Five new diterpene glycosides, virescenosides Z4-Z8 (1-5) have been isolated from a marine strain of Acremonium striatisporum KMM 4401 associated with the holothurian Eupentacta fraudatrix. Their structures were determined by HRESI-MS and 1D and 2D NMR. Virescenosides Z4-Z8 contain rare altruronic acid 4C1 and 1C4 conformations as their carbohydrate components. Virescenosides Z5 and Z7 exhibit an unusual 16-chloro, 15-hydroxyethylgroup as their side chains.
altruronic acid, Acremonium striatisporum, marine-derived fungus, virescenosides
NCBI PubMed ID: 21922899Journal NLM ID: 101477873Publisher: Natural Product Communications
Correspondence: afiyat@piboc.dvo.ru
Institutions: Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
Methods: 13C NMR, 1H NMR, methylation, NMR-2D, TLC, GC, HPLC, UV, extraction, optical rotation measurement, reduction, CC, cell growth, HR-ESI-MS, evaporation, LC, HR-MALDI-TOF