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M9620571.TXT
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1996-02-26
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Document 0571
DOCN M9620571
TI Interaction of virion protein Vpr of human immunodeficiency virus type 1
with cellular transcription factor Sp1 and trans-activation of viral
long terminal repeat.
DT 9602
AU Wang L; Mukherjee S; Jia F; Narayan O; Zhao LJ; Marion Merrell Dow
Foundation, Department of Microbiology,; Molecular Genetics and
Immunology, University of Kansas Medical; Center, Kansas City
66160-7424, USA.
SO J Biol Chem. 1995 Oct 27;270(43):25564-9. Unique Identifier : AIDSLINE
MED/96029641
AB Acquired immunodeficiency syndrome (AIDS) is a result of replication of
the human immunodeficiency virus type 1 (HIV-1) predominantly in CD4+ T
lymphocytes and macrophages. However, most of these cells in vivo are
immunologically quiescent, a condition restricting HIV-1 replication.
Vpr is an HIV-1 virion protein suspected to enhance HIV-1 replication in
vivo. We demonstrate in this report that Vpr specifically activates
HIV-1 long terminal repeat (LTR)-directed transcription. This effect is
most pronounced on a minimal promoter from HIV-1 LTR containing the TATA
box and binding motifs for the ubiquitous cellular transcription factor
Sp1. Evidence is presented that Vpr interacts with Sp1 when Sp1 is bound
to the Sp1 motifs within the HIV-1 LTR Both Vpr-Sp1 interaction and Vpr
trans-activation require a central Leu/Ile-rich domain in Vpr. Our
findings suggest that Vpr trans-activation through Sp1 is most critical
for the immediate early transcription of HIV-1 when other positive
regulators, such as NF-kappa B, are limited or inactive, a condition
presumably present in vivo. By interacting with Sp1, Vpr also has the
potential to influence cellular gene expression and cellular functions.
Thus, therapeutic approaches directed toward blocking the Vpr
trans-activation function could prove valuable in treating AIDS.
DE Base Sequence Electrophoresis, Polyacrylamide Gel Gene Products,
vpr/*METABOLISM Hela Cells Human HIV Long Terminal Repeat/*GENETICS
HIV-1/*GENETICS Models, Genetic Molecular Sequence Data Precipitin
Tests Promoter Regions (Genetics)/GENETICS Protein Binding
Recombinant Proteins/METABOLISM Support, U.S. Gov't, P.H.S.
*Trans-Activation (Genetics) Transcription Factor, Sp1/*METABOLISM
Transcription, Genetic Transfection TATA Box Virion/GENETICS JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).