English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Two neutralizing human monoclonal antibodies (HuMAbs) directed against epitopes located near the tip of the V3 loop of human immunodeficiency virus type 1 env protein recognized solubilized gPr160, but not gp120, in radioimmunoprecipitation assays. Efficient immunoprecipitation of solubilized gp120 by these antibodies did occur in the presence of HuMAb 1125H, directed against a conformational epitope overlapping the CD4-binding site, or its F(ab')2 fragment. In contrast to the inability of the anti-V3 antibodies to immunoprecipitate solubilized gp120, these HuMAbs did bind to gp120 in intact virions; this level of binding increased severalfold in the presence of the F(ab')2 fragment of 1125H. These results demonstrate that neutralization epitopes in the V3 loop are sequestered in soluble gp120 but partly exposed in gPr160 and in virion-associated gp120 and that binding of antibodies to the discontinuous CD4-binding site leads to conformational changes that result in the exposure of V3 epitopes in soluble gp120 and their enhanced accessibility in gPr160 and in virion-associated gp120. Enhanced binding of suboptimal concentrations of 1125H to soluble gp120 was also induced by the presence of an anti-V3 HuMAb, indicating the occurrence of reciprocal allosteric interactions between the V3 loop and the CD4-binding site. It is likely that these effects contribute to the synergistic neutralization of human immunodeficiency virus type 1 previously reported for antibodies directed against these two regions.

journal of virology

Conformational changes affecting the V3 and CD4-binding domains of human immunodeficiency virus type 1 gp120 associated with env processing and with binding of ligands to these sites