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Sensitivity of fructose-1,6-bisphosphatase to glucose and cyclic AMP in the fission yeast Schizosaccharomyces pombe.

Stationary phase cells from resting cultures of Schizosaccharomyces pombe, suspended in buffer, did not decrease fructose-1,6-bisphosphatase (FbPase) activity upon addition of glucose to the cell suspension. In contrast, the addition of glucose to cells from derepressed growing cultures resulted in a 4- to 5-fold reduction in FbPase activity within minutes after the addition of the sugar. This response was independent of protein synthesis, was accompanied by a rise in the cyclic AMP (cAMP) level and was concomitant with an increase in the activity of neutral trehalase. The addition of exogenous cAMP to these cells provoked a decrease in FbPase similar to that induced by glucose. The occurrence of a glucose-induced cAMP signal was not sufficient to trigger the decrease in FbPase activity, which appeared to require additional transduction elements not active in growth-arrested cells. In assays performed in vitro it was found that the enzyme activity was strongly inhibited by fructose-2,6-bisphosphate.