α-Amyrin synthase (, 2,3-oxidosqualene alpha-amyrin cyclase, mixed amyrin synthase) is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, alpha-amyrin-forming). This enzyme catalyses the following chemical reaction
(3S)-2,3-epoxy-2,3-dihydrosqualene alpha-amyrin
This multifunctional enzyme produces both alpha- and beta-amyrin.
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