1Q90

Structure of the cytochrome b6f (plastohydroquinone : plastocyanin oxidoreductase) from Chlamydomonas reinhardtii

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
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: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1q90b_	Membrane and cell surface proteins and peptides	Heme-binding four-helical bundle	Transmembrane di-heme cytochromes	Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Cytochrome b6 subunit of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
E [auth R]	d1q90r_	Membrane and cell surface proteins and peptides	Single transmembrane helix	ISP transmembrane anchor	ISP transmembrane anchor	ISP subunit from the cytochrome b6f complex, transmembrane anchor	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
G [auth L]	d1q90l_	Membrane and cell surface proteins and peptides	Single transmembrane helix	PetL subunit of the cytochrome b6f complex	PetL subunit of the cytochrome b6f complex	PetL subunit of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
H [auth M]	d1q90m_	Membrane and cell surface proteins and peptides	Single transmembrane helix	PetM subunit of the cytochrome b6f complex	PetM subunit of the cytochrome b6f complex	PetM subunit of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
I [auth N]	d1q90n_	Membrane and cell surface proteins and peptides	Single transmembrane helix	PetN subunit of the cytochrome b6f complex	PetN subunit of the cytochrome b6f complex	PetN subunit of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
A	d1q90a1	All beta proteins	Common fold of diphtheria toxin/transcription factors/cytochrome f	Cytochrome f, large domain	Cytochrome f, large domain	Cytochrome f, large domain	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
A	d1q90a2	All beta proteins	Barrel-sandwich hybrid	Rudiment single hybrid motif	Cytochrome f, small domain	Cytochrome f, small domain	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
A	d1q90a3	Membrane and cell surface proteins and peptides	Single transmembrane helix	Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
A	d1q90a4	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
C	d1q90c_	All beta proteins	ISP domain	ISP domain	Rieske iron-sulfur protein (ISP)	ISP subunit from the cytochrome b6f complex, soluble domain	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
D	d1q90d_	Membrane and cell surface proteins and peptides	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Subunit IV of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)
F [auth G]	d1q90g_	Membrane and cell surface proteins and peptides	Single transmembrane helix	PetG subunit of the cytochrome b6f complex	PetG subunit of the cytochrome b6f complex	PetG subunit of the cytochrome b6f complex	(Chlamydomonas reinhardtii ) [TaxId: 3055 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2 Family	Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8027537	4002208	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Transmembrane di-heme cytochromes	8039916	3000517	SCOP2 (2022-06-29)
E [auth R]	SCOP2 Family	ISP transmembrane anchor	8027548	4002051	SCOP2 (2022-06-29)
E [auth R]	SCOP2 Superfamily	ISP transmembrane anchor	8039927	3000753	SCOP2 (2022-06-29)
G [auth L]	SCOP2 Family	PetL subunit of the cytochrome b6f complex	8027544	4001686	SCOP2 (2022-06-29)
G [auth L]	SCOP2 Superfamily	PetL subunit of the cytochrome b6f complex	8039923	3000253	SCOP2 (2022-06-29)
H [auth M]	SCOP2 Family	PetM subunit of the cytochrome b6f complex	8027545	4001695	SCOP2 (2022-06-29)
H [auth M]	SCOP2 Superfamily	PetM subunit of the cytochrome b6f complex	8039924	3000262	SCOP2 (2022-06-29)
I [auth N]	SCOP2 Family	PetN subunit of the cytochrome b6f complex	8027547	4001705	SCOP2 (2022-06-29)
I [auth N]	SCOP2 Superfamily	PetN subunit of the cytochrome b6f complex	8039926	3000279	SCOP2 (2022-06-29)
A	SCOP2 Family	Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	8027536	4001680	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor	8039915	3000244	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	Rudiment single hybrid motif	8043111	3001910	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	cytochrome f, large domain	8040246	3000800	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	cytochrome f, large domain	8040246	3000800	SCOP2B (2022-06-29)
C	SCOP2 Family	Rieske iron-sulfur protein (ISP)	8027538	4001667	SCOP2 (2022-06-29)
C	SCOP2 Superfamily	ISP domain	8039917	3000233	SCOP2 (2022-06-29)
D	SCOP2 Family	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8027540	4002216	SCOP2 (2022-06-29)
D	SCOP2 Superfamily	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8039919	3000966	SCOP2 (2022-06-29)
F [auth G]	SCOP2 Family	PetG subunit of the cytochrome b6f complex	8027542	4001700	SCOP2 (2022-06-29)
F [auth G]	SCOP2 Superfamily	PetG subunit of the cytochrome b6f complex	8039921	3000270	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Cytochrome_B	e1q90B1	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)
E [auth R]	CytB6-F_Fe-S	e1q90R1	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)
G [auth L]	PetL	e1q90L1	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	ECOD (1.6)
H [auth M]	PetM	e1q90M1	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)
I [auth N]	PetN	e1q90N1	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)
A	Apocytochr_F_N	e1q90A1	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)
A	Apocytochr_F_C_N	e1q90A3	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)
A	Apocytochr_F_C_C	e1q90A2	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)
C	Rieske_cytochrome_b6f	e1q90C1	A: beta sandwiches	X: ISP domain (From Topology)	H: ISP domain (From Topology)	T: ISP domain	F: Rieske_cytochrome_b6f	ECOD (1.6)
C	Rieske_4	e1q90C2	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	Cytochrom_B_C	e1q90D1	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)
F [auth G]	PetG	e1q90G1	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)
B	1.20.810.10	Mainly Alpha	Up-down Bundle	Cytochrome Bc1 Complex	Chain C	CATH (4.3.0)
A	2.60.40.830	Mainly Beta	Sandwich	Immunoglobulin-like	Cytochrome f large domain	CATH (4.3.0)
A	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	2.102.10.10	Mainly Beta	3-layer Sandwich	Rieske Iron-sulfur Protein	Rieske [2Fe-2S] iron-sulphur domain	CATH (4.3.0)
D	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)
D	1.10.287.980	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	plastocyanin oxidoreductase	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B	PF00033	Cytochrome b/b6/petB (Cytochrome_B)	Cytochrome b/b6/petB	-	Domain
G [auth L]	PF05115	Cytochrome B6-F complex subunit VI (PetL) (PetL)	Cytochrome B6-F complex subunit VI (PetL)	-	Family
