Cytochrome c oxidase is a three-copper, two-heme-A protein.

@article{Steffens1987CytochromeCO,
  title={Cytochrome c oxidase is a three-copper, two-heme-A protein.},
  author={Gloria M. Steffens and R. Biewald and Gerhard Buse},
  journal={European journal of biochemistry},
  year={1987},
  volume={164 2},
  pages={
          295-300
        }
}
Metal contents of preparations of procaryotic (Paracoccus denitrificans) and eucaryotic (beef heart) cytochrome c oxidases have been determined by inductively coupled plasma atomic emission spectroscopy and shown to be stoichiometrically related to the protein contents. The results show that oxidases which possess subunits I and II have three copper atoms besides hemes a and a3 (Paracoccus denitrificans, Cu: 2.97 +/- 0.08 and Fe: 2.09 +/- 0.10; bovine heart, Cu: 2.83 +/- 0.07 and Fe: 1.94 +/- 0… CONTINUE READING
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