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  • Analytical Chemistry and Spectroscopy
  • Chemical Engineering
  • Chemistry
  • American Association for the Advancement of Science (AAAS)  (12)
  • 1985-1989  (12)
  • 1988  (12)
Collection
Keywords
Publisher
Years
  • 1985-1989  (12)
Year
  • 1
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    Characterization of a helical protein designed from first principles (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-08-19
    Description: The question of how the primary amino acid sequence of a protein determines its three-dimensional structure is still unanswered. One approach to this problem involves the de novo design of model peptides and proteins that should adopt desired three-dimensional structures. A systematic approach was aimed at the design of a four-helix bundle protein. The gene encoding the designed protein was synthesized and the protein was expressed in Escherichia coli and purified to homogeneity. The protein was shown to be monomeric, highly helical, and very stable to denaturation by guanidine hydrochloride (GuHCl). Thus a globular protein has been designed that is capable of adopting a stable, folded structure in aqueous solution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Regan, L -- DeGrado, W F -- New York, N.Y. -- Science. 1988 Aug 19;241(4868):976-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉E. I. du Pont de Nemours & Company, Central Research & Development Department, Wilmington, DE 19898.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3043666" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Chemical Phenomena ; Chemistry ; Chromatography, Gel ; Escherichia coli/genetics ; Molecular Sequence Data ; Plasmids ; *Protein Conformation ; *Proteins/genetics
    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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    DNA binding by proteins (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-02
    Description: Study of proteins that recognize specific DNA sequences has yielded much information, but the field is still in its infancy. Already two major structural motifs have been discovered, the helix-turn-helix and zinc finger, and numerous examples of DNA-binding proteins containing either of them are known. The restriction enzyme Eco RI uses yet a different motif. Additional motifs are likely to be found as well. There is a growing understanding of some of the physical chemistry involved in protein-DNA binding, but much remains to be learned before it becomes possible to engineer a protein that binds to a specific DNA sequence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schleif, R -- New York, N.Y. -- Science. 1988 Sep 2;241(4870):1182-7.〈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/2842864" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/metabolism ; Binding Sites ; Chemical Phenomena ; Chemistry ; DNA/metabolism ; DNA Restriction Enzymes/metabolism ; DNA-Binding Proteins/*metabolism ; Deoxyribonuclease EcoRI ; Electrochemistry ; Nucleic Acids/metabolism ; Protein Conformation ; Zinc
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  • 3
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    Introduction of nucleophiles and spectroscopic probes into antibody combining sites (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-18
    Description: A general chemical strategy has been developed whereby antibody combining sites can be selectively derivatized with natural or synthetic molecules, such as catalytic groups, drugs, metals, or reporter molecules. Cleavable affinity labels were used to selectively introduce a thiol into the combining site of the immunoglobulin A MOPC 315. This thiol acted both as a nucleophile to accelerate ester thiolysis 60,000-fold and as a handle for selectively derivatizing the antibody with additional functional groups. For example, derivatization of the antibody with a fluorophore made possible a direct spectroscopic assay of antibody-ligand complexation. This chemistry should not only extend our ability to exploit antibody specificity in chemical catalysis, diagnostics, and therapeutics, but may also prove generally applicable to the functional modification of other proteins for which detailed structural information is unavailable.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pollack, S J -- Nakayama, G R -- Schultz, P G -- AI24695-02/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 Nov 18;242(4881):1038-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3194752" target="_blank"〉PubMed〈/a〉
    Keywords: Affinity Labels ; Animals ; *Antigen-Antibody Reactions ; *Binding Sites, Antibody ; Chemical Phenomena ; Chemistry ; Dinitrobenzenes ; Immunoglobulin Fab Fragments ; Mice ; Spectrometry, Fluorescence ; Sulfhydryl Compounds
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  • 4
