Abstract
An anti-mannheimiosis agent, aldsulfin, was isolated from a culture broth of the fungus Lasiodiplodia pseudotheobromae FKI-4499, together with a known compound, lasiodipline C, using bioassay-guided fractionation. Spectroscopic analysis of aldsulfin, using NMR, mass spectrometry, and CD analyses revealed it to be an epithiodiketopiperazine with an unstable and unusual hemithioaminal moiety. Aldsulfin showed antibacterial activity against Mannheimia haemolytica and Pasteurella multocida.
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Acknowledgements
We are grateful to Dr. Kenichiro Nagai and Noriko Sato, School of Pharmacy, Kitasato University for measurements of mass and NMR spectra. Dr. Aoi Kimishima for giving me the knowledge of organic chemistry. We sincerely thank Dr. Yoshihiro Shimizu, Dr. Osamu Yoshida, and Dr. Robert L. Harris, Animal Health Division, Eli Lilly Inc. (separated as Elanco Animal Health Inc.) for valuable help on this screening program. This study was partially supported by 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 and Development (AMED) under Grant Numbers JP19am0101096.
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Sakai, K., Iwatsuki, M., Iizuka, M. et al. Aldsulfin, a novel unusual anti-mannheimiosis epithiodiketopiperazine antibiotic produced by Lasiodiplodia pseudotheobromae FKI-4499. J Antibiot 74, 363–369 (2021). https://doi.org/10.1038/s41429-021-00411-8
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DOI: https://doi.org/10.1038/s41429-021-00411-8
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