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- W1560052438 abstract "The concentration of 3-phosphoglyceroyl phosphate in erythrocytes was increased by more than 100-fold when red cells were incubated with extracellular phosphoenolpyruvate at 37 degrees C. Since these elevated levels were maintained for 60 min, the metabolism of 3-phosphoglyceroyl phosphate and related compounds could be investigated in phosphoenolpyruvate-treated erythrocytes. 2,3-Bisphosphoglycerate synthesis was not affected by intracellular pH when the 3-phosphoglyceroyl phosphate level was constant but did vary with 3-phosphoglyceroyl phosphate concentration. On the other hand, the relationship between the rate of 2,3-bisphosphoglycerate synthesis and 3-phosphoglyceroyl phosphate concentration was not straightforward. At relatively low concentrations of 3-phosphoglyceroyl phosphate, the observed rate of 2,3-bisphosphoglycerate synthesis agreed with a rate calculated from a formula incorporating kinetic parameters of purified 2,3-bisphosphoglycerate synthase (Rose, Z.B. (1973) Arch. Biochem. Biophys. 158, 903-910). However, at high concentrations of 3-phosphoglyceroyl phosphate, the observed rate of 2,3-bisphosphoglycerate synthesis was lower than the calculated value. The concentration of glucose 1,6-bisphosphate did not increase even when 3-phosphoglyceroyl phosphate was elevated to 200 microM. Elevated levels of intracellular 2,3-bisphosphoglycerate did not inhibit glycolytic activity in these erythrocytes. These results suggest that incubation of erythrocytes with phosphoenolpyruvate is a useful technique to investigate the effect of metabolic perturbations at the intermediate stages of glycolysis." @default.
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- W1560052438 date "1987-06-01" @default.
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- W1560052438 title "Metabolism of 3-phosphoglyceroyl phosphate in phosphoenolpyruvate-enriched human erythrocytes." @default.
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- W1560052438 doi "https://doi.org/10.1016/s0021-9258(18)47613-2" @default.
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