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    Insights into enzyme function from studies on mutants of dihydrofolate reductase (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-03-04
    Description: Kinetic analysis and protein mutagenesis allow the importance of individual amino acids in ligand binding and catalysis to be assessed. A kinetic analysis has shown that the reaction catalyzed by dihydrofolate reductase is optimized with respect to product flux, which in turn is predetermined by the active-site hydrophobic surface. Protein mutagenesis has revealed that specific hydrophobic residues contribute 2 to 5 kilocalories per mole to ligand binding and catalysis. The extent to which perturbations within this active-site ensemble may affect catalysis is discussed in terms of the constraints imposed by the energy surface for the reaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benkovic, S J -- Fierke, C A -- Naylor, A M -- GM24129/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Mar 4;239(4844):1105-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Pennsylvania State University, University Park 16802.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3125607" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Catalysis ; Chemical Phenomena ; Chemistry ; Escherichia coli/enzymology ; Kinetics ; Lactobacillus casei/enzymology ; *Mutation ; Structure-Activity Relationship ; Tetrahydrofolate Dehydrogenase/genetics/*metabolism ; Thermodynamics
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  • 5
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    Induction of an antibody that catalyzes the hydrolysis of an amide bond (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-02
    Description: Catalysis of amide bond hydrolysis is of singular importance in enzymology. An antibody was induced to an analog of a high-energy intermediate anticipated along the reaction coordinate of amide hydrolysis. This antibody is an amidase with high specificity and a large rate enhancement (250,000) relative to the uncatalyzed reaction. This reaction represents the kinetically most difficult hydrolysis reaction yet catalyzed by an antibody.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janda, K D -- Schloeder, D -- Benkovic, S J -- Lerner, R A -- New York, N.Y. -- Science. 1988 Sep 2;241(4870):1188-91.〈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/3413482" target="_blank"〉PubMed〈/a〉
    Keywords: Amidohydrolases/metabolism ; Animals ; Antibodies, Monoclonal/biosynthesis/*physiology ; Antibody Specificity ; Antigens/immunology ; *Catalysis ; Chemical Phenomena ; Chemistry ; Hemocyanin/analogs & derivatives/immunology ; Hydrolysis ; Immunization ; Kinetics ; Mice ; Organophosphorus Compounds/immunology ; Substrate Specificity
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  • 6
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    The S1-sensitive form of d(C-T)n.d(A-G)n: chemical evidence for a three-stranded structure in plasmids (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-30
    Description: Homopurine-homopyrimidine sequences that flank certain actively transcribed genes are hypersensitive to single strand-specific nucleases such as S1. This has raised the possibility that an unusual structure exists in these regions that might be involved in recognition or regulation. Several of these sequences, including d(C-T)n.d(A-G)n, are known to undergo a transition in plasmids to an underwound state that is hypersensitive to single strand-specific nucleases; this transition occurs under conditions of moderately acid pH and negative supercoiling. Chemical probes were used to examine the reactivity of a restriction fragment from a human U1 gene containing the sequence d(C-T)18.d(A-G)18 as a function of supercoiling and pH, and thus analyze the structure in this region. Hyperreactivity was seen in the center and at one end of the (C-T)n tract, and continuously from the center to the same end of the (A-G)n tract, in the presence of supercoiling and pH less than or equal to 6.0. These results provide strong support for a triple-helical model recently proposed for these sequences and are inconsistent with other proposed structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnston, B H -- New York, N.Y. -- Science. 1988 Sep 30;241(4874):1800-4.〈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/2845572" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Chemical Phenomena ; Chemistry ; *Dna ; DNA, Superhelical ; Endonucleases/*metabolism ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; *Nucleic Acid Conformation ; Plasmids ; Single-Strand Specific DNA and RNA Endonucleases
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  • 7
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    Structural and functional roles of glycosyl-phosphatidylinositol in membranes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-15
