Abstract
Bacteria of the genus Sulfobacillus are successfully used in biotechnologies of treatment of sulfide ore materials. However, energy processes are still poorly understood in sulfobacilli. Several enzymes encoded in the genomes of sulfobacilli are putatively involved in the initial phase of Fe2+ oxidation. Cytochromes c, sulfocyanins, and rusticyanin-like proteins were revealed in genomes of these bacteria. Thus, a membrane bound cytochrome c can be reduced directly by Fe2+, and electrons can be further transferred to sulfocyanin, rusticyanin or some other components of the transport chain. HPLC identification of prosthetic groups of cytochromes predicts the possible presence of heme c in the cells of thermotolerant sulfobacillus. Determination of metal content in the cells shows that sulfobacillus harbours higher levels of copper ions under specific conditions. This can be explained by higher expression of copper-containing proteins, including cupredoxins.
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