Cycloartenol-derived sterol biosynthesis in the Peronosporales

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Abstract
Selected species of the order Peronosporales [Phytophthora cinnamomi, P. infestans, P. cryptogea, P. parasitica var. nicotianae, P. cactorum, Pythium debaryanum and Peronophythora litchii], which are unable to epoxidize squalene and thus synthesize sterols, are able to metabolize exogenous cycloartenol to lanosterol and in some organisms to fucosterol, ergosterol and cholesterol. Lanosterol was less effectively utilized but some ergosterol and cholesterol were yielded. Fucosterol was very efficiently metabolized by most species to ergosterol, .DELTA.7-ergostenol, .DELTA.5-ergostenol, cholestanol and cholesterol. Several unknown sterols were present in most trials. Evidently, a vestigial sterol synthetic pathway derived from cycloartenol, followed by possible isomerization ot lanosterol and then to other sterol exists.

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