4H44

2.70 A Cytochrome b6f Complex Structure From Nostoc PCC 7120

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Transmembrane di-heme cytochromes	8083550	3000517	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8078665	3000966	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	PetM subunit of the cytochrome b6f complex	8083554	3000262	SCOP2B (2022-06-29)
H	SCOP2B Superfamily	PetN subunit of the cytochrome b6f complex	8076381	3000279	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Rudiment single hybrid motif	8032341	3001910	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	cytochrome f, large domain	8032340	3000800	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	cytochrome f, large domain	8032340	3000800	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	Cytochrome_B	e4h44A1	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: Cytochrome_B	ECOD (1.6)
B	Cytochrom_B_C	e4h44B1	A: alpha bundles	X: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) (From Topology)	H: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) (From Topology)	T: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	F: Cytochrom_B_C	ECOD (1.6)
D	Rieske_cytochrome_b6f	e4h44D5	A: beta sandwiches	X: ISP domain (From Topology)	H: ISP domain (From Topology)	T: ISP domain	F: Rieske_cytochrome_b6f	ECOD (1.6)
D	Rieske_4	e4h44D4	A: few secondary structure elements	X: Trm112p-like (From Topology)	H: Trm112p-like (From Topology)	T: Trm112p-like	F: Rieske_4	ECOD (1.6)
D	CytB6-F_Fe-S	e4h44D2	A: extended segments	X: iron-sulfur subunit (ISP) transmembrane anchor (From Topology)	H: iron-sulfur subunit (ISP) transmembrane anchor (From Topology)	T: iron-sulfur subunit (ISP) transmembrane anchor	F: CytB6-F_Fe-S	ECOD (1.6)
F	PetM	e4h44F1	A: extended segments	X: PetM subunit of the cytochrome b6f complex (From Topology)	H: PetM subunit of the cytochrome b6f complex (From Topology)	T: PetM subunit of the cytochrome b6f complex	F: PetM	ECOD (1.6)
H	PetN	e4h44H1	A: extended segments	X: PetN subunit of the cytochrome b6f complex (From Topology)	H: PetN subunit of the cytochrome b6f complex (From Topology)	T: PetN subunit of the cytochrome b6f complex	F: PetN	ECOD (1.6)
C	Apocytochr_F_N	e4h44C4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Common fold of diphtheria toxin/transcription factors/cytochrome f	F: Apocytochr_F_N	ECOD (1.6)
C	Apocytochr_F_C_N	e4h44C3	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: Apocytochr_F_C_N	ECOD (1.6)
C	Apocytochr_F_C_C	e4h44C2	A: extended segments	X: Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor (From Topology)	H: Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor (From Topology)	T: Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	F: Apocytochr_F_C_C	ECOD (1.6)
E	PetL_1	e4h44E1	A: extended segments	X: PetL subunit of the cytochrome b6f complex (From Topology)	H: PetL subunit of the cytochrome b6f complex (From Topology)	T: PetL subunit of the cytochrome b6f complex	F: PetL_1	ECOD (1.6)
G	PetG	e4h44G1	A: extended segments	X: PetG subunit of the cytochrome b6f complex (From Topology)	H: PetG subunit of the cytochrome b6f complex (From Topology)	T: PetG subunit of the cytochrome b6f complex	F: PetG	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.810.10	Mainly Alpha	Up-down Bundle	Cytochrome Bc1 Complex	Chain C	CATH (4.3.0)
B	1.20.5.510	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Single helix bin	CATH (4.3.0)
B	1.10.287.980	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	plastocyanin oxidoreductase	CATH (4.3.0)
D	1.20.5.700	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Single helix bin	CATH (4.3.0)
D	2.102.10.10	Mainly Beta	3-layer Sandwich	Rieske Iron-sulfur Protein	Rieske [2Fe-2S] iron-sulphur domain	CATH (4.3.0)
C	2.60.40.830	Mainly Beta	Sandwich	Immunoglobulin-like	Cytochrome f large domain	CATH (4.3.0)
C	2.40.50.100	Mainly Beta	Beta Barrel	OB fold (Dihydrolipoamide Acetyltransferase, E2P)	RNA polymerase II/Efflux pump adaptor protein, barrel-sandwich hybrid domain	CATH (4.3.0)
C	1.20.5.700	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Single helix bin	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00033	Cytochrome b/b6/petB (Cytochrome_B)	Cytochrome b/b6/petB	-	Domain
B	PF00032	Cytochrome b(C-terminal)/b6/petD (Cytochrom_B_C)	Cytochrome b(C-terminal)/b6/petD	-	Domain
D	PF00355	Rieske [2Fe-2S] domain (Rieske)	Rieske [2Fe-2S] domain	The rieske domain has a [2Fe-2S] centre. Two conserved cysteines coordinate one Fe ion, while the other Fe ion is coordinated by two conserved histidines. In hyperthermophilic archaea there is a SKTPCX(2-3)C motif at the C-terminus. The cysteines in ...	The rieske domain has a [2Fe-2S] centre. Two conserved cysteines coordinate one Fe ion, while the other Fe ion is coordinated by two conserved histidines. In hyperthermophilic archaea there is a SKTPCX(2-3)C motif at the C-terminus. The cysteines in this motif form a disulphide bridge, which stabilises the protein [4].	Domain
F	PF08041	PetM family of cytochrome b6f complex subunit 7 (PetM)	PetM family of cytochrome b6f complex subunit 7	-	Family
H	PF03742	PetN (PetN)	PetN	-	Family
C	PF16639	Apocytochrome F, N-terminal (Apocytochr_F_N)	Apocytochrome F, N-terminal	This is the N-terminal domain of cytochrome f. It is a soluble lumen-side domain [1].	Domain
C	PF01333	Apocytochrome F, C-terminal (Apocytochr_F_C)	Apocytochrome F, C-terminal	This is a sub-family of cytochrome C. See Pfam:PF00034.	Domain
E	PF05115	Cytochrome B6-F complex subunit VI (PetL) (PetL)	Cytochrome B6-F complex subunit VI (PetL)	-	Family
