Journal
YEAST
Volume 27, Issue 6, Pages 317-325Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/yea.1755
Keywords
alkali-metal-cation transporters; Pma1 ATPase; fluorescence measurements; microplate reader
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Funding
- MSMT [LC531, AV0Z 50110509]
- GA AS CR
- MSM [0021620835]
- [KJB500110701]
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pHluorin is a pH-sensitive variant of green fluorescent protein for measuring intracellular pH (pH(in)) in living cells. We constructed a new pHluorin plasmid with the dominant selection marker KanMX. This plasmid allows pH measurements in cells without auxotrophic mutations and/or grown in chemically indefinite media. We observed differing values of pH(in) for three prototrophic wild-types. The new construct was also used to determine the pH(in) strains differing in the activity of the plasma membrane Pma1 H(+)-ATPase and the influence of glucose on pH(in). We describe in detail pHluorin measurements performed in a microplate reader, which require much less hands-on time and much lower cell culture volumes compared to standard cuvettes measurements. We also utilized pHluorin in a new method of measuring the buffering capacity of yeast cell cytosol in vivo, shown to be ca. 52 mM/pH for wild-type yeast and moderately decreased in mutants with affected potassium transport. Copyright (C) 2010 John Wiley & Sons, Ltd.
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