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Thevif gene of human immunodeficiency virus type 1 (HIV-1) encodes a basicM r 23,000 protein that is necessary for production of infectious virions by nonpermissive cells (human lymphocytes and macrophages) but not by permissive cells such as HeLa-CD4. It had been proposed that permissive cells may contain an unidentified factor that functions like the viral Vif protein. To test this hypothesis, we produced pseudotyped wild-type andvif -deleted HIVgpt virions (which contain the HIV-1 genome with the bacterial mycophenolic acid resistance genegpt in place of the viralenv gene) in permissive cells, and we used them to generate nonpermissive H9 leukemic T cells that express these proviruses. We then fused these H9 cells with permissive HeLa cells that express the HIV-1 envelope glycoprotein gp120-gp41, and we asked whether the heterokaryons would release infectious HIVgpt virions. The results clearly showed that thevif -deleted virions released by the heterokaryons were noninfectious whereas the wild-type virions were highly infectious. This strongly suggests that nonpermissive cells, the natural targets of HIV-1, contain a potent endogenous inhibitor of HIV-1 replication that is overcome by Vif.

An Endogenous Inhibitor of Human Immunodeficiency Virus in Human Lymphocytes Is Overcome by the Viral Vif Protein