A new peptide, emblestatin (1), was discovered from a culture broth of Embleya scabrispora K20-0267. This strain was isolated from soil using an agar medium containing lysozyme. Based on NMR and mass spectrometric analyses, 1 consists of 2-(2-hydroxyphenyl)-2-oxazoline, β-alanine, glutamine, Nα-methyl-Nω-hydroxyornithine and 3-amino-1-hydroxy-2-piperidone moieties. Further analysis using the advanced Marfey’s method revealed that all amino acids with the stereogenic α-carbon in 1 had the l configuration. Compound 1 exhibited iron chelating activity and weak antibacterial activity against Proteus vulgaris and Staphylococcus aureus.
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We are grateful to Distinguished Emeritus Professor Satoshi Ōmura (Kitasato University) for his helpful support and valuable suggestions. This study was partially supported by a Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science, and Technology of Japan under Grant Number 19H05685 and the Platform Project for Supporting Drug Discovery and Life Science Research (Basis for Supporting Innovative Drug Discovery and Life Science Research (BINDS)) from the Japan Agency for Medical Research & Development (AMED) under Grant Numbers JP19am0101096 (Phase I) and JP22ama121035 (Phase II).
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Awano, Y., Tsutsumi, H., Kikuchi, Y. et al. Emblestatin: a new peptide antibiotic from Embleya scabrispora K20-0267. J Antibiot 76, 592–597 (2023). https://doi.org/10.1038/s41429-023-00645-8