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Eur J Biochem. 1988 Mar 15;172(3):543-6.

The Paracoccus denitrificans cytochrome aa3 has a third subunit.

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Department of Medical Chemistry, University of Helsinki.


The presence of a third polypeptide subunit in Paracoccus cytochrome c oxidase is demonstrated. This protein (apparent molecular mass 23 kDa) binds dicyclohexylcarbodiimide in membranes of aerobically grown bacteria and in the purified enzyme. The N-terminal amino-acid sequence of this dicyclohexylcarbodiimide-binding protein is identical to the deduced sequence of the COIII gene product [Raitio et al. (1987) EMBO J. 6, 2825-2833]. We conclude that the aa3-type oxidase in Paracoccus is composed of at least three subunits, which correspond to the three mitochondrially coded polypeptides in the eukaryotic enzyme.

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