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1996-02-27
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Document 0106
DOCN M9630106
TI Cytoskeleton association and virion incorporation of the human
immunodeficiency virus type 1 Vif protein.
DT 9603
AU Karczewski MK; Strebel K; Laboratory of Molecular Microbiology, National
Institute of; Allergy and Infectious Diseases, Bethesda, Maryland
20892-0460,; USA.
SO J Virol. 1996 Jan;70(1):494-507. Unique Identifier : AIDSLINE
MED/96099464
AB The human immunodeficiency virus type 1 (HIV-1) Vif protein has an
important role in the regulation of virus infectivity. This function of
Vif is cell type specific, and virions produced in the absence of Vif in
restrictive cells have greatly reduced infectivity. We show here that
the intracellular localization of Vif is dependent on the presence of
the intermediate filament vimentin. Fractionation of acutely infected T
cells or transiently transfected HeLa cells demonstrates the existence
of a soluble and a cytoskeletal form and to a lesser extent the presence
of a detergent-extractable form of Vif. Confocal microscopy suggests
that in HeLa cells, Vif is predominantly present in the cytoplasm and
closely colocalizes with the intermediate filament vimentin. Treatment
of cells with drugs affecting the structure of vimentin filaments affect
the localization of Vif accordingly, indicating a close association of
Vif with this cytoskeletal component. The association of Vif with
vimentin can cause the collapse of the intermediate filament network
into a perinuclear aggregate. In contrast, analysis of Vif in
vimentin-negative cells reveals significant staining of the nucleus and
the nuclear membrane in addition to diffuse cytoplasmic staining. In
addition to the association of Vif with intermediate filaments, analyses
of virion preparations demonstrate that Vif is incorporated into virus
particles. In sucrose density gradients, Vif cosediments with capsid
proteins even after detergent treatment of virus preparations,
suggesting that Vif is associated with the inner core of HIV particles.
We propose a model in which Vif has a crucial function as a virion
component either by regulating virus maturation or following virus entry
into a host cell possibly involving an interaction with the cellular
cytoskeletal network.
DE Animal Base Sequence Cell Line Cytoskeleton/METABOLISM/*VIROLOGY
DNA, Viral Gene Products, vif/*METABOLISM Hela Cells Human HIV
Seropositivity/BLOOD/IMMUNOLOGY HIV-1/*METABOLISM Molecular Sequence
Data Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S. Tumor Cells,
Cultured Vimentin/*METABOLISM Virion/METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).