ID 1.14.14.176 DE taxadiene 5alpha-hydroxylase. CA O2 + reduced [NADPH--hemoprotein reductase] + taxa-4,11-diene = H(+) + CA H2O + oxidized [NADPH--hemoprotein reductase] + taxa-4(20),11-dien- CA 5alpha-ol. CC -!- This microsomal cytochrome-P450 (heme-thiolate) enzyme is involved in CC the biosynthesis of the diterpenoid antineoplastic drug taxol CC (paclitaxel). CC -!- The reaction includes rearrangement of the 4(5)-double bond to a CC 4(20)-double bond, possibly through allylic oxidation. CC -!- Formerly EC 1.14.99.37. DR Q6WG30, T5H_TAXCU ; //