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. 1980 Nov;144(2):661-5.
doi: 10.1128/jb.144.2.661-665.1980.

Vacuoles: main compartments of potassium, magnesium, and phosphate ions in Saccharomyces carlsbergenis cells

L A Okorokov, L P Lichko, I S Kulaev

Vacuoles: main compartments of potassium, magnesium, and phosphate ions in Saccharomyces carlsbergenis cells

L A Okorokov et al. J Bacteriol. 1980 Nov.

Abstract

The uneven distribution of Mg2+, K+, and phosphate in Saccharomyces carlsbergensis was demonstrated by the differential extraction of ions. Their concentrations were 5, 60, and 1 mM in the cytoplasm and 73, 470, and 110 mM in vacuoles, respectively. The intracellular gradients of these ions were 1:15, 1:8, and 1:110, respectively, across the tonoplast. The determination of free Mg2+ (1.35 mM in the cytosol and 20 mM in vacuoles) showed that the ion accumulation in vacuoles could not be explained by the higher degree of ion complexing in these organelles.

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