Abstract
Phosphoenolpyruvate carboxykinase showed high activity in Saccharomyces cerevisiae grown on gluconeogenic carbon sources. Addition of glucose to such cultures caused a rapid loss of the phosphoenolpyruvate carboxykinase activity. Fructose or mannose had the same effect as glucose, while 2-deoxyglucose or galactose were without effect. The inactivation was an irreversible process, since the regain of the activity was dependent of de novo protein synthesis. Cycloheximide did not prevent inactivation. All strains of the genus Saccharomyces tested showed inactivation of their phosphoenolpyruvate carboxykinase upon addition of glucose; this behaviour was not restricted to this genus.
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Abbreviations
- FbPase:
-
fructose bisphosphatase [EC 3.1.3.11 fructose-1,6-bisphosphate hydrolase]
- PEPCK:
-
phosphoenolpyruvate carboxykinase [EC 4.1.49 ATP: oxalacetate carboxylase (transphosphorylating)]
- YPE:
-
yeast-peptone-ethanol
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Gancedo, C., Schwerzmann, K. Inactivation by glucose of phosphoenolpyruvate carboxykinase from Saccharomyces cerevisiae . Arch. Microbiol. 109, 221–225 (1976). https://doi.org/10.1007/BF00446632
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DOI: https://doi.org/10.1007/BF00446632