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Interaction of the human immunodeficiency virus type 1 (HIV-1) Rev protein with a structured region within env mRNA (termed RRE) mediates the export of virus structural mRNAs from the nucleus to the cytoplasm. We show that the region encompassing the basic stretch of amino acids is essential for the ability of Rev to bind to RRE RNA and function in vivo. By use of a functional truncated Rev protein in conjunction with authentic Rev, effects on gel mobilities of the Rev-RRE RNA complex attributable to multimerization of Rev protein were observed. Rev proteins, unable to multimerize, failed to bind RRE RNA. Identification of Rev mutants capable of forming multimers, but unable to bind RRE RNA, suggests that the multimerization and RNA-binding domains can be distinguished and that multimerization is likely a prerequisite for formation of the RRE RNA-binding site. A mutant Rev protein, shown previously to function as a trans-dominant inhibitor of Rev function, bound to RRE RNA as a multimer to a similar extent as wild-type Rev. This observation is consistent with the hypothesis that regulation of HIV gene expression by Rev involves the interaction with cellular factors and that the trans-dominant Rev is probably defective in this function.

genes and development

Interaction of the human immunodeficiency virus type 1 Rev protein with a structured region in env mRNA is dependent on multimer formation mediated through a basic stretch of amino acids.