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α-Gurjunene synthase (EC 4.2.3.72) is an enzyme with systematic name(2E,6E)-farnesyl-diphosphate diphosphate-lyase ((–)-α-gurjunene-forming). This enzyme catalyses the following chemical reaction
Initial cyclization probably gives bicyclogermacrene in an enzyme-bound form.
References
Schmidt CO, Bouwmeester HJ, Bülow N, König WA (April 1999). "Isolation, characterization, and mechanistic studies of (-)-α-gurjunene synthase from Solidago canadensis". Archives of Biochemistry and Biophysics. 364 (2): 167–77. doi:10.1006/abbi.1999.1122. PMID10190971.