Alpha-amyrin synthase

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 $$\rightleftharpoons$$ alpha-amyrin

This multifunctional enzyme produces both alpha- and beta-amyrin.