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Proceedings of the National Academy of Sciences, Vol 91, 172-176, Copyright © 1994 by National Academy of Sciences

ARTICLE

Spermidine Deficiency Increases +1 Ribosomal Frameshifting Efficiency and Inhibits Ty1 Retrotransposition in Saccharomyces cerevisiae

D Balasundaram, JD Dinman, RB Wickner, CW Tabor and H Tabor

Polyamines have been implicated in nucleic acid-related functions and in protein biosynthesis. RNA sequences that specifically direct ribosomes to shift reading frame in the -1 and +1 directions may be used to probe the mechanisms controlling translational fidelity. We examined the effects of spermidine on translational fidelity by an in vivo assay in which changes in ß-galactosidase activity are dependent on yeast retrovirus Ty +1 and yeast double-stranded RNA virus L-A -1 ribosomal frameshifting signals. In spe2 mutants of Saccharomyces cerevisiae, which cannot make spermidine as a result of a deletion in the SPE2 gene, there is a marked elevation in +1 but no change in -1 ribosomal frameshifting. The increase in +1 ribosomal frameshifting efficiency is accompanied by a striking decrease in Ty1 retrotransposition.
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