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  • Articles  (31)
  • Binding Sites
  • American Association for the Advancement of Science (AAAS)  (31)
  • Elsevier
  • 1985-1989  (31)
  • Chemistry and Pharmacology  (31)
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  • Articles  (31)
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  • American Association for the Advancement of Science (AAAS)  (31)
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  • 1
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    The MHC-binding and gp120-binding functions of CD4 are separable (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-08-18
    Description: CD4 is a cell surface glycoprotein that is thought to interact with nonpolymorphic determinants of class II major histocompatibility (MHC) molecules. CD4 is also the receptor for the human immunodeficiency virus (HIV), binding with high affinity to the HIV-1 envelope glycoprotein, gp120. Homolog-scanning mutagenesis was used to identify CD4 regions that are important in class II MHC binding and to determine whether the gp120 and class II MHC binding sites of CD4 are related. Class II MHC binding was abolished by mutations in each of the first three immunoglobulin-like domains of CD4. The gp120 binding could be abolished without affecting class II MHC binding and vice versa, although at least one mutation examined reduced both functions significantly. These findings indicate that, while there may be overlap between the gp120 and class II MHC binding sites of CD4, these sites are distinct and can be separated. Thus it should be possible to design CD4 analogs that can block HIV infectivity but intrinsically lack the ability to affect the normal immune response by binding to class II MHC molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lamarre, D -- Ashkenazi, A -- Fleury, S -- Smith, D H -- Sekaly, R P -- Capon, D J -- New York, N.Y. -- Science. 1989 Aug 18;245(4919):743-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire d'Immunologie, Institut de Recherches Cliniques de Montreal, Quebec, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2549633" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens, Surface ; Binding Sites ; DNA, Recombinant ; HIV/*metabolism ; HIV Envelope Protein gp120 ; HLA-DP Antigens/immunology ; Histocompatibility Antigens Class II/*immunology ; Humans ; Hybridomas ; Mice ; Molecular Sequence Data ; Mutation ; Receptors, HIV ; Receptors, Virus/genetics/immunology/*metabolism ; Retroviridae Proteins/immunology/*metabolism ; Rosette Formation ; Structure-Activity Relationship ; T-Lymphocytes/immunology/metabolism ; Transfection
    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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    Function of a bacterial activator protein that binds to transcriptional enhancers (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-02-03
    Description: The nitrogen regulatory (NtrC) protein of enteric bacteria, which binds to sites that have the properties of transcriptional enhancers, is known to activate transcription by a form of RNA polymerase that contains the NtrA protein (sigma 54) as sigma factor (referred to as sigma 54-holoenzyme). In the presence of adenosine triphosphate, the NtrC protein catalyzes isomerization of closed recognition complexes between sigma 54-holoenzyme and the glnA promoter to open complexes in which DNA in the region of the transcription start site is locally denatured. NtrC is not required subsequently for maintenance of open complexes or initiation of transcription.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Popham, D L -- Szeto, D -- Keener, J -- Kustu, S -- GM38361/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1989 Feb 3;243(4891):629-35.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, University of California, Berkley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2563595" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/analogs & derivatives/metabolism/pharmacology ; *Bacterial Proteins ; Base Sequence ; Binding Sites ; DNA, Bacterial/metabolism ; DNA-Binding Proteins/*metabolism ; DNA-Directed RNA Polymerases/metabolism ; Deoxyribonuclease I ; *Enhancer Elements, Genetic ; Glutamate-Ammonia Ligase/genetics ; Heparin/pharmacology ; Molecular Sequence Data ; Mutation ; PII Nitrogen Regulatory Proteins ; Phosphorylation ; Promoter Regions, Genetic ; Salmonella typhimurium/*genetics ; Sigma Factor/metabolism ; *Trans-Activators ; Transcription Factors ; *Transcription, Genetic
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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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    Evidence from cassette mutagenesis for a structure-function motif in a protein of unknown structure (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-22
