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pubmed-article:2159336pubmed:abstractTextThe reaction of dioxygen with mixed-valence cytochrome c oxidase was followed in a rapid-mixing continuous-flow apparatus. The optical absorption difference spectrum and a kinetic analysis confirm the presence of the primary oxygen intermediate in the 0-100-microseconds time window. The resonance Raman spectrum of the iron-dioxygen stretching mode (568 cm-1) supplies evidence that the degree of electron transfer from the iron atom to the dioxygen is similar to that in oxy complexes of other heme proteins. Thus, the Fe-O2 bond does not display any unique structural features that could account for the rapid reduction of dioxygen to water. Furthermore, the frequency of the iron-dioxygen stretching mode is the same as that of the primary intermediate in the fully reduced enzyme, indicating that the oxidation state of cytochrome a plays no role in controlling the initial properties of the oxygen binding site.lld:pubmed
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pubmed-article:2159336pubmed:authorpubmed-author:RousseauD LDLlld:pubmed
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pubmed-article:2159336pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:2159336pubmed:year1990lld:pubmed
pubmed-article:2159336pubmed:articleTitlePrimary intermediate in the reaction of mixed-valence cytochrome c oxidase with oxygen.lld:pubmed
pubmed-article:2159336pubmed:affiliationAT&T Bell Laboratories, Murray Hill, New Jersey 07974.lld:pubmed
pubmed-article:2159336pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2159336pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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