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Large-Scale Purification, Characterization, and Spore Outgrowth Inhibitory Effect of Thurincin H, a Bacteriocin Produced by Bacillus thuringiensis SF361

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Abstract

Large-scale purification of the highly hydrophobic bacteriocin thurincin H was accomplished via a novel and simple two-step method: ammonia sulfate precipitation and C18 solid-phase extraction. The inhibition spectrum and stability of thurincin H as well as its antagonistic activity against Bacillus cereus F4552 spores were further characterized. In the purification method, secreted proteins contained in the supernatant of a 40 h incubated culture of B. thuringiensis SF361 were precipitated by 68 % ammonia sulfate and purified by reverse-phase chromatography, with a yield of 18.53 mg/l of pure thurincin H. Silver-stained SDS–PAGE, high-performance liquid chromatography, and liquid chromatography–mass spectrometry confirmed the high purity of the prepared sample. Thurincin H exhibited a broad antimicrobial activity against 22 tested bacterial strains among six different genera including Bacillus, Carnobacterium, Geobacillus, Enterococcus, Listeria, and Staphylococcus. There was no detectable activity against any of the selected yeast or fungi. The bacteriocin activity was stable for 30 min at 50 °C and decreased to undetectable levels within 10 min at temperatures above 80 °C. Thurincin H is also stable from pH 2–7 for at least 24 h at room temperature. Thurincin H is germicidal against B. cereus spores in brain heart infusion broth, but not in Tris–NaCl buffer. The efficient purification method enables the large-scale production of pure thurincin H. The broad inhibitory spectrum of this bacteriocin may be of interest as a potential natural biopreservative in the food industry, particularly in post-processed and ready-to-eat food.

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Acknowledgments

This research was supported by USDA-CSREES (Project # 2008-51110-0688).

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The authors declare no conflict of interest.

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Authors and Affiliations

  1. Food Research Lab, Department of Food Science, College of Agriculture and Life Sciences, Cornell University, 630 W North Street, Geneva, NY, 14456, USA

    Gaoyan Wang, David C. Manns, Giselle K. Guron, John. J. Churey & Randy W. Worobo

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  1. Gaoyan Wang
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  2. David C. Manns
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  3. Giselle K. Guron
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  4. John. J. Churey
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  5. Randy W. Worobo
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Correspondence to Randy W. Worobo.

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Wang, G., Manns, D.C., Guron, G.K. et al. Large-Scale Purification, Characterization, and Spore Outgrowth Inhibitory Effect of Thurincin H, a Bacteriocin Produced by Bacillus thuringiensis SF361. Probiotics & Antimicro. Prot. 6, 105–113 (2014). https://doi.org/10.1007/s12602-014-9159-1

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