Abstract
Two new diketopiperazines, namely samsoniellain A (1) and samsoniellain B (2), together with two known compounds (3, 4) were isolated from Cordyceps fungus Samsoniella sp. XY4. The planar structures of 1 and 2 were determined by HRESIMS, 1D and 2D NMR spectroscopy. The absolute configurations of 1 and 2 were determined by comparison of quantum chemical TDDFT calculated and experimental ECD spectra. Results of antimicrobial activity indicated that compound 2 showed weak bacteriostatic activities against S. typhimurium χ 8956, H. influenza ATCC 10211, MRSA 2024 with the MIC values of 128, 256, and 256 μg ml−1, respectively. This is the first report about secondary metabolites of Samsoniella sp.
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Acknowledgements
This work was financially supported by grants from the Natural Science Foundation of China (Nos. 31960001 and 82260687), Yunnan Provincial Science and Technology Department-Applied Basic Research Joint Special Funds of Yunnan University of Chinese Medicine (No. 202101AZ070001-204), Yunnan Province Ten Thousand People Program “Young Top Talents” Special Project (YNWR-QNBJ-2019-161).
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Zhang, KT., Huang, ZP., Xu, XR. et al. Two new diketopiperazines from the Cordyceps fungus Samsoniella sp. XY4. J Antibiot 76, 735–740 (2023). https://doi.org/10.1038/s41429-023-00662-7
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DOI: https://doi.org/10.1038/s41429-023-00662-7