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  • American Association for the Advancement of Science (AAAS)  (136)
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  • 1
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    A mutation in the C. elegans EXP-2 potassium channel that alters feeding behavior (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-05
    Description: The nematode pharynx has a potassium channel with unusual properties, which allows the muscles to repolarize quickly and with the proper delay. Here, the Caenorhabditis elegans exp-2 gene is shown to encode this channel. EXP-2 is a Kv-type (voltage-activated) potassium channel that has inward-rectifying properties resembling those of the structurally dissimilar human ether-a-go-go-related gene (HERG) channel. Null and gain-of-function mutations affect pharyngeal muscle excitability in ways that are consistent with the electrophysiological behavior of the channel, and thereby demonstrate a direct link between the kinetics of this unusual channel and behavior.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3791429/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3791429/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, M W -- Fleischhauer, R -- Dent, J A -- Joho, R H -- Avery, L -- HL46154/HL/NHLBI NIH HHS/ -- NS28407/NS/NINDS NIH HHS/ -- R01 HL046154/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2501-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9148, USA. wdavis@biology.utah.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617464" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Caenorhabditis elegans/genetics/*physiology ; Feeding Behavior ; Genes, Helminth ; Genes, Reporter ; Ion Channel Gating ; Kinetics ; Membrane Potentials ; Models, Molecular ; Muscles/metabolism ; Mutation ; Neurons/metabolism ; Oocytes/metabolism ; Pharyngeal Muscles/physiology ; Potassium Channels/chemistry/genetics/*physiology ; Protein Conformation ; RNA, Complementary/genetics ; Recombinant Fusion Proteins/biosynthesis ; Xenopus laevis
    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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    A structural model of transcription elongation (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-08-01
    Description: The path of the nucleic acids through a transcription elongation complex was tracked by mapping cross-links between bacterial RNA polymerase (RNAP) and transcript RNA or template DNA onto the x-ray crystal structure. In the resulting model, the downstream duplex DNA is nestled in a trough formed by the beta' subunit and enclosed on top by the beta subunit. In the RNAP channel, the RNA/DNA hybrid extends from the enzyme active site, along a region of the beta subunit harboring rifampicin resistance mutations, to the beta' subunit "rudder." The single-stranded RNA is then extruded through another channel formed by the beta-subunit flap domain. The model provides insight into the functional properties of the transcription complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Korzheva, N -- Mustaev, A -- Kozlov, M -- Malhotra, A -- Nikiforov, V -- Goldfarb, A -- Darst, S A -- GM30717/GM/NIGMS NIH HHS/ -- GM49242/GM/NIGMS NIH HHS/ -- GM53759/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):619-25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Public Health Research Institute, 455 First Avenue, New York, NY 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10915625" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Cross-Linking Reagents ; Crystallography, X-Ray ; DNA/chemistry/genetics/*metabolism ; DNA Primers ; DNA-Directed RNA Polymerases/*chemistry/genetics/metabolism ; Models, Molecular ; Mutation ; Nucleic Acid Conformation ; Nucleic Acid Hybridization ; Oligodeoxyribonucleotides/chemistry/metabolism ; Oligoribonucleotides/chemistry/metabolism ; Protein Conformation ; Protein Structure, Tertiary ; RNA, Messenger/chemistry/genetics/*metabolism ; Templates, Genetic ; Thermus/enzymology ; *Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 3
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    Crystal structure of a gammadelta T cell receptor ligand T22: a truncated MHC-like fold (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-15
