Abstract
During our screening for anti-mycobacterial agents against Mycobacterium avium complex (MAC), two new polycyclic tetramate macrolactams (PTMs), named hydroxycapsimycin (1) and brokamycin (2), were isolated along with the known PTM, ikarugamycin (3), from the culture broth of marine-derived Streptomyces sp. KKMA-0239. The relative structures of 1 and 2 were elucidated by spectroscopic data analyses, including 1D and 2D NMR. Furthermore, the absolute configuration of 1 was confirmed by a single-crystal X-ray diffraction analysis. Compounds 2 and 3 exhibited moderate antimycobacterial activities against MAC, including clinically isolated drug-resistant M. avium.
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Acknowledgements
We express our thanks to Ms. Noriko Sato and Ms. Reiko Seki, the School of Pharmacy, Kitasato University for instrumental measurements and Mr. Shunto Kubota, the School of Pharmacy, Kitasato University for assisting with our experiments. This work was supported by the Uehara Memorial Foundation (to HT) and a Kitasato University Research Grant for Young Researchers (to SS).
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Shigeno, S., Kadowaki, M., Nagai, K. et al. New polycyclic tetramate macrolactams with antimycobacterial activity produced by marine-derived Streptomyces sp. KKMA-0239. J Antibiot 77, 265–271 (2024). https://doi.org/10.1038/s41429-024-00710-w
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DOI: https://doi.org/10.1038/s41429-024-00710-w