Novel bacterial triterpenoids of the hopane series from Nitrosomonas europaea and their significance for the formation of the C35 bacteriohopane skeleton

In addition to aminobacteriohopanetriol and adenosylhopane, three new hopanoids were isolated from the bacterium Nitrosomonas europaea: two N-acylaminobacteriohopanetriols, a hopanoid presenting a carbon/carbon bond between ribonolactone and hopane and related to a putative intermediate involved in the formation of the C-35 bacteriohopane skeleton and finally a condensation product between aminobacteriohopanetriol and trinorbacteriohopan-32-al, an artifact resulting from the autoxidation of the aminotriol. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.