Reaction: ent-cassa-12,15-diene + 3 [reduced NADPH—hemoprotein reductase] + 3 O2 = ent-3β-hydroxycassa-12,15-dien-2-one + 3 [oxidized NADPH—hemoprotein reductase] + 4 H2O (overall reaction)
(1a) ent-cassa-12,15-diene + [reduced NADPH—hemoprotein reductase] + O2 = ent-cassa-12,15-dien-2β-ol + [oxidized NADPH—hemoprotein reductase] + H2O
(1b) ent-cassa-12,15-dien-2β-ol + [reduced NADPH—hemoprotein reductase] + O2 = ent-cassa-12,15-dien-2-one + [oxidized NADPH—hemoprotein reductase] + 2 H2O
(1b′) ent-cassa-12,15-dien-2β-ol + [reduced NADPH—hemoprotein reductase] + O2 = ent-cassa-12,15-diene-2β,3β-diol + [oxidized NADPH—hemoprotein reductase] + H2O
(1c) ent-cassa-12,15-dien-2-one + [reduced NADPH—hemoprotein reductase] + O2 = ent-3β-hydroxycassa-12,15-dien-2-one + [oxidized NADPH—hemoprotein reductase] + H2O
(1c′) ent-cassa-12,15-diene-2β,3β-diol + [reduced NADPH—hemoprotein reductase] + O2 = ent-3β-hydroxycassa-12,15-dien-2-one + [oxidized NADPH—hemoprotein reductase] + 2 H2O
For diagram of reaction click here.
Other name(s): CYP71Z7
Systematic name: ent-cassa-12,15-diene,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (ent-3β-hydroxycassa-12,15-dien-2-one forming)
Comments: A cytochrome P-450 (heme-thiolate) protein isolated from the plant Oryza sativa (rice) that is involved in phytocassanes biosynthesis. Depending on the order of activities, the enzyme may form either ent-cassa-12,15-dien-2-one or ent-cassa-12,15-diene-2β,3β-diol as an intermediate.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Kitaoka, N., Wu, Y., Xu, M. and Peters, R.J. Optimization of recombinant expression enables discovery of novel cytochrome P450 activity in rice diterpenoid biosynthesis. Appl. Microbiol. Biotechnol. 99 (2015) 7549-7558. [PMID: 25758958]