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J Biol Chem, Vol. 273, Issue 15, 9306-9311, April 10, 1998

The Gag Domain of the Gag-Pol Fusion Protein Directs Incorporation into the L-A Double-stranded RNA Viral Particles in Saccharomyces cerevisiae

From the Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892-0830

The L-A double-stranded RNA virus of yeast encodes its major coat protein, Gag, and a Gag-Pol fusion protein made by a 1 ribosomal frameshift, a coding strategy used by many retroviruses. We find that cells expressing only Gag from one plasmid and only Gag-Pol (in frame) from a separate plasmid can support the propagation of M₁ double-stranded RNA, encoding the killer toxin. We use this system to separately investigate the functions of Gag and the Gag part of Gag-Pol. L-A contains two fusion protein molecules per particle, and although N-terminal acetylation of Gag is essential for viral assembly, it is completely dispensable for function of Gag-Pol. In general, the requirements on Gag for viral assembly and propagation are more stringent than on the Gag part of Gag-Pol. Finally, we directly show that it is Gag that instructs the incorporation of Gag-Pol into the viral particles.

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