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- W2081632067 abstract "A comparison of bovine cytochrome c oxidase isolated in the presence and the absence of chloride salts reveals that only enzyme isolated in the presence of chloride salts is a mixture of a complex of oxidized enzyme with chloride (CcO.Cl) and chloride-free enzyme (CcO). Using a spectrophotometric method for chloride determination, it was shown that CcO.Cl contains one chloride ion that is released into the medium by a single turnover or by cyanide binding. Chloride is bound slowly within the heme a(3)-Cu(B) binuclear center of oxidized enzyme in a manner similar to the binding of azide. The pH dependence of the dissociation constant for the formation of the CcO.Cl complex reveals that chloride binding proceeds with the uptake of one proton. With both forms of the enzyme the dependence of the rate of reaction for cyanide binding upon cyanide concentration asymptotes a limiting value indicating the existence of an intermediate. With CcO.Cl this limiting rate is 10(3) higher than the rate of the spontaneous dissociation of chloride from the binuclear center and we propose that the initial step is the coordination of cyanide to Cu(B) and in this intermediate state the rate of dissociation of chloride is substantially enhanced." @default.
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- W2081632067 date "2001-04-26" @default.
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- W2081632067 title "Cyanide Stimulated Dissociation of Chloride from the Catalytic Center of Oxidized Cytochrome <i>c</i> Oxidase" @default.
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- W2081632067 doi "https://doi.org/10.1021/bi010059y" @default.
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