ID 1.14.14.141 DE psoralen synthase. CA (7S)-marmesin + O2 + reduced [NADPH--hemoprotein reductase] = acetone + CA H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] + psoralen. CC -!- This microsomal cytochrome P450 (heme-thiolate) enzyme is rather CC specific for (+)-marmesin, although it can also accept CC 5-hydroxymarmesin to a much lesser extent. CC -!- Furanocoumarins protect plants from fungal invasion and herbivore CC attack. CC -!- (+)-columbianetin, the angular furanocoumarin analog of the linear CC furanocoumarin (+)-marmesin, acts as a competitive inhibitor even CC though it is not a substrate. CC -!- Formerly EC 1.14.13.102. DR Q6QNI4, C71AJ_AMMMJ; C0SJS4, C71AJ_APIGR; C0SJS2, C71AJ_PASSA; //