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Document 0496
DOCN M9490496
TI Inhibition of HIV-1 integrase by flavones, caffeic acid phenethyl ester
(CAPE) and related compounds.
DT 9411
AU Fesen MR; Pommier Y; Leteurtre F; Hiroguchi S; Yung J; Kohn KW;
Laboratory of Molecular Pharmacology, National Cancer Institute,;
National Institutes of Health, Bethesda, MD 20892.
SO Biochem Pharmacol. 1994 Aug 3;48(3):595-608. Unique Identifier :
AIDSLINE MED/94347147
AB The inhibition of HIV-1 integrase by flavones and related compounds was
investigated biochemically and by means of structure-activity
relationships. Purified enzyme and synthetic oligonucleotides were used
to assay for three reactions catalysed by integrase: (1) processing of
3' termini by cleavage of the terminal dinucleotide; (2) strand
transfer, which models the integration step; and (3) disintegration,
which models the reversal of the strand transfer reaction. Inhibitions
of all three reactions by flavones generally occurred in parallel, but
caffeic acid phenethyl ester (CAPE) appeared to inhibit reaction 2
selectively. CAPE, however, inhibited reactions 1 and 3 effectively when
preincubated with the enzyme, suggesting that this compound differs from
the flavones primarily in requiring more time to block the enzyme. The
core integrase fragment consisting of amino acids 50-212 retained the
ability to catalyse reaction 3, and flavones and CAPE retained the
ability to inhibit. Hence, the putative zinc-finger region that is
deleted in this fragment is probably not the target of inhibition.
Inhibition by flavones usually required the presence of at least one
ortho pair of phenolic hydroxyl groups and at least one or two
additional hydroxyl groups. Potency was enhanced by the presence of
additional hydroxyl groups, especially when present in ortho pairs or in
adjacent groups of three. Inhibitory activity was reduced or eliminated
by methoxy or glycosidic substitutions or by saturation of the 2,3
double bond. These structure-activity findings for flavones were
generally concordant with those previously reported for reverse
transcriptase and topoisomerase II. These findings are discussed in the
context of a review of the effects of flavones on various enzymes, the
possible mechanisms of inhibition, and the potential for building upon a
general pharmacophore to generate target specificity.
DE Base Sequence Caffeic Acids/*PHARMACOLOGY Cations, Divalent
Comparative Study Dose-Response Relationship, Drug DNA/DRUG EFFECTS
DNA Nucleotidyltransferases/*ANTAGONISTS & INHIB/GENETICS
Flavones/*PHARMACOLOGY HIV-1/*ENZYMOLOGY Kinetics Molecular Sequence
Data Oligonucleotides/METABOLISM Phenethyl Alcohol/*ANALOGS &
DERIVATIVES/PHARMACOLOGY Structure-Activity Relationship JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).