Increase in Fe<sup>2+</sup>-Producing Activity during Growth of<i>Acidithiobacillus ferrooxidans</i>ATCC23270 on Sulfur

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  • SUGIO Tsuyoshi
    Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University
  • TAHA Taher M.
    Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University
  • KANAO Tadayoshi
    Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University
  • TAKEUCHI Fumiaki
    Environmental Management and Safety Section, Health and Environment Center, Okayama University

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  • Increase in Fe2+-Producing Activity during Growth of Acidithiobacillus ferrooxidans ATCC23270 on Sulfur

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When Acidithiobacillus ferrooxidans ATCC23270 cells, grown for many generations on sulfur were grown in sulfur medium with and without Fe3+, the bacterium markedly increased not only in iron oxidase activity but also in Fe2+-producing sulfide:ferric ion oxidoreductase (SFORase) activity during the early log phase, and retained part of these activities during the late log phase. The activity of SFORase, which catalyzes the production of Fe2+ from Fe3+ and sulfur, of sulfur-grown cells was approximately 10–20 fold higher than that of iron-grown cells. aa3 type cytochrome c oxidase, an important component of iron oxidase in A. ferrooxidans, was partially purified from sulfur-grown cells. A. ferrooxidans ATCC23270 cells grown for many generations on sulfur had the ability to grow on iron as rapidly as that did iron-grown cells. These results suggest that both iron oxidase and Fe2+-producing SFORase have a role in the energy generation of A. ferrooxidans ATCC23270 from sulfur.

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