2IBZ | pdb_00002ibz

Yeast Cytochrome BC1 Complex with Stigmatellin

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
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: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
I	d2ibzi_	Membrane and cell surface proteins and peptides	Single transmembrane helix	Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	automated matches	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
H [auth G]	d2ibzg_	Membrane and cell surface proteins and peptides	Single transmembrane helix	Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
G [auth F]	d2ibzf_	Membrane and cell surface proteins and peptides	14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	automated matches	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
F [auth H]	d2ibzh_	Membrane and cell surface proteins and peptides	Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
E	d2ibze1	All beta proteins	ISP domain	ISP domain	Rieske iron-sulfur protein (ISP)	ISP subunit of the mitochondrial cytochrome bc1-complex, water-soluble domain	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
E	d2ibze2	Membrane and cell surface proteins and peptides	Single transmembrane helix	ISP transmembrane anchor	ISP transmembrane anchor	Iron-sulfur subunit (ISP) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane region	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
D	d2ibzd1	All alpha proteins	Cytochrome c	Cytochrome c	Cytochrome bc1 domain	Cytochrome bc1 domain	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
D	d2ibzd2	Membrane and cell surface proteins and peptides	Single transmembrane helix	Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor	Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor	Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
C	d2ibzc2	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)	Mitochondrial cytochrome b subunit, N-terminal domain	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
C	d2ibzc1	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)	Mitochondrial cytochrome b subunit, C-terminal domain	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
B	d2ibzb1	Alpha and beta proteins (a+b)	LuxS/MPP-like metallohydrolase	LuxS/MPP-like metallohydrolase	MPP-like	Cytochrome bc1 core subunit 2	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
K [auth Y]	d2ibzy_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoglobulin light chain kappa variable domain, VL-kappa	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
J [auth X]	d2ibzx_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoglobulin heavy chain variable domain, VH	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d2ibza1	Alpha and beta proteins (a+b)	LuxS/MPP-like metallohydrolase	LuxS/MPP-like metallohydrolase	MPP-like	Cytochrome bc1 core subunit 1	(Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
I	SCOP2B Superfamily	Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8040319	3000779	SCOP2B (2022-06-29)
H [auth G]	SCOP2B Superfamily	Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8040318	3000770	SCOP2B (2022-06-29)
G [auth F]	SCOP2B Superfamily	14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8040315	3000797	SCOP2B (2022-06-29)
F [auth H]	SCOP2B Superfamily	Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8040312	3000806	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	ISP domain	8040307	3000233	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	ISP transmembrane anchor	8040308	3000753	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor	8040305	3000762	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Cytochrome c	8040304	3000815	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Transmembrane di-heme cytochromes	8040302	3000517	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)	8040299	3000966	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	LuxS/MPP-like metallohydrolase	8040297	3001831	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	LuxS/MPP-like metallohydrolase	8040300	3001831	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	LuxS/MPP-like metallohydrolase	8040292	3001831	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	LuxS/MPP-like metallohydrolase	8040294	3001831	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
I	e2ibzI1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: Propep_M14	F:	ECOD (20:10:01)
H [auth G]	e2ibzG1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: Propep_M14	F:	ECOD (20:10:01)
G [auth F]	e2ibzF1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: p53 tetramerization domain	H: p53 tetramerization domain	T: Cation_efflux	F:	ECOD (20:10:01)
