IUBMB Enzyme Nomenclature


Accepted name: 4-nitrocatechol 4-monooxygenase

Reaction: 4-nitrocatechol + NAD(P)H + H+ + O2 = 2-hydroxy-1,4-benzoquinone + nitrite + NAD(P)+ + H2O

For diagram of reaction click here.

Systematic name: 4-nitrocatechol,NAD(P)H:oxygen 4-oxidoreductase (4-hydroxylating, nitrite-forming)

Comments: Contains FAD. The enzyme catalyses the oxidation of 4-nitrocatechol with the concomitant removal of the nitro group as nitrite. Forms a two-component system with a flavoprotein reductase [1]. The enzymes from the bacteria Lysinibacillus sphaericus JS905 and Rhodococcus sp. strain PN1 were shown to also catalyse EC, 4-nitrophenol 2-monooxygenase [1,2] while the enzyme from Pseudomonas sp. WBC-3 was shown to also catalyse EC, 4-nitrophenol 4-monooxygenase [3].

Links to other databases: BRENDA, EAWAG-BBD, EXPASY, KEGG, Metacyc, CAS registry number:


1. Kadiyala, V. and Spain, J.C. A two-component monooxygenase catalyzes both the hydroxylation of p-nitrophenol and the oxidative release of nitrite from 4-nitrocatechol in Bacillus sphaericus JS905. Appl. Environ. Microbiol. 64 (1998) 2479-2484. [PMID: 9647818]

2. Kitagawa, W., Kimura, N. and Kamagata, Y. A novel p-nitrophenol degradation gene cluster from a gram-positive bacterium, Rhodococcus opacus SAO101. J. Bacteriol. 186 (2004) 4894-4902. [PMID: 15262926]

3. Zhang, J.J., Liu, H., Xiao, Y., Zhang, X.E. and Zhou, N.Y. Identification and characterization of catabolic para-nitrophenol 4-monooxygenase and para-benzoquinone reductase from Pseudomonas sp. strain WBC-3. J. Bacteriol. 191 (2009) 2703-2710. [PMID: 19218392]

[EC created 2012]

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