home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9603.zip
/
M9630529.TXT
< prev
next >
Wrap
Text File
|
1996-02-27
|
4KB
|
54 lines
Document 0529
DOCN M9630529
TI The Vif protein of human and simian immunodeficiency viruses is packaged
into virions and associates with viral core structures.
DT 9603
AU Liu H; Wu X; Newman M; Shaw GM; Hahn BH; Kappes JC; Department of
Medicine, University of Alabama at Birmingham; 35294, USA.
SO J Virol. 1995 Dec;69(12):7630-8. Unique Identifier : AIDSLINE
MED/96079008
AB The vif gene of human and simian immunodeficiency viruses (HIV and SIV)
encodes a late gene product that is essential for viral infectivity in
natural target cells. Virions produced in the absence of Vif are
abnormal in their ultrastructural morphology and are severely impaired
in the ability to complete proviral DNA synthesis upon entry into new
target cells. Because previous studies failed to detect Vif protein in
virus particles, Vif is believed to influence virus infectivity
indirectly, by affecting virion assembly, release, and/or maturation. In
this report, we reexamined the possibility that Vif is a
virion-associated protein. Utilizing high-titer Vif-specific antibodies,
a sensitive immunoblot technique, and highly concentrated virus
preparations, we detected a 23-kDa Vif-reactive protein in wild-type HIV
type 1 (HIV-1) and a 27-kDa Vif-reactive protein in wild-type SIVSM
virions. Neither protein was present in virions derived from
vif-deficient HIV-1 and SIVSM proviral constructs. Vif protein content
was similar among different strains of HIV-1 and was independent of the
cell type (permissive or nonpermissive) used to produce the virus. To
determine the subvirion localization of Vif, HIV-1 virions were treated
with proteinase K or Triton X-100 to remove virion surface proteins and
the viral membrane, respectively, purified through sucrose, and analyzed
by immunoblot analysis. Vif protein content was not affected by the
removal of external surface proteins or by the removal of the viral
membrane and submembrane p17Gag matrix protein. Instead, Vif colocalized
with viral core structures which sedimented at a density of 1.25 g/ml on
linear sucrose gradients (enveloped HIV-1 particles sediment at a
density of 1.17 g/ml). Finally, the amount of Vif protein packaged into
virions was estimated to be on the order of 1 molecule of Vif for every
20 to 30 molecules of p24Gag, or between 60 and 100 molecules of Vif per
particle. These results indicate that Vif represents an integral
component of HIV and SIV particles and raise the possibility that it
plays a direct role in early replication events.
DE Amino Acid Sequence Antibodies Base Sequence Comparative Study DNA
Primers DNA Replication DNA, Viral/BIOSYNTHESIS Gene Deletion Gene
Products, vif/ANALYSIS/*BIOSYNTHESIS *Genes, vif Hela Cells Human
HIV/GENETICS/*METABOLISM HIV-2/GENETICS/METABOLISM Molecular Sequence
Data Mutagenesis Peptide Fragments/CHEMISTRY/IMMUNOLOGY Polymerase
Chain Reaction Proviruses/GENETICS/METABOLISM Recombinant
Proteins/ANALYSIS/BIOSYNTHESIS Support, U.S. Gov't, Non-P.H.S.
Support, U.S. Gov't, P.H.S. SIV/GENETICS/*METABOLISM Transfection
Virion/GENETICS/*METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).