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  • Articles  (65)
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  • American Association for the Advancement of Science (AAAS)  (65)
  • American Chemical Society (ACS)
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  • 2020-2024
  • 2015-2019
  • 1990-1994  (65)
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  • 1991  (65)
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  • Articles  (65)
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  • American Association for the Advancement of Science (AAAS)  (65)
  • American Chemical Society (ACS)
  • Elsevier
  • Wiley
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  • 2020-2024
  • 2015-2019
  • 1990-1994  (65)
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  • 1
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    Evidence of lactate dehydrogenase-B allozyme effects in the teleost, Fundulus heteroclitus (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-08-23
    Description: The evolutionary significance of protein polymorphisms has long been debated. Exponents of the balanced theory advocate that selection operates to maintain polymorphisms, whereas the neoclassical school argues that most genetic variation is neutral. Some studies have suggested that protein polymorphisms are not neutral, but their significance has been questioned because one cannot eliminate the possibility that linked loci were responsible for the observed differences. Evidence is presented that an enzymatic phenotype can affect carbon flow through a metabolic pathway. Glucose flux differences between lactate dehydrogenase-B phenotypes of Fundulus heteroclitus were reversed by substituting the Ldh-B gene product of one homozygous genotype with that of another.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DiMichele, L -- Paynter, K T -- Powers, D A -- New York, N.Y. -- Science. 1991 Aug 23;253(5022):898-900.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station 77843.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1876847" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastocyst/enzymology ; Genotype ; Glucose/metabolism ; Glycolysis ; Isoenzymes ; Killifishes/embryology/*genetics/metabolism ; Kinetics ; L-Lactate Dehydrogenase/*genetics/metabolism ; Lactates/metabolism ; Lactic Acid ; Microinjections ; Phenotype ; Swine
    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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    Negative regulation of CD45 protein tyrosine phosphatase activity by ionomycin in T cells (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-09-20
    Description: CD45 is a leukocyte-specific, transmembrane protein tyrosine phosphatase (PTPase) required for T cell responsiveness. How the activity of PTPases is regulated in vivo is unclear. Treatment of murine thymocytes and a variety of murine T cell lines with the calcium ionophore ionomycin decreased CD45 PTPase activity. Ionomycin treatment also led to a decreased phosphorylation of serine residues in CD45. These results indicate that increased intracellular calcium modulates CD45 PTPase activity, demonstrating regulation of CD45 PTPase activity in vivo, and also implicate serine dephosphorylation as a possible mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ostergaard, H L -- Trowbridge, I S -- CA-17733/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 Sep 20;253(5026):1423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, Salk Institute, San Diego, CA 92186.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1654595" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/*metabolism ; Antigens, CD45 ; Cell Line ; Histocompatibility Antigens/*metabolism ; Ionomycin/*pharmacology ; Kinetics ; Mice ; Mice, Inbred BALB C ; Phosphoprotein Phosphatases/*metabolism ; Protein Tyrosine Phosphatases ; Spleen/drug effects/enzymology/immunology ; T-Lymphocytes/drug effects/*enzymology/immunology ; Thymus Gland/immunology
    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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  • 3
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    An unexpectedly efficient catalytic antibody operating by ping-pong and induced fit mechanisms (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-03
    Description: A transition state analogue was used to produce a mouse antibody that catalyzes transesterification in water. The antibody behaves as a highly efficient catalyst with a covalent intermediate and the characteristic of induced fit. While some features of the catalytic pathway were programmed when the hapten was designed and reflect favorable substrate-antibody interactions, other features are a manifestation of the chemical potential of antibody diversity. The fact that antibodies recapitulate mechanisms and pathways previously thought to be a characteristic of highly evolved enzymes suggests that once an appropriate binding cavity is achieved, reaction pathways commensurate with the intrinsic chemical potential of proteins ensue.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wirsching, P -- Ashley, J A -- Benkovic, S J -- Janda, K D -- Lerner, R A -- GM43858-01/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 May 3;252(5006):680-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Scripps Research Institute, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2024120" target="_blank"〉PubMed〈/a〉
    Keywords: Acylation ; Alcohols/metabolism ; Animals ; Antibodies, Monoclonal/immunology/*metabolism ; Antibody Specificity ; Binding Sites, Antibody ; *Catalysis ; Enzymes/metabolism ; Esterification ; Haptens ; Kinetics ; Mice ; Water
    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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    Inhibition of Rap1A binding to cytochrome b558 of NADPH oxidase by phosphorylation of Rap1A (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-12-20