G	PF02529	Cytochrome B6-F complex subunit 5 (PetG)	Cytochrome B6-F complex subunit 5	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Cytochrome b6	oxidoreductase activity catalytic activity electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity cation binding ion binding binding metal ion binding small molecule binding	cellular respiration energy derivation by oxidation of organic compounds respiratory electron transport chain cellular metabolic process electron transport chain metabolic process cellular process generation of precursor metabolites and energy photosynthesis	intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane thylakoid non-membrane-bounded organelle
B	Cytochrome b6-f complex subunit 4	oxidoreductase activity catalytic activity electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain cellular metabolic process electron transport chain metabolic process cellular process generation of precursor metabolites and energy	intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane thylakoid non-membrane-bounded organelle
D	Cytochrome b6-f complex iron-sulfur subunit 1	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity oxidoreductase activity plastoquinol--plastocyanin reductase activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity oxidoreductase activity, acting on diphenols and related substances as donors, with copper protein as acceptor transporter activity transmembrane transporter activity catalytic activity iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity oxidoreductase activity plastoquinol--plastocyanin reductase activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity oxidoreductase activity, acting on diphenols and related substances as donors, with copper protein as acceptor transporter activity transmembrane transporter activity catalytic activity iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding binding metal cluster binding small molecule binding cation binding ion binding metal ion binding	photosynthesis cellular metabolic process metabolic process cellular process	intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane thylakoid non-membrane-bounded organelle
F	Cytochrome b6-f complex subunit 7	electron transfer activity	photosynthesis cellular metabolic process metabolic process cellular process	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane
H	Cytochrome b6-f complex subunit 8	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis cellular metabolic process metabolic process cellular process cytochrome complex assembly cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular component organization or biogenesis	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane
C	Apocytochrome f	binding organic cyclic compound binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding	photosynthesis cellular metabolic process metabolic process cellular process	intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore cellular anatomical entity thylakoid membrane intracellular organelle cell periphery plasma membrane-derived thylakoid membrane organelle intracellular non-membrane-bounded organelle plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane thylakoid non-membrane-bounded organelle
E	Cytochrome b6-f complex subunit 6	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis cellular metabolic process metabolic process cellular process	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane
G	Cytochrome b6-f complex subunit 5	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis cellular metabolic process metabolic process cellular process cytochrome complex assembly cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular component organization or biogenesis	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex cellular anatomical entity intracellular organelle cytochrome b6f complex organelle intracellular non-membrane-bounded organelle thylakoid non-membrane-bounded organelle plasma membrane-derived chromatophore membrane membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR027387	Cytochrome b/b6-like domain superfamily	Homologous Superfamily
A	IPR016174	Di-haem cytochrome, transmembrane	Homologous Superfamily
A	IPR023530	Cytochrome b6, PetB	Family
A	IPR048259	Cytochrome b/b6, N-terminal domain, eukaryotic/bacterial	Domain
A	IPR005797	Cytochrome b/b6, N-terminal domain	Domain
B	IPR036150	Cytochrome b/b6, C-terminal domain superfamily	Homologous Superfamily
B	IPR005798	Cytochrome b/b6, C-terminal	Domain
B	IPR005870	Cytochrome b6/f complex, subunit IV	Family
B	IPR048260	Cytochrome b/b6, C-terminal domain, eukaryotic/bacterial	Domain
D	IPR017941	Rieske [2Fe-2S] iron-sulphur domain	Domain
D	IPR005805	Rieske iron-sulphur protein, C-terminal	Domain
D	IPR036922	Rieske [2Fe-2S] iron-sulphur domain superfamily	Homologous Superfamily
D	IPR023960	Cytochrome b6-f complex iron-sulfur subunit	Family
D	IPR014349	Rieske iron-sulphur protein	Family
F	IPR012595	PetM of cytochrome b6/f complex subunit 7	Family
H	IPR036143	Cytochrome b6-f complex, subunit 8 superfamily	Homologous Superfamily
H	IPR005497	Cytochrome b6-f complex, subunit 8	Family
C	IPR002325	Cytochrome f	Family
C	IPR011054	Rudiment single hybrid motif	Homologous Superfamily
C	IPR036826	Cytochrome f large domain superfamily	Homologous Superfamily
C	IPR024058	Cytochrome f transmembrane anchor	Homologous Superfamily
C	IPR024094	Cytochrome f large domain	Domain
E	IPR007802	Cytochrome b6-f complex subunit 6	Family
G	IPR003683	Cytochrome b6/f complex, subunit 5	Family
G	IPR036099	Cytochrome b6/f complex, subunit 5 superfamily	Homologous Superfamily

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F, G, H	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F, G, H	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D, E A, B, C, D, E, F, G, H	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Electron Transport Chain Complexes: Cytochrome b₆f of Oxygenic Photosynthesis	Cytochrome b₆f complex