ID 1.14.14.180 DE brassinolide synthase. AN CYP85A2. AN CYP85A3. CA castasterone + O2 + reduced [NADPH--hemoprotein reductase] = brassinolide CA + H(+) + H2O + oxidized [NADPH--hemoprotein reductase]. CC -!- This cytochrome P450 (heme thiolate) plant enzyme catalyzes the CC lactonization of several brassinosteroids, including castasterone, CC teasterone, and typhasterol. CC -!- The CYP85A2 enzyme of Arabidopsis thaliana also catalyzes the CC activity of EC 1.14.14.179. DR Q940V4, C85A2_ARATH; Q50LE0, C85A3_SOLLC; //