    Description: Rap1A is a low molecular weight guanosine triphosphate (GTP)-binding protein in human neutrophil membranes whose cellular function is unknown. Rap1A was found to form stoichiometric complexes with the cytochrome b558 component of the phagocyte nicotinamide adenine dinucleotide phosphate (NADPH) oxidase system. The (guanosine-5'-O-(3-thiotriphosphate) (GTP-gamma-S)-bound form of Rap1A bound more tightly to cytochrome b558 than did the guanosine diphosphate-bound form. No complex formation was observed between cytochrome b558 and H-Ras-GTP-gamma-S or Rap1A-GTP-gamma-S that had been heat-inactivated, nor between Rap1A-GTP-gamma-S and hydrophobic proteins serving as controls. Complex formation between Rap1A-GTP-gamma-S and cytochrome b558 was inhibited by phosphorylation of Rap1A with cyclic adenosine monophosphate (cAMP)-dependent protein kinase. These observations suggest that Rap1A may participate in the structure or regulation of the NADPH oxidase system and that this function of the Rap1A protein may be altered by phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bokoch, G M -- Quilliam, L A -- Bohl, B P -- Jesaitis, A J -- Quinn, M T -- 5RO126711/PHS HHS/ -- GM39434/GM/NIGMS NIH HHS/ -- GM44428/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 Dec 20;254(5039):1794-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Scripps Research Institute, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1763330" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Chromatography, Gel ; Cytochrome b Group/isolation & purification/*metabolism ; GTP-Binding Proteins/antagonists & inhibitors/isolation & ; purification/*metabolism ; Guanosine 5'-O-(3-Thiotriphosphate)/metabolism ; Humans ; Kinetics ; Macromolecular Substances ; NADH, NADPH Oxidoreductases/*metabolism ; NADPH Oxidase ; Neutrophils/enzymology ; Phosphorylation ; Protein Binding ; Protein Kinase C/metabolism ; Proto-Oncogene Proteins/metabolism ; Recombinant Proteins/antagonists & inhibitors/isolation & purification/metabolism ; rap GTP-Binding Proteins
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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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    Split anergy in a CD8+ T cell: receptor-dependent cytolysis in the absence of interleukin-2 production (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-08
    Description: Engagement of the antigen-specific receptor (TCR) of CD4+ T lymphocytes without a second (costimulatory) signal prevents the subsequent production of interleukin-2 (IL-2) by these cells. Because IL-2 is a key immunoregulatory lymphokine and is also produced by a subset of CD8+ T cells that are able to kill target cells, the effect of engaging the TCR of one such clone in the absence of costimulatory signals was examined. The capacity for TCR-dependent IL-2 production was lost, indicating comparable costimulator-dependent signaling requirements for IL-2 production in CD4+ and CD8+ T cells. However, TCR-mediated cytotoxicity was not impaired, implying that costimulation is required for only certain TCR-dependent effector functions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Otten, G R -- Germain, R N -- New York, N.Y. -- Science. 1991 Mar 8;251(4998):1228-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lymphocyte Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1900952" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/immunology ; Antigen-Presenting Cells/immunology ; Antigens, CD8 ; Antigens, Differentiation, T-Lymphocyte/*immunology ; Female ; Interleukin-2/biosynthesis/*physiology ; Kinetics ; Lymphocyte Activation ; Mice ; Mice, Inbred Strains ; Ovalbumin/immunology ; Rats ; Receptors, Antigen, T-Cell/*immunology ; Spleen/immunology/radiation effects ; T-Lymphocytes/*immunology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    The roles of the subunits in the function of the calcium channel (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-09-27
    Description: Dihydropyridine-sensitive voltage-dependent L-type calcium channels are critical to excitation-secretion and excitation-contraction coupling. The channel molecule is a complex of the main, pore-forming subunit alpha 1 and four additional subunits: alpha 2, delta, beta, and gamma (alpha 2 and delta are encoded by a single messenger RNA). The alpha 1 subunit messenger RNA alone directs expression of functional calcium channels in Xenopus oocytes, and coexpression of the alpha 2/delta and beta subunits enhances the amplitude of the current. The alpha 2, delta, and gamma subunits also have pronounced effects on its macroscopic characteristics, such as kinetics, voltage dependence of activation and inactivation, and enhancement by a dihydropyridine agonist. In some cases, specific modulatory functions can be assigned to individual subunits, whereas in other cases the different subunits appear to act in concert to modulate the properties of the channel.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Singer, D -- Biel, M -- Lotan, I -- Flockerzi, V -- Hofmann, F -- Dascal, N -- New York, N.Y. -- Science. 1991 Sep 27;253(5027):1553-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Pharmacology, Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1716787" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Pyridinecarboxylic acid, ; 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ; ester/pharmacology ; Animals ; Barium/pharmacology ; *Barium Compounds ; Cadmium/pharmacology ; Cadmium Chloride ; Calcium Channels/drug effects/genetics/*physiology ; *Chlorides ; Heart/physiology ; Kinetics ; Macromolecular Substances ; Membrane Potentials/drug effects ; Oocytes/physiology ; RNA, Messenger/genetics ; Xenopus
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  • 7
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    Transducin activation by rhodopsin without a covalent bond to the 11-cis-retinal chromophore (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-01
