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. 1982 Feb;43(2):311–318. doi: 10.1128/aem.43.2.311-318.1982

Effects of Polyenes, Detergents, and Other Potential Membrane Perturbants on an Osmotolerant Yeast, Saccharomyces rouxii

Wilfred N Arnold 1, Brenda P Johnson 1
PMCID: PMC241824  PMID: 16345936

Abstract

The osmotolerance of Saccharomyces rouxii 48-28 was confirmed with both NaCl- and KCl-fortified growth media, with more tolerance being exhibited for the potassium salt. Washed and buffered cells from unfortified medium were challenged with a variety of compounds (and also with physical treatments) that potentially would elicit membrane perturbations. The efficacy of these brief treatments was judged primarily by monitoring subsequent viability. Change in the degree of expression of β-fructofuranosidase (EC 3.2.1.26), which is cryptic in young cells of S. rouxii, was a second criterion. There was a linear correlation between cell death and enzyme expression for treatments with polyenes, detergents, some organic solvents which did not denature the enzyme, and various freeze-thaw regimens in graded amounts of glycerol. The species is relatively insensitive to polyene antimycotics, the order of decreasing effect being filipin, nystatin, and amphotericin B. S. rouxii was found to be less sensitive to osmotic shock than is Saccharomyces cerevisiae, but in neither species is β-fructofuranosidase released to the medium. The sensitivity of S. rouxii to ionic detergents, but not to nonionic detergents, was rationalized as being due to cell wall discrimination against larger micelles for the nonionic examples. This was confirmed by showing that protoplasts were sensitive to both classes. In cultures older than 5 days the normal agreement between colony-forming units and methylene blue exclusion (another test of viability) no longer held. Delayed fermentation of sucrose by S. rouxii, which is a diagnostic feature of the species, is explained by death of some cells, expression of their β-fructofuranosidase, and utilization of the monosaccharides by the surviving cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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