Reaction: 4-phospho-D-erythronate + NAD+ = (3R)-3-hydroxy-2-oxo-4-phosphooxybutanoate + NADH + H+
For diagram of reaction click here.
Other name(s): PdxB; PdxB 4PE dehydrogenase; 4-O-phosphoerythronate dehydrogenase
Systematic name: 4-phospho-D-erythronate:NAD+ 2-oxidoreductase
Comments: This enzyme catalyses a step in a bacterial pathway for the biosynthesis of pyridoxal 5'-phosphate. The enzyme contains a tightly-bound NAD(H) cofactor that is not re-oxidized by free NAD+. In order to re-oxidize the cofactor and restore enzyme activity, the enzyme catalyses the reduction of a 2-oxo acid (such as 2-oxoglutarate, oxaloacetate, or pyruvate) to the respective (R)-hydroxy acid [6]. cf. EC 1.1.1.399, 2-oxoglutarate reductase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 125858-75-5
References:
1. Lam, H.M. and Winkler, M.E. Metabolic relationships between pyridoxine (vitamin B6) and serine biosynthesis in Escherichia coli K-12. J. Bacteriol. 172 (1990) 6518-6528. [PMID: 2121717]
2. Pease, A.J., Roa, B.R., Luo, W. and Winkler, M.E. Positive growth rate-dependent regulation of the pdxA, ksgA, and pdxB genes of Escherichia coli K-12. J. Bacteriol. 184 (2002) 1359-1369. [PMID: 11844765]
3. Zhao, G. and Winkler, M.E. A novel α-ketoglutarate reductase activity of the serA-encoded 3-phosphoglycerate dehydrogenase of Escherichia coli K-12 and its possible implications for human 2-hydroxyglutaric aciduria. J. Bacteriol. 178 (1996) 232-239. [PMID: 8550422]
4. Grant, G.A. A new family of 2-hydroxyacid dehydrogenases. Biochem. Biophys. Res. Commun. 165 (1989) 1371-1374. [PMID: 2692566]
5. Schoenlein, P.V., Roa, B.B. and Winkler, M.E. Divergent transcription of pdxB and homology between the pdxB and serA gene products in Escherichia coli K-12. J. Bacteriol. 171 (1989) 6084-6092. [PMID: 2681152]
6. Rudolph, J., Kim, J. and Copley, S.D. Multiple turnovers of the nicotino-enzyme PdxB require α-keto acids as cosubstrates. Biochemistry 49 (2010) 9249-9255. [PMID: 20831184]