Abstract
A marine-sediment-derived bacterium Bacillus velezensis SH-B74 can produce cyclic lipopeptides (CLPs). This study presented the isolation, characterization, and activity evaluation of a new CLP from the bacterial cultures of the strain SH-B74. Multiple chromatographic methods (solid-phase extraction and reversed-phase high-performance liquid chromatography) were applied to the purifying procedure of CLP, and the structural characterization of the new CLP was conducted by various spectroscopy (1D and 2D nuclear magnetic resonance together with Fourier transform infrared spectroscopy) and spectrometry (liquid chromatography-mass spectrometry, high-resolution mass spectrometry and tandem mass spectrometry) techniques as well as Marfey’s method. The results displayed that the new CLP (anteiso-C15 Ile2,7 surfactin, 1) consists of a peptidic backbone of l-Glu1, l-Ile2, d-Leu3, l-Val4, l-Asp5, d-Leu6, l-Ile7, and an anteiso-C15 type saturated fatty acid chain. Further activity assay showed that the new CLP displays activity on the inhibition of the appressoria formation of rice blast causal pathogen Magnaporthe oryzae. To sum up, the results presented the perspective of potential application of the new CLP as a green agrichemical to control M. oryzae.
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Acknowledgements
Research grants from the Project for Enhancing the Research Capability of Young Teachers in Northwest Normal University (given to Z.M., no. NWNU-LKQN-18-26) and from the National Science Foundation of China (given to J.H., no. 41776178) are acknowledged for supporting this study.
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Z.M. conceived, designed, and conducted all the experiments. Z.M. wrote the manuscript. Z.M., Songya Z., Shihu Z., J.L., K.S., and J.H. together improved the manuscript and approved the final version of the manuscript for submission. G.W., Y.S., and Q.M. were involved in the revision process of the manuscript.
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Ma, Z., Zhang, S., Zhang, S. et al. Isolation and characterization of a new cyclic lipopeptide surfactin from a marine-derived Bacillus velezensis SH-B74. J Antibiot 73, 863–867 (2020). https://doi.org/10.1038/s41429-020-0347-9
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DOI: https://doi.org/10.1038/s41429-020-0347-9
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