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A novel enzyme-based antimicrobial system comprising iodide and a multicopper oxidase isolated from Alphaproteobacterium strain Q-1

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Abstract

Alphaproteobacterium strain Q-1 produces an extracellular multicopper oxidase (IOX), which catalyzes iodide (I) oxidation to form molecular iodine (I2). In this study, the antimicrobial activity of the IOX/iodide system was determined. Both Gram-positive and Gram-negative bacteria tested were killed completely within 5 min by 50 mU mL–1 of IOX and 10 mM iodide. The sporicidal activity of the system was also tested and compared with a common iodophor, povidone-iodine (PVP-I). IOX (300 mU mL–1) killed Bacillus cereus, B. subtilis, and Geobacillus stearothermophilus spores with decimal reduction times of 2.58, 7.62, and 40.9 min, respectively. However, 0.1 % PVP-I killed these spores with much longer decimal reduction times of 5.46, 38.0, and 260 min, respectively. To evaluate the more superior sporicidal activity of the IOX system over PVP-I, the amount of free iodine (non-complexed I2) was determined by an equilibrium dialysis technique. The IOX system included more than 40 mg L–1 of free iodine, while PVP-I included at most 25 mg L–1 free iodine. Our results suggest that the new enzyme-based antimicrobial system is effective against a wide variety of microorganisms and bacterial spores, and that its strong biocidal activity is due to its high free iodine content, which is probably maintained by re-oxidation of iodide released after oxidation of cell components by I2.

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Funding

This work was partially supported by grants from the Japan Foundation for Applied Enzymology, JSPS KAKENHI (20780049), and the Institute of Fermentation, Osaka, Japan, to S. A.

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The authors confirm that they have no conflict of interests.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Correspondence to Seigo Amachi.

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Yuliana, T., Ebihara, K., Suzuki, M. et al. A novel enzyme-based antimicrobial system comprising iodide and a multicopper oxidase isolated from Alphaproteobacterium strain Q-1. Appl Microbiol Biotechnol 99, 10011–10018 (2015). https://doi.org/10.1007/s00253-015-6862-0

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  • DOI: https://doi.org/10.1007/s00253-015-6862-0

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