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The ba3-type cytochrome c oxidase from Thermus thermophilus is phylogenetically very distant from the aa3–type cytochrome c oxidases. Nevertheless, both types of oxidases have the same number of redox-active metal sites and the reduction of O2 to water is catalysed at a haem a3-CuB catalytic site. The three-dimensional structure of the ba3 oxidase reveals three possible proton-conducting pathways...
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