Quercetin 2,3-dioxygenase

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quercetin 2,3-dioxygenase
1H1i quercetine2-3-dioxygenase.png
Crystal structure of quercetin 2,3-dioxygenase from pdb entry 1H1I with quercetin and copper.
EC number
CAS number 9075-67-6
IntEnz IntEnz view
ExPASy NiceZyme view
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / QuickGO

In enzymology, a quercetin 2,3-dioxygenase (EC is an enzyme that catalyzes the chemical reaction

quercetin + O2 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO + H+

Thus, the two substrates of this enzyme are quercetin and O2, whereas its 3 products are 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate, CO, and H+.

This enzyme belongs to the family of oxidoreductases, specifically those acting on single donors with O2 as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases). The oxygen incorporated need not be derived from O2. The systematic name of this enzyme class is quercetin:oxygen 2,3-oxidoreductase (decyclizing). Other names in common use include quercetinase, and flavonol 2,4-oxygenase. It has 2 cofactors: iron, and Copper.

Structural studies[edit]

As of late 2007, 6 crystal structures have been solved for this class of enzymes, with PDB accession codes 1GQG, 1GQH, 1H1I, 1H1M, 1JUH, and 2H0V.