    Description: Murine T10 and T22 are highly related nonclassical major histocompatibility complex (MHC) class Ib proteins that bind to certain gammadelta T cell receptors (TCRs) in the absence of other components. The crystal structure of T22b at 3.1 angstroms reveals similarities to MHC class I molecules, but one side of the normal peptide-binding groove is severely truncated, which allows direct access to the beta-sheet floor. Potential gammadelta TCR-binding sites can be inferred from functional mapping of T10 and T22 point mutants and allelic variants. Thus, T22 represents an unusual variant of the MHC-like fold and indicates that gammadelta and alphabeta TCRs interact differently with their respective MHC ligands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wingren, C -- Crowley, M P -- Degano, M -- Chien, Y -- Wilson, I A -- AI33431/AI/NIAID NIH HHS/ -- CA58896/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2000 Jan 14;287(5451):310-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and the Skaggs Institute for 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/10634787" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Substitution ; Animals ; Binding Sites ; Crystallography, X-Ray ; Glycosylation ; Histocompatibility Antigens Class I/*chemistry ; Hydrogen Bonding ; Ligands ; Mice ; Models, Molecular ; Point Mutation ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Proteins/*chemistry/immunology/metabolism ; Receptors, Antigen, T-Cell, gamma-delta/immunology/*metabolism ; Surface Properties ; beta 2-Microglobulin/chemistry
    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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  • 4
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    Atomic structure of PDE4: insights into phosphodiesterase mechanism and specificity (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-06-10
    Description: Cyclic nucleotides are second messengers that are essential in vision, muscle contraction, neurotransmission, exocytosis, cell growth, and differentiation. These molecules are degraded by a family of enzymes known as phosphodiesterases, which serve a critical function by regulating the intracellular concentration of cyclic nucleotides. We have determined the three-dimensional structure of the catalytic domain of phosphodiesterase 4B2B to 1.77 angstrom resolution. The active site has been identified and contains a cluster of two metal atoms. The structure suggests the mechanism of action and basis for specificity and will provide a framework for structure-assisted drug design for members of the phosphodiesterase family.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, R X -- Hassell, A M -- Vanderwall, D -- Lambert, M H -- Holmes, W D -- Luther, M A -- Rocque, W J -- Milburn, M V -- Zhao, Y -- Ke, H -- Nolte, R T -- AI33072/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2000 Jun 9;288(5472):1822-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Structural Chemistry, Department of Molecular Sciences, 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/10846163" target="_blank"〉PubMed〈/a〉
    Keywords: 3',5'-Cyclic-AMP Phosphodiesterases/*chemistry/*metabolism ; Binding Sites ; Catalytic Domain ; Crystallization ; Crystallography, X-Ray ; Cyclic AMP/chemistry/*metabolism ; Cyclic GMP/chemistry/metabolism ; Cyclic Nucleotide Phosphodiesterases, Type 4 ; Hydrogen Bonding ; Hydrolysis ; Metals/metabolism ; Models, Molecular ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Substrate Specificity
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  • 5
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    Two-amino acid molecular switch in an epithelial morphogen that regulates binding to two distinct receptors (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-20
    Description: Ectodysplasin, a member of the tumor necrosis factor family, is encoded by the anhidrotic ectodermal dysplasia (EDA) gene. Mutations in EDA give rise to a clinical syndrome characterized by loss of hair, sweat glands, and teeth. EDA-A1 and EDA-A2 are two isoforms of ectodysplasin that differ only by an insertion of two amino acids. This insertion functions to determine receptor binding specificity, such that EDA-A1 binds only the receptor EDAR, whereas EDA-A2 binds only the related, but distinct, X-linked ectodysplasin-A2 receptor (XEDAR). In situ binding and organ culture studies indicate that EDA-A1 and EDA-A2 are differentially expressed and play a role in epidermal morphogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yan, M -- Wang, L C -- Hymowitz, S G -- Schilbach, S -- Lee, J -- Goddard, A -- de Vos, A M -- Gao, W Q -- Dixit, V M -- New York, N.Y. -- Science. 2000 Oct 20;290(5491):523-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11039935" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Binding Sites ; Cell Line ; DNA-Binding Proteins/metabolism ; Ectodermal Dysplasia/genetics ; Ectodysplasins ; Epidermis/embryology/*metabolism ; Humans ; *I-kappa B Proteins ; In Situ Hybridization ; Ligands ; Membrane Proteins/*chemistry/*metabolism ; Mice ; Models, Molecular ; Molecular Sequence Data ; Morphogenesis ; NF-kappa B/metabolism ; Phosphorylation ; Point Mutation ; Protein Conformation ; Proteins/metabolism ; Receptors, Cell Surface/chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; TNF Receptor-Associated Factor 6 ; Transfection
    Print ISSN: 0036-8075
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  • 6
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    Twists in catalysis: alternating conformations of Escherichia coli thioredoxin reductase (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-08-19
