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  • Mutation  (58)
  • Kinetics  (55)
  • American Association for the Advancement of Science (AAAS)  (111)
  • American Association for the Advancement of Science
  • American Institute of Physics (AIP)
  • 1985-1989  (111)
  • 1950-1954
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  • American Association for the Advancement of Science (AAAS)  (111)
  • American Association for the Advancement of Science
  • American Institute of Physics (AIP)
  • Springer  (6)
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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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    Matrix-driven translocation of cells and nonliving particles (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-05-17
    Description: Cells of metazoan organisms produce and react to complex macromolecular microenvironments known as extracellular matrices. Assembly in vitro of native, compositionally nonuniform collagen-fibronectin matrices caused translocation of certain types of cells or polystyrene-latex beads from regions lacking fibronectin into regions containing it. The translocation process was not due to diffusion, convection, or electrostatic distribution effects, but may depend on nonequilibrium phenomena at the interface of contiguous collagen matrices formed in the presence and absence of fibronectin or particles. Extracellular matrix formation alone was sufficient to drive translocation by a biophysical process that may play a role in cellular migration during embryogenesis, as well as in other types of tissue reorganization such as inflammation, wound healing, and tumor invasion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Newman, S A -- Frenz, D A -- Tomasek, J J -- Rabuzzi, D D -- HD18148/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1985 May 17;228(4701):885-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/4001925" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cartilage/cytology/embryology ; *Cell Movement/drug effects ; Chick Embryo ; Collagen/*pharmacology ; Diffusion ; Extracellular Matrix/*physiology ; Fibroblasts/cytology ; Fibronectins/*pharmacology ; Humans ; In Vitro Techniques ; Kinetics ; Microspheres ; Movement
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  • 3
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    Potassium channels in cardiac cells activated by arachidonic acid and phospholipids (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-06-09
    Description: Two types of potassium-selective channels activated by intracellular arachidonic acid or phosphatidylcholine have been found in neonatal rat atrial cells. In inside-out patches, arachidonic acid and phosphatidylcholine each opened outwardly rectifying potassium-selective channels with conductances of 160 picosiemens (IK.AA) and 68 picosiemens (IK.PC), respectively. These potassium channels were not sensitive to internally applied adenosine triphosphate (ATP), magnesium, or calcium. Lowering the intracellular pH from 7.2 to 6.8 or 6.4 reversibly increased IK.AA channel activity three- or tenfold, respectively. A number of fatty acid derivatives were tested for their ability to activate IK.AA. These potassium-selective channels may help explain the increase in potassium conductance observed in ischemic cells and raise the possibility that fatty acid derivatives act as second messengers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, D -- Clapham, D E -- HL 34873/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1989 Jun 9;244(4909):1174-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Mayo Foundation, Rochester, MN 55905.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2727703" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn ; Arachidonic Acids/*pharmacology ; Atrial Function ; Heart/*physiology ; Hydrogen-Ion Concentration ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Phosphatidylcholines/*pharmacology ; Potassium Channels/drug effects/*physiology ; Rats
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  • 4
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    Identification of the molecular defect in a family with spondyloepiphyseal dysplasia (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-05-26
    Description: Spondyloepiphyseal dysplasias (SED) are a heterogeneous group of inherited disorders characterized by disproportionate short stature and pleiotropic involvement of the skeletal and ocular systems. Evidence has suggested that SED may result from structural defects in type II collagen. To confirm the validity of this hypothesis, the structure of the "candidate" type II collagen gene (COL2A1) has been directly examined in a relatively large SED family. Coarse scanning of the gene by Southern blot hybridization identified an abnormal restriction pattern in one of the affected members of the kindred. Analysis of selected genomic fragments, amplified by the polymerase chain reaction, precisely localized the molecular defect and demonstrated that all affected family members carried the same heterozygous single-exon deletion. As a consequence of the mutation, nearly 90 percent of the assembled type II collagen homotrimers are expected to contain one or more procollagen subunits harboring an interstitial deletion of 36 amino acids in the triple helical domain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, B -- Vissing, H -- Ramirez, F -- Rogers, D -- Rimoin, D -- AR-38648/AR/NIAMS NIH HHS/ -- HD-22657/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1989 May 26;244(4907):978-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, State University of New York Health Science Center, Brooklyn 11203.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2543071" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Child, Preschool ; Chromosome Deletion ; Collagen/*genetics ; DNA Restriction Enzymes ; DNA-Directed DNA Polymerase ; Exons ; Female ; Gene Amplification ; Humans ; Macromolecular Substances ; Male ; Molecular Sequence Data ; Mutation ; Nucleic Acid Hybridization ; Osteochondrodysplasias/*genetics ; Pedigree ; Procollagen/genetics
