular region reveals five domains that form a 180 angstrom rod with structural similarities to tandem fibronectin type III domains. The integrin-binding surfaces of invasin and fibronectin include similarly located key residues, but in the context of different folds and surface shapes. The structures of invasin and fibronectin provide an example of convergent evolution, in which invasin presents an optimized surface for integrin binding, in comparison with host substrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hamburger, Z A -- Brown, M S -- Isberg, R R -- Bjorkman, P J -- New York, N.Y. -- Science. 1999 Oct 8;286(5438):291-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology 156-29, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10514372" target="_blank"〉PubMed〈/a〉
    Keywords: *Adhesins, Bacterial ; Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Binding Sites ; Crystallography, X-Ray ; Evolution, Molecular ; Fibronectins/chemistry/metabolism ; Hydrogen Bonding ; Integrins/*metabolism ; Ligands ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Yersinia pseudotuberculosis/*chemistry/metabolism
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1999-04-30
    Description: Notch signaling defines an evolutionarily ancient cell interaction mechanism, which plays a fundamental role in metazoan development. Signals exchanged between neighboring cells through the Notch receptor can amplify and consolidate molecular differences, which eventually dictate cell fates. Thus, Notch signals control how cells respond to intrinsic or extrinsic developmental cues that are necessary to unfold specific developmental programs. Notch activity affects the implementation of differentiation, proliferation, and apoptotic programs, providing a general developmental tool to influence organ formation and morphogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Artavanis-Tsakonas, S -- Rand, M D -- Lake, R J -- NS26084/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Apr 30;284(5415):770-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Cancer Center, Department of Cell Biology, Harvard Medical School, Building 149, 13th Street, Charlestown, MA 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10221902" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Cell Communication ; Cell Division ; Cell Nucleus/metabolism ; Humans ; Intracellular Signaling Peptides and Proteins ; Ligands ; Membrane Proteins/*physiology ; Receptors, Cell Surface/*physiology ; Receptors, Notch ; *Signal Transduction ; Transcription, Genetic
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  • 9
    Publication Date: 1999-07-31
    Description: Many immune receptors are composed of separate ligand-binding and signal-transducing subunits. In natural killer (NK) and T cells, DAP10 was identified as a cell surface adaptor protein in an activating receptor complex with NKG2D, a receptor for the stress-inducible and tumor-associated major histocompatibility complex molecule MICA. Within the DAP10 cytoplasmic domain, an Src homology 2 (SH2) domain-binding site was capable of recruiting the p85 subunit of the phosphatidylinositol 3-kinase (PI 3-kinase), providing for NKG2D-dependent signal transduction. Thus, NKG2D-DAP10 receptor complexes may activate NK and T cell responses against MICA-bearing tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, J -- Song, Y -- Bakker, A B -- Bauer, S -- Spies, T -- Lanier, L L -- Phillips, J H -- AI30581/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):730-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉DNAX Research Institute, 901 California Avenue, Palo Alto, CA 94304, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426994" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Cell Line ; Cytotoxicity, Immunologic ; Humans ; Killer Cells, Natural/*immunology/metabolism ; Ligands ; *Lymphocyte Activation ; Membrane Proteins/chemistry/genetics/*metabolism ; Mice ; Molecular Sequence Data ; NK Cell Lectin-Like Receptor Subfamily K ; Neoplasms/immunology ; Phosphatidylinositol 3-Kinases/metabolism ; Phosphorylation ; Phosphotyrosine/metabolism ; Receptors, Immunologic/chemistry/genetics/*metabolism ; Receptors, Natural Killer Cell ; Signal Transduction ; T-Lymphocytes/*immunology/metabolism ; Tumor Cells, Cultured ; src Homology Domains
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 1999-03-05
    Description: The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-mu-oxo dimanganese units (where mu is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2](NO3)3 (terpy is 2,2':6', 2"-terpyridine), which was synthesized and structurally characterized, contains a di-mu-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Limburg, J -- Vrettos, J S -- Liable-Sands, L M -- Rheingold, A L -- Crabtree, R H -- Brudvig, G W -- GM32715/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Mar 5;283(5407):1524-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Yale University, Post Office Box 208107, New Haven, CT 06520-8107, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10066173" target="_blank"〉PubMed〈/a〉
    Keywords: Catalysis ; Dimerization ; Electron Spin Resonance Spectroscopy ; Ligands ; Manganese/chemistry/metabolism ; Manganese Compounds/chemistry ; Models, Chemical ; Oxidation-Reduction ; Oxides/chemistry ; Oxygen/chemistry/*metabolism ; Oxygen Isotopes ; *Photosynthesis ; Photosynthetic Reaction Center Complex Proteins/*metabolism ; Photosystem II Protein Complex ; Sodium Hypochlorite/chemistry ; Water/chemistry/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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