Reduction of Hg2+ with Reduced Mammalian Cytochrome c by Cytochrome c Oxidase Purified from a Mercury-Resistant Acidithiobacillus ferrooxidans Strain, MON-1
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概要
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Acidithiobacillus ferrooxidans AP19-3, ATCC 23270, and MON-1 are mercury-sensitive, moderately mercury-resistant, and highly mercury-resistant strains respectively. It is known that 2,3,5,6-tetramethyl-p-phenylendiamine (TMPD) and reduced cytochrome c are used as electron donors specific for cytochrome c oxidase. Resting cells of strain MON-1 had TMPD oxidase activity and volatilized metal mercury with TMPD as an electron donor. Cytochrome c oxidase purified from strain MON-1 reduced mercuric ions to metalic mercury with reduced mammalian cytochrome c as well as TMPD. These mercury volatilization activities with reduced cytochrome c and TMPD were completely inhibited by 1 mM NaCN. These results indicate that cytochrome c oxidase is involved in mercury reduction in A. ferrooxidans cells. The cytochrome c oxidase activities of strains AP19-3 and ATCC 23270 were completely inhibited by 1 μM and 5 μM of mercuric chloride respectively. In contrast, the activity of strain MON-1 was inhibited 33% by 5 μM, and 70% by 10 μM of mercuric chloride, suggesting that the levels of mercury resistance in A. ferrooxidans strains correspond well with the levels of mercury resistance of cytochrome c oxidase.
- 社団法人 日本農芸化学会の論文
著者
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Sugio Tsuyoshi
Division of Bioscience, The Graduate School of Natural Science and Technology, Okayama University
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TAKEUCHI Fumiaki
Environmental Management Center, Okayama University
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Kanao Tadayoshi
Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University
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Fujii Mitsuko
Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University
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Ninomiya Yumika
Department of Biological Function, Faculty of Agriculture, Okayama University
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NEGISHI Atsunori
Technical Research Institute, Hazama Corporation
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