Journal
FUNGAL BIOLOGY
Volume 114, Issue 2-3, Pages 144-150Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2009.11.002
Keywords
Alkali-metal cation tolerance; Hygromycin B sensitivity; Membrane potential; Saccharomyces cerevisiae
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Funding
- Czech Ministry of Education [LC531]
- Grant Agency of the CR [204/08/0354]
- Institutional Concept [AV0Z50110509]
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Saccharomyces cerevisiae yeast cells serve as a model to elucidate the bases of salt tolerance and potassium homeostasis regulation in eukaryotic cells. In this study, we show that two widely used laboratory strains, BY4741 and W303-1A, differ not only in cell size and volume but also in their relative plasma-membrane potential (estimated with a potentiometric fluorescent dye diS-C-3(3) and as Hygromycin B sensitivity) and tolerance to alkali-metal cations. W303-1A cells and their mutant derivatives lacking either uptake (trk1 trk2) or efflux (nha1) systems for alkali-metal cations are more tolerant to toxic sodium and lithium cations but also more sensitive to higher external concentrations of potassium than BY4741 cells and their mutants. Moreover, our results suggest that though the two strains do not differ in the total potassium content, the regulation of intracellular potassium homeostasis is probably not the same in BY4741 and W303-1A cells. (C) 2009 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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