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M9550811.TXT
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1995-03-25
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Document 0811
DOCN M9550811
TI Mechanism of inhibition of HIV-1 reverse transcriptase by nonnucleoside
inhibitors.
DT 9505
AU Spence RA; Kati WM; Anderson KS; Johnson KA; Department of Biochemistry
and Molecular Biology, Pennsylvania; State University, University Park
16802.
SO Science. 1995 Feb 17;267(5200):988-93. Unique Identifier : AIDSLINE
MED/95167499
AB The mechanism of inhibition of HIV-1 reverse transcriptase by three
nonnucleoside inhibitors is described. Nevirapine, O-TIBO, and CI-TIBO
each bind to a hydrophobic pocket in the enzyme-DNA complex close to the
active site catalytic residues. Pre-steady-state kinetic analysis was
used to establish the mechanism of inhibition by these noncompetitive
inhibitors. Analysis of the pre-steady-state burst of DNA polymerization
indicated that inhibitors blocked the chemical reaction, but did not
interfere with nucleotide binding or the nucleotide-induced
conformational change. Rather, in the presence of saturating
concentrations of the inhibitors, the nucleoside triphosphate bound
tightly (Kd, 100 nM), but nonproductively. The data suggest that an
inhibitor combining the functionalities of a nonnucleoside inhibitor and
a nucleotide analog could bind very tightly and specifically to reverse
transcriptase and could be effective in the treatment of AIDS.
DE Antiviral Agents/METABOLISM/*PHARMACOLOGY
Benzodiazepines/METABOLISM/*PHARMACOLOGY Binding Sites Deoxyadenine
Nucleotides/METABOLISM DNA/METABOLISM HIV-1/DRUG EFFECTS/*ENZYMOLOGY
Imidazoles/METABOLISM/*PHARMACOLOGY Kinetics
Magnesium/METABOLISM/PHARMACOLOGY Protein Conformation
Pyridines/METABOLISM/*PHARMACOLOGY Reverse Transcriptase/*ANTAGONISTS &
INHIB/CHEMISTRY/METABOLISM Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).