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J Bacteriol. 1975 March; 121(3): 975-982

Adenylate energy charge in Saccharomyces cerevisiae during starvation.

ABSTRACT

Bakers' yeast cells, Saccharomyces cerevisiae, if grown aerobically on ethanol or if grown aerobically on glucose and allowed to pass into stationary phase, with utilization of accumulated ethanol, maintain a normal value (0.8 to 0.9) of the adenylate energy charge during prolonged starvation. In contrast, cells grown anaerobically on glucose and cells in the early stages of aerobic growth on glucose exhibit a rapid decrease of energy charge if transferred to medium lacking on energy source. These results suggest that functional mitochondria or enzymes of balance of adenine nucleotides during starvation. Yeast cells remain viable at energy charge values below 0.1, in marked contrast to results previously obtained with Escherichia coli. In other respects, the engery charge responses of yeast to starvation and refeeding are generally similar to those previously reported for E. coli.

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