IUBMB Enzyme Nomenclature


Accepted name: 4-hydroxy-tetrahydrodipicolinate reductase

Reaction: (S)-2,3,4,5-tetrahydropyridine-2,6-dicarboxylate + NAD(P)+ + H2O = (2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate + NAD(P)H + H+

For diagram of reaction click here

Glossary: (2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate = (2S,4S)-4-hydroxy-2,3,4,5-tetrahydropyridine-2,6-dicarboxylate
(S)-2,3,4,5-tetrahydropyridine-2,6-dicarboxylate = (2S)-2,3,4,5-tetrahydrodipicolinate

Other name(s): dihydrodipicolinate reductase (incorrect); dihydrodipicolinic acid reductase (incorrect); 2,3,4,5-tetrahydrodipicolinate:NAD(P)+ oxidoreductase (incorrect); dapB (gene name)

Systematic name: (S)-2,3,4,5-tetrahydropyridine-2,6-dicarboxylate:NAD(P)+ 4-oxidoreductase

Comments: The substrate of the enzyme was initially thought to be (S)-2,3-dihydrodipicolinate [1], and the enzyme was classified accordingly as EC, dihydrodipicolinate reductase. Later studies of the enzyme from the bacterium Escherichia coli have suggested that the actual substrate of the enzyme is (2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate, and that its activity includes a dehydration step [2], and thus the enzyme has been reclassified as 4-hydroxy-tetrahydrodipicolinate reductase. However, the identity of the substrate is still controversial, as more recently it has been suggested that it may be (S)-2,3-dihydrodipicolinate after all [3].

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Farkas, W. and Gilvarg, C. The reduction step in diaminopimelic acid biosynthesis. J. Biol. Chem. 240 (1965) 4717-4722. [PMID: 4378965]

2. Devenish, S.R., Blunt, J.W. and Gerrard, J.A. NMR studies uncover alternate substrates for dihydrodipicolinate synthase and suggest that dihydrodipicolinate reductase is also a dehydratase. J. Med. Chem. 53 (2010) 4808-4812. [PMID: 20503968]

3. Karsten, W.E., Nimmo, S.A., Liu, J. and Chooback, L. Identification of 2,3-dihydrodipicolinate as the product of the dihydrodipicolinate synthase reaction from Escherichia coli. Arch. Biochem. Biophys. 653 (2018) 50-62. [PMID: 29944868]

[EC created 1976 as EC, transferred 2013 to EC, modified 2020]

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