Abstract
The entry of human immunodeficiency virus type 1 (HIV-1) into target cells involves binding to the viral receptor (CD4) and membrane fusion events, the latter influenced by target cell factors other than CD4. The third variable (V3) region of the HIV-1 gp120 exterior envelope glycoprotein and the amino terminus of the HIV-1 gp41 transmembrane envelope glycoprotein have been shown to be important for the membrane fusion process. Here we demonstrate that some HIV-1 envelope glycoproteins containing an altered V3 region or gp41 amino terminus exhibit qualitatively different abilities to mediate syncytium formation and virus entry when different target cells are used. These results demonstrate that the structure of these HIV-1 envelope glycoprotein regions determines the efficiency of membrane fusion in a target cell-specific manner and support a model in which the gp41 amino terminus interacts directly or indirectly with the target cell during virus entry.
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Selected References
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