    Description: In thioredoxin reductase (TrxR) from Escherichia coli, cycles of reduction and reoxidation of the flavin adenine dinucleotide (FAD) cofactor depend on rate-limiting rearrangements of the FAD and NADPH (reduced form of nicotinamide adenine dinucleotide phosphate) domains. We describe the structure of the flavin-reducing conformation of E. coli TrxR at a resolution of 3.0 angstroms. The orientation of the two domains permits reduction of FAD by NADPH and oxidation of the enzyme dithiol by the protein substrate, thioredoxin. The alternate conformation, described by Kuriyan and co-workers, permits internal transfer of reducing equivalents from reduced FAD to the active-site disulfide. Comparison of these structures demonstrates that switching between the two conformations involves a "ball-and-socket" motion in which the pyridine nucleotide-binding domain rotates by 67 degrees.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lennon, B W -- Williams, C H Jr -- Ludwig, M L -- GM16429/GM/NIGMS NIH HHS/ -- GM18723/GM/NIGMS NIH HHS/ -- GM21444/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Aug 18;289(5482):1190-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biophysics Research Division, Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10947986" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Catalysis ; Crystallography, X-Ray ; Escherichia coli/*enzymology ; Flavin-Adenine Dinucleotide/metabolism ; Hydrogen Bonding ; Models, Molecular ; NADP/metabolism ; Oxidation-Reduction ; Protein Conformation ; Protein Structure, Tertiary ; Thioredoxin-Disulfide Reductase/*chemistry/*metabolism ; Thioredoxins/metabolism
    Print ISSN: 0036-8075
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  • 7
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    Seeing the herpesvirus capsid at 8.5 A (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-08
    Description: Human herpesviruses are large and structurally complex viruses that cause a variety of diseases. The three-dimensional structure of the herpesvirus capsid has been determined at 8.5 angstrom resolution by electron cryomicroscopy. More than 30 putative alpha helices were identified in the four proteins that make up the 0.2 billion-dalton shell. Some of these helices are located at domains that undergo conformational changes during capsid assembly and DNA packaging. The unique spatial arrangement of the heterotrimer at the local threefold positions accounts for the asymmetric interactions with adjacent capsid components and the unusual co-dependent folding of its subunits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Z H -- Dougherty, M -- Jakana, J -- He, J -- Rixon, F J -- Chiu, W -- New York, N.Y. -- Science. 2000 May 5;288(5467):877-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Laboratory Medicine, University of Texas-Houston Medical School, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10797014" target="_blank"〉PubMed〈/a〉
    Keywords: Capsid/*chemistry/*ultrastructure ; Capsid Proteins ; Cryoelectron Microscopy ; Herpesvirus 1, Human/chemistry/*ultrastructure ; Image Processing, Computer-Assisted ; Models, Molecular ; Molecular Weight ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary
    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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  • 8
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    The structural basis of ribosome activity in peptide bond synthesis (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-08-11
    Description: Using the atomic structures of the large ribosomal subunit from Haloarcula marismortui and its complexes with two substrate analogs, we establish that the ribosome is a ribozyme and address the catalytic properties of its all-RNA active site. Both substrate analogs are contacted exclusively by conserved ribosomal RNA (rRNA) residues from domain V of 23S rRNA; there are no protein side-chain atoms closer than about 18 angstroms to the peptide bond being synthesized. The mechanism of peptide bond synthesis appears to resemble the reverse of the acylation step in serine proteases, with the base of A2486 (A2451 in Escherichia coli) playing the same general base role as histidine-57 in chymotrypsin. The unusual pK(a) (where K(a) is the acid dissociation constant) required for A2486 to perform this function may derive in part from its hydrogen bonding to G2482 (G2447 in E. coli), which also interacts with a buried phosphate that could stabilize unusual tautomers of these two bases. The polypeptide exit tunnel is largely formed by RNA but has significant contributions from proteins L4, L22, and L39e, and its exit is encircled by proteins L19, L22, L23, L24, L29, and L31e.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nissen, P -- Hansen, J -- Ban, N -- Moore, P B -- Steitz, T A -- GM22778/GM/NIGMS NIH HHS/ -- GM54216/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Aug 11;289(5481):920-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biophysics and Biochemistry and Department of Chemistry, Yale University, and Howard Hughes Medical Institute, New Haven, CT 06520-8114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10937990" target="_blank"〉PubMed〈/a〉
