Quercetin 2,3-dioxygenase (2,3-QD) activates molecular dioxygen to catalyze the oxidative degration of polyphenolic flavonols.The copper active site of 2,3-
Acireductone dioxygenase (ARD) have two iso-enzyme Ni(Ⅱ)–ARD (ARD) and Fe(Ⅱ)–ARD (ARD′).Although the active site of the two ARD exhibit similar distort