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Cytochrome oxidase evolved by tinkering with denitrification enzymes - PubMed

  • ️Sat Jan 01 1994

Review

. 1994 Mar 14;341(1):1-4.

doi: 10.1016/0014-5793(94)80228-9.

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Review

Cytochrome oxidase evolved by tinkering with denitrification enzymes

M Saraste et al. FEBS Lett. 1994.

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Abstract

The cytochrome bc complex which is encoded by the fixNOPQ operon in Bradyrhizobium japonicum, is the most distant member of the haem-copper cytochrome oxidase family. We have found that its major subunit, FixN, is homologous to the NorB subunit of nitric oxide reductase in a purple bacterium. A second evolutionary link between cytochrome oxidases and denitrification enzymes is the presence of a similar binuclear copper site in cytochrome aa3 (the mitochondrial oxidase) and nitrous oxide reductase. This centre was probably acquired by a primitive FixN-type oxidase, leading to the evolution of the mitochondrial-type oxidase. These links suggest that the oxygen-reducing respiratory chain developed from the anaerobic, denitrifying respiratory system.

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