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Sulfur Dioxygenase

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Sulfur Dioxygenase

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    1. Sulfur Dioxygenase Vidu Yarlagadda

    2. Acidithiobacillus ferrooxidans Meso-acidophile Uses S2-, S2O32-, S, and Fe2+ as electron donors S2- ? SO42- S2O32- ? SO42- S ? SO42- Fe2+ ? Fe3+

    3. Glutathione Mechanism for converting elemental sulfur into –SH is glutathione dependent in in vitro

    9. Energy Loss While oxidation of elemental sulfur to sulfate is very exothermic, this energy is not efficiently utilized since oxygen is directly coordinated to the sulfur atoms (and not done in a stepwise manner)

    10. Sulfur Dioxygenase 46 kDa Interestingly, none of the usual cofactors in redox (i.e. cytochromes, flavins, etc.) seem to be used in this process

    11. Anaerobic Sulfur Oxidation Acidithiobacillus is an obligate aerobe However, it seems to be able to oxidize sulfur anaerobically as well Here cofactor comes into place As elemental sulfur is oxidized to sulfite and then sulfate, Fe3+ is reduced to Fe2+ Experimental results suggest that for every 6 mol of Fe3+ consumed, 1 mol of SO42- is produced

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