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• W2048339469 startingPage "106" @default.
• W2048339469 abstract "The interaction of solvent water protons with the bound paramagnetic metal ions of beef heart cytochrome c oxidase has been examined. The observed proton relaxation rates of enzyme solutions had a negative temperature dependence, indicating a rapid exchange between solvent protons in the coordination sphere of the metal ions and bulk solvent. An analysis of the dependence of the proton relaxation rate on the observation frequency indicated that the correlation time, which modulates the interaction between solvent protons and the unpaired electrons on the metal ions, is due to the electron spin relaxation time of the heme irons of cytochrome c oxidase. This means that at least one of the hemes is exposed to solvent. The proton relaxation rate of the oxidized enzyme was found to be sensitive to changes in ionic strength and to changes in the spin states of the metal ions. Heme a3 was found to be relatively inaccessible to bulk solvent. Partial reduction of the enzyme caused a slight increase in the relaxation rate, which may be due to a change in the antiferromagnetic coupling between two of the bound paramagnetic centers. Further reduction resulted in a decreased relaxation rate, and the fully reduced enzyme was no longer sensitive to changes in ionic strength. The binding of cytochrome c to cytochrome c oxidase had little effect on the proton relaxation rates of oxidized cytochrome oxidase indicating that cytochrome c binding has little effect on solvent accessibility to the metal ion sites." @default.
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• W2048339469 date "1983-01-01" @default.
• W2048339469 modified "2023-09-27" @default.
• W2048339469 title "Solvent proton relaxation studies of cytochrome c oxidase solutions" @default.
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• W2048339469 doi "https://doi.org/10.1016/0003-9861(83)90392-2" @default.
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• W2048339469 hasPublicationYear "1983" @default.
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