Annotations: 6F0K

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F	UNK_F_TYPE	e6f0kF1	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: UNK_F_TYPE	ECOD (1.6)
E	Cytochrome_CBB3	e6f0kE1	A: alpha arrays	X: Cytochrome c-like	H: Cytochrome c (From Topology)	T: Cytochrome c	F: Cytochrome_CBB3	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
E	PF13442	Cytochrome C oxidase, cbb3-type, subunit III (Cytochrome_CBB3)	Cytochrome C oxidase, cbb3-type, subunit III		Domain
D	PF11821	Alternative complex III, ActD subunit (ActD)	Alternative complex III, ActD subunit	-	Family
C	PF03916	Polysulphide reductase, NrfD (NrfD)	Polysulphide reductase, NrfD	-	Family
B	PF13247	4Fe-4S dicluster domain (Fer4_11)	4Fe-4S dicluster domain	Superfamily includes proteins containing domains which bind to iron-sulfur clusters. Members include bacterial ferredoxins, various dehydrogenases, and various reductases. Structure of the domain is an alpha-antiparallel beta sandwich. Domain contai ...	Superfamily includes proteins containing domains which bind to iron-sulfur clusters. Members include bacterial ferredoxins, various dehydrogenases, and various reductases. Structure of the domain is an alpha-antiparallel beta sandwich. Domain contains two 4Fe4S clusters.	Domain
A	PF14522	Cytochrome c7 and related cytochrome c (Cytochrome_C7)	Cytochrome c7 and related cytochrome c	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
G [auth H]	ActH	-	-	-
F	ActF	-	-	cellular anatomical structure membrane
E	Quinol:cytochrome c oxidoreductase monoheme cytochrome subunit	binding tetrapyrrole binding heme binding electron transfer activity cation binding ion binding metal ion binding small molecule binding	-	-
D	ActD	-	-	cellular anatomical structure membrane
C	Polysulphide reductase NrfD	-	-	cell periphery cellular anatomical structure plasma membrane membrane
B	Fe-S-cluster-containing hydrogenase	-	-	-
A	Cytochrome c family protein	-	-	cellular anatomical structure membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E	IPR036909	Cytochrome c-like domain superfamily	Homologous Superfamily
E	IPR009056	Cytochrome c-like domain	Domain
D	IPR021776	Alternative complex III, ActD subunit	Family
C	IPR005614	NrfD-like	Family
B	IPR017896	4Fe-4S ferredoxin-type, iron-sulphur binding domain	Domain
B	IPR030948	TAT-variant-translocation signal domain	Domain
A	IPR029467	Cytochrome c7-like	Domain
A	IPR036280	Multiheme cytochrome superfamily	Homologous Superfamily

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, C, D, F	OPM	Transmembrane	Alpha-helical polytopic	Electron transport chain complex II superfamily	Polysulfide reductase

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, C, D, F	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, C, D, F	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, C, D, F	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Electron Transport Chain Complexes: Complex III (Cytochrome bc₁)	quinol:cytochrome c/HiPIP oxidoreductase (alternative complex III)

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.