Abstract
Bacillus mojavensis B0621A was isolated from a pearl oyster Pinctada martensii collected from South China Sea. While screening for cyclic lipopeptides potentially useful as lead compounds for biological control against soil-bone fungal plant pathogens, three lipopeptides were isolated and purified from the fermentation broth of B. mojavensis B0621A via vacuum flash chromatography coupled with reversed-phase high performance liquid chromatography (RP-HPLC). The structural characterization and identification of these cyclic lipopeptides were performed by tandem mass spectrometry (MS/MS) combined with gas chromatography-mass spectrometry (GC-MS) analysis as well as chemical degradation. These lipopeptides were finally characterized as homologues of mojavensins, which contained identical amino acids back bones of asparagine1, tyrosine2, asparagine3, glutamine4, proline5, asparagine6, and asparagine7 and differed from each other by their saturated β-amino fatty acid chain residues, namely, iso-C14 mojavensin, iso-C16 mojavensin, and anteiso-C17 mojavensin, respectively. All lipopeptide isomers, especially iso-C16 mojavensin and anteiso-C17 mojavensin, displayed moderate antagonism and dose-dependent activity against several formae speciales of Fusarium oxysporum and presented surface tension activities. These properties demonstrated that the lipopeptides produced by B. mojavensis B0621A may be useful as biological control agent to fungal plant pathogens.
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This work was supported by the National Science & Technology Pillar Program (No.2011BAE06B04-03).
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Ma, Z., Hu, J. Production and Characterization of Iturinic Lipopeptides as Antifungal Agents and Biosurfactants Produced by a Marine Pinctada martensii-Derived Bacillus mojavensis B0621A. Appl Biochem Biotechnol 173, 705–715 (2014). https://doi.org/10.1007/s12010-014-0879-1
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DOI: https://doi.org/10.1007/s12010-014-0879-1