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  • Title: The oxygen dependency of the redox state of heme and copper in cytochrome oxidase in vitro.
    Author: Hoshi Y, Hazeki O, Tamura M.
    Journal: Adv Exp Med Biol; 1989; 248():71-6. PubMed ID: 2551141.
    Abstract:
    The oxidation-reduction state of cytochrome oxidase in isolated mitochondria at low oxygen concentrations was measured by the use of leghemoglobin as an oxygen indicator. P50 a + a3 varied with energy state as well as the respiratory rate. In contrast to heme a + a3, copper was slower to reduce than heme a + a3. The P50Cu of 8 x 10(-8)M in State 4 and 7.4 x 10(-8)M in State 3 was independent of both the energy state and the respiratory rate.
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