Reaction: an (R)-2-hydroxycarboxylate + NADP+ = a 2-oxocarboxylate + NADPH + H+
For diagram of reaction click here.
Other name(s): ddh (gene name)
Systematic name: (R)-2-hydroxycarboxylate:NADP+ oxidoreductase
Comments: This enzyme, characterized from the halophilic archaeon Haloferax mediterranei, catalyses a reversible stereospecific reduction of 2-ketocarboxylic acids into the corresponding D-2-hydroxycarboxylic acids. The enzyme prefers substrates with a main chain of 5 carbons (such as 4-methyl-2-oxopentanoate) to those with a shorter chain, and can use NADH with much lower efficiency. cf. EC 18.104.22.1685, (D)-2-hydroxyacid dehydrogenase (NAD+).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 81210-65-3
1. Domenech, J. and Ferrer, J. A new D-2-hydroxyacid dehydrogenase with dual coenzyme-specificity from Haloferax mediterranei, sequence analysis and heterologous overexpression. Biochim. Biophys. Acta 1760 (2006) 1667-1674. [PMID: 17049749]