The Enzyme Database

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Accepted name: quercetin 2,3-dioxygenase
Reaction: quercetin + O2 = 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO + H+
For diagram of reaction, click here
Other name(s): quercetinase; flavonol 2,4-oxygenase; quercetin:oxygen 2,3-oxidoreductase (decyclizing)
Systematic name: quercetin:oxygen 2,3-oxidoreductase (ring-opening)
Comments: The enzyme from Aspergillus sp. is a copper protein whereas that from Bacillus subtilis contains iron. Quercetin is a flavonol (5,7,3′,4′-tetrahydroxyflavonol).
Links to other databases: BRENDA, EAWAG-BBD, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9075-67-6
1.  Oka, T. and Simpson, F.J. Quercetinase, a dioxygenase containing copper. Biochem. Biophys. Res. Commun. 43 (1971) 1–5. [DOI] [PMID: 5579942]
2.  Steiner, R.A., Kalk, K.H. and Dijkstra, B.W. Anaerobic enzyme·substrate structures provide insight into the reaction mechanism of the copper-dependent quercetin 2,3-dioxygenase. Proc. Natl. Acad. Sci. USA 99 (2002) 16625–16630. [DOI] [PMID: 12486225]
3.  Bowater, L., Fairhurst, S.A., Just, V.J. and Bornemann, S. Bacillus subtilis YxaG is a novel Fe-containing quercetin 2,3-dioxygenase. FEBS Lett. 557 (2004) 45–48. [DOI] [PMID: 14741339]
[EC created 1972]

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