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(PGA) The phosphorylated derivative of the three-carbon glyceric acid. It may be phosphorylated at the second or third carbon giving 2-phosphoglyceric acid or 3-phosphoglyceric acid respectively. 3-phosphoglycerate is the first product of the dark reactions of photosynthesis, two molecules being formed by the carboxylation and cleavage of ribulose bisphosphate. It is also an intermediate in glycolysis being formed from 3-phosphoglyceroyl phosphate, two molecules of ATP being formed in the process. It is then converted, via 2-phosphoglycerate, to phosphoenolpyruvate. 3-phosphoglycerate is the precursor of the amino acid serine.
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