Rapid Progression to Simian AIDS Can Be Accompanied by Selection of CD4-independent Gp120 Variants with Impaired Ability to Bind CD4

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2002 Jul 5

PMID 12097605

Citations 16

Authors

Elena Ryzhova

J Charles Whitbeck

Gabriela Canziani

Susan V Westmoreland

Gary H Cohen

Roselyn J Eisenberg

Andrew Lackner

Francisco Gonzalez-Scarano

Affiliations

Soon will be listed here.

Abstract

Aspartate 368 on human immunodeficiency virus type 1 (HIV-1) gp120 forms multiple contacts with CD4; in mutagenesis studies, its replacement by asparagine and corresponding changes in simian immunodeficiency virus SIVmac (D385N) reduced binding with CD4. Nevertheless, simian immunodeficiency virus envelopes with D385N were prevalent in several studies. Extending these observations, we also found D385N to be dominant among env clones from two rhesus macaques that progressed rapidly to simian AIDS. These envelopes showed a CD4-independent phenotype as well as reduced affinity to CD4. Moreover, an adjacent change, G383R, which was frequently coselected with D385N, further decreased binding. An optical biosensor study demonstrated that the SIVmac239 gp120 bound to CD4 with kinetics similar to those of HIV-1. However, the gp120s with D385N and G383R showed a 40-fold reduction in affinity, with a drastic increase in dissociation rate, indicating an inherently unstable complex. This finding showed that rapid progression to simian AIDS may be accompanied by the selection of CD4-independent gp120 variants with impaired CD4 binding ability.

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