Reaction: a (2S)-2-hydroxycarboxylate + NAD(P)+ = a 2-oxocarboxylate + NAD(P)H + H+
Other name(s): MdhII; lactate/malate dehydrogenase
Systematic name: (2S)-2-hydroxycarboxylate:NAD(P)+ oxidoreductase
Comments: The enzyme from the archaeon Methanocaldococcus jannaschii catalyses the reversible oxidation of (2R)-3-sulfolactate and (S)-malate to 3-sulfopyruvate and oxaloacetate, respectively (note that (2R)-3-sulfolactate has the same stereochemical configuration as (2S)-2-hydroxycarboxylates) . The enzyme can use both NADH and NADPH, although activity is higher with NADPH [1-3]. The oxidation of (2R)-3-sulfolactate was observed only in the presence of NADP+ . The same organism also possesses an NAD+-specific enzyme with similar activity, cf. >EC 126.96.36.1997, L-2-hydroxycarboxylate dehydrogenase (NAD+).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Graupner, M., Xu, H. and White, R.H. Identification of an archaeal 2-hydroxy acid dehydrogenase catalyzing reactions involved in coenzyme biosynthesis in methanoarchaea. J. Bacteriol. 182 (2000) 3688-3692. [PMID: 10850983]
2. Lee, B.I., Chang, C., Cho, S.J., Eom, S.H., Kim, K.K., Yu, Y.G. and Suh, S.W. Crystal structure of the MJ0490 gene product of the hyperthermophilic archaebacterium Methanococcus jannaschii, a novel member of the lactate/malate family of dehydrogenases. J. Mol. Biol. 307 (2001) 1351-1362. [PMID: 11292347]
3. Madern, D. The putative L-lactate dehydrogenase from Methanococcus jannaschii is an NADPH-dependent L-malate dehydrogenase. Mol. Microbiol. 37 (2000) 1515-1520. [PMID: 10998181]