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

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 kille...

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Veröffentlicht in:Applied microbiology and biotechnology 2015-12, Vol.99 (23), p.10011-10018
Hauptverfasser: Yuliana, Tri, Ebihara, Kyota, Suzuki, Mio, Shimonaka, Chie, Amachi, Seigo
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container_issue 23
container_start_page 10011
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creator Yuliana, Tri
Ebihara, Kyota
Suzuki, Mio
Shimonaka, Chie
Amachi, Seigo
description 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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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.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>26254787</pmid><doi>10.1007/s00253-015-6862-0</doi><tpages>8</tpages></addata></record>
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1432-0614
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subjects Alphaproteobacteria - enzymology
Alphaproteobacteria - metabolism
Analysis
Anti-Bacterial Agents - isolation & purification
Anti-Bacterial Agents - metabolism
Anti-Bacterial Agents - pharmacology
anti-infective properties
Antimicrobial agents
Bacillus cereus
Bacteria
bacterial spores
Biomedical and Life Sciences
Biotechnologically Relevant Enzymes and Proteins
Biotechnology
Cellular biology
Dialysis
Disinfection & disinfectants
E coli
Enzymes
Geobacillus
Geobacillus stearothermophilus
Gram-negative bacteria
Gram-Negative Bacteria - drug effects
Gram-Negative Bacteria - physiology
Gram-Positive Bacteria - drug effects
Gram-Positive Bacteria - physiology
Hydrogen peroxide
Iodides
Iodides - pharmacology
Iodine
Life Sciences
Microbial Genetics and Genomics
Microbial Viability - drug effects
Microbiology
Microorganisms
Oxidation
Oxidoreductases - isolation & purification
Oxidoreductases - metabolism
Oxidoreductases - pharmacology
PVP
Spores, Bacterial - drug effects
Studies
Time Factors
title novel enzyme-based antimicrobial system comprising iodide and a multicopper oxidase isolated from Alphaproteobacterium strain Q-1
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