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J Virol. 1991 May; 65(5): 2452-2456

Effects of chimeric mutants of human immunodeficiency virus type 1 Rev and human T-cell leukemia virus type I Rex on nucleolar targeting signals.

Institute for Virus Research, Kyoto University, Japan.

ABSTRACT

Two chimeric mutant genes derived from rev of human immunodeficiency virus type 1 and rex of human T-cell leukemia virus type I were constructed to investigate the functions of the nucleolar-targeting signals (NOS) in Rev and Rex proteins. A chimeric Rex protein whose NOS region was substituted with the NOS of Rev was located predominantly in the cell nucleolus and functioned like the wild-type protein in the Rex assay system. However, a chimeric Rev with the NOS of Rex abolished Rev function despite its nucleolar localization. This nonfunctional nucleolar-targeting chimeric protein inhibited the function of both Rex and Rev. In the same experimental conditions, this mutant interfered with the localization of the functional Rex in the nucleolus.

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