    Description: Glycosylated forms of phosphatidylinositol, which have only recently been described in eukaryotic organisms, are now known to play important roles in biological membrane function. These molecules can serve as the sole means by which particular cell-surface proteins are anchored to the membrane. Lipids with similar structures may also be involved in signal transduction mechanisms for the hormone insulin. The utilization of this novel class of lipid molecules for these two distinct functions suggests new mechanisms for the regulation of proteins in biological membranes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Low, M G -- Saltiel, A R -- DK33804/DK/NIDDK NIH HHS/ -- GM35873/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 15;239(4837):268-75.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Cellular Biophysics, College of Physicians and Surgeons of Columbia University, New York, NY 10032.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3276003" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/*physiology ; Chemical Phenomena ; Chemistry ; Glycolipids/biosynthesis/*physiology ; Glycosylation ; Humans ; Hydrolysis ; Insulin/physiology ; Membrane Lipids/physiology ; Membrane Proteins/physiology ; Phosphatidylinositols/biosynthesis/*physiology ; Phospholipases/metabolism ; Phospholipid Ethers/biosynthesis/physiology ; Trypanosoma brucei brucei/metabolism
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  • 8
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    The design of molecular hosts, guests, and their complexes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-05-06
    Description: The origins, definitions, tools, and guiding principles of host-guest chemistry are developed. Perching, nesting, and capsular complexes are exemplified through molecular model and crystal structure comparisons. The degree of preorganization of a host for binding is a central determinant of its binding power. Complementarity of binding site placement in host and guest is a central determinant of structural recognition in complexation. Examples are given of chiral recognition in complexation, of partial transacylase mimics, of caviplexes, and of a synthetic molecular cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cram, D J -- New York, N.Y. -- Science. 1988 May 6;240(4853):760-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, University of California, Los Angeles 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3283937" target="_blank"〉PubMed〈/a〉
    Keywords: Acylation ; Binding Sites ; Chemical Phenomena ; Chemistry ; Crystallization ; Enzymes ; *Models, Chemical ; Models, Molecular ; Nucleic Acids ; Thermodynamics
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  • 9
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    Toxic DNA damage by hydrogen peroxide through the Fenton reaction in vivo and in vitro (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-29
    Description: Exposure of Escherichia coli to low concentrations of hydrogen peroxide results in DNA damage that causes mutagenesis and kills the bacteria, whereas higher concentrations of peroxide reduce the amount of such damage. Earlier studies indicated that the direct DNA oxidant is a derivative of hydrogen peroxide whose formation is dependent on cell metabolism. The generation of this oxidant depends on the availability of both reducing equivalents and an iron species, which together mediate a Fenton reaction in which ferrous iron reduces hydrogen peroxide to a reactive radical. An in vitro Fenton system was established that generates DNA strand breaks and inactivates bacteriophage and that also reproduces the suppression of DNA damage by high concentrations of peroxide. The direct DNA oxidant both in vivo and in this in vitro system exhibits reactivity unlike that of a free hydroxyl radical and may instead be a ferryl radical.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Imlay, J A -- Chin, S M -- Linn, S -- GM19020/GM/NIGMS NIH HHS/ -- P30ES01896/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 29;240(4852):640-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2834821" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteriophage lambda ; Chemical Phenomena ; Chemistry ; *DNA Damage ; DNA Repair ; DNA, Bacterial/*drug effects ; Escherichia coli/drug effects/*genetics ; Ferrous Compounds ; Free Radicals ; Hydrogen Peroxide/administration & dosage/*pharmacology ; Hydrogen-Ion Concentration ; Hydroxides ; Hydroxyl Radical ; Oxidation-Reduction
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  • 10
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    DNA damage and oxygen radical toxicity (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-06-03
