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M9650526.TXT
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1996-03-09
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Document 0526
DOCN M9650526
TI Effect of human immunodeficiency virus type 1 (HIV-1) nucleocapsid
protein on HIV-1 reverse transcriptase activity in vitro.
DT 9605
AU Ji X; Klarmann GJ; Preston BD; Department of Biochemistry, University of
Utah, Salt Lake City; 84112, USA.
SO Biochemistry. 1996 Jan 9;35(1):132-43. Unique Identifier : AIDSLINE
MED/96134828
AB Conversion of human immunodeficiency virus type 1 (HIV-1) genomic RNA to
viral DNA is a requisite step in the virus life cycle. This conversion
is catalyzed by reverse transcriptase (RT) associated with a large
nucleoprotein complex composed of several viral proteins including
nucleocapsid (NC). To better characterize the biochemical mechanisms of
viral DNA synthesis, we overexpressed and purified recombinant HIV-1 NC
and studied its effect on the activity and processivity of HIV-1 RT
during polymerization of HIV-1 template sequences in vitro. The effect
of NC on steady-state RT activity was dependent on the order of addition
of reaction components. Addition of NC prior to formation of
RT-primer.template-dNTP ternary complexes inhibited primer extension and
reduced total product yields by slowing steady-state RT turnover. In
contrast, addition of NC to preformed ternary complexes resulted in
efficient primer extension and increased RT processivity at specific DNA
template sites. NC stimulated polymerization (2-4 times) through eight
of 13 sites examined in the cRRE region of HIV-1 env and increased the
rate of polymerization through the D3/CTS region of HIV-1 pol 10 times.
The data suggest that NC affects RT processivity by facilitating
polymerization through regions of template secondary structure. Thus, NC
functions as a single-strand binding (SSB)-like accessory replication
factor for RT in vitro and may be part of a multicomponent retroviral
replication complex.
DE Base Sequence Binding Sites Capsid/*PHARMACOLOGY DNA Primers
Electrophoresis, Polyacrylamide Gel Human HIV-1/*METABOLISM
Macromolecular Systems Molecular Sequence Data Molecular Weight
Polymerase Chain Reaction Recombinant Proteins/CHEMISTRY/ISOLATION &
PURIF/METABOLISM RNA-Directed DNA Polymerase/CHEMISTRY/ISOLATION &
PURIF/ *METABOLISM Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. Templates Viral Core Proteins/*PHARMACOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).