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The cytochrome aa 3 -type quinol oxidase from the archaeon Acidianus ambivalens and the ba 3 -type cytochrome c oxidase from Thermus thermophilus are divergent members of the heme-copper oxidase superfamily of enzymes. In particular they lack most of the key residues involved in the proposed proton transfer pathways. The pumping capability of the A. ambivalens enzyme was investigated...
The X-ray structures of several haem-copper oxidases now at hand have given important constraints on how these enzymes function. Yet, dynamic data are required to elucidate the mechanisms of electron and proton transfer, the activation of O 2 and its reduction to water, as well as the still enigmatic mechanism by which these enzymes couple the redox reaction to proton translocation. Here,...
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