ID   7.1.1.3
DE   ubiquinol oxidase (H(+)-transporting).
AN   cytochrome bb3 oxidase.
AN   cytochrome bo3 oxidase.
AN   cytochrome bo oxidase.
CA   2 a ubiquinol + n H(+)(in) + O2 = 2 a ubiquinone + n H(+)(out) + 2 H2O.
CC   -!- Contains a dinuclear center comprising heme and copper.
CC   -!- This terminal oxidase enzyme generates proton motive force by two
CC       mechanisms: (1) transmembrane charge separation resulting from
CC       utilizing protons and electrons originating from opposite sides of
CC       the membrane to generate water, and (2) active pumping of protons
CC       across the membrane.
CC   -!- The bioenergetic efficiency (the number of charges driven across the
CC       membrane per electron used to reduce oxygen to water) of enzymes that
CC       have been characterized so far is 2. cf. EC 7.1.1.7.
CC   -!- Formerly EC 1.10.3.10.
DR   P26458, APPB_ECOLI ;  P26459, APPC_ECOLI ;  P57543, CYOB_BUCAI ;
DR   Q8K994, CYOB_BUCAP ;  Q89AA4, CYOB_BUCBP ;  P0ABJ0, CYOB_ECO57 ;
DR   P0ABI9, CYOB_ECOL6 ;  P0ABI8, CYOB_ECOLI ;  Q9I426, CYOB_PSEAE ;
DR   Q9WWR2, CYOB_PSEPU ;
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