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Substance Name: Oxidase, cytochrome
RN: 9001-16-5


  • A multisubunit enzyme complex containing CYTOCHROME A GROUP; CYTOCHROME A3; two copper atoms; and 13 different protein subunits. It is the terminal oxidase complex of the RESPIRATORY CHAIN and collects electrons that are transferred from the reduced CYTOCHROME C GROUP and donates them to molecular OXYGEN, which is then reduced to water. The redox reaction is simultaneously coupled to the transport of PROTONS across the inner mitochondrial membrane.
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Names and Synonyms

MeSH Heading

  • Electron Transport Complex IV


  • EINECS 232-586-0

Systematic Name

  • Oxidase, cytochrome

Registry Numbers

CAS Registry Number

  • 9001-16-5

System Generated Number

  • 0009001165