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  • 5
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    Catalytic hydrolysis of vasoactive intestinal peptide by human autoantibody (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-06-09
    Description: Vasoactive intestinal peptide (VIP) labeled with 125I, [Tyr10-125I]VIP, can be hydrolyzed by immunoglobulin G (IgG) purified from a human subject, as judged by trichloroacetic acid precipitation and reversed-phase high-performance liquid chromatography (HPLC). The hydrolytic activity was precipitated by antibody to human IgG, it was bound by immobilized protein G and showed a molecular mass close to 150 kilodaltons by gel filtration chromatography, properties similar to those of authentic IgG. The Fab fragment, prepared from IgG by papain treatment, retained the VIP hydrolytic activity of the IgG. Peptide fragments produced by treatment of VIP with the antibody fraction were purified by reversed-phase HPLC and identified by fast atom bombardment-mass spectrometry and peptide sequencing. The scissile bond in VIP deduced from these experiments was Gln16-Met17. The antibody concentration (73.4 fmol per milligram of IgG) and the Kd (0.4 nM) were computed from analysis of VIP binding under conditions that did not result in peptide hydrolysis. Analysis of the antibody-mediated VIP hydrolysis at varying concentrations of substrate suggested conformity with Michaelis-Menton kinetics (Km). The values for Km (37.9 X 10(-9) M) and the turnover number kcat (15.6 min-1) suggested relatively tight VIP binding and a moderate catalytic efficiency of the antibody.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paul, S -- Volle, D J -- Beach, C M -- Johnson, D R -- Powell, M J -- Massey, R J -- HL 35506/HL/NHLBI NIH HHS/ -- HL 40348/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1989 Jun 9;244(4909):1158-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Nebraska Medical Center, Omaha 68105.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2727702" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Autoantibodies ; Catalysis ; Chromatography, High Pressure Liquid ; Humans ; Hydrolysis ; Immunoglobulin Fab Fragments ; *Immunoglobulin G ; Kinetics ; Molecular Sequence Data ; Peptide Fragments/isolation & purification ; Vasoactive Intestinal Peptide/*immunology
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  • 6
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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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  • 7
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    Effect of carboxylic acid side chains on the absorption maximum of visual pigments (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-11-17
    Description: The proposal that the absorption maximum of the visual pigments is governed by interaction of the 11-cis-retinal chromophore with charged carboxylic acid side chains in the membrane-embedded regions of the proteins has been tested by mutating five Asp and Glu residues thought to be buried in rhodopsin. Changing Glu113 to Gln causes a dramatic shift in the absorption maximum from 500 nanometers to 380 nanometers, a decrease in the pKa (acidity constant) of the protonated Schiff base of the chromophore to about 6, and a greatly increased reactivity with hydroxylamine. Thus Glu113 appears to be the counterion to the protonated Schiff base. Wavelength modulation in visual pigments apparently is not governed by electrostatic interaction with carboxylate residues, other than the counterion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhukovsky, E A -- Oprian, D D -- 5T32 GM07596-11/GM/NIGMS NIH HHS/ -- EY07965/EY/NEI NIH HHS/ -- R01 EY007965/EY/NEI NIH HHS/ -- S07 RR07044/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1989 Nov 17;246(4932):928-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Brandeis University, Waltham, MA 02254.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2573154" target="_blank"〉PubMed〈/a〉
    Keywords: *Aspartic Acid ; Glutamates ; Glutamic Acid ; Hydrogen-Ion Concentration ; Hydroxylamine ; Hydroxylamines/pharmacology ; Models, Molecular ; Mutation ; Protein Conformation ; Retinal Pigments/*metabolism ; Retinaldehyde/*metabolism ; Retinoids/*metabolism ; Rhodopsin/genetics/*metabolism ; Schiff Bases ; Spectrophotometry
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  • 8
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    Selection for precise chromosomal targeting of a dominant marker by homologous recombination (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-03-10
