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Information on EC 7.1.1.3 - ubiquinol oxidase (H+-transporting)

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IUBMB Comments
Contains a dinuclear centre comprising two hemes, or heme and copper. This terminal oxidase enzyme generates proton motive force by two mechanisms: (1) transmembrane charge separation resulting from utilizing protons and electrons originating from opposite sides of the membrane to generate water, and (2) active pumping of protons across the membrane. The bioenergetic efficiency (the number of charges driven across the membrane per electron used to reduce oxygen to water) depends on the enzyme; for example, for the bo3 oxidase it is 2, while for the bd-II oxidase it is 1. cf. EC 1.10.3.14, ubiquinol oxidase (electrogenic, non H+-transporting).
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Word Map
  • 7.1.1.3
  • oxidases
  • heme
  • heme-copper
  • low-spin
  • binuclear
  • high-spin
  • dioxygen
  • aa3-type
  • ubiquinol-1
  • 25-hydroxyvitamin
  • vinelandii
  • azotobacter
  • soret
  • cyp27b1
  • 25-hydroxylase
  • cyanide-resistant
  • ubisemiquinone
  • flow-flash
  • quinone-binding
  • heme-heme
  • redox-coupled
  • oxoferryl
  • photodissociation
  • co-binding
  • cyanide-insensitive
  • protoheme
  • qh
  • air-oxidized
  • hqno
  • four-electron
  • ubiquinone-8
  • vitreoscilla
  • di-heme
  • alpha-band
  • co-bound
  • 25-hydroxylation
  • oxygen-reducing
  • ubiquinone-binding
  • synthesis
The enzyme appears in viruses and cellular organisms
Reaction Schemes
Synonyms
appB, AppBC, bd-type quinol oxidase, bo-type ubiquinol oxidase, CydA, CydAB, CydB, CydX, cyt bo3, Cyt-bo3, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
2 ubiquinol + O2 + n H+[side 1] = 2 ubiquinone + 2 H2O + n H+[side 2]
show the reaction diagram
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