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. 1985 Apr;5(4):816–822. doi: 10.1128/mcb.5.4.816

Isolation of the SUP45 omnipotent suppressor gene of Saccharomyces cerevisiae and characterization of its gene product.

H J Himmelfarb, E Maicas, J D Friesen
PMCID: PMC366786  PMID: 3887137

Abstract

The Saccharomyces cerevisiae SUP45+ gene has been isolated from a genomic clone library by genetic complementation of paromomycin sensitivity, which is a property of a mutant strain carrying the sup45-2 allele. This plasmid complements all phenotypes associated with the sup45-2 mutation, including nonsense suppression, temperature sensitivity, osmotic sensitivity, and paromomycin sensitivity. Genetic mapping with a URA3+-marked derivative of the complementing plasmid that was integrated into the chromosome by homologous recombination demonstrated that the complementing fragment contained the SUP45+ gene and not an unlinked suppressor. The SUP45+ gene is present as a single copy in the haploid genome and is essential for viability. In vitro translation of the hybrid-selected SUP45+ transcript yielded a protein of Mr = 54,000, which is larger than any known ribosomal protein. RNA blot hybridization analysis showed that the steady-state level of the SUP45+ transcript is less than 10% of that for ribosomal protein L3 or rp59 transcripts. When yeast cells are subjected to a mild heat shock, the synthesis rate of the SUP45+ transcript was transiently reduced, approximately in parallel with ribosomal protein transcripts. Our data suggest that the SUP45+ gene does not encode a ribosomal protein. We speculate that it codes for a translation-related function whose precise nature is not yet known.

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