Abstract
Three new compounds including two thiodiketopiperazine derivatives shovelmycins A–B (1–2), and one ansamycin derivative divergolide X (3) were isolated and identified from the culture extract of Streptomyces olivaceus HDN22-001, a marine actinomycete obtained from the deep-sea cold seep sediment sample collected from the South China Sea. Their structures and absolute configurations were determined by spectroscopic analyses and ECD calculations. Compound 1 exhibited the strongest DPPH radical scavenging activity with an IC50 value of 10.83 μM, which was better than that of the positive control vitamin C. And compound 2 was modestly cytotoxic against NCl-H446 cell with the IC50 value of 26.6 μM.
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities (202362008, 202172002), the Shandong Provincial Natural Science Foundation (ZR2021MH257), the National Key Research and Development Program of China (2022YFC2804400).
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Li, C., Cheng, J., Liu, R. et al. The thiodiketopiperazine derivatives shovelmycin A–B and ansamycin derivative divergolide X from the cold-seep-derived Streptomyces olivaceus HDN22-001. J Antibiot 78, 275–280 (2025). https://doi.org/10.1038/s41429-025-00812-z
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DOI: https://doi.org/10.1038/s41429-025-00812-z