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- W1563529384 abstract "Oxamate, structural analog of pyruvate, inhibits gluconeogenesis from pyruvate or substrates yielding pyruvate. The inhibitory effect is the result of a decreased mitochondrial pyruvate utilization. Although the inhibition of gluconeogenesis is competitive for pyruvate, in isolated mitochondria oxamate displays a mixed type kinetics inhibitory pattern of pyruvate utilization. Evidence is presented indicating that this mixed type pattern of inhibition is the result of the action of oxamate on two different sites: noncompetitive inhibition of pyruvate carboxylation, and competitive inhibition of pyruvate entry into the mitochondria. At concentrations of pyruvate above 0.4 mM, although pyruvate carboxylation is decreased by 40% by oxamate, no detectable effects on the gluconeogenic flux were observed. This finding strongly indicates that pyruvate carboxylase is not an important rate-limiting step for hepatic gluconeogenesis. Thus, the inhibition of gluconeogenesis at low pyruvate concentrations (less than 0.4 mM) seems to be the result of an interaction of oxamate with the mitochondrial pyruvate translocator, indicating that pyruvate transport across the mitochondrial membrane is the first nonequilibrium step in the gluconeogenic pathway when low physiological concentrations of this substrate are utilized." @default.
- W1563529384 created "2016-06-24" @default.
- W1563529384 creator A5051076620 @default.
- W1563529384 creator A5073870170 @default.
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- W1563529384 date "1986-10-01" @default.
- W1563529384 modified "2023-10-12" @default.
- W1563529384 title "Rate-limiting steps for hepatic gluconeogenesis. Mechanism of oxamate inhibition of mitochondrial pyruvate metabolism." @default.
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- W1563529384 doi "https://doi.org/10.1016/s0021-9258(18)66968-6" @default.
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