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M9550009.TXT
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1995-03-04
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Document 0009
DOCN M9550009
TI Resistance of human immunodeficiency virus type 1 to acyclic
6-phenylselenenyl- and 6-phenylthiopyrimidines.
DT 9505
AU Nguyen MH; Schinazi RF; Shi C; Goudgaon NM; McKenna PM; Mellors JW;
Department of Medicine, University of Pittsburgh School of; Medicine,
Pennsylvania.
SO Antimicrob Agents Chemother. 1994 Oct;38(10):2409-14. Unique Identifier
: AIDSLINE MED/95142586
AB Acyclic 6-phenylselenenyl- and 6-phenylthiopyrimidine derivatives are
potent and specific inhibitors of human immunodeficiency virus type 1
(HIV-1). The development of in vitro resistance to two derivatives,
5-ethyl-1-(ethoxymethyl)-(6-phenylthio)-uracil (E-EPU), was evaluated by
serial passage of HIV-1 in increasing concentrations of inhibitor. HIV-1
variants exhibiting > 500-fold resistance to E-EPSeU and E-EPU were
isolated after sequential passage in 1, 5, and 10 microM inhibitor. The
resistant variants exhibited coresistance to related acyclic
6-substituted pyrimidines and the HIV-1-specific inhibitors
(+)-(5S)-4,5,6,7-tetrahydro-5- pyrimidines and the HIV-1-specific
inhibitors (+)-(5S)-4,5,6,7-tetrahydro-5-
methyl-6-(3-methyl-2-butenyl)imidazo[4,5,1-jk]benzodiazepin-2(1H)-
thione (TIBO R82150) and nevirapine, but remained susceptible to
3'-azido-3'-deoxythymidine, 2',3'-dideoxycytidine, 2',3'-dideoxyinosine,
and phosphonoformic acid. DNA sequence analysis of reverse transcriptase
(RT) derived from E-EPSeU-resistant virus identified a Tyr (TAT)-to-Cys
(TGT) mutation at either codon 188 (Cys-188; 9 of 15 clones) or codon
181 (Cys-181; 5 of 15 clones). The same amino acid changes were found in
RT from E-EPU-resistant virus, but the Cys-181 mutation was more common
(9 of 10 clones) than the Cys-188 mutation (1 of 10 clones).
Site-specific mutagenesis and production of mutant recombinant viruses
demonstrated that both the Cys-181 and Cys-188 mutations cause
resistance to E-EPSeU and E-EPU. Of the two mutations, the Cys-188
substitution produced greater E-EPSeU and E-EPU resistance.(ABSTRACT
TRUNCATED AT 250 WORDS)
DE Antiviral Agents/*PHARMACOLOGY Drug Resistance/GENETICS Human
HIV-1/*DRUG EFFECTS/GENETICS Mutation Organoselenium
Compounds/*PHARMACOLOGY Structure-Activity Relationship
Uracil/*ANALOGS & DERIVATIVES/PHARMACOLOGY Zidovudine/PHARMACOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).