IUBMB Enzyme Nomenclature


Accepted name: stemar-13-ene synthase

Reaction: 9α-copalyl diphosphate = stemar-13-ene + diphosphate

For diagram of reaction, click here

Glossary: syn-copalyl diphosphate = 9α-copalyl diphosphate

Other name(s): OsDTC2; OsK8; OsKL8; OsKS8; stemarene synthase; syn-stemar-13-ene synthase

Systematic name: 9α-copalyl-diphosphate diphosphate-lyase (stemar-13-ene-forming)

Comments: This diterpene cyclase produces stemar-13-ene, a putative precursor of the rice phytoalexin oryzalexin S. Phytoalexins are diterpenoid secondary metabolites that are involved in the defense mechanism of the plant, and are produced in response to pathogen attack through the perception of elicitor signal molecules such as chitin oligosaccharide, or after exposure to UV irradiation.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Mohan, R.S., Yee, N.K., Coates, R.M., Ren, Y.Y., Stamenkovic, P., Mendez, I. and West, C.A. Biosynthesis of cyclic diterpene hydrocarbons in rice cell suspensions: conversion of 9,10-syn-labda-8(17),13-dienyl diphosphate to 9β-pimara-7,15-diene and stemar-13-ene. Arch. Biochem. Biophys. 330 (1996) 33-47. [PMID: 8651702]

2. Nemoto, T., Cho, E.M., Okada, A., Okada, K., Otomo, K., Kanno, Y., Toyomasu, T., Mitsuhashi, W., Sassa, T., Minami, E., Shibuya, N., Nishiyama, M., Nojiri, H. and Yamane, H. Stemar-13-ene synthase, a diterpene cyclase involved in the biosynthesis of the phytoalexin oryzalexin S in rice. FEBS Lett. 571 (2004) 182-186. [PMID: 15280039]

[EC created 2008]

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