Sulfite Oxidation Catalyzed by aa_3-Type Cytochrome c Oxidase in Acidithiobacillus ferrooxidans
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概要
- 論文の詳細を見る
Sulfite is produced as a toxic intermediate during Acidithiobacillus ferrooxidans sulfur oxidation. A. ferrooxidans D3-2, which posseses the highest copper bioleaching activity, is more resistant to sulfite than other A. ferrooxidans strains, including ATCC 23270. When sulfite oxidase was purified homogeneously from strain D3-2, the oxidized and reduced forms of the purified sulfite oxidase absorption spectra corresponded to those of A. ferrooxidans aa3-type cytochrome c oxidase. The confirmed molecular weights of the α-subunit (52.5 kDa), the β-subunit (25 kDa), and the γ-subunit (20 kDa) of the purified sulfite oxidase and the N-terminal amino acid sequences of the γ-subunit of sulfite oxidase (AAKKG) corresponded to those of A. ferrooxidans ATCC 23270 cytochrome c oxidase. The sulfite oxidase activities of the iron- and sulfur-grown A. ferrooxidans D3-2 were much higher than those cytochrome c oxidases purified from A. ferrooxidans strains ATCC 23270, MON-1 and AP19-3. The activities of sulfite oxidase purified from iron- and sulfur-grown strain D3-2 were completely inhibited by an antibody raised against a purified A. ferrooxidans MON-1 aa3-type cytochrome c oxidase. This is the first report to indicate that aa3-type cytochrome c oxidase catalyzed sulfite oxidation in A. ferrooxidans.
- 社団法人 日本農芸化学会の論文
- 2010-11-23
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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Sugio Tsuyoshi
Division Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Univers
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Takeuchi Fumiaki
Environmental Management Center Okayama Univ.
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AKO Ami
Faculty of Agriculture, Okayama University
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Ako Ami
Faculty Of Agriculture Okayama University
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TAKEUCHI Fumiaki
Environmental Management and Safety Section, Health and Environment Center, Okayama University
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