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M9620238.TXT
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1996-02-26
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Document 0238
DOCN M9620238
TI Trans-dominant inhibitory human immunodeficiency virus type 1 protease
monomers prevent protease activation and virion maturation.
DT 9602
AU Babe LM; Rose J; Craik CS; Department of Pharmaceutical Chemistry,
University of California,; San Francisco 94143, USA.
SO Proc Natl Acad Sci U S A. 1995 Oct 24;92(22):10069-73. Unique Identifier
: AIDSLINE MED/96036025
AB Production of infectious human immunodeficiency virus (HIV) requires
proper polyprotein processing by the dimeric viral protease. The
trans-dominant inhibitory activity of a defective protease monomer with
the active site Asp-25 changed to Asn was measured by transient
transfection. A proviral plasmid that included the drug-selectable
Escherichia coli gpt gene was used to deliver the wild-type (wt) or
mutant proteases to cultured cells. Coexpression of the wt proviral DNA
(HIV-gpt) with increasing amounts of the mutant proviral DNA (HIV-gpt
D25N) results in a concomitant decrease in proteolytic activity
monitored by in vivo viral polyprotein processing. The viral particles
resulting from inactivation of the protease were mostly immature,
consisting predominantly of unprocessed p55gag and p160gag-pol
polyproteins. In the presence of HIV-1 gp160 env, the number of secreted
noninfectious particles correlated with the presence of increasing
amounts of the defective protease. Greater than 97% reduction in
infectivity was observed at a 1:6 ratio of wt to defective protease DNA.
This provides an estimate of the level of inhibition required for
effectively preventing virion processing. Stable expression of the
defective protease in monkey cells reduced the yield of infectious
particles from these cells by 90% upon transfection with the wt proviral
DNA. These results show that defective subunits of the viral protease
exert a trans-dominant inhibitory effect resulting from the formation of
catalytically compromised heterodimers in vivo, ultimately yielding
noninfectious viral particles.
DE Animal Asparagine Aspartic Acid Binding Sites Cell Line
Cercopithecus aethiops DNA, Viral/METABOLISM Gene Expression Hela
Cells Human HIV Protease/BIOSYNTHESIS/*METABOLISM
HIV-1/ENZYMOLOGY/*PHYSIOLOGY Kinetics Macromolecular Systems Point
Mutation Recombinant Proteins/BIOSYNTHESIS/METABOLISM RNA,
Viral/BIOSYNTHESIS Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S.
Transfection Virion/*PHYSIOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).