Annotations: 7N9Z

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth F]	SCOP2B Superfamily	Cytochrome c oxidase subunit I-like	8037811	3000653	SCOP2B (2022-06-29)
B [auth G]	SCOP2B Superfamily	Cytochrome c oxidase subunit II-like transmembrane region	8037812	3000692	SCOP2B (2022-06-29)
B [auth G]	SCOP2B Superfamily	Cupredoxins	8040569	3000886	SCOP2B (2022-06-29)
C [auth H]	SCOP2B Superfamily	Cytochrome c oxidase subunit III-like	8037814	3000671	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth F]	PF00115	e7n9zF1	A: alpha superhelices	X: Cytochrome c oxidase subunit I-like	H: Cytochrome c oxidase subunit I-like (From Topology)	T: Cytochrome c oxidase subunit I-like	F: PF00115	ECOD (1.6)
B [auth G]	PF00116,PF06481	e7n9zG1	A: beta sandwiches	X: Cupredoxin-like	H: Cupredoxin-related (From Topology)	T: Cupredoxin-related	F: PF00116,PF06481	ECOD (1.6)
B [auth G]	F_UNCLASSIFIED	e7n9zG2	A: extended segments	X: Cytochrome c oxidase subunit II-like, transmembrane region (From Topology)	H: Cytochrome c oxidase subunit II-like, transmembrane region (From Topology)	T: Cytochrome c oxidase subunit II-like, transmembrane region	F: F_UNCLASSIFIED	ECOD (1.6)
C [auth H]	PF00510	e7n9zH1	A: alpha bundles	X: Cytochrome c oxidase subunit III-like (From Topology)	H: Cytochrome c oxidase subunit III-like (From Topology)	T: Cytochrome c oxidase subunit III-like	F: PF00510	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth F]	PF00115	Cytochrome C and Quinol oxidase polypeptide I (COX1)	Cytochrome C and Quinol oxidase polypeptide I	-	Family
B [auth G]	PF00116	Cytochrome C oxidase subunit II, periplasmic domain (COX2)	Cytochrome C oxidase subunit II, periplasmic domain	-	Domain
B [auth G]	PF06481	COX Aromatic Rich Motif (COX_ARM)	COX Aromatic Rich Motif	-	Motif
C [auth H]	PF00510	Cytochrome c oxidase subunit III (COX3)	Cytochrome c oxidase subunit III	-	Family
D [auth I]	PF03626	Prokaryotic Cytochrome C oxidase subunit IV (COX4_pro)	Prokaryotic Cytochrome C oxidase subunit IV	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth F]	Cytochrome o ubiquinol oxidase, subunit I	oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity catalytic activity binding organic cyclic compound binding tetrapyrrole binding heme binding quinone binding ubiquinone binding small molecule binding cation binding transition metal ion binding copper ion binding ion binding metal ion binding oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor oxidoreductase activity, acting on diphenols and related substances as donors cytochrome bo3 ubiquinol oxidase activity	electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport aerobic respiration cellular respiration energy derivation by oxidation of organic compounds cellular metabolic process metabolic process generation of precursor metabolites and energy aerobic electron transport chain oxidative phosphorylation electron transport chain respiratory electron transport chain	membrane respirasome cellular anatomical entity protein-containing complex catalytic complex cytochrome complex transmembrane transporter complex cytochrome o ubiquinol oxidase complex membrane protein complex oxidoreductase complex transporter complex cell periphery plasma membrane
B [auth G]	Ubiquinol oxidase subunit 2	oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity catalytic activity cation binding transition metal ion binding copper ion binding ion binding binding metal ion binding small molecule binding oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor oxidoreductase activity, acting on diphenols and related substances as donors cytochrome bo3 ubiquinol oxidase activity	electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport aerobic respiration cellular respiration energy derivation by oxidation of organic compounds cellular metabolic process metabolic process generation of precursor metabolites and energy aerobic electron transport chain oxidative phosphorylation electron transport chain respiratory electron transport chain ATP synthesis coupled electron transport	membrane respirasome cellular anatomical entity protein-containing complex catalytic complex cytochrome complex transmembrane transporter complex cytochrome o ubiquinol oxidase complex membrane protein complex oxidoreductase complex transporter complex cell periphery plasma membrane
