Mechanism of Tetravalent Manganese Reduction with Elemental Sulfur by Thiobacillus ferrooxidans(Microbiology & Fermentation Industry)

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概要

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• Washed intact cells of iron-grown T. ferrooxidans AP19-3 could reduce manganese dioxide (MnO_2) enzymatically with elemental sulfur (S^O) and the mechanism of Mn^<4+> reduction was studied. The optimum pH for Mn^<4+> reduction was 2.5. The amount of Mn^<4+> reduced by the strain was proportional to the amount of S^O added to the reaction mixture. An enzyme that directly catalyzes the reduction of Mn^<4+> to Mn^<2+> with S^O was not found in the cell-free extract of this strain. T. ferrooxidans AP19-3 was found to possess sulfur: ferric ion oxidoreductase (SFORase), which catalyzes the reduction of Fe^<3+> with S^O to give Fe^<2+> and sulfite. The reduction of Mn^<4+> was inhibited by a specific inhibitor of SFORase or diamide, strongly suggesting that SFORase is involved in the Mn^<4+> reduction in this strain. The involvement of SFORase in Mn^<4+> reduction was further supported by the following results. Both the amounts of Fe^<2+> and sulfite produced by SFORase were markedly reduced by MnO_2. The amount of Mn^<4+> reduced increased 5.4-fold with 1 mM ferric ion and 10-fold with 2.5 mM cyanide or an inhibitor of iron oxidase, respectively. The sulfite and Fe^<2+> were chemically oxidized by MnO_2 instantly. From the results, it is concluded that the Mn^<4+> reduction with S^O in this strain occurs through two steps. In the first step S^O is enzymatically oxidized by SFORase to give Fe^<2+> and sulfite, and in the second step these two reduced compounds are chemically reduced by MnO_2 to give Mn^<2+>

• 社団法人日本農芸化学会の論文
• 1988-01-23

著者

• Inagaki Kenji

  Division of Bioresources Science, Faculty of Agriculture, Okayama University

• Tano Tatsuo

  Division of Bioresources Science, Faculty of Agriculture, Okayama University

• Sugio Tsuyoshi

  Division of Bioscience, The Graduate School of Natural Science and Technology, Okayama University

• Tano T

  Department Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Unive

• Tano Tatsuo

  Division Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Univers

• Furutani Y

  Okayama Univ. Okayama Jpn

• Inagaki Kenji

  Dep. Of Bioresources Chemistry Graduate School Of Natural Sci. And Technol. Okayama Univ. 1-1-1 Tsus

• Sugio Tsuyoshi

  Division Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Univers

• TSUJITA Yoshihiko

  Division of Biological Function and Genetic Resources Science, Faculty of Agriculture, Okayama Unive

• HIRAYAMA Kouichi

  Division of Biological Function and Genetic Resources Science, Faculty of Agriculture, Okayama Unive

• Hirayama Kouichi

  Division Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Univers

• Tano T

  Okayama Univ. Okayama Jpn

• Inagaki Kenji

  Division Of Bioresources Science Faculty Of Agriculture Okayama University

• Tsujita Yoshihiko

  Division Of Biological Function And Genetic Resources Science Faculty Of Agriculture Okayama Univers

• Inagaki K

  Department Of Bioresources Chemistry Graduate School Of Natural Science And Technology Okayama Unive

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