Metabolic intermediates as potential regulators of glucose-6-phosphatase. |
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Authors: | B L Robbins J D Foster R C Nordlie |
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Institution: | Department of Biochemistry and Molecular Biology, University of North Dakota, School of Medicine, Grand Forks 58202. |
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Abstract: | Twenty-five metabolites of glucose, gluconeogenic substrates, and related compounds were examined as potential inhibitors of glucose-6-phosphatase (EC 3.1.3.9) catalytic unit and substrate transport function, using disrupted and intact rat liver microsomes. Inhibitions (competitive) were noted with six. Calculated per cent inhibitions with presumed near-physiologic concentrations of inhibitor and substrate were small. However, when hepatic fructose-1-P concentration is elevated in response to a fructose load, inhibition of glucose-6-phosphatase by fructose-1-P may play a regulatory role, along with fructose-1-P-associated deinhibition of glucokinase, by directing glucose-6-P away from glucose formation and towards glycogen synthesis and glycolysis. |
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