Reaction: (+)-cis,trans-nepetalactol + 3 [reduced NADPH—hemoprotein reductase] + 3 O2 = 7-deoxyloganetate + 3 [oxidized NADPH—hemoprotein reductase] + 4 H2O (overall reaction)
(1a) (+)-cis,trans-nepetalactol + [reduced NADPH—hemoprotein reductase] + O2 = 7-deoxyloganetic alcohol + [oxidized NADPH—hemoprotein reductase] + H2O
(1b) 7-deoxyloganetic alcohol + [reduced NADPH—hemoprotein reductase] + O2 = iridotrial + [oxidized NADPH—hemoprotein reductase] + 2 H2O
(1c) iridotrial + [reduced NADPH—hemoprotein reductase] + O2 = 7-deoxyloganetate + [oxidized NADPH—hemoprotein reductase] + H2O
For diagram of reaction click here
Glossary: (+)-cis,trans-nepetalactol = (4aS,7S,7aR)-4,7-dimethyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-1-ol
7-deoxyloganetate = (1S,4aS,7S,7aR)-1-hydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-4-carboxylate
Other name(s): CYP76A26 (gene name); iridoid oxidase (misleading)
Systematic name: (+)-cis,trans-nepetalactol,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (hydroxylating)
Comments: The enzyme, characterized from the plant Catharanthus roseus, is a cytochrome P-450 (heme thiolate) protein. It catalyses three successive reactions in the pathway leading to biosynthesis of monoterpenoid indole alkaloids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Miettinen, K., Dong, L., Navrot, N., Schneider, T., Burlat, V., Pollier, J., Woittiez, L., van der Krol, S., Lugan, R., Ilc, T., Verpoorte, R., Oksman-Caldentey, K.M., Martinoia, E., Bouwmeester, H., Goossens, A., Memelink, J. and Werck-Reichhart, D. The seco-iridoid pathway from Catharanthus roseus. Nat Commun 5 (2014) 3606. [PMID: 24710322]