The major bacterial triterpenoids of the hopane series each consist of a C30 triterpene hopane moiety and an additional nonterpene C5 side chain derived from D-ribose and linked through its C-5 carbon atom to the hopane side chain. Bacteriohopanetetrol and aminobacteriohopanetriol are the most common representatives of this natural product series, adenosylhopane and ribosylhopane being putative precursors. Deuterium-labelled ribosylhopane was obtained by hemisynthesis and converted into deuterium-labelled bacteriohopanetetrol in the presence of NADPH, thus giving evidence of this as yet unknown precursor-to-product relationship in the bacterial hopanoid metabolic pathway.
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