IUBMB Enzyme Nomenclature


Accepted name: catechol 2,3-dioxygenase

Reaction: catechol + O2 = 2-hydroxymuconate-6-semialdehyde

For diagram of reaction click here.

Glossary: 2-hydroxymuconate-6-semialdehyde = (2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate

Other name(s): 2,3-pyrocatechase; catechol 2,3-oxygenase; catechol oxygenase; metapyrocatechase; pyrocatechol 2,3-dioxygenase; xylE (gene name)

Systematic name: catechol:oxygen 2,3-oxidoreductase (decyclizing)

Comments: Requires FeII. The enzyme initiates the meta-cleavage pathway of catechol degradation.

Links to other databases: BRENDA, EAWAG-BBD, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9029-46-3


1. Hayaishi, O. Direct oxygenation by O2, oxygenases. In: Boyer, P.D., Lardy, H. and Myrbäck, K. (Eds), The Enzymes, 2nd edn, vol. 8, Academic Press, New York, 1963, pp. 353-371.

2. Kojima, Y., Itada, N. and Hayaishi, O. Metapyrocatechase: a new catechol-cleaving enzyme. J. Biol. Chem. 236 (1961) 2223-2228. [PMID: 13757654]

3. Nozaki, M., Kagamiyama, H. and Hayaishi, O. Metapyrocatechase. I. Purification, crystallization and some properties. Biochem. Z. 338 (1963) 582-590. [PMID: 14087325]

4. Nakai, C., Hori, K., Kagamiyama, H., Nakazawa, T. and Nozaki, M. Purification, subunit structure, and partial amino acid sequence of metapyrocatechase. J. Biol. Chem. 258 (1983) 2916-2922. [PMID: 6826545]

5. Junker, F., Field, J.A., Bangerter, F., Ramsteiner, K., Kohler, H.-P., Joannou, C.L., Mason, J.R., Leisinger, T. and Cook, A.M. Oxygenation and spontaneous deamination of 2-aminobenzenesulphonic acid in Alcaligenes sp. strain O-1 with subsequent meta ring cleavage and spontaneous desulphonation to 2-hydroxymuconic acid. Biochem. J. 300 (1994) 429-436. [PMID: 8002948]

6. Junker, F., Leisinger, T. and Cook, A.M. 3-Sulphocatechol 2,3-dioxygenase and other dioxygenases (EC and EC 1.14.12.-) in the degradative pathways of 2-aminobenzenesulphonic, benzenesulphonic and 4-toluenesulphonic acids in Alcaligenes sp. strain O-1. Microbiology 140 (1994) 1713-1722. [PMID: 8075807]

[EC created 1965 as EC, transferred 1972 to EC, modified 1999, modified 2013]

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