Sarcosenones A–C, Highly Oxygenated Pimarane Diterpenoids from an Endolichenic Fungus Cite This: RSC Adv., 2020, 10,15622 Sarcosomataceae Sp.†
RSC Advances View Article Online PAPER View Journal | View Issue Sarcosenones A–C, highly oxygenated pimarane diterpenoids from an endolichenic fungus Cite this: RSC Adv., 2020, 10,15622 Sarcosomataceae sp.† Xintong Hou,ab Yang Xu,b Shuaiming Zhu,c Yang Zhang, *c Liangdong Guo,d Feng Qiu a and Yongsheng Che*ab Three new highly oxygenated pimarane diterpenoids, sarcosenones A–C(1–3), and the known 9a- Received 17th March 2020 hydroxy-1,8(14),15-isopimaratrien-3,7,11-trione (4), were isolated from cultures of an endolichenic Accepted 6th April 2020 fungus Sarcosomataceae sp. Their structures were elucidated based on NMR spectroscopic data and DOI: 10.1039/d0ra02485f electronic circular dichroism (ECD) calculations. Compound 1 showed moderate cytotoxicity against rsc.li/rsc-advances a small panel of four human tumor cell lines, with IC50 values of 7.5–26.4 mM. nematicidal effect, inhibitory activity of IL-6 signalling medi- Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Introduction ated by SATA3, and cytotoxic activity.15,19 Pimarane diterpenoids have been encountered as secondary Lichens are combinations of a fungus (the mycobiont) and metabolites of higher plants, fungi, and marine organisms.1 an algal partner (the photobiont or phycobiont). In addition to This class of diterpenes can be derived from the original core by fungal mycobionts, some nonobligate microfungi, endolichenic substitution, hydroxylation, acetylation, rearrangement, fungi, are also found to live asymptomatically in the bodies bromination, and ring expansion reactions.2 Since the isolation (thalli) of lichens.23 Endolichenic fungi have been demonstrated of pimaric acid, the rst example of this class, in 1839,3 to be a rich source of new bioactive natural products.24 During pimarane diterpenoids have attracted considerable interest due our continuous search for new cytotoxic metabolites from the 23,25–27 This article is licensed under a to their remarkable structural diversity and great antimalarial,4 endolichenic fungi, the fungus Sarcosomataceae sp.
[Show full text]