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M9620382.TXT
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1996-02-26
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Document 0382
DOCN M9620382
TI Biological activity of human immunodeficiency virus type 1 Vif requires
membrane targeting by C-terminal basic domains.
DT 9602
AU Goncalves J; Shi B; Yang X; Gabuzda D; Division of Human Retrovirology,
Dana-Farber Cancer Institute,; Boston, Massachusetts 02115, USA.
SO J Virol. 1995 Nov;69(11):7196-204. Unique Identifier : AIDSLINE
MED/96013824
AB Human immunodeficiency virus type 1 (HIV-1) encodes a Vif protein which
is important for virus replication and infectivity. Vif is a cytoplasmic
protein which exists in both membrane-associated and soluble forms. The
membrane-associated form is an extrinsic membrane protein which is
tightly associated with the cytoplasmic side of membranes. We have
analyzed the mechanism of membrane targeting of Vif and its role in
HIV-1 replication. Mutagenesis studies demonstrate that C-terminal basic
domains are required for membrane association. Vif mutations which
disrupt membrane association also inhibit HIV-1 replication, indicating
that membrane localization of Vif is likely to be required for its
biological activity in vivo. Membrane binding of Vif is almost
completely abolished by trypsin treatment of membranes. These results
demonstrate that membrane localization of Vif requires C-terminal basic
domains and interaction with a membrane-associated protein(s). This
interaction may serve to direct Vif to a specific cellular site, since
immunofluorescence staining and plasma membrane fractionation studies
show that Vif is localized predominantly to an internal cytoplasmic
compartment rather than to the plasma membrane. The mechanism of
membrane targeting of Vif is different in some respects from that of
other extrinsic membrane proteins, such as Ras, Src, and MARCKS, which
utilize a basic domain together with a lipid modification for membrane
targeting. Membrane targeting of Vif is likely to play an important role
in HIV-1 replication and thus may be a therapeutic target.
DE Amino Acid Sequence Binding Sites Cell Line Cell Membrane/PHYSIOLOGY
Comparative Study CD4-Positive T-Lymphocytes Gene Products,
vif/BIOSYNTHESIS/CHEMISTRY/*METABOLISM Human
HIV-1/*PHYSIOLOGY/PATHOGENICITY Kinetics Membrane Fusion Membrane
Proteins/PHYSIOLOGY Molecular Sequence Data Mutagenesis, Site-Directed
Recombinant Proteins/BIOSYNTHESIS/CHEMISTRY/METABOLISM Support,
Non-U.S. Gov't Support, U.S. Gov't, P.H.S. Transfection *Virus
Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).