ArticleAntonie van Leeuwenhoek2024
Separation and purification of antimicrobial substances from Paenibacillus polymyxa KH-19 and analysis of its physicochemical characterization.
Article in Antonie van Leeuwenhoek, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Soft rot is one of the top ten most dangerous plant pathogens in agricultural production, storage, and transport, and the use of microorganisms and their metabolites to control soft rot is a current research hotspot. In this study, we identified the antimicrobial substance in the metabolite of Paenibacillus polymyxa KH-19, and determined that the antimicrobial substance of this strain was an active protein. The protein was completely precipitated at 40-60% ammonium sulphate saturation and showed good inhibitory effects against seven pathogenic bacteria including Pectobacterium carotovorum BC2 and seven pathogenic fungi including Pyricularia oryzae. The MIC of the protein was 51.563 µg/mL, temperature acid-base UV and light stability insensitive to protease, with high-temperature resistance. The antimicrobial protein was isolated and purified by DEAE-anion exchange column and Sephadex G-75 gel filtration chromatography, and the LC-MS/MS assay identified the protein as lysophosphatidyl esterase with a molecular weight of 25.255 kDa. The purified antimicrobial protein increased the inhibitory effect against P. carotovorum BC2, with the diameter of the circle of inhibition being 26.50 ± 0.915 mm. Bioinformatics analysis showed that the protein has the molecular formula of C
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