ENZYME entry: EC 1.10.3.14

Accepted Name
Ubiquinol oxidase (electrogenic, non H(+)-transporting).
Alternative Name(s)
Cytochrome bd-I oxidase.
Reaction catalysed
2 ubiquinol + O(2) + 4 H(+)(Side 1) <=> 2 ubiquinone + 2 H(2)O + 4 H(+)(Side 2)
Comment(s)
  • 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 1.10.3.10.
Cross-references
BRENDA1.10.3.14
EC2PDB1.10.3.14
ExplorEnz1.10.3.14
PRIAM enzyme-specific profiles1.10.3.14
KEGG Ligand Database for Enzyme Nomenclature1.10.3.14
IUBMB Enzyme Nomenclature1.10.3.14
IntEnz1.10.3.14
MEDLINEFind literature relating to 1.10.3.14
MetaCyc1.10.3.14
UniProtKB/Swiss-Prot
P0ABK0, CYDA_ECOL6;  P0ABJ9, CYDA_ECOLI;  P0ABK1, CYDA_SHIFL;  
P0ABK4, CYDB_ECO57;  P0ABK3, CYDB_ECOL6;  P0ABK2, CYDB_ECOLI;  
Q2YKD6, CYDX_BRUA2;  P56100, CYDX_ECOLI;  

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