Abstract
The incorporation of L-[methyl-3H,14C]methionine or L-(methyl-2H3)methionine into 2 beta-methyldiplopterol of Methylobacterium organophilum and various 3 beta-methylhopanoids of Acetobacter pasteurianus ssp. pasteurianus showed that all three hydrogen atoms of the transferred methyl group are retained in the triterpenoids. These methylations are compatible with a methylation substrate such as a delta 2-hopanoid in the case of the 2 beta-methylhopanoid biosynthesis and of a delta 2-hopanoid or squalene in the case of the formation of 3 beta-methylhopanoids. The intervention of intermediates possessing an exomethylene group or a cyclopropane ring is excluded.
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