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  • Title: Identification of novel surfactin derivatives from NRPS modification of Bacillus subtilis and its antifungal activity against Fusarium moniliforme.
    Author: Jiang J, Gao L, Bie X, Lu Z, Liu H, Zhang C, Lu F, Zhao H.
    Journal: BMC Microbiol; 2016 Mar 09; 16():31. PubMed ID: 26957318.
    Abstract:
    BACKGROUND: Bacillus subtilis strain PB2-L1 produces the lipopeptide surfactin, a highly potent biosurfactant synthesized by a large multimodular nonribosomal peptide synthetase (NRPS). In the present study, the modules SrfA-A-Leu, SrfA-B-Asp, and SrfA-B-Leu from surfactin NRPS in B. subtilis BP2-L1 were successfully knocked-out using a temperature-sensitive plasmid, pKS2-mediated-based, homologous, recombination method. RESULTS: Three novel surfactin products were produced, individually lacking amino acid Leu-3, Asp-5, or Leu-6. These surfactins were detected, isolated, and characterized by HPLC and LC-FTICR-MS/MS. In comparison with native surfactin, [∆Leu(3)]surfactin and [∆Leu(6)]surfactin showed evidence of reduced toxicity, while [∆Asp(5)]surfactin showed stronger inhibition than native surfactin against B. pumilus and Micrococcus luteus. These results showed that the minimum inhibitory concentration of [∆Leu(6)]surfactin for Fusarium moniliforme was 50 μg/mL, such that [∆Leu(6)]surfactin could lead to mycelium projection, cell damage, and leakage of nucleic acids and protein. These factors all contributed to stimulating apoptosis in F. moniliforme. CONCLUSIONS: The present results revealed that [∆Leu(6)]surfactin showed a significant antifungal activity against F. moniliforme and might successfully be employed to control fungal food contamination and improve food safety.
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