F [auth H]	e2ibzH1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: p53 tetramerization domain	H: p53 tetramerization domain	T: Cation_efflux	F:	ECOD (20:10:01)
E	e2ibzE1	A: Cloacin translocation domain	X: Cloacin translocation domain	H: Cloacin translocation domain	T: Urease_alpha	F:	ECOD (20:10:01)
E	e2ibzE2	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: Propep_M14	F:	ECOD (20:10:01)
E	e2ibzE3	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: EGF_CA	F:	ECOD (20:10:01)
D	e2ibzD1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: p53 tetramerization domain	H: p53 tetramerization domain	T: Cation_efflux	F:	ECOD (20:10:01)
D	e2ibzD2	A: UBC-like	X: UBC-like	H: Concanavalin A-like lectins/glucanases	T: EF-hand_1, EF-hand_7	F:	ECOD (20:10:01)
C	e2ibzC1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: p53 tetramerization domain	H: p53 tetramerization domain	T: Cation_efflux	F:	ECOD (20:10:01)
B	e2ibzB1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: DUF3197	F:	ECOD (20:10:01)
K [auth Y]	e2ibzY1	A: Cloacin translocation domain	X: Cloacin translocation domain	H: Cloacin translocation domain	T: Copper-bind	F:	ECOD (20:10:01)
J [auth X]	e2ibzX1	A: Cloacin translocation domain	X: Cloacin translocation domain	H: Cloacin translocation domain	T: Copper-bind	F:	ECOD (20:10:01)
A	e2ibzA1	A: C-terminal subdomain in Lon-related proteases catalytic domains	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: DUF3197	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
I	1.20.5.260	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Cytochrome b-c1 complex subunit 9	CATH (4.3.0)
H [auth G]	1.20.5.210	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Cytochrome b-c1 complex subunit 8	CATH (4.3.0)
G [auth F]	1.10.1090.10	Mainly Alpha	Orthogonal Bundle	Cytochrome Bc1 Complex	Chain F	CATH (4.3.0)
F [auth H]	1.10.287.20	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	Ubiquinol-cytochrome C reductase hinge domain	CATH (4.3.0)
E	1.20.5.270	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Ubiquinol cytochrome reductase, transmembrane domain	CATH (4.3.0)
E	2.102.10.10	Mainly Beta	3-layer Sandwich	Rieske Iron-sulfur Protein	Rieske [2Fe-2S] iron-sulphur domain	CATH (4.3.0)
D	1.10.760.10	Mainly Alpha	Orthogonal Bundle	Cytochrome Bc1 Complex	Chain D, domain 2	CATH (4.3.0)
D	1.20.5.100	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Cytochrome c1, transmembrane anchor, C-terminal	CATH (4.3.0)
C	1.20.810.10	Mainly Alpha	Up-down Bundle	Cytochrome Bc1 Complex	Chain C	CATH (4.3.0)
B	3.30.830.10	Alpha Beta	2-Layer Sandwich	Cytochrome Bc1 Complex	Chain A, domain 1	CATH (4.3.0)
K [auth Y]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
J [auth X]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	3.30.830.10	Alpha Beta	2-Layer Sandwich	Cytochrome Bc1 Complex	Chain A, domain 1	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
K [auth Y]	FV HEAVY KAPPA	V-KAPPA	Mus musculus (house mouse)	IGKV10-9403, IGKV10-9603, IGKV10-9404, IGKV10-9406, IGKV10-9604, IGKV10-9405, IGKV10-9408, IGKJ101	V-DOMAIN V-KAPPA	IG	FV-HEAVY_KAPPA	IMGT (202609-0)
J [auth X]	FV HEAVY KAPPA	VH	Mus musculus (house mouse)	IGHV3-602, IGHV3-601, IGHJ4*01	V-DOMAIN VH	IG	FV-HEAVY_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
K [auth Y]	Light Chain	IGKV10	Kappa	ubiquinol-cytochrome c reductase iron-sulfursubunit, mitochondrial precursor	SAbDab (2026-03-13)
J [auth X]	Heavy Chain	IGHV3	-	ubiquinol-cytochrome c reductase iron-sulfursubunit, mitochondrial precursor	SAbDab (2026-03-13)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
I	PF05365	Cytochrome b-c1 complex subunit 9 (UCR_UQCRX_QCR9)	Cytochrome b-c1 complex subunit 9	-	Family
H [auth G]	PF02939	UcrQ family (UcrQ)	UcrQ family	-	Family
G [auth F]	PF02271	Ubiquinol-cytochrome C reductase complex 14kD subunit (UCR_14kD)	Ubiquinol-cytochrome C reductase complex 14kD subunit	-	Family
F [auth H]	PF02320	Ubiquinol-cytochrome C reductase hinge protein (UCR_hinge)	Ubiquinol-cytochrome C reductase hinge protein	The ubiquinol-cytochrome C reductase complex (cytochrome bc1 complex) is a respiratory multienzyme complex [1]. This Pfam family represents the 'hinge' protein of the complex which is thought to mediate formation of the cytochrome c1 and cytochrome c ...	The ubiquinol-cytochrome C reductase complex (cytochrome bc1 complex) is a respiratory multienzyme complex [1]. This Pfam family represents the 'hinge' protein of the complex which is thought to mediate formation of the cytochrome c1 and cytochrome c complex.	Domain
E	PF02921	Ubiquinol cytochrome reductase transmembrane region (UCR_TM)	Ubiquinol cytochrome reductase transmembrane region	-	Family