    Description: The three-dimensional structure of most enzymes is unknown; however, many enzymes may have structural motifs similar to those in the known structures of functionally related enzymes. Evidence is presented that an enzyme of unknown structure [Ile-transfer RNA (tRNA) synthetase] may share a functionally important structural motif with an enzyme of related function (Tyr-tRNA synthetase). This approach involves (i) identifying segments of Ile-tRNA synthetase that have been unusually conserved during evolution, (ii) predicting the function of one such segment by assuming a structural relation between Ile-tRNA synthetase and Tyr-tRNA synthetase, and (iii) testing the predicted function by mutagenesis and subsequent biochemical analysis. Random mutations were introduced by cassette mutagenesis into a ten-amino-acid segment of Ile-tRNA synthetase that was predicted to be involved in the formation of the binding site for isoleucine. Few amino acid substitutions appear to be tolerated in this region. However, one substitution (independently isolated twice) increased the Michaelis constant Km for isoleucine in the adenylate synthesis reaction by greater than 6000-fold, but had little effect on the Km for adenosine triphosphate, the apparent Km for tRNA, or the rate constant kcat.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Clarke, N D -- Lien, D C -- Schimmel, P -- GM15539/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 22;240(4851):521-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3282306" target="_blank"〉PubMed〈/a〉
    Keywords: *Amino Acyl-tRNA Synthetases ; Binding Sites ; DNA Mutational Analysis ; Escherichia coli/enzymology ; *Isoleucine-tRNA Ligase ; Kinetics ; Protein Conformation ; Saccharomyces cerevisiae/enzymology ; Structure-Activity Relationship
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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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    Point mutations in the human vitamin D receptor gene associated with hypocalcemic rickets (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-23
    Description: Hypocalcemic vitamin D-resistant rickets is a human genetic disease resulting from target organ resistance to the action of 1,25-dihydroxyvitamin D3. Two families with affected children homozygous for this autosomal recessive disorder were studied for abnormalities in the intracellular vitamin D receptor (VDR) and its gene. Although the receptor displays normal binding of 1,25-dihydroxyvitamin D3 hormone, VDR from affected family members has a decreased affinity for DNA. Genomic DNA isolated from these families was subjected to oligonucleotide-primed DNA amplification, and each of the nine exons encoding the receptor protein was sequenced for a genetic mutation. In each family, a different single nucleotide mutation was found in the DNA binding domain of the protein; one family near the tip of the first zinc finger (Gly----Asp) and one at the tip of the second zinc finger (Arg----Gly). The mutant residues were created in vitro by oligonucleotide directed point mutagenesis of wild-type VDR complementary DNA and this cDNA was transfected into COS-1 cells. The produced protein is biochemically indistinguishable from the receptor isolated from patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hughes, M R -- Malloy, P J -- Kieback, D G -- Kesterson, R A -- Pike, J W -- Feldman, D -- O'Malley, B W -- New York, N.Y. -- Science. 1988 Dec 23;242(4886):1702-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2849209" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Calcitriol/metabolism ; Cell Line ; Cell Line, Transformed ; Codon ; DNA/genetics/metabolism ; Exons ; Female ; Gene Amplification ; Homozygote ; Humans ; Hypocalcemia/*genetics ; Immunoblotting ; Male ; Molecular Sequence Data ; *Mutation ; Receptors, Calcitriol ; Receptors, Steroid/*genetics/metabolism ; Rickets/*genetics ; Transfection
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  • 5
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    Tertiary structure of plant RuBisCO: domains and their contacts (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-01
    Description: The three-dimensional structure of ribulose-1,5-biphosphate carboxylase-oxygenase (RuBisCO), has been determined at 2.6 A resolution. This enzyme initiates photosynthesis by combining carbon dioxide with ribulose bisphosphate to form two molecules of 3-phosphoglycerate. In plants, RuBisCO is built from eight large (L) and eight small (S) polypeptide chains, or subunits. Both S chains and the NH2-terminal domain (N) of L are antiparallel beta, "open-face-sandwich" domains with four-stranded beta sheets and flanking alpha helices. The main domain (B) of L is an alpha/beta barrel containing most of the catalytic residues. The active site is in a pocket at the opening of the barrel that is partly covered by the N domain of a neighboring L chain. The domain contacts of the molecule and its conserved residues are discussed in terms of this structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapman, M S -- Suh, S W -- Curmi, P M -- Cascio, D -- Smith, W W -- Eisenberg, D S -- New York, N.Y. -- Science. 1988 Jul 1;241(4861):71-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Institute, University of California, Los Angeles 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3133767" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Macromolecular Substances ; Molecular Sequence Data ; Plants/*enzymology ; Protein Conformation ; Rhodospirillum rubrum/enzymology ; *Ribulose-Bisphosphate Carboxylase ; X-Ray Diffraction