    Description: Rhodopsin and the visual pigments are a distinct group within the family of G-protein-linked receptors in that they have a covalently bound ligand, the 11-cis-retinal chromophore, whereas all of the other receptors bind their agonists through noncovalent interactions. The retinal chromophore in rhodopsin is bound by means of a protonated Schiff base linkage to the epsilon-amino group of Lys-296. Two rhodopsin mutants have been constructed, K296G and K296A, in which the covalent linkage to the chromophore is removed. Both mutants form a pigment with an absorption spectrum close to that of the wild type when reconstituted with the Schiff base of an n-alkylamine and 11-cis-retinal. In addition, the pigment formed from K296G and the n-propylamine Schiff base of 11-cis-retinal was found to activate transducin in a light-dependent manner, with 30 to 40% of the specific activity measured for the wild-type protein. It appears that the covalent bond is not essential for binding of the chromophore or for catalytic activation of transducin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhukovsky, E A -- Robinson, P R -- 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. 1991 Feb 1;251(4993):558-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate 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/1990431" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Guanosine 5'-O-(3-Thiotriphosphate)/metabolism ; Kinetics ; Mutagenesis, Site-Directed ; Protein Binding ; Retinaldehyde/*metabolism ; Rhodopsin/genetics/*metabolism/radiation effects ; Schiff Bases ; Spectrophotometry ; Transducin/*metabolism/radiation effects
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  • 8
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    Modulation of cardiac sodium channels by cAMP receptors on the myocyte surface (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-09-13
    Description: The phosphorylation of the cardiac sodium channel by adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase A leads to its inactivation. It was shown that extracellular cAMP can also modulate the sodium channel of rat, guinea pig, and frog ventricular myocytes in a rapid (less than 50 milliseconds), reversible, and dose-dependent manner. The decrease in the sodium current was accompanied by a 10- to 15-millivolt shift in the steady-state availability of the sodium channel toward more negative potentials and was inhibited by guanosine-5'-O-(2-thiodiphosphate) or pertussis toxin, suggesting that the extracellular modulation of the sodium channel by cAMP is mediated by a membrane-delimited mechanism that includes a pertussis toxin-sensitive G protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sorbera, L A -- Morad, M -- HL16152/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1991 Sep 13;253(5025):1286-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Pennsylvania, Philadelphia 19104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1653970" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cyclic AMP/*pharmacology ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Guanosine Diphosphate/analogs & derivatives/pharmacology ; Guinea Pigs ; Heart/drug effects/*physiology ; Isoproterenol/pharmacology ; Kinetics ; Membrane Potentials/drug effects ; Pertussis Toxin ; Rana pipiens ; Rats ; Receptors, Cyclic AMP/drug effects/*physiology ; Sodium Channels/drug effects/*physiology ; Thionucleotides/pharmacology ; Virulence Factors, Bordetella/pharmacology
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  • 9
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    Cloning and expression of a cocaine-sensitive rat dopamine transporter (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-10-25
    Description: The action of dopamine and other monoamine neurotransmitters at synapses is terminated predominantly by high-affinity reuptake into presynaptic terminals by specific sodium-dependent neurotransmitter transport proteins. A complementary DNA encoding a rat dopamine transporter has been isolated that exhibits high sequence similarity with the previously cloned norepinephrine and gamma-aminobutyric acid transporters. Transient expression of the complementary DNA in HeLa cells confirms the cocaine sensitivity of this transporter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kilty, J E -- Lorang, D -- Amara, S G -- New York, N.Y. -- Science. 1991 Oct 25;254(5031):578-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Yale University, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1948035" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Carrier Proteins/drug effects/*genetics/metabolism ; Cloning, Molecular ; Cocaine/*pharmacology ; Dopamine/*metabolism ; Dopamine Plasma Membrane Transport Proteins ; Gene Expression ; HeLa Cells ; Humans ; Kinetics ; *Membrane Glycoproteins ; *Membrane Transport Proteins ; Molecular Sequence Data ; *Nerve Tissue Proteins ; Oligodeoxyribonucleotides ; Polymerase Chain Reaction/methods ; Rats ; Sequence Homology, Nucleic Acid ; Transfection
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  • 10
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    Visualizing the higher order folding of a catalytic RNA molecule (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-25
    Description: The higher order folding process of the catalytic RNA derived from the self-splicing intron of Tetrahymena thermophila was monitored with the use of Fe(II)-EDTA-induced free radical chemistry. The overall tertiary structure of the RNA molecule forms cooperatively with the uptake of at least three magnesium ions. Local folding transitions display different metal ion dependencies, suggesting that the RNA tertiary structure assembles through a specific folding intermediate before the catalytic core is formed. Enzymatic activity, assayed with an RNA substrate that is complementary to the catalytic RNA active site, coincides with the cooperative structural transition. The higher order RNA foldings produced by Mg(II), Ca(II), and Sr(II) are similar; however, only the Mg(II)-stabilized RNA is catalytically active. Thus, these results directly demonstrate that divalent metal ions participate in general folding of the ribozyme tertiary structure, and further indicate a more specific involvement of Mg(II) in catalysis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Celander, D W -- Cech, T R -- New York, N.Y. -- Science. 1991 Jan 25;251(4992):401-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1989074" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Calcium/metabolism ; Densitometry ; Kinetics ; Magnesium/metabolism ; Magnesium Chloride/pharmacology ; Molecular Sequence Data ; Nucleic Acid Conformation ; RNA, Catalytic/*chemistry/drug effects/metabolism ; Strontium/metabolism ; Tetrahymena
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