PMID: 36142Apr 4, 1979

Cation exchanges of yeast in the absence of magnesium

Biochimica Et Biophysica Acta
A Rodríguez-Navarro, E D Sancho


Environmental Mg2+ was found to influence the K+/Na+ exchange rate of metabolizing yeast. Addition of EDTA increased the exchange rate and Mg2+ reversed the effect of EDTA. Yeast starved in the absence of Mg2+ exchanged cellular K+ or Na+ for external H+ when maintained at acidic pH. The exchange rate depended on cellular pH and showed the same kinetics for both K+ and Na+. At acidic pH, the presence of external cations neither inhibited H+ absorption nor changed the cation/H+ 1 : 1 stoichiometry. At neutral pH, external cations inhibited H+ influx but did not change the cation efflux. The K+/Na+ exchange is discussed as electrically coupled and the K+/H+ and Na+/H+ exchanges as electroneutral antiports.


Mar 15, 1977·FEBS Letters·A Rodriguez-Navarro, J Asensio
Jan 1, 1972·The Journal of Membrane Biology·F M Harold, D Papineau

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