Oxidosqualene cyclase converting oxidosqualene to cycloartenol. Required for the production of sterols. (S)-2,3-epoxysqualene = cycloartenol Expressed in thickened roots and root nodules. Constant levels of expression during germination and throughout the year. No effect of methyl jasmonate (MeJA) or gibberellin A3 (GA3). Belongs to the terpene cyclase/mutase family.