Abstract
Experimental conditions have been elaborated to test for reversibility of the malate dehydrogenase inactivation (E.C.1.1.1.37) after addition of glucose to derepressed yeast cells. Malate dehydrogenase inactivation was shown to be irreversible at all stages of inactivation. In contrast fructose-1,6-bisphosphatase inactivation (E.C.3.1.11) remained reversible for at least 30 min after addition of glucose.
Rapid reversible inactivation of fructose-1,6-bisphosphatase and irreversible inactivation of malate dehydrogenase were additionally investigated in glycolytic block mutants. Normal inactivation kinetics were observed in mutants without catalytic activity of phosphoglucoseisomerase (E.C.5.3.1.9), phosphofructokinase (E.C.2.7.1.11), triosephosphate isomerase (E.C.5.3.1.1) and phosphoglycerate kinase (E.C.2.7.2.3). Hence, neither type of inactivation depended on the accumulation of any glucose metabolite beyond glucose-6-phosphate. Under anaerobic conditions irreversible inactivation was completely abolished in glycolytic block mutants. In contrast rapid reversible inactivation was independent of energy provided by respiration or fermentation.
Reversibility of fructose-1,6-bisphosphatase inactivation was tested under conditions which prevented irreversible malate dehydrogenase inactivation. In these experiments, fructose-1,6-bisphosphatase inactivation remained reversible for at least 120 min, whereas reversibility was normally restricted to about 30 min. This indicated a common mechanism between the irreversible part of fructose-1,6-bisphosphatase inactivation and irreversible malate dehydrogenase inactivation.
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Entian, KD., Dröll, L. & Mecke, D. Studies on rapid reversible and non-reversible inactivation of fructose-1,6-bisphosphatase and malate dehydrogenase in wild-type and glycolytic block mutants of Saccharomyces cerevisiae . Arch. Microbiol. 134, 187–192 (1983). https://doi.org/10.1007/BF00407756
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DOI: https://doi.org/10.1007/BF00407756