E	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	PF02167	Cytochrome C1 family (Cytochrom_C1)	Cytochrome C1 family	-	Family
C	PF00032	Cytochrome b(C-terminal)/b6/petD (Cytochrom_B_C)	Cytochrome b(C-terminal)/b6/petD		Domain
C	PF00033	Cytochrome b/b6/petB (Cytochrome_B)	Cytochrome b/b6/petB		Domain
B	PF00675	Insulinase (Peptidase family M16) (Peptidase_M16)	Insulinase (Peptidase family M16)	-	Family
J [auth X]	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain
A	PF05193	Peptidase M16 inactive domain (Peptidase_M16_C)	Peptidase M16 inactive domain	Peptidase M16 consists of two structurally related domains. One is the active peptidase, whereas the other is inactive. The two domains hold the substrate like a clamp [1].	Domain
A	PF00675	Insulinase (Peptidase family M16) (Peptidase_M16)	Insulinase (Peptidase family M16)	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
I	Ubiquinol-cytochrome c reductase complex 7.3 kDa protein	-	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization 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 cytochrome complex assembly protein-containing complex organization mitochondrial respiratory chain complex III assembly cellular component organization cellular component biogenesis organelle organization cellular component assembly respiratory chain complex III assembly mitochondrial respiratory chain complex assembly protein-containing complex assembly cellular component organization or biogenesis mitochondrion organization	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III
H [auth G]	Ubiquinol-cytochrome c reductase complex ubiquinone-binding protein QP-C	monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity	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 cellular process mitochondrial ATP synthesis coupled electron transport	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III
G [auth F]	Ubiquinol-cytochrome c reductase complex 14 kDa protein	-	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization 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 cytochrome complex assembly protein-containing complex organization mitochondrial respiratory chain complex III assembly cellular component organization cellular component biogenesis organelle organization cellular component assembly respiratory chain complex III assembly mitochondrial respiratory chain complex assembly protein-containing complex assembly cellular component organization or biogenesis mitochondrion organization	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane side of membrane lumenal side of membrane matrix side of mitochondrial inner membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III
F [auth H]	Ubiquinol-cytochrome c reductase complex 17 kDa protein	-	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization 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	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane nucleus membrane-enclosed lumen intracellular organelle lumen organelle lumen nuclear periphery nuclear lumen respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III mitochondrial intermembrane space organelle envelope lumen
E	Ubiquinol-cytochrome c reductase iron-sulfur subunit, mitochondrial precursor	oxidoreductase activity catalytic activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity iron-sulfur cluster binding oxidoreductase activity catalytic activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter 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	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 cellular process mitochondrial ATP synthesis coupled electron transport	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III
D	Cytochrome c1, heme protein, mitochondrial precursor	monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity binding tetrapyrrole binding heme binding monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity binding tetrapyrrole binding heme binding cation binding ion binding metal ion binding small molecule binding	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 cellular process mitochondrial ATP synthesis coupled electron transport	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III cytosol mitochondrial intermembrane space membrane-enclosed lumen intracellular organelle lumen organelle envelope lumen organelle lumen
