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. 1994 Nov;176(22):7126–7128. doi: 10.1128/jb.176.22.7126-7128.1994

SPE1 and SPE2: two essential genes in the biosynthesis of polyamines that modulate +1 ribosomal frameshifting in Saccharomyces cerevisiae.

D Balasundaram 1, J D Dinman 1, C W Tabor 1, H Tabor 1
PMCID: PMC197094  PMID: 7961484

Abstract

We previously showed that a mutant of Saccharomyces cerevisiae, which cannot make spermidine as a result of a deletion in the SPE2 gene (spe2 delta), exhibits a marked elevation in +1 ribosomal frameshifting efficiency in response to the Ty1 frameshift sequence, CUU AGG C. In the present study, we found that spermidine deprivation alone does not result in increased +1 ribosomal frameshifting efficiency. The high level of +1 ribosomal frameshifting efficiency in spe2 delta cells is the result of the combined effects of both spermidine deprivation and the large increase in the level of intracellular putrescine resulting from the derepression of the gene for ornithine decarboxylase (SPE1) in spermidine-deficient strains.

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Selected References

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