The origin of the Fe IV = O intermediates in cytochrome aa 3 oxidase
SourceBiochimica et Biophysica Acta - Bioenergetics
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The dioxygen reduction mechanism in cytochrome oxidases relies on proton control of the electron transfer events that drive the process. Proton delivery and proton channels in the protein that are relevant to substrate reduction and proton pumping are considered, and the current status of this area is summarized. We propose a mechanism in which the coupling of the oxygen reduction chemistry to proton translocation (P → F transition) is related to the properties of two groups of highly conserved residues, namely, His411/G386-T389 and the heme a 3-propionateA-D399-H403 chain. This article is part of a Special Issue entitled: Respiratory Oxidases. © 2011 Elsevier B.V. All rights reserved.
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