I [auth N]	PF03742	PetN (PetN)	PetN	-	Family
A	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
A	PF01333	Apocytochrome F, C-terminal (Apocytochr_F_C)	Apocytochrome F, C-terminal	This is a sub-family of cytochrome C. See Pfam:PF00034.	Domain
C	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
D	PF00032	Cytochrome b(C-terminal)/b6/petD (Cytochrom_B_C)	Cytochrome b(C-terminal)/b6/petD	-	Domain
F [auth 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
B	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 electron transport chain metabolic process cellular process generation of precursor metabolites and energy photosynthesis	cellular anatomical structure membrane chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope bounding membrane of organelle membraneless organelle cellular anatomical structure membrane chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope bounding membrane of organelle membraneless organelle thylakoid plastid envelope chloroplast intracellular membraneless organelle intracellular membrane-bounded organelle thylakoid membrane organelle chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
E [auth R]	Cytochrome B6-F complex iron-sulfur subunit	oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity electron transfer 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 oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity electron transfer 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	-	chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid plastid envelope chloroplast membrane intracellular membraneless organelle intracellular membrane-bounded organelle thylakoid membrane organelle chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
G [auth L]	Cytochrome b6f complex subunit petL	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis metabolic process cellular process	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid organelle envelope bounding membrane of organelle plastid envelope chloroplast membrane intracellular membrane-bounded organelle thylakoid membrane chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
H [auth M]	Cytochrome b6f complex subunit PETM	-	-	protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid organelle envelope bounding membrane of organelle plastid envelope chloroplast membrane intracellular membrane-bounded organelle thylakoid membrane chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
I [auth N]	Cytochrome b6f complex subunit PETN	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis 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 intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid organelle envelope bounding membrane of organelle plastid envelope chloroplast membrane intracellular membrane-bounded organelle thylakoid membrane chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
A	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 metabolic process cellular process	chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid plastid envelope chloroplast membrane intracellular membraneless organelle intracellular membrane-bounded organelle thylakoid membrane organelle chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
C	Cytochrome B6-F complex iron-sulfur subunit	oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity electron transfer 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 oxidoreductase activity, acting on diphenols and related substances as donors primary active transmembrane transporter activity electron transfer 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	-	chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membraneless organelle thylakoid plastid envelope chloroplast membrane intracellular membraneless organelle intracellular membrane-bounded organelle thylakoid membrane organelle chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
D	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	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 monoatomic ion transport cellular process monoatomic cation transport aerobic respiration cellular respiration 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 monoatomic ion transport cellular process monoatomic cation transport aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation energy derivation by oxidation of organic compounds ATP synthesis coupled electron transport electron transport chain generation of precursor metabolites and energy mitochondrial electron transport, ubiquinol to cytochrome c respiratory electron transport chain metabolic process mitochondrial ATP synthesis coupled electron transport photosynthesis photosynthesis, light reaction photosynthetic electron transport chain	cellular anatomical structure membrane chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope bounding membrane of organelle membraneless organelle cellular anatomical structure membrane chloroplast thylakoid membrane membrane-bounded organelle plastid membrane intracellular anatomical structure plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid intracellular organelle organelle envelope bounding membrane of organelle membraneless organelle thylakoid plastid envelope chloroplast intracellular membraneless organelle intracellular membrane-bounded organelle thylakoid membrane organelle chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane
F [auth G]	Cytochrome b6f complex subunit petG	electron transfer activity electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity	photosynthesis 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 intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane protein-containing complex intracellular anatomical structure cytochrome complex catalytic complex intracellular membraneless organelle intracellular organelle cellular anatomical structure cytochrome b6f complex organelle membraneless organelle thylakoid chloroplast thylakoid membrane membrane-bounded organelle plastid membrane plastid organelle outer membrane plastid thylakoid membrane plastid thylakoid organelle envelope bounding membrane of organelle plastid envelope chloroplast membrane intracellular membrane-bounded organelle thylakoid membrane chloroplast thylakoid outer membrane cytoplasm photosynthetic membrane organelle membrane

InterPro: Protein Family Classification InterPro Database Homepage

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

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D, E [auth R] A, B, C, D, E [auth R], F [auth G], G [auth L], H [auth M], I [auth N]	OPM	Transmembrane	Alpha-helical polytopic	Electron transport chain complex III (bc1 and b6f) superfamily	Cytochrome bc1 and b6f complexes