Annotations: 8B4O

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth B]	F_UNCLASSIFIED	e8b4oB2	A: alpha bundles	X: Transmembrane heme-binding four-helical bundle (From Homology)	H: Transmembrane heme-binding four-helical bundle	T: Transmembrane di-heme cytochromes	F: F_UNCLASSIFIED	ECOD (1.6)
A [auth B]	Cyt_bd_oxida_II_1st	e8b4oB1	A: alpha bundles	X: Transmembrane heme-binding four-helical bundle (From Homology)	H: Transmembrane heme-binding four-helical bundle	T: Transmembrane di-heme cytochromes	F: Cyt_bd_oxida_II_1st	ECOD (1.6)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth A]	Cytochrome BD ubiquinol oxidase subunit I	oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor oxidoreductase activity oxidoreductase activity, acting on diphenols and related substances as donors catalytic activity binding tetrapyrrole binding heme binding electron transfer activity cation binding ion binding metal ion binding small molecule binding	aerobic electron transport chain aerobic respiration cellular respiration oxidative phosphorylation energy derivation by oxidation of organic compounds respiratory electron transport chain electron transport chain metabolic process cellular process generation of precursor metabolites and energy	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex cytochrome complex catalytic complex
A [auth B]	Cytochrome bd-type quinol oxidase subunit II	-	-	-