Reaction: (1) (R)-3-(phenyl)lactate + NAD+ = 3-phenyl-2-oxopropanoate + NADH + H+
(2) (R)-3-(4-hydroxyphenyl)lactate + NAD+ = 3-(4-hydroxyphenyl)pyruvate + NADH + H+
(3) (R)-(indol-3-yl)lactate + NAD+ = (indol-3-yl)pyruvate + NADH + H+
Glossary: aromatic 2-oxoacid reductase
Other name(s): (R)-aromatic lactate dehydrogenase; (R)-4-hydroxyphenyllactate dehydrogenase; indolelactate:NAD+ oxidoreductase; indolelactate dehydrogenase; fldH (gene name); (indol-3-yl)lactate:NAD+ oxidoreductase
Systematic name: aromatic 2-oxoacid:NAD+ oxidoreductase
Comments: The enzymes from anaerobic bacteria such as Clostridium sporogenes participate in the fermentation pathways of L-phenylalanine, L-tyrosine and L-tryptophan. The enzyme from the yeast Candida maltosa has similar activity, but, unlike the bacterial enzyme, requires Mn2+ and can also use NADPH with lower activity.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, CAS registry number: 37250-41-2
References:
1. Jean, M. and DeMoss, R.D. Indolelactate dehydrogenase from Clostridium sporogenes. Can. J. Microbiol. 14 (1968) 429-435. [PMID: 4384683]
2. Giesel, H. and Simon, H. On the occurrence of enoate reductase and 2-oxo-carboxylate reductase in clostridia and some observations on the amino acid fermentation by Peptostreptococcus anaerobius. Arch. Microbiol. 135 (1983) 51-57. [PMID: 6354130]
3. Bode, R., Lippoldt, A. and Birnbaum, D. Purification and properties of D-aromatic lactate dehydrogenase an enzyme involved in the catabolism of the aromatic amino acids of Candida maltosa. Biochem. Physiol. Pflanzen 181 (1986) 189-198.
4. Dickert, S., Pierik, A.J., Linder, D. and Buckel, W. The involvement of coenzyme A esters in the dehydration of (R)-phenyllactate to (E)-cinnamate by Clostridium sporogenes. Eur. J. Biochem. 267 (2000) 3874-3884. [PMID: 10849007]
5. Dodd, D., Spitzer, M.H., Van Treuren, W., Merrill, B.D., Hryckowian, A.J., Higginbottom, S.K., Le, A., Cowan, T.M., Nolan, G.P., Fischbach, M.A. and Sonnenburg, J.L. A gut bacterial pathway metabolizes aromatic amino acids into nine circulating metabolites. Nature 551 (2017) 648-652. [PMID: 29168502]