    Description: The antibiotic resistance gene neomycin phosphotransferase (neo) has been precisely targeted to a chromosomal region close to the cystic fibrosis (CF) locus on chromosome 7. The chromosomal target was the expressed SV40 array integrated at chromosome 7, band q31-q35 in a human-mouse hybrid cell line that contains chromosome 7 as the only human component. Stringent selection for neo expression by homologous recombination (3 of 11 correctly targeted) was achieved by fusing the SV40 large T antigen gene, in frame, to neo in a promoterless construct, such that G418 resistance depended on endogenous promoter function and read-through transcription. Chromosome-mediated gene transfer (CMGT) with G418 selection was then used generate mouse hybrids that carried the targeted locus intact, but retained only a fragment of human chromosome 7. This gene targeting strategy will access new regions of the human (or other mammalian) genome, create precise mutations efficiently by gene disruption, and potentially restore normal gene function by mutation correction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dorin, J R -- Inglis, J D -- Porteous, D J -- New York, N.Y. -- Science. 1989 Mar 10;243(4896):1357-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Human Genetics Unit, Western General Hospital, Edinburgh, United Kingdom.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2538001" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Polyomavirus Transforming/genetics ; Cell Line ; Chromosome Mapping ; *Chromosomes, Human, Pair 7 ; Cloning, Molecular ; *Genes ; Genes, Viral ; Humans ; Hybrid Cells ; Kanamycin Kinase ; Mice ; Mutation ; Phosphotransferases/*genetics ; *Recombination, Genetic ; Restriction Mapping ; Simian virus 40/genetics ; *Transfection
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  • 9
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    HTLV-II transactivation is regulated by the overlapping tax/rex nonstructural genes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-05-13
    Description: The human T-cell leukemia virus (HTLV) types I and II have two nonstructural genes that are encoded in overlapping reading frames. One of these genes, known as tax, has been shown to encode a protein responsible for enhanced transcription (transactivation) from the viral long terminal repeats (LTRs). Genetic evidence indicates that the second nonstructural gene of HTLV-II, here designated rex, acts in trans to modulate tax gene-mediated transactivation in a concentration-dependent fashion. The rex gene may regulate the process of transactivation during the viral life cycle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenblatt, J D -- Cann, A J -- Slamon, D J -- Smalberg, I S -- Shah, N P -- Fujii, J -- Wachsman, W -- Chen, I S -- 1 R01 CA 43370/CA/NCI NIH HHS/ -- 1K11 CA 01314/CA/NCI NIH HHS/ -- CA 32737/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 May 13;240(4854):916-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, UCLA School of Medicine.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2834826" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; DNA, Recombinant ; DNA, Viral/genetics ; Deltaretrovirus/*genetics ; *Genes, Regulator ; *Genes, Viral ; Mutation ; Promoter Regions, Genetic ; RNA, Messenger/genetics/metabolism ; RNA, Viral/genetics/metabolism ; Simian virus 40/genetics ; *Transcription, Genetic ; Transfection
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  • 10
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    Genomic amplification with transcript sequencing (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-29
    Description: A sequencing method called genomic amplification with transcript sequencing (GAWTS) is described that is based on amplification with the polymerase chain reaction (PCR). GAWTS bypasses cloning and increases the rate of sequence acquisition by at least fivefold. The method involves the attachment of a phage promoter onto at least one of the PCR primers. The segments amplified by PCR are transcribed to further increase the signal and to provide an abundance of single-stranded template for reverse transcriptase-mediated dideoxy sequencing. An end-labeled reverse transcriptase primer complementary to the desired sequence generates the additional specificity required to generate unambiguous sequence data. GAWTS can be performed on as little as a nanogram of genomic DNA. The rate of GAWTS can be increased by coamplification and cotranscription of multiple regions as illustrated by two regions of the factor IX gene. Since GAWTS lends itself well to automation, further increases in the rate of sequence acquisition can be expected.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stoflet, E S -- Koeberl, D D -- Sarkar, G -- Sommer, S S -- New York, N.Y. -- Science. 1988 Jan 29;239(4839):491-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Mayo Clinic/Foundation, Rochester, MN 55905.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3340835" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; DNA/genetics ; DNA-Directed DNA Polymerase/metabolism ; DNA-Directed RNA Polymerases ; Electrophoresis, Agar Gel ; Exons ; Factor IX/*genetics ; Hemophilia A/genetics ; Humans ; Molecular Sequence Data ; Mutation ; *Nucleic Acid Amplification Techniques ; T-Phages/enzymology ; *Transcription, Genetic
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