Abstract
Fusarium chlamydosporum is the causal agent of stem rot in Jacaranda acutifolia. Bacillus amyloliquefaciens is an endophytic bacterium that shows promising biological control activity against F. chlamydosporum. In this study, B. amyloliquefaciens was cultured in a fermentation broth, and the main antimicrobial substance in the fermentation broth was isolated using the ammonium sulfate precipitation method and purified by DEAE sepharose fast flow weak anion exchange chromatography and sephadex G-50 molecular sieve chromatography. Polyacrylamide gel electrophoresis revealed a single antimicrobial protein with a molecular weight of approximately 29.0 kDa. The antimicrobial protein is a strong antagonist against F. chlamydosporum, leading to mycelial deformity, unclear mycelial septa, and isolated and granulated intracellular protoplasm. The N-terminal eight-amino acid sequence, NH2-Gly-Arg-Pro-Leu-Pro-Leu-Ala-Ala, was determined using the automatic Edman degradation method. BLAST analysis indicated that the amino acid residue sequence at positions 154–161 shows 100% homology to the hypothetical protein of Chromobacterium sp. LK1. However, no known homologous antimicrobial protein was identified, indicating that we have isolated a novel antimicrobial protein.
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Acknowledgements
This work was supported by the Foundation of National Science and Technology Platform Infrastructure (Grant No. 2005DK21207-13).
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Zhu, Hm., Pan, Yz. A novel antimicrobial protein of the endophytic Bacillus amyloliquefaciens and its control effect against Fusarium chlamydosporum. BioControl 64, 737–748 (2019). https://doi.org/10.1007/s10526-019-09972-y
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DOI: https://doi.org/10.1007/s10526-019-09972-y