Phosphoglycerate kinase is an enzyme of the glycolytic pathway which converts 3-phosphoglyceroyl phosphate into 3-phosphoglycerate.
For each molecule of 3-phosphoglyceroyl phosphate hydrolyzed, 1 molecule of ATP is produced from ADP; hence, for each glucose molecule substrate for glycolysis, 2 molecules of ATP are produced by this step.
The reverse reaction occurs in gluconeogenesis; it consumes 1 molecule of ATP per molecule of glucose formed.
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