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Generation of incednine derivatives by mutasynthesis

Abstract

The macrolactam antibiotic incednine, isolated from Streptomyces sp. ML694–90F3, contains a (S)-3-aminobutyric acid moiety in its polyketide aglycon. In this study, we performed mutasynthesis to generate incednine derivatives. We successfully obtained 28-methylincednine by feeding 3-aminopentanoic acid into culture of a strain in which the glutamate 2,3-aminomutase gene idnL4, whose product is responsible for supplying 3-aminobutyric acid, was disrupted. 28-Methylincednine showed similar suppressive activity of the antiapoptotic function of oncoprotein Bcl-xL to that of incednine. Thus, this study highlights the applicability of the mutasynthesis approach in generation of novel β-amino acid-containing macrolactam polyketide derivatives.

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Acknowledgements

This work was supported in part by a Grant-in-Aid from the Institute for Fermentation, Osaka (AM), Nagase Science Technology Foundation (FK), Takeda Science Foundation (FK), and by a Grant-in-Aid for Scientific Research on Innovative Areas (23108509 to FK and 16H06451 to TE) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The authors thank Dr. Yoshio Ando for his kind assistance in operating the Bruker micrOTOF-Q II mass spectrometer. The authors also thank Daisuke Kawasaki and Sotaro Takahashi for obtaining optical rotation data and UV spectra.

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Correspondence to Tadashi Eguchi.

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Miyanaga, A., Takaku, R., Takaishi, M. et al. Generation of incednine derivatives by mutasynthesis. J Antibiot 73, 794–797 (2020). https://doi.org/10.1038/s41429-020-0329-y

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