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・ Quercus gambleana
・ Quercus garryana
・ Quercus geminata
・ Quercus gentryi
・ Quercus georgiana
・ Quercus germana
・ Queralt Casas
・ Queralt Castellet
・ Querandiornis
・ Querandí
・ Querary River
・ Querbach (Westerbach)
・ Quercamps
・ Quercetagetin
・ Quercetin
Quercetin 2,3-dioxygenase
・ Quercetin 3,4'-diglucoside
・ Quercetin 3-O-methyltransferase
・ Quercetin 3-O-sulfate
・ Quercetin glucuronide
・ Quercetin-3,3'-bissulfate 7-sulfotransferase
・ Quercetin-3-sulfate 3'-sulfotransferase
・ Quercetin-3-sulfate 4'-sulfotransferase
・ Querceto
・ Querceto (Montecatini Val di Cecina)
・ Quercia
・ Quercianella
・ Quercianella–Sonnino railway station
・ Quercinol
・ Quercitannic acid


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Quercetin 2,3-dioxygenase : ウィキペディア英語版
Quercetin 2,3-dioxygenase

In enzymology, a quercetin 2,3-dioxygenase () is an enzyme that catalyzes the chemical reaction
:quercetin + O2 \rightleftharpoons 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==

As of late 2007, 6 crystal structures have been solved for this class of enzymes, with PDB accession codes , , , , , and .

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