This family consists of bacterial and archaeal Malate/L-lactate dehydrogenase. L-lactate dehydrogenase, EC:1.1.1.27, catalyses the reaction (S)-lactate + NAD(+) <=> pyruvate + NADH. Malate dehydrogenase, EC:1.1.1.37 and EC:1.1.1.82, catalyses the reactions: (S)-malate + NAD(+) <=> oxaloacetate + NADH, and (S)-malate + NADP(+) <=> oxaloacetate + NADPH respectively.

1: The Alcaligenes eutrophus ldh structural gene encodes a novel type of lactate dehydrogenase. Jendrossek D, Kratzin HD, Steinbuchel A; FEMS Microbiol Lett 1993;112:229-235. PMID:8405966

2: Properties and primary structure of the L-malate dehydrogenase from the extremely thermophilic archaebacterium Methanothermus fervidus. Honka E, Fabry S, Niermann T, Palm P, Hensel R; Eur J Biochem 1990;188:623-632. PMID:2110059