Abstract
Murine CD4+ cells are resistant to human immunodeficiency virus type 1 (HIV-1) entry and to fusion with cells expressing HIV-1 envelope glycoproteins (Env). The role of human-specific factors in Env/CD4-mediated fusion is shown by the ability of transient cell hybrids formed between CD4+ murine cells and human HeLa cells to fuse with Env+ cells. Fusion events were observed when other human cells, including erythrocytes, were substituted for HeLa cells in the hybrids. Experiments with erythrocyte ghosts showed that the factors allowing Env/CD4-mediated fusion are located in the plasma membrane. These factors were fully active after extensive digestion of erythrocytes with proteinase K or pronase. Nonprotein components of human plasma membranes, possibly glycolipids, could therefore be required for Env/CD4-mediated fusion and virus entry.
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