Component of the oleanane-type triterpene saponins (e.g. ginsenosides or panaxosides) biosynthetic pathway (PubMed:29378087). Oxidosqualene cyclase converting oxidosqualene into beta-amyrin, generating five rings and eight asymmetric centers in a single transformation (By similarity). (S)-2,3-epoxysqualene = beta-amyrin Secondary metabolite biosynthesis; terpenoid biosynthesis. Monomer. Belongs to the terpene cyclase/mutase family.