Description
Isolated from Abies grandis (grand fir). This class I enzyme forms about equal proportions of abietadiene, levopimaradiene and neoabietadiene. See also EC 4.2.3.18, abieta-7,13-diene synthase and EC 4.2.3.32, levopimaradiene synthase. An X-ray study of this multifunctional enzyme showed that the class I activity is in the α domain, while (+)-copalyl diphosphate synthase activity (EC 5.5.1.12, a class II activity) is in the β and γ domains. In Pinus taeda (loblolly pine) the major product is levopimaradiene, with less abietadiene and neoabietadiene.
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