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D-3-Phosphoglycerate dehydrogenase (D-3-phosphoglycerate:NAD + 2-oxidoreductase, EC 1.1.1.95) catalyzes the first committed step in serine biosynthesis by utilizing NAD + in the conversion of phospho- giyceric acid to 3-phosphohydroxypyruvic acid

Escherichia coli D-3-phosphoglycerate dehydrogenase has been isolated in homogeneous form by a simple procedure employing 5'-AMP-Sepharose as an affinity adsorbent. The enzyme is composed of four identical po lypep t ide chains each with a molecular weight of a p p r o x i m a t e l y 40 000. A m i n o t e r m i n a l sequence analysis of the first 36 residues clearly establishes the re la t ionship of this enzyme to other NAD-dependent dehydrogenases.