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A non-cyclic baboon θ-defensin derivative exhibiting antimicrobial activity against the phytopathogen Verticillium dahliae

  • Applied Genetics and Molecular Biotechnology
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Abstract

θ-Defensins are the only natural cyclic proteins found in primates. They have strong antimicrobial activity related to their trisulfide ladders and macrocyclic conformation. A non-cyclic baboon θ-defensin (BTD) was synthesized by substituting valine with phenylalanine at position 17, at the C-terminal end of the BTD; this was termed “BTD-S.” The antimicrobial activities of this synthetic peptide were investigated against Escherichia coli and two cotton phytopathogens: Verticillium dahliae and Fusarium oxysporum. The minimum inhibitory concentration (MIC) of BTD-S for E. coli was 10 μg/mL and for V. dahliae was 5 μg/mL, significantly lower than that for F. oxysporum (40.0 μg/mL). A time course analysis of fungal cultures indicated that the growth of V. dahliae was completely inhibited after 96 h of BTD-S treatment. Furthermore, hemolysis assays revealed that BTD-S was not toxic to mammalian cells as it could not induce lysis of sheep red blood cells even at ten times the MIC (50 μg/mL). Scanning electron microscopy and double-stained (calcofluor white and propidium iodide binding) fluorescence microscopy showed that exposure of spores of V. dahliae to BTD-S either disabled normal germination or disintegrated the spores. The size of cells exposed to BTD-S was significantly reduced compared with controls, and their number increased in a dose-dependent curve when measured by flow cytometry. These findings suggest that BTD-S has great potential to inhibit the growth of V. dahliae and can be utilized as an effective remedy to control economic losses caused by Verticillium wilt in the development of wilt-resistant cotton.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 31171616) and the Ministry of Agriculture (2009ZX08009-061B).

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Authors and Affiliations

  1. Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, People’s Republic of China

    Mi Ni, Yijing Zhao, Noreen Bibi, Mingyan Shao, Shuna Yuan, Kai Fan, Gaixia Zhang, Feng Li & Xuede Wang

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  1. Mi Ni
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Correspondence to Xuede Wang.

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Ni, M., Zhao, Y., Bibi, N. et al. A non-cyclic baboon θ-defensin derivative exhibiting antimicrobial activity against the phytopathogen Verticillium dahliae . Appl Microbiol Biotechnol 97, 2043–2052 (2013). https://doi.org/10.1007/s00253-012-4309-4

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