C	Cytochrome b	oxidoreductase activity catalytic activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity cation binding oxidoreductase activity catalytic activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity electron transfer activity active monoatomic ion transmembrane transporter activity oxidoreduction-driven active transmembrane transporter activity active transmembrane transporter activity quinol-cytochrome-c reductase activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity cation binding ion binding binding metal ion binding small molecule binding	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 cellular process mitochondrial ATP synthesis coupled electron transport	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III
B	Ubiquinol-cytochrome-c reductase complex core protein 2	peptidase activity catalytic activity, acting on a protein metalloendopeptidase activity hydrolase activity metallopeptidase activity catalytic activity endopeptidase activity cation binding ion binding binding metal ion binding small molecule binding	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization 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 proteolysis primary metabolic process protein metabolic process macromolecule metabolic process	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III mitochondrial crista
K [auth Y]	Variable Light chain of antibody fragment	-	response to stimulus immune response immune system process adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region
J [auth X]	Variable Heavy chain of antibody fragment	binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region
A	Ubiquinol-cytochrome-c reductase complex core protein 1	peptidase activity catalytic activity, acting on a protein metalloendopeptidase activity hydrolase activity metallopeptidase activity catalytic activity endopeptidase activity cation binding ion binding binding metal ion binding small molecule binding	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization aerobic respiration cellular respiration aerobic electron transport chain oxidative phosphorylation monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization 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	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane respiratory chain complex protein-containing complex cytochrome complex catalytic complex transmembrane transporter complex membrane protein complex transporter complex respiratory chain complex III

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
I	IPR008027	Cytochrome b-c1 complex subunit 9	Family
I	IPR036656	Cytochrome b-c1 complex subunit 9 superfamily	Homologous Superfamily
H [auth G]	IPR004205	Cytochrome b-c1 complex subunit 8	Family
H [auth G]	IPR036642	Cytochrome b-c1 complex subunit 8 superfamily	Homologous Superfamily
G [auth F]	IPR003197	Cytochrome b-c1 complex subunit 7	Family
G [auth F]	IPR036544	Cytochrome b-c1 complex subunit 7 superfamily	Homologous Superfamily
F [auth H]	IPR023184	Ubiquinol-cytochrome C reductase hinge domain	Domain
F [auth H]	IPR036811	Ubiquinol-cytochrome C reductase hinge domain superfamily	Homologous Superfamily
E	IPR036922	Rieske [2Fe-2S] iron-sulphur domain superfamily	Homologous Superfamily
E	IPR014349	Rieske iron-sulphur protein	Family
E	IPR004192	Cytochrome b-c1 complex subunit Rieske, transmembrane domain	Domain
E	IPR017941	Rieske [2Fe-2S] iron-sulphur domain	Domain
E	IPR005805	Rieske iron-sulphur protein, C-terminal	Domain
E	IPR037008	Cytochrome bc1 complex subunit Rieske, transmembrane domain superfamily	Homologous Superfamily
E	IPR006317	Ubiquinol-cytochrome c reductase, iron-sulphur subunit	Domain
D	IPR036909	Cytochrome c-like domain superfamily	Homologous Superfamily
D	IPR002326	Cytochrome c1	Family
D	IPR009056	Cytochrome c-like domain	Domain
D	IPR021157	Cytochrome c1, transmembrane anchor, C-terminal	Homologous Superfamily
C	IPR036150	Cytochrome b/b6, C-terminal domain superfamily	Homologous Superfamily
C	IPR027387	Cytochrome b/b6-like domain superfamily	Homologous Superfamily
C	IPR048260	Cytochrome b/b6, C-terminal domain, eukaryotic/bacterial	Domain
C	IPR016174	Di-haem cytochrome, transmembrane	Homologous Superfamily
C	IPR005798	Cytochrome b/b6, C-terminal	Domain
C	IPR048259	Cytochrome b/b6, N-terminal domain, eukaryotic/bacterial	Domain
C	IPR030689	Cytochrome b	Family
C	IPR005797	Cytochrome b/b6, N-terminal domain	Domain
B	IPR011249	Metalloenzyme, LuxS/M16 peptidase-like	Homologous Superfamily
B	IPR050361	Mitochondrial Processing Peptidase/Ubiquinol-cytochrome c Reductase Complex	Family
B	IPR011765	Peptidase M16, N-terminal	Domain
B	IPR001431	Peptidase M16, zinc-binding site	Binding Site
K [auth Y]	IPR050150	Immunoglobulin Variable Light Chain	Family
K [auth Y]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
K [auth Y]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
K [auth Y]	IPR013106	Immunoglobulin V-set domain	Domain
K [auth Y]	IPR003599	Immunoglobulin domain subtype	Domain
