Twelve new lanostane triterpenoids, sterenoids A–L (1–12) have been isolated from fruiting bodies of the basidiomycete Stereum sp. Compounds 1–12 are rare 14(13→12)abeo-lanostane triterpenoids featuring remarkable 13R configurations that discriminate from the previously covered counterparts. Their structures and absolute configurations are assigned on the basis of in-depth one- and two-dimensional NMR spectroscopic analysis, as well as unbiased quantum chemical NMR and electronic CD calculations. All isolates are evaluated for their in vitro cytotoxicity against five human tumor cell lines. Compound 5 exhibits potent cytotoxic activities against tumor cell lines HL-60 and SMMC-7721 with IC50 values of 4.7 and 7.6 μM, respectively.
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This work was financially supported by National Natural Science Foundation of China (81561148013 and 81373289) and the Key Projects of Technological Innovation of Hubei Province (number 2016ACA138). Computational resources used in this work were supported in part by HPC Center, Kunming Institute of Botany, CAS, China. We thank Professor Yu-Cheng Dai of Beijing Forestry University, for the identification of the mushroom. We wish to thank Dr Tian Lu (Beijing Kein Research Center for Natural Sciences) for his fruitful discussions in the quantum chemical calculations with Gaussian 09.
The authors declare no conflict of interest.
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Yao, JN., Chen, L., Tang, Y. et al. Lanostane triterpenoids from fruiting bodies of basidiomycete Stereum sp., structures and biological activities. J Antibiot 70, 1104–1111 (2017). https://doi.org/10.1038/ja.2017.122
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