Role of vacuolar ion pool in Saccharomyces carlsbergensis: potassium efflux from vacuoles is coupled with manganese or magnesium influx.
Saccharomyces carlsbergensis cells accumulated Mn2+ (or Mg2+) ions in the presence of glucose, fructose, or mannose, but not of deoxyglucose, 3-O-methylglucose, and sorbose. Accumulation of one equivalent of Mn/2+ was coupled with the efflux of two equivalents of K+ from the cells. Mg/2+ did not exit during Mn2+ uptake. Preliminary treatment of cells with various proton conductors or glucose led to the loss of K+ and to the proportional inhibition of Mn2+ uptake. Polyene antibiotic candicidin together with glucose elicited rapid efflux of K+ and completely inhibited Mn2+ accumulation. Exogenous K+ (more than 1 mM), 100 microM N,N'-dicyclohexylcarbodiimide, and 30 mM sodium arsenate inhibited both K+ efflux and Mn2+ influx. K+ efflux from S. carlsbergensis cells affected the vacuolar pool of K+ both during the accumulation of Mn2+ or Mg2+ and during glucose uptake.
D002241:Carbohydrates / Q000494:pharmacology; D008274:Magnesium / Q000378:metabolism*; D008345:Manganese / Q000378:metabolism*; D009940:Organoids / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism* / Q000494:pharmacology; D012440:Saccharomyces / Q000378:metabolism* / Q000648:ultrastructure; D012964:Sodium / Q000494:pharmacology; D014617:Vacuoles / Q000378:metabolism*
D002241:Carbohydrates; D008345:Manganese; D012964:Sodium; D008274:Magnesium; D011188:Potassium