(+)-alpha-pinene synthase
class of enzymes

(+)-α-pinene synthase (EC 4.2.3.121, (+)-α-pinene cyclase, cyclase I) is an enzyme with systematic name geranyl-diphosphate diphosphate-lyase [cyclizing, (+)-α-pinene-forming]. This enzyme catalyses the following chemical reaction
geranyl diphosphate
⇌
{\displaystyle \rightleftharpoons }
(+)-α-pinene + diphosphate
Cyclase I of Salvia officinalis (sage) gives about equal parts (+)-α-pinene and (+)-camphene.
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