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The known primate lentiviruses can be divided into two subgroups consisting of the human immunodeficiency virus type 1 (HIV-1) isolates and the related HIV type 2 (HIV-2) and simian immunodeficiency virus (SIV) isolates. HIV-1 has been shown to encode a post-transcriptional trans-activator of viral structural gene expression, termed Rev, that is essential for viral replication in culture. Here, we demonstrate that HIV-2 and SIVmac also encode functional Rev proteins. As in the case of HIV-1, these Rev trans-activators are shown to induce the cytoplasmic expression of the unspliced viral transcripts that encode the viral structural proteins. Unexpectedly, the Rev proteins of HIV-2 and SIVmac proved incapable of activating the cytoplasmic expression of unspliced HIV-1 transcripts, whereas HIV-1 Rev was fully functional in the HIV-2/SIV system. This nonreciprocal complementation may imply a direct role for Rev in mediating the recognition of its viral RNA target sequence.

Functional comparison of the Rev trans-activators encoded by different primate immunodeficiency virus species.