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1996-03-09
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Document 0354
DOCN M9650354
TI Coexpression of a nonsyncytium inducer HIV-1 glycoprotein inhibits
syncytium formation by another HIV-1 Env protein.
DT 9605
AU Li YY; O'Donnell MA; Perez LG; Molecular Biology and Biotechnology
Program, Salem-Teikyo; University-Tampa Bay Research Institute, St.
Petersburg, Florida; 33716, USA.
SO Virology. 1996 Jan 15;215(2):197-202. Unique Identifier : AIDSLINE
MED/96146734
AB The biosynthesis and biological properties of the envelope glycoprotein
from a primary isolate of the human immunodeficiency virus type 1, HIV-1
YU2, and the Env product from the laboratory-adapted strain, HIV-1 LAI
were compared in the absence of viral replication. We found that the
level of expression and proteolytic processing into gp120/gp41 complexes
of both glycoproteins was equivalent and independent of the cell type
used. Although the two glycoproteins were detected on the surface of
HeLa cells expressing high levels of CD4, only the HIV LAI Env product
induced significant syncytium formation. Interestingly, when both
glycoproteins were coexpressed in HeLa-CD4 cells, syncytium formation
was greatly reduced. However, cell fusion could be restored by
increasing amounts of the LAI envelope gene product. HeLa-CD4 cells
expressing either glycoprotein fused with high efficiency to CEM-A
cells, a hybrid of CEM and peripheral blood mononuclear cells,
indicating that both glycoproteins were expressed in a biologically
active form on the surface of these cells. These studies suggest that
primary isolates and laboratory adapted stains may require, in addition
to the CD4 receptor, independent accessory membrane components for the
fusion activation step. Our results agree with the concept that virus
entry requires the concerted activation of each glycoprotein subunit of
the Env oligomeric complex.
DE Animal Antigens, CD4/METABOLISM Cell Line Gene Expression Regulation,
Viral Giant Cells/VIROLOGY Hela Cells Human HIV Envelope Protein
gp120/GENETICS/*PHYSIOLOGY HIV Envelope Protein
gp41/GENETICS/*PHYSIOLOGY HIV-1/*PHYSIOLOGY Membrane Fusion Membrane
Glycoproteins/GENETICS/PHYSIOLOGY Support, U.S. Gov't, P.H.S. JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).