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J. Virol., Apr 1995, 2233-2239, Vol 69, No. 4
G Roderiquez, T Oravecz, M Yanagishita, DC Bou-Habib, H Mostowski and MA Norcross
The mechanism of heparan sulfate (HS)-mediated human immunodeficiency virus
type 1 (HIV-1) binding to and infection of T cells was investigated with a
clone (H9h) of the T-cell line H9 selected on the basis of its high level
of cell surface CD4 expression. Semiquantitative PCR analysis revealed that
enzymatic removal of cell surface HS by heparitinase resulted in a
reduction of the amount of HIV- 1 DNA present in H9h cells 4 h after
exposure to virus. Assays of the binding of recombinant envelope proteins
to H9h cells demonstrated a structural requirement for an oligomeric form
of gp120/gp41 for HS- dependent binding to the cell surface. The ability of
the HIV-1 envelope to bind simultaneously to HS and CD4 was shown by
immunoprecipitation of HS with either antienvelope or anti-CD4 antibodies
from 35SO4(2-)-labeled H9h cells that had been incubated with soluble
gp140. Soluble HS blocked the binding of monoclonal antibodies that
recognize the V3 and C4 domains of the envelope protein to the surface of
H9 cells chronically infected with HIV-1IIIB. The V3 domain was shown to be
the major site of envelope-HS interaction by examining the effects of both
antienvelope monoclonal antibodies and heparitinase on the binding of
soluble gp140 to H9h cells.
Copyright © 1995, American Society for Microbiology
Mediation of human immunodeficiency virus type 1 binding by interaction of cell surface heparan sulfate proteoglycans with the V3 region of envelope gp120-gp41
Division of Hematologic Products, Food and Drug Administration, Bethesda, Maryland 20892.
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