Add time:08/09/2019         Source:sciencedirect.com

To understand the early steps of C27 brassinosteroid biosynthesis, metabolic experiments were performed with Arabidopsis thaliana and Nicotiana tabacum seedlings, and with cultured Catharanthus roseus cells. [26, 28-2H6]Campestanol, [26-2H3]cholesterol, and [26-2H3]cholestanol were administered to each plant, and the resulting metabolites were analyzed by gas chromatography–mass spectrometry. In all the species examined, [2H3]cholestanol was identified as a metabolite of [2H6]campestanol, and [2H3]cholest-4-en-3-one and [2H3]cholestanol were identified as metabolites of [2H3]cholesterol. This study revealed that cholestanol (C27 sterol) was biosynthesized from both cholesterol (C27 sterol) and campestanol (C28 sterol). It was also demonstrated that cholestanol was converted to 6-oxocholestanol, and campestanol was converted to 6-oxocampestanol.

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