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Phosphoglycerate Dehydrogenase, 2-hydroxyacid dehydrogenase family Phosphoglycerate Dehydrogenase (PGDH) catalyzes the NAD-dependent conversion of 3-phosphoglycerate into 3-phosphohydroxypyruvate, which is the first step in serine biosynthesis. Over-expression of PGDH has been implicated as supporting proliferation of certain breast cancers, while PGDH deficiency is linked to defects in mammalian central nervous system development. PGDH is a member of the 2-hydroxyacid dehydrogenase family, enzymes that catalyze the conversion of a wide variety of D-2-hydroxy acids to their corresponding keto acids. The general mechanism is (R)-lactate + acceptor to pyruvate + reduced acceptor. Formate/glycerate and related dehydrogenases of the D-specific 2-hydroxyacid dehydrogenase superfamily include groups such as formate dehydrogenase, glycerate dehydrogenase, L-alanine dehydrogenase, and S-Adenosylhomocysteine Hydrolase. Despite often low sequence identity, these proteins typically have a characteristic arrangement of 2 similar subdomains of the alpha/beta Rossmann-fold NAD+ binding form. The NAD+ binding domain is inserted within the linear sequence of the mostly N-terminal catalytic domain, which has a similar domain structure to the internal NAD binding domain. Structurally, these domains are connected by extended alpha helices and create a cleft in which NAD is bound, primarily to the C-terminal portion of the 2nd (internal) domain. Some related proteins have similar structural subdomain but with a tandem arrangement of the catalytic and NAD-binding subdomains in the linear sequence. While many members of this family are dimeric, alanine DH is hexameric and phosphoglycerate DH is tetrameric. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",