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  • 6
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    The 3' splice site of pre-messenger RNA is recognized by a small nuclear ribonucleoprotein (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-12-20
    Description: A component present in splicing extracts selectively binds the 3' splice site of a precursor messenger RNA (pre-mRNA) transcript of a human beta-globin gene. Since this component can be immunoprecipitated by either autoantibodies of the Sm class or antibodies specifically directed against trimethylguanosine, it is a small nuclear ribonucleoprotein (snRNP). Its interaction with the 3' splice site occurs rapidly even at 0 degrees C, does not require adenosine triphosphate, and is altered by certain mutations in the 3' splice site region. Binding is surprisingly insensitive to treatment of the extract with micrococcal nuclease. The U5 particle is the only abundant Sm snRNP with a capped 5' end that is equally resistant to micrococcal nuclease. This suggests that, in addition to the U1 and U2 snRNP's, U5 snRNP's participate in pre-mRNA splicing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chabot, B -- Black, D L -- LeMaster, D M -- Steitz, J A -- GM-26154/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1985 Dec 20;230(4732):1344-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2933810" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Globins/genetics ; Humans ; Nucleic Acid Conformation ; Nucleic Acid Precursors/*genetics/metabolism ; Protein Binding ; RNA Precursors ; *RNA Splicing ; RNA, Messenger/*genetics/metabolism ; Ribonucleoproteins/*genetics/metabolism ; Ribonucleoproteins, Small Nuclear ; Transcription, Genetic
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  • 7
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    Crystal structure of Cd,Zn metallothionein (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-02-14
    Description: The anomalous scattering data from five Cd in the native protein were used to determine the crystal structure of cadmium, zinc (Cd,Zn) metallothionein isoform II from rat liver. The structure of a 4-Cd cluster was solved by direct methods. A 2.3 A resolution electron density map was calculated by iterative single-wavelength anomalous scattering. The structure is folded into two domains. The amino terminal domain (beta) of residues 1 to 29 enfolds a three-metal cluster of one Cd and two Zn atoms coordinated by six terminal cysteine thiolate ligands and three bridging cysteine thiolates. The carboxyl terminal domain (alpha) of residues 30 to 61 enfolds a 4-Cd cluster coordinated by six terminal and five bridging cysteine thiolates. All seven metal sites have tetrahedral coordination geometry. The domains are roughly spherical, and the diameter is 15 to 20 A; there is limited contact between domains. The folding of alpha and beta is topologically similar but with opposite chirality. Redundant, short cysteine-containing sequences have similar roles in cluster formation in both alpha and beta.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Furey, W F -- Robbins, A H -- Clancy, L L -- Winge, D R -- Wang, B C -- Stout, C D -- GM-36535/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1986 Feb 14;231(4739):704-10.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3945804" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Cadmium ; Crystallography ; Cysteine ; *Metallothionein ; Models, Molecular ; Protein Conformation ; Rats ; Solutions ; X-Ray Diffraction ; Zinc
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  • 8
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    HIV-infected cells are killed by rCD4-ricin A chain (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-25
    Description: The gp120 envelope glycoprotein of the human immunodeficiency virus (HIV), which is expressed on the surface of many HIV-infected cells, binds to the cell surface molecule CD4. Soluble derivatives of recombinant CD4 (rCD4) that bind gp120 with high affinity are attractive vehicles for targeting a cytotoxic reagent to HIV-infected cells. Soluble rCD4 was conjugated to the active subunit of the toxin ricin. This conjugate killed HIV-infected H9 cells but was 1/1000 as toxic to uninfected H9 cells (which do not express gp120) and was not toxic to Daudi cells (which express major histocompatibility class II antigens, the putative natural ligand for cell surface CD4). Specific killing of infected cells can be blocked by rgp120, rCD4, or a monoclonal antibody to the gp120 binding site on CD4.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Till, M A -- Ghetie, V -- Gregory, T -- Patzer, E J -- Porter, J P -- Uhr, J W -- Capon, D J -- Vitetta, E S -- CA-09082/CA/NCI NIH HHS/ -- CA-28149/CA/NCI NIH HHS/ -- CA-41081/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Nov 25;242(4882):1166-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2847316" target="_blank"〉PubMed〈/a〉
