Abstract
Virus derived from an infectious molecular clone of the ELI strain of human immunodeficiency virus type 1 (HIV-1) replicates well in peripheral blood mononuclear cells and in some CD4-positive cell lines but exhibits a delayed time course of infection in CEM and H9 cells and fails to infect SupT1 and U937 cells. If the virus that emerges from infected H9 cells is used to infect CEM and H9 cells, the time course of infection is accelerated and the virus is able to infect U937 and SupT1 cells. In this study, we used the technique of polymerase chain reaction-single-strand conformation polymorphism to localize changes in both the extracellular gp120 and the transmembrane gp41 components of the envelope gene associated with adaptation to growth in tissue culture cell lines. Specifically, mutations were identified both in a region of gp120 implicated in CD4 binding and in the amino-terminal portion of gp41 adjacent to the region involved in fusion. No changes were found in the V3 loop of gp120, a region previously shown to be involved in viral tropism. When these mutations were introduced into the original molecular clone, they conferred an enhanced replicative capacity on ELI. These results demonstrate that two additional determinants in the HIV-1 envelope protein influence viral tropism and growth in vitro. They also may have important implications for the generation of viruses with increased growth potential and expanded host range seen in the late stages of HIV disease.
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