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  • Articles  (232)
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  • American Association for the Advancement of Science (AAAS)  (232)
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  • Articles  (232)
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  • Latest Papers from Table of Contents or Articles in Press  (232)
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  • American Association for the Advancement of Science (AAAS)  (232)
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  • 1
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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
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Folds on Europa: implications for crustal cycling and accommodation of extension (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-08-11
    Description: Regional-scale undulations with associated small-scale secondary structures are inferred to be folds on Jupiter's moon Europa. Formation is consistent with stresses from tidal deformation, potentially triggering compressional instability of a region of locally high thermal gradient. Folds may compensate for extension elsewhere on Europa and then relax away over time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prockter, L M -- Pappalardo, R T -- New York, N.Y. -- Science. 2000 Aug 11;289(5481):941-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Applied Physics Laboratory, Johns Hopkins University, MS 7-366, 11100 Johns Hopkins Road, Laurel, MD 20723, USA. louise.prockter@jhuapl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10937995" target="_blank"〉PubMed〈/a〉
    Keywords: Extraterrestrial Environment ; Ice ; *Jupiter ; Temperature
    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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  • 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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    Nonlinear simulations of Jupiter's 5-micron hot spots (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-09-08
    Description: Large-scale nonlinear simulations of Jupiter's 5-micron hot spots produce long-lived coherent structures that cause subsidence in local regions, explaining the low cloudiness and the dryness measured by the Galileo probe inside a hot spot. Like observed hot spots, the simulated coherent structures are equatorially confined, have periodic spacing, propagate west relative to the flow, are generally confined to one hemisphere, and have an anticyclonic gyre on their equatorward side. The southern edge of the simulated hot spots develops vertical shear of up to 70 meters per second in the eastward wind, which can explain the results of the Galileo probe Doppler wind experiment.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Showman, A P -- Dowling, T E -- New York, N.Y. -- Science. 2000 Sep 8;289(5485):1737-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Research Council (NRC)/NASA Ames Research Center, Mail Stop 245-3, Moffett Field, CA 94035-1000, USA. showman@humbabe.arc.nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10976064" target="_blank"〉PubMed〈/a〉
    Keywords: *Ammonia ; Extraterrestrial Environment ; *Hydrogen Sulfide ; *Jupiter ; Pressure ; Temperature ; *Water
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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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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  • 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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    Dynamically controlled protein tunneling paths in photosynthetic reaction centers (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-06
    Description: Marcus theory has explained how thermal nuclear motions modulate the energy gap between donor and acceptor sites in protein electron transfer reactions. Thermal motions, however, may also modulate electron tunneling between these reactions. Here we identify a new mechanism of nuclear dynamics amplification that plays a central role when interference among the dominant tunneling pathway tubes is destructive. In these cases, tunneling takes place in protein conformations far from equilibrium that minimize destructive interference. As an example, we demonstrate how this dynamical amplification mechanism affects certain reaction rates in the photosynthetic reaction center and therefore may be critical for biological function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Balabin, I A -- Onuchic, J N -- GM48043/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 6;290(5489):114-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11021791" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry, Physical ; Computer Simulation ; Crystallography, X-Ray ; Darkness ; *Electrons ; Hydrogen Bonding ; Light ; Pheophytins/chemistry/metabolism ; Photosynthetic Reaction Center Complex Proteins/*chemistry/*metabolism ; Physicochemical Phenomena ; Protein Conformation ; Quinones/chemistry/metabolism ; Thermodynamics
    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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  • 8
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    "Fluorescent timer": protein that changes color with time (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-11-25
    Description: We generated a mutant of the red fluorescent protein drFP583. The mutant (E5) changes its fluorescence from green to red over time. The rate of color conversion is independent of protein concentration and therefore can be used to trace time-dependent expression. We used in vivo labeling with E5 to measure expression from the heat shock-dependent promoter in Caenorhabditis elegans and from the Otx-2 promoter in developing Xenopus embryos. Thus, E5 is a "fluorescent timer" that can be used to monitor both activation and down-regulation of target promoters on the whole-organism scale.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Terskikh, A -- Fradkov, A -- Ermakova, G -- Zaraisky, A -- Tan, P -- Kajava, A V -- Zhao, X -- Lukyanov, S -- Matz, M -- Kim, S -- Weissman, I -- Siebert, P -- 1 RO3 TW01362-01/TW/FIC NIH HHS/ -- New York, N.Y. -- Science. 2000 Nov 24;290(5496):1585-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Medicine, Stanford University, Stanford, CA 94305, USA. Alexey.Terskikh@Stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11090358" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/embryology/metabolism ; Caenorhabditis elegans/embryology/genetics ; Cell Line ; Color ; Fluorescence ; Gene Expression Profiling/*methods ; *Gene Expression Regulation ; Gene Expression Regulation, Developmental ; Heat-Shock Proteins/genetics ; *Homeodomain Proteins ; Humans ; Luminescent Proteins/*chemistry/*genetics/metabolism ; Mutation ; Nerve Tissue Proteins/genetics ; Otx Transcription Factors ; *Promoter Regions, Genetic ; Temperature ; Time Factors ; Trans-Activators/genetics ; Xenopus laevis/embryology
    Print ISSN: 0036-8075
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  • 9
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    Detection of daily clouds on Titan (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-20
    Description: We have discovered frequent variations in the near-infrared spectrum of Titan, Saturn's largest moon, which are indicative of the daily presence of sparse clouds covering less than 1% of the area of the satellite. The thermodynamics of Titan's atmosphere and the clouds' altitudes suggest that convection governs their evolutions. Their short lives point to the presence of rain. We propose that Titan's atmosphere resembles Earth's, with clouds, rain, and an active weather cycle, driven by latent heat release from the primary condensible species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, C A -- Hall, J L -- Geballe, T R -- New York, N.Y. -- Science. 2000 Oct 20;290(5491):509-13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86011-6010, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11039930" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Extraterrestrial Environment ; Methane ; Rain ; *Saturn ; Spectrum Analysis ; Sunlight ; Temperature ; Thermodynamics ; Water
    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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  • 10
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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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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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