ID 1.14.13.62 DE 4-hydroxyquinoline 3-monooxygenase. AN 1-H-4-oxoquinoline 3-monooxygenase. AN quinolin-4(1H)-one 3-monooxygenase. CA quinolin-4-ol + NADH + O2 + H(+) = quinoline-3,4-diol + NAD(+) + H2O. CC -!- quinolin-4-ol exists largely as the quinolin-4(1H)-one tautomer. //