Carbazole 1,9a-dioxygenase (EC 1.14.12.22, CARDO) is an enzyme with systematic name 9H-carbazole,NAD(P)H:oxygen oxidoreductase (2,3-hydroxylating).
[1][2] This enzyme catalyses the following chemical reaction Carbazole 1,9a-dioxygenase catalyses the first reaction in the pathway of carbazole degradation.