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M9640646.TXT
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1996-03-04
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Document 0646
DOCN M9640646
TI The envelope glycoprotein of human immunodeficiency virus type 2
enhances viral particle release: a Vpu-like factor?
DT 9604
AU Bour S; Schubert U; Peden K; Strebel K; Laboratory of Molecular
Microbiology, National Institute of; Allergy and Infectious Diseases,
Bethesda, Maryland 20892, USA.
SO J Virol. 1996 Feb;70(2):820-9. Unique Identifier : AIDSLINE MED/96135191
AB The Vpu protein is a human immunodeficiency virus type 1
(HIV-1)-specific accessory protein that is required for the efficient
release of viral particles from infected cells. Even though HIV-2 does
not encode Vpu, we found that this virus is nevertheless capable of
efficiently releasing virus particles. In fact, the rate of virus
release from HeLa cells transfected with a full-length molecular clone
of HIV-2, ROD10, was comparable to that observed for the vpu+ HIV-1
NL4-3 isolate and was not further enhanced by expression of Vpu in
trans. However, consistent with previous observations showing that HIV-2
particle release is Vpu responsive in the context of HIV-1/HIV-2
chimeric constructs; exchanging the gag-pol region of NL4-3 with the
corresponding region from pROD10 rendered the resulting chimeric virus
Vpu responsive. Our finding that the responsiveness of HIV-2 particle
release to Vpu is context dependent suggested the presence of a Vpu-like
factor(s) encoded by HIV-2. Using chimeric proviruses encoding HIV-2 gag
and pol in the context of the HIV-1 provirus that were coexpressed with
subgenomic HIV-2 constructs, we found that the HIV-2 envelope
glycoprotein had the ability to enhance HIV-2 particle release with an
efficiency comparable to that of the HIV-1 Vpu protein. Conversely,
inactivation of the HIV-2 env gene in the original ROD10 clone resulted
in a decrease in the rate of viral particle release to a level that was
comparable to that of Vpu-deficient HIV-1 isolates. Providing the
wild-type envelope in trans rescued the particle release defect of the
ROD10 envelope mutant. Thus, unlike HIV-1, which encodes two separate
proteins to regulate virus release or to mediate viral entry, the HIV-2
Env protein has evolved to perform both functions.
DE Cyclopentanes/PHARMACOLOGY Gene Products, nef/METABOLISM Gene
Products, vif/METABOLISM Gene Products, vpr/METABOLISM Gene Products,
vpu/DRUG EFFECTS/*METABOLISM Genes, Viral Glycoproteins/DRUG
EFFECTS/GENETICS/*METABOLISM Human HIV Seropositivity/BLOOD/IMMUNOLOGY
HIV-2/*METABOLISM Mutation Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. Viral Envelope Proteins/DRUG EFFECTS/GENETICS/*METABOLISM
Viral Regulatory Proteins/METABOLISM Virion/METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).