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Evolutionary specialization of recoding: frameshifting in the expression of S. cerevisiae antizyme mRNA is via an atypical antizyme shift site but is still +1

Evolutionary specialization of recoding: frameshifting in the expression of S. cerevisiae antizyme mRNA is via an atypical antizyme shift site but is still +1

Rna 12(3): 332-337

An autoregulatory translational shift to the +1 frame is required for the expression of ornithine decarboxylase antizyme from fungi to mammals. In most eukaryotes, including all vertebrates and a majority of the studied fungi/yeast, the site on antizyme mRNA where the shift occurs is UCC-UGA. The mechanism of the frameshift on this sequence likely involves nearly universal aspects of the eukaryotic translational machinery. Nevertheless, a mammalian antizyme frameshift cassette yields predominantly -2 frameshift in Saccharomyces cerevisiae, instead of the +1 in mammals. The recently identified endogenous S. cerevisiae antizyme mRNA has an atypical shift site: UGC-GCG-UGA. It is shown here that endogenous S. cerevisiae antizyme frameshifting is +1 rather than -2. We discuss how antizyme frameshifting in budding yeasts exploits peculiarities of their tRNA balance, and relate this to prior studies on Ty frameshifting.

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Accession: 049008816

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PMID: 16431984

DOI: 10.1261/rna.2245906

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