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ENZYME entry: EC

Accepted Name
Ubiquinol oxidase (electrogenic, non H(+)-transporting).
Alternative Name(s)
Cytochrome bd-I oxidase.
Reaction catalysed
2 ubiquinol + O(2)(Side 2) + 4 H(+)(Side 2) <=> 2 ubiquinone + 2 H(2)O(Side 2) + 4 H(+)(Side 1)
  • This terminal oxidase enzyme is unable to pump protons but generates a proton motive force by transmembrane charge separation resulting from utilizing protons and electrons originating from opposite sides of the membrane to generate water.
  • The bioenergetic efficiency (the number of charges driven across the membrane per electron used to reduce oxygen to water) is 1.
  • The bd-I oxidase from the bacterium Escherichia coli is the predominant respiratory oxygen reductase that functions under microaerophilic conditions in that organism.
  • Cf. EC
PRIAM enzyme-specific profiles1.10.3.14
KEGG Ligand Database for Enzyme Nomenclature1.10.3.14
IUBMB Enzyme Nomenclature1.10.3.14
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