    Keywords: Archaeal Proteins/chemistry/metabolism ; Base Pairing ; Base Sequence ; Binding Sites ; Catalysis ; Crystallization ; Evolution, Molecular ; Haloarcula marismortui/chemistry/metabolism/ultrastructure ; Hydrogen Bonding ; Hydrogen-Ion Concentration ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; Oligonucleotides/metabolism ; *Peptide Biosynthesis ; Peptides/metabolism ; Peptidyl Transferases/antagonists & inhibitors/chemistry/*metabolism ; Phosphates/chemistry/metabolism ; Protein Conformation ; Puromycin/metabolism ; RNA, Archaeal/chemistry/metabolism ; RNA, Catalytic/*chemistry/*metabolism ; RNA, Ribosomal, 23S/*chemistry/*metabolism ; RNA, Transfer/metabolism ; RNA, Transfer, Amino Acyl/metabolism ; Ribosomal Proteins/chemistry/metabolism ; Ribosomes/chemistry/*metabolism
    Print ISSN: 0036-8075
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  • 9
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    Structural mechanism for STI-571 inhibition of abelson tyrosine kinase (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-09-16
    Description: The inadvertent activation of the Abelson tyrosine kinase (Abl) causes chronic myelogenous leukemia (CML). A small-molecule inhibitor of Abl (STI-571) is effective in the treatment of CML. We report the crystal structure of the catalytic domain of Abl, complexed to a variant of STI-571. Critical to the binding of STI-571 is the adoption by the kinase of an inactive conformation, in which a centrally located "activation loop" is not phosphorylated. The conformation of this loop is distinct from that in active protein kinases, as well as in the inactive form of the closely related Src kinases. These results suggest that compounds that exploit the distinctive inactivation mechanisms of individual protein kinases can achieve both high affinity and high specificity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schindler, T -- Bornmann, W -- Pellicena, P -- Miller, W T -- Clarkson, B -- Kuriyan, J -- GM29362/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Sep 15;289(5486):1938-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratories of Molecular Biophysics and Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10988075" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antineoplastic Agents/chemistry/*pharmacology ; Benzamides ; Catalytic Domain ; Crystallography, X-Ray ; Enzyme Activation ; Enzyme Inhibitors/chemistry/*pharmacology ; Humans ; Imatinib Mesylate ; Mice ; Models, Molecular ; Phosphorylation ; *Piperazines ; Protein Conformation ; Proto-Oncogene Proteins c-abl/*antagonists & inhibitors/chemistry/metabolism ; Pyrimidines/chemistry/*pharmacology ; Recombinant Fusion Proteins ; Structure-Activity Relationship
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  • 10
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    A structural framework for deciphering the link between I-Ag7 and autoimmune diabetes (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-04-25
    Description: Susceptibility to murine and human insulin-dependent diabetes mellitus correlates strongly with major histocompatibility complex (MHC) class II I-A or HLA-DQ alleles that lack an aspartic acid at position beta57. I-Ag7 lacks this aspartate and is the only class II allele expressed by the nonobese diabetic mouse. The crystal structure of I-Ag7 was determined at 2.6 angstrom resolution as a complex with a high-affinity peptide from the autoantigen glutamic acid decarboxylase (GAD) 65. I-Ag7 has a substantially wider peptide-binding groove around beta57, which accounts for distinct peptide preferences compared with other MHC class II alleles. Loss of Asp(beta57) leads to an oxyanion hole in I-Ag7 that can be filled by peptide carboxyl residues or, perhaps, through interaction with the T cell receptor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corper, A L -- Stratmann, T -- Apostolopoulos, V -- Scott, C A -- Garcia, K C -- Kang, A S -- Wilson, I A -- Teyton, L -- CA58896/CA/NCI NIH HHS/ -- DK55037/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2000 Apr 21;288(5465):505-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Skaggs Institute for 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/10775108" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Aspartic Acid/chemistry ; Crystallography, X-Ray ; Diabetes Mellitus, Type 1/*immunology ; Drosophila melanogaster ; *Genes, MHC Class II ; Glutamate Decarboxylase/metabolism ; Histocompatibility Antigens Class II/*chemistry/genetics/metabolism ; Humans ; Hydrogen Bonding ; Mice ; Mice, Inbred NOD ; Models, Molecular ; Molecular Sequence Data ; Peptide Library ; Protein Binding ; Protein Conformation ; Protein Structure, Secondary ; Receptors, Antigen, T-Cell/metabolism ; Recombinant Proteins/chemistry/metabolism
    Print ISSN: 0036-8075
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