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Journal of Virology, August 2000, p. 6769-6776, Vol. 74, No. 15
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

V2 Loop Glycosylation of the Human Immunodeficiency Virus Type 1 SF162 Envelope Facilitates Interaction of This Protein with CD4 and CCR5 Receptors and Protects the Virus from Neutralization by Anti-V3 Loop and Anti-CD4 Binding Site Antibodies

Amy Ly and Leonidas Stamatatos*

Aaron Diamond AIDS Research Center, The Rockefeller University, New York, New York 10021-6399

Received 13 March 2000/Accepted 1 May 2000

We examined the role of asparagine-linked glycosylation of the V2 loop of the human immunodeficiency virus (HIV) SF162 envelope on viral replication potential and neutralization susceptibility. We report that the asparagines located at the amino- and carboxy-terminal sites (at positions 154 and 195, respectively), as well as within the V2 loop of the SF162 envelope (at position 186), are glycosylated during in vitro replication of this virus in human peripheral blood mononuclear cells. Our studies indicate that glycosylation of the V2 loop, in particular at its base, facilitates the interaction of the HIV envelope with the CD4 and CCR5 receptor molecules present on the surface of target cells and affects viral replication kinetics in a cell type-dependent manner. In cells expressing high numbers of receptor molecules on their surfaces, the SF162-derived V2 loop-deglycosylated mutant viruses replicate as efficiently as the parental SF162 virus, while in cells expressing small numbers of receptor molecules, the mutant viruses replicate with markedly reduced efficiency. In addition to expanding the viral tropism, V2 loop glycosylation at the three sites examined prevents neutralization by anti-CD4 binding site antibodies. In contrast, glycosylation at the amino- and carboxy-terminal sites of the V2 loop but not within the loop itself offers protection against anti-V3 loop antibodies. Thus, the epitopes masked by the sugar molecules present on the three glycosylation sites examined are not identical but overlap.

* Corresponding author. Mailing address: Aaron Diamond AIDS Research Center, 455 First Avenue, 7th floor, New York, NY 10016. Phone: (212) 448-5000. Fax: (212) 448-5159. E-mail: lstamata{at}adarc.org.

Journal of Virology, August 2000, p. 6769-6776, Vol. 74, No. 15
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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