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M9550011.TXT
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1995-03-04
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Document 0011
DOCN M9550011
TI Inhibition of human immunodeficiency virus type 1 reverse transcriptase
by the 5'-triphosphate beta enantiomers of cytidine analogs.
DT 9505
AU Faraj A; Agrofoglio LA; Wakefield JK; McPherson S; Morrow CD; Gosselin
G; Mathe C; Imbach JL; Schinazi RF; Sommadossi JP; Department of
Pharmacology, University of Alabama at Birmingham; 35294.
SO Antimicrob Agents Chemother. 1994 Oct;38(10):2300-5. Unique Identifier :
AIDSLINE MED/95142567
AB (-)-beta-L-2',3'-Dideoxycytidine (L-ddC) and
(-)-beta-L-2',3'-dideoxy-5-fluorocytidine (L-FddC) have been reported to
be potent and selective inhibitors of human immunodeficiency virus type
1 (HIV-1) and type 2 (HIV-2) in vitro. In the present study, the
5'-triphosphates of L-ddC (L-ddCTP) and L-FddC (L-FddCTP) were
demonstrated to competitively inhibit HIV-1 reverse transcriptase (RT),
with inhibition constants (KiS) of 2 and 1.6 microM, respectively, when
a poly(rI).oligo(dC)10-15 template primer was used; in comparison Ki
values for beta-D-2',3'-dideoxycytidine 5'-triphosphate (D-ddCTP) and
beta-D-2',3'-dideoxy-5-fluorocytidine 5'-triphosphate (D-FddCTP) were
1.1 and 1.4 microM, respectively. Use of the mutant RT at position 184
(substitution of methionine to valine [M184V]), which is associated with
resistance to beta-L-2',3'-dideoxy-3'-thiacytidine (3TC) and
beta-L-2',3'-dideoxy-5-fluoro-3'-thiacytidine (FTC), resulted in
significant increases (50- to 60-fold) in Ki values for L-ddCTP and
L-FddCTP, whereas the elevation in Ki values for D-ddCTP and D-FddCTP
was moderate (2-fold). L-ddCTP and L-FddCTP did not inhibit human DNA
polymerases alpha and beta up to 100 microM. In contrast, D-ddCTP and
D-FddCTP inhibited human DNA polymerase beta, with Ki values of 0.5 and
2.5 microM, respectively. By using sequencing analysis, L-ddCTP and
L-FddCTP exhibited DNA chain-terminating activities toward the parental
HIV-1 RT, whereas they were not a substrate for the mutant M184V HIV-1
RT.(ABSTRACT TRUNCATED AT 250 WORDS)
DE Antiviral Agents/*PHARMACOLOGY Base Sequence Cells, Cultured
Deoxycytosine Nucleotides/*PHARMACOLOGY DNA/METABOLISM DNA Polymerase
I/ANTAGONISTS & INHIB DNA, Mitochondrial/ANALYSIS Molecular Sequence
Data Reverse Transcriptase/*ANTAGONISTS & INHIB Stereoisomers
Support, Non-U.S. Gov't Support, U.S. Gov't, Non-P.H.S. Support, U.S.
Gov't, P.H.S. Zalcitabine/*ANALOGS & DERIVATIVES/PHARMACOLOGY JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).