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M9480065.TXT
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1994-08-09
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Document 0065
DOCN M9480065
TI Human immunodeficiency virus 1 (HIV-1)-specific reverse transcriptase
(RT) inhibitors may suppress the replication of specific drug-resistant
(E138K)RT HIV-1 mutants or select for highly resistant (Y181C-->C181I)RT
HIV-1 mutants.
DT 9410
AU Balzarini J; Karlsson A; Sardana VV; Emini EA; Camarasa MJ; De Clercq E;
Rega Institute for Medical Research, Katholieke Universiteit; Leuven,
Belgium.
SO Proc Natl Acad Sci U S A. 1994 Jul 5;91(14):6599-603. Unique Identifier
: AIDSLINE MED/94294426
AB Mutant HIV-1 that expresses a Glu138-->Lys substitution in its RT
[(E138K)RT] is resistant to the HIV-1-specific RT inhibitor
2',5'-bis-O-(tert-butyldimethylsilyl)-3'-spiro-5-(4-amino-1,2-
oxathiole-2,2-dioxide)pyrimidine (TSAO). However, cell cultures infected
with this mutant were completely protected against virus-mediated
destruction by micromolar concentrations of the HIV-1-specific RT
inhibitors tetrahydroimidazo[4,5,1-jk][1,4]benzodiazepin-2(1H)-one and
thione (TIBO), nevirapine, and bis(heteroaryl)piperazine (BHAP). In
contrast, cells infected with a virus mutant that expresses a
Tyr181-->Cys substitution in its RT [(Y181C)RT] were not protected by
nevirapine and TIBO and were only temporarily protected by BHAP. HIV-1
mutant that emerged under the latter conditions contained a Cys181-->Ile
substitution in their RT [(LC181I)RT]. This mutant proved highly
resistant to all HIV-1-specific RT inhibitors tested, except for several
1-(2-hydroxyethoxymethyl)-6-(phenylthio)thymine (HEPT) derivatives. When
recombinant (C181I)RT was evaluated for susceptibility to the
HIV-1-specific RT inhibitors, it was resistant to all inhibitors except
the HEPT compounds. Since a (Y181F)RT HIV mutant strain was isolated
from cells infected with (Y181C)RT HIV-1 and treated with BHAP, we
postulate that the Ile codon was derived from a Cys-->Phe transversion
mutation (TGT-->TTT), followed by a Phe-->Ile transversion mutation
(TTT-->ATT).
DE Amino Acid Sequence Antiviral Agents/*TOXICITY Base Sequence
Benzodiazepines/TOXICITY Cell Line Codon/GENETICS Comparative Study
DNA Primers Human HIV-1/*DRUG EFFECTS/*ENZYMOLOGY/PHYSIOLOGY
Imidazoles/TOXICITY Kinetics Molecular Sequence Data *Point Mutation
Polymerase Chain Reaction Pyridines/TOXICITY Pyridones/TOXICITY
Reverse Transcriptase/*ANTAGONISTS & INHIB/GENETICS Structure-Activity
Relationship Support, Non-U.S. Gov't Thymidine/ANALOGS &
DERIVATIVES/TOXICITY Virus Replication/*DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).