C [auth H]	Cytochrome o ubiquinol oxidase	oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity cytochrome-c oxidase activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreductase activity inorganic molecular entity transmembrane transporter activity oxidoreductase activity, acting on a heme group of donors inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity catalytic activity cytochrome bo3 ubiquinol oxidase activity	electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport cellular process monoatomic cation transport aerobic respiration cellular respiration energy derivation by oxidation of organic compounds cellular metabolic process metabolic process generation of precursor metabolites and energy aerobic electron transport chain oxidative phosphorylation electron transport chain respiratory electron transport chain	protein-containing complex catalytic complex cytochrome complex transmembrane transporter complex cytochrome o ubiquinol oxidase complex membrane membrane protein complex oxidoreductase complex cellular anatomical entity transporter complex cell periphery plasma membrane
D [auth I]	Cytochrome o ubiquinol oxidase, subunit IV	oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity electron transfer activity oxidoreductase activity cytochrome bo3 ubiquinol oxidase activity oxidoreductase activity, acting on a heme group of donors oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity primary active transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity electron transfer activity oxidoreductase activity cytochrome bo3 ubiquinol oxidase activity oxidoreductase activity, acting on a heme group of donors catalytic activity	aerobic electron transport chain aerobic respiration cellular respiration oxidative phosphorylation energy derivation by oxidation of organic compounds cellular metabolic process electron transport chain generation of precursor metabolites and energy respiratory electron transport chain metabolic process cellular process electron transport coupled proton transport transport proton transmembrane transport aerobic electron transport chain aerobic respiration cellular respiration oxidative phosphorylation energy derivation by oxidation of organic compounds cellular metabolic process electron transport chain generation of precursor metabolites and energy respiratory electron transport chain metabolic process cellular process electron transport coupled proton transport transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization energy coupled proton transmembrane transport, against electrochemical gradient monoatomic ion transport monoatomic cation transport	protein-containing complex catalytic complex cytochrome complex transmembrane transporter complex cytochrome o ubiquinol oxidase complex membrane membrane protein complex oxidoreductase complex cellular anatomical entity transporter complex cell periphery plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth F]	IPR036927	Cytochrome c oxidase-like, subunit I superfamily	Homologous Superfamily
A [auth F]	IPR000883	Cytochrome c oxidase subunit I	Family
A [auth F]	IPR023615	Cytochrome c oxidase, subunit I, copper-binding site	Binding Site
A [auth F]	IPR023616	Cytochrome c oxidase-like, subunit I domain	Domain
A [auth F]	IPR014207	Cytochrome o ubiquinol oxidase, subunit I	Family
B [auth G]	IPR006333	Cytochrome o ubiquinol oxidase subunit II	Family
B [auth G]	IPR011759	Cytochrome C oxidase subunit II, transmembrane domain	Domain
B [auth G]	IPR036257	Cytochrome C oxidase subunit II, transmembrane domain superfamily	Homologous Superfamily
B [auth G]	IPR045187	Cytochrome c/quinol oxidase subunit II	Family
B [auth G]	IPR034227	Ubiquinol oxidase subunit 2, cupredoxin domain	Domain
B [auth G]	IPR002429	Cytochrome c oxidase subunit II-like C-terminal	Domain
B [auth G]	IPR008972	Cupredoxin	Homologous Superfamily
B [auth G]	IPR010514	COX aromatic rich motif	Domain
C [auth H]	IPR035973	Cytochrome c oxidase subunit III-like superfamily	Homologous Superfamily
C [auth H]	IPR000298	Cytochrome c oxidase subunit III-like	Domain
C [auth H]	IPR013833	Cytochrome c oxidase, subunit III, 4-helical bundle	Homologous Superfamily
C [auth H]	IPR014206	Cytochrome o ubiquinol oxidase, subunit III	Family
C [auth H]	IPR024791	Cytochrome c oxidase subunit III	Family
C [auth H]	IPR033946	Ubiquinol oxidase subunit III domain	Domain
D [auth I]	IPR014210	Cytochrome o ubiquinol oxidase subunit IV	Family
D [auth I]	IPR005171	Cytochrome C oxidase subunit IV, prokaryotes	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A [auth F], B [auth G], C [auth H], D [auth I]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A [auth F], B [auth G], C [auth H], D [auth I]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth F], B [auth G], C [auth H], D [auth I]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Electron Transport Chain Complexes: Complex IV (Cytochrome C Oxidase)	Ubiquinol Oxidase, cytochrome bo₃ in native membrane