Changes in Glucose 6-Phosphate and Storage Carbohydrates during Catabolite Derepression in Saccharomyces cerevisiae

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Abstract
Changes in the cellular content of G-6-P and storage carbohydrates during catabolite derepression were measured during the diauxic growth of S. cerevisiae on glucose (1% wt/vol) medium. After the exhaustion of glucose there were transient increases in G-6-P, alkali-soluble glycogen and trehalose, reflecting enhanced gluconeogenesis, followed by an increase in acid-soluble glycogen. During the subsequent adaptation to growth on ethanol the amounts of G-6-P, trehalose and glycogen returned to basal levels. Thus storage carbohydrates, of which glycogen is quantitatively the most important, appear to act as the energy source for catabolite derepression.

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