ID 4.2.3.227 DE (-)-alpha-cedrene synthase. CA (2Z,6E)-farnesyl diphosphate = (-)-alpha-cedrene + diphosphate. CC -!- The enzyme occurs in plants. CC -!- The initial cyclization product is a (7R)-beta-bisabolyl cation. CC -!- (-)-alpha-cedrene is one of the major products. CC -!- Other products are (+)-2-epi-prezizaene (cf. EC 4.2.3.226), small CC amounts of (+)-beta-curcumene, and other sesquiterpenes with less CC than 10% yield. CC -!- The enzyme from Nicotiana tabacum (tobacco) also catalyzes the CC reaction of EC 4.2.3.61. DR Q40577, 5EAS_TOBAC ; //