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. 1991 Aug;11(8):4235–4243. doi: 10.1128/mcb.11.8.4235

Cloning and characterization of a gene which determines osmotic stability in Saccharomyces cerevisiae.

L I Stateva 1, S G Oliver 1, L J Trueman 1, P V Venkov 1
PMCID: PMC361250  PMID: 2072917

Abstract

The srb1-1 mutation of Saccharomyces cerevisiae is an ochre allele which renders the yeast dependent on an osmotic stabilizer for growth and gives the cells the ability to lyse on transfer to hypotonic conditions. A DNA fragment which complements both of these phenotypic effects has been cloned. This clone contains a functional gene which is transcribed into a 2.3-kb polyadenylated mRNA molecule. Transformation of yeast strains carrying defined suppressible alleles demonstrated that the cloned fragment does not contain a nonsense suppressor. Integrative transformation and gene disruption experiments, when combined with classical genetic analysis, confirmed that the cloned fragment contained the wild-type SRB1 gene. The integrated marker was used to map SRB1 to chromosome XV by Southern hybridization and pulsed-field gel electrophoresis. A disruption mutant created by the insertion of a TRP1 marker into SRB1 displayed only the lysis ability phenotype and was not dependent on an osmotic stabilizer for growth. Lysis ability was acquired by growth in (or transfer to) an osmotically stabilized environment, but only under conditions which permitted budding. It is inferred that budding cells lyse with a higher probability and that weak points in the wall at the site of budding are involved in the process. The biotechnological potential of the cloned gene and the disruption mutant is discussed.

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Selected References

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