Tirucalladienol synthase (, PEN3) is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, tirucalla-7,24-dien-3beta-ol-forming). This enzyme catalyses the following chemical reaction
(3S)-2,3-epoxy-2,3-dihydrosqualene tirucalla-7,24-dien-3beta-ol
The product from Arabidopsis thaliana is tirucalla-7,24-dien-3beta-ol.
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