IUBMB Enzyme Nomenclature


Accepted name: 2,4-dinitrotoluene dioxygenase

Reaction: 2,4-dinitrotoluene + NADH + O2 = 4-methyl-5-nitrocatechol + nitrite + NAD+

Other name(s): dntA (gene name)

Systematic name: 2,4-dinitrotoluene,NADH:oxygen oxidoreductase (4,5-hydroxylating, nitrite-releasing)

Comments: This enzyme, characterized from the bacterium Burkholderia sp. strain DNT, is a member of the naphthalene family of bacterial Rieske non-heme iron dioxygenases. It comprises a multicomponent system, containing a Rieske [2Fe-2S] ferredoxin, an NADH-dependent flavoprotein reductase (EC, ferredoxin—NAD+ reductase), and an α3β3 oxygenase. The enzyme forms a cis-dihydroxylated product that spontaneously rearranges to form a catechol with accompanying release of nitrite. It does not act on nitrobenzene. cf. EC, nitroarene dioxygenase.

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


1. Suen, W.C., Haigler, B.E. and Spain, J.C. 2,4-Dinitrotoluene dioxygenase from Burkholderia sp. strain DNT: similarity to naphthalene dioxygenase. J. Bacteriol. 178 (1996) 4926-4934. [PMID: 8759857]

[EC created 2015]

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