Prokaryotic triterpenoids

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Abstract
3.beta.-Methylbacteriohopanepolyol derivatives were isolated from 3 bacteria, A. pasteurianus ssp. pasteurianus, M. capsulatus and Nostoc muscorum, and identified by spectroscopic methods and direct comparison with 3.beta.-methyldiplopterol and 3.beta.-methylhopan-29-ol synthesized from 22-hydroxyhopan-3-one. The 3.beta.-methylhopanoid content of A. pasteurianus ssp. pasteurianus could be dramatically increased (.ltoreq. 60% of the total hopanoid content) by addition of L-methionine, the actual methyl donor, to the culture medium.