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- W2013575552 abstract "In the absence of any external electron donor, the “peroxy” intermediate of cytochrome c oxidase (CcO-607) is converted to the ferryl form (CcO-580) and subsequently to oxidized enzyme. The rate of conversion of CcO-607 to the CcO-580 form is pH dependent between pH 3.0 and pH 7.6. A plot of the logarithm of the rate constant for this conversion is a linear function of pH with a slope of −0.92, implying the involvement of a single proton in the transition. Upon rapidly lowering the pH from 8.1 to 5.8, the uptake of one proton was observed by direct pH measurement, and the kinetics of proton uptake coincide with the spectral conversion of CcO-607 to CcO-580. We interpret the slow endogenous decay of CcO-607 to CcO-580 to be the result of proton transfer to a deprotonated group generated in the binuclear cavity during CcO-607 formation. This group is not freely accessible to protons from the medium, and its pKa is probably higher than 9.0." @default.
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- W2013575552 date "2001-01-13" @default.
- W2013575552 modified "2023-09-25" @default.
- W2013575552 title "Proton Involvement in the Transition from the “Peroxy” to the Ferryl Intermediate of Cytochrome <i>c</i> Oxidase" @default.
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- W2013575552 doi "https://doi.org/10.1021/bi002373i" @default.
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