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M9470037.TXT
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1994-07-02
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Document 0037
DOCN M9470037
TI Sensitivity of wild-type human immunodeficiency virus type 1 reverse
transcriptase to dideoxynucleotides depends on template length; the
sensitivity of drug-resistant mutants does not.
DT 9409
AU Boyer PL; Tantillo C; Jacobo-Molina A; Nanni RG; Ding J; Arnold E;
Hughes SH; Advanced BioScience Laboratories-Basic Research Program,
National; Cancer Institute-Frederick Cancer Research and Development;
Center, MD 21702-1201.
SO Proc Natl Acad Sci U S A. 1994 May 24;91(11):4882-6. Unique Identifier :
AIDSLINE MED/94255432
AB Analysis of the three-dimensional structure of human immunodeficiency
virus type 1 (HIV-1) reverse transcriptase (RT) complexed with
double-stranded DNA indicates that while many nucleoside-resistance
mutations are not at the putative dNTP binding site, several are in
positions to interact with the template-primer. Wild-type HIV-1 RT and
two nucleoside-resistant variants, Leu74-->Val and Glu89-->Gly, have
been analyzed to determine the basis of resistance. The ability of the
wild-type enzyme to incorporate, or reject, a 2',3'-dideoxynucleoside
triphosphate (ddNTP) is strongly affected by interactions that take
place between the enzyme and the extended template strand 3-6 nt beyond
the polymerase active site. Inspection of a model of the enzyme with an
extended template suggests that this interaction involves the fingers
subdomain of the p66 subunit in the vicinity of Leu74. These data
provide direct evidence that the fingers subdomain of the p66 subunit of
HIV-1 RT interacts with the template strand. The wild-type enzyme is
resistant to ddITP if the template extension is 3 nt or less and becomes
sensitive only when the template extends more than 3 or 4 nt beyond the
end of the primer strand. However, the mutant enzymes are resistant with
both short and long template extensions. Taken together with the
three-dimensional structure of HIV-1 RT in complex with double-stranded
DNA, these data suggest that resistance to the dideoxynucleotide
inhibitors results from a repositioning or change in the conformation of
the template-primer that alters the ability of the enzyme to select or
reject an incoming dNTP.
DE Base Sequence Dideoxynucleosides/*PHARMACOLOGY Drug Resistance,
Microbial/GENETICS DNA, Viral Molecular Sequence Data Protein
Conformation Reverse Transcriptase/CHEMISTRY/*DRUG EFFECTS/GENETICS
Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S. Templates JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).