Reaction: quinaldate + acceptor + H2O = kynurenate + reduced acceptor
Other name(s): quinaldic acid 4-oxidoreductase
Systematic name: quinoline-2-carboxylate:acceptor 4-oxidoreductase (hydroxylating)
Comments: the enzyme from Pseudomonas sp. AK2 also acts on quinoline-8-carboxylate, whereas that from Serratia marcescens 2CC-1 will oxidize nicotinate; quinaldate is a substrate for both of these enzymes. 2,4,6-Trinitrobenzene sulfonate, 1,4-benzoquinone, 1,2-naphthoquinone, nitroblue tetrazolium, thionine and menadione will serve as an electron acceptor for the former enzyme and ferricyanide for the latter; Meldola blue, iodonitrotetrazolium chloride, phenazine methosulfate, 2,6-dichlorophenolindophenol and cytochrome c will act as electron acceptors for both.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 149885-77-8
References:
1. Sauter, M., Tshisuaka, B., Fetzner, S. and Lingens, F. Microbial metabolism of quinoline and related compounds. XX. Quinaldic acid 4-oxidoreductase from Pseudomonas sp. AK-2 compared to other procaryotic molybdenum-containing hydroxylases. Biol. Chem. Hoppe Seyler 374 (1993) 1037-1046. [PMID: 8292263]
2. Fetzner, S. and Lingens, F. Microbial metabolism of quinoline and related compounds. XVIII. Purification and some properties of the molybdenum- and iron-containing quinaldic acid 4-oxidoreductase from Serratia marcescens 2CC-1. Biol. Chem. Hoppe-Seyler 374 (1993) 363-376. [PMID: 8357532]