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  • Title: Single catalytic site model for the oxidation of ferrocytochrome c by mitochondrial cytochrome c oxidase.
    Author: Speck SH, Dye D, Margoliash E.
    Journal: Proc Natl Acad Sci U S A; 1984 Jan; 81(2):347-51. PubMed ID: 6320180.
    Abstract:
    A single catalytic site model is proposed to account for the multiphasic kinetics of oxidation of ferrocytochrome c by cytochrome c oxidase (ferrocytochrome c:oxygen oxidoreductase, EC 1.9.3.1). This model involves nonproductive binding of substrate to sites near the catalytic site on cytochrome c oxidase for cytochrome c, decreasing the binding constant for cytochrome c at the catalytic site. This substrate inhibition results in an increase in the first-order rate constant for the dissociation of the ferricytochrome c-cytochrome c oxidase complex, the rate-limiting step in the steady-state turnover of electrons between cytochrome c and cytochrome c oxidase in the spectrophotometric assay, yielding increases in the initial rate as well as the Michaelis constant--namely, multiple kinetic phases.
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