    Description: A major portion of the toxicity of hydrogen peroxide in Escherichia coli is attributed to DNA damage mediated by a Fenton reaction that generates active forms of hydroxyl radicals from hydrogen peroxide, DNA-bound iron, and a constant source of reducing equivalents. Kinetic peculiarities of DNA damage production by hydrogen peroxide in vivo can be reproduced by including DNA in an in vitro Fenton reaction system in which iron catalyzes the univalent reduction of hydrogen peroxide by the reduced form of nicotinamide adenine dinucleotide (NADH). To minimize the toxicity of oxygen radicals, the cell utilizes scavengers of these radicals and DNA repair enzymes. On the basis of observations with the model system, it is proposed that the cell may also decrease such toxicity by diminishing available NAD(P)H and by utilizing oxygen itself to scavenge active free radicals into superoxide, which is then destroyed by superoxide dismutase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Imlay, J A -- Linn, S -- New York, N.Y. -- Science. 1988 Jun 3;240(4857):1302-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of California, Berkeley.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3287616" target="_blank"〉PubMed〈/a〉
    Keywords: Chemical Phenomena ; Chemistry ; *DNA Damage ; DNA, Bacterial/*drug effects ; Escherichia coli/drug effects/*genetics ; Free Radicals ; Hydrogen Peroxide/*pharmacology ; Iron ; NAD/metabolism ; Oxidation-Reduction ; Oxygen/*metabolism
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  • 11
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    Escherichia coli aspartate transcarbamylase: the relation between structure and function (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-08-05
    Description: The x-ray structures of the allosteric enzyme aspartate transcarbamylase from Escherichia coli have been solved and refined for both allosteric forms. The T form was determined in the presence of the heterotropic inhibitor cytidine triphosphate, CTP, while the R form was determined in the presence of the bisubstrate analog N-phosphonacetyl-L-aspartate. These two x-ray structures provide the starting point for an understanding of how allosteric enzymes are able to control the rates of metabolic pathways. Insights into the mechanisms of both catalysis and homotropic cooperativity have been obtained by using site-directed mutagenesis to probe residues thought to be critical to the function of the enzyme based on these x-ray structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kantrowitz, E R -- Lipscomb, W N -- GM 06920/GM/NIGMS NIH HHS/ -- GM26237/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Aug 5;241(4866):669-74.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Boston College, MA 02167.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3041592" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Allosteric Site ; Aspartate Carbamoyltransferase/*physiology ; Binding Sites ; Chemical Phenomena ; Chemistry ; Escherichia coli/*enzymology ; Macromolecular Substances ; Protein Conformation ; Structure-Activity Relationship
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  • 12
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    Structure of the lambda complex at 2.5 A resolution: details of the repressor-operator interactions (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-11
    Description: The crystal structure of a complex containing the DNA-binding domain of lambda repressor and a lambda operator site was determined at 2.5 A resolution and refined to a crystallographic R factor of 24.2 percent. The complex is stabilized by an extensive network of hydrogen bonds between the protein and the sugar-phosphate backbone. Several side chains form hydrogen bonds with sites in the major groove, and hydrophobic contacts also contribute to the specificity of binding. The overall arrangement of the complex is quite similar to that predicted from earlier modeling studies, which fit the protein dimer against linear B-form DNA. However, the cocrystal structure reveals important side chain-side chain interactions that were not predicted from the modeling or from previous genetic and biochemical studies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jordan, S R -- Pabo, C O -- GM-31471/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Nov 11;242(4880):893-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biophysics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3187530" target="_blank"〉PubMed〈/a〉
    Keywords: Base Composition ; Base Sequence ; Binding Sites ; Chemical Phenomena ; Chemistry ; Crystallization ; DNA/*metabolism ; *DNA-Binding Proteins ; Glutamine/metabolism ; Hydrogen Bonding ; Molecular Sequence Data ; Molecular Structure ; Nucleic Acid Conformation ; *Operator Regions, Genetic ; Protein Binding ; Protein Conformation ; Repressor Proteins/genetics/*metabolism ; Sugar Phosphates/metabolism ; Transcription Factors/*metabolism ; Viral Proteins ; Viral Regulatory and Accessory Proteins
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