    Keywords: Antigens, Differentiation, T-Lymphocyte/*administration & dosage/immunology ; Binding Sites ; Cell Line ; Cell Survival ; Electrophoresis, Polyacrylamide Gel ; HIV/*immunology ; HIV Envelope Protein gp120 ; Histocompatibility Antigens Class II/immunology ; Humans ; Recombinant Proteins/administration & dosage/immunology ; Retroviridae Proteins/*immunology/metabolism ; Ricin/metabolism/*pharmacology ; T-Lymphocytes/immunology/microbiology/physiology
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  • 9
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    Identification of a putative regulator of early T cell activation genes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-08
    Description: Molecules involved in the antigen receptor-dependent regulation of early T cell activation genes were investigated with the use of functional sequences of the T cell activation-specific enhancer of interleukin-2 (IL-2). One of these sequences forms a protein complex, NFAT-1, specifically with nuclear extracts of activated T cells. This complex appeared 10 to 25 minutes before the activation of the IL-2 gene. Studies with inhibitors of protein synthesis indicated that the time of synthesis of the activator of the IL-2 gene in Jurkat T cells corresponds to the time of appearance of NFAT-1. NFAT-1, or a very similar protein, bound functional sequences of the long terminal repeat (LTR) of the human immunodeficiency virus type 1; the LTR of this virus is known to be stimulated during early T cell activation. The binding site for this complex activated a linked promoter after transfection into antigen receptor-activated T cells but not other cell types. These characteristics suggest that NFAT-1 transmits signals initiated at the T cell antigen receptor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shaw, J P -- Utz, P J -- Durand, D B -- Toole, J J -- Emmel, E A -- Crabtree, G R -- CA 01048/CA/NCI NIH HHS/ -- CA 39612/CA/NCI NIH HHS/ -- HL 33942/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 8;241(4862):202-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Stanford University, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3260404" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; DNA-Binding Proteins/*physiology ; *Enhancer Elements, Genetic ; HIV/genetics ; Humans ; In Vitro Techniques ; Interleukin-2/genetics ; *Lymphocyte Activation ; Nuclear Proteins/*physiology ; Receptors, Antigen, T-Cell/*physiology ; *Regulatory Sequences, Nucleic Acid ; T-Lymphocytes/*physiology ; Transcription Factors/*physiology
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  • 10
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    Three-dimensional solution structure of a single zinc finger DNA-binding domain (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-08-11
    Description: The three-dimensional solution structure of a zinc finger nucleic acid binding motif has been determined by nuclear magnetic resonance (NMR) spectroscopy. Spectra of a synthetic peptide corresponding to a single zinc finger from the Xenopus protein Xfin yielded distance and dihedral angle constraints that were used to generate structures from distance geometry and restrained molecular dynamics calculations. The zinc finger is an independently folded domain with a compact globular structure in which the zinc atom is bound by two cysteine and two histidine ligands. The polypeptide backbone fold consists of a well-defined helix, starting as alpha and ending as 3(10) helix, packed against two beta strands that are arranged in a hairpin structure. A high density of basic and polar amino acid side chains on the exposed face of the helix are probably involved in DNA binding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, M S -- Gippert, G P -- Soman, K V -- Case, D A -- Wright, P E -- GM 36643/GM/NIGMS NIH HHS/ -- GM38794/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1989 Aug 11;245(4918):635-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2503871" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Cysteine/metabolism ; DNA/*metabolism ; DNA-Binding Proteins/*metabolism ; Histidine/metabolism ; Hydrogen Bonding ; Magnetic Resonance Spectroscopy ; Metalloproteins/*metabolism ; Molecular Sequence Data ; Molecular Structure ; Protein Conformation ; Solutions ; Thermodynamics ; Xenopus ; Zinc/metabolism
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