Thiobacillus ferrooxidansのエネルギー源選択性と元素硫黄代謝機構

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The growth and the activities of energy-acquiring enzymes of Thiobacillus ferrooxidans, one of the more common iron-oxidizing bacteira having the capacity to oxidize elemental sulfur as well as ferrous iron, were investigated with mixed-substrate medium. Highlights of this study are as follows : 1. Addition of elemental sulfur resulted in delays of the iron oxidation as well as the cell growth.2. On the mixed-substrate medium ferrous iron was preferentially utilized.3. Elemental sulfur was well oxidized after complete oxidation of the ferrous iron, but a gradual oxidation of sulfur had occurred during the iron oxidation.4. Ferrous iron migth induce the synthesis of iron oxidase and repress thiosulfate-oxidizing enzyme while it didn't inhibit rhodanese or AMP-independent sulfite oxidase.5. Diauxic growth ont he mixed-substrate medium might be caused by the conversion of energy metabolism.6. A main pathway was proposed in the elemental sulfur metabolism of T. ferrooxidans : S^0→SO_3^<2->→SO_4^<2->
社団法人日本生物工学会の論文
1981-05-25