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Zhou, Li-Man; Kong, Fan-Dong; Fan, Peng; Ma, Qing-Yun; Xie, Qing-Yi; Li, Jiu-Hui; Zheng, Hai-Zhou; Zheng, Zhi-Hui; Yuan, Jing-Zhe; Dai, Hao-Fu; Luo, Du-Qiang; Zhao, You-Xing
Journal of natural products (Washington, D.C.), 09/2019, Letnik: 82, Številka: 9Journal Article
Five new indole-terpenoids named penerpenes E–I (1–5), along with seven known ones (6–12), were isolated from the marine-derived fungus Penicillium sp. KFD28 from a bivalve mollusk, Meretrix lusoria. The structures of the new compounds were elucidated from spectroscopic data and ECD spectroscopic analyses. Compound 1 was assigned as an indole-diterpenoid with a unique 6/5/5/6/6/5/5 heptacyclic ring system. Compound 2 represents an indole-diterpenoid with a new carbon skeleton derived from paxilline by the loss of three carbons (C-23/24/25). Compound 3 contains an additional oxygen atom between C-21 and C-22 compared to paxilline to form an unusual 6/5/5/6/6/7 hexacyclic ring system bearing a 1,3-dioxepane ring, which is rarely encountered in natural products. Compounds 1, 2, 4, and 6 showed inhibitory activities against protein tyrosine phosphatase 1B (PTP1B) with IC50 values of 14, 27, 23, and 13 μM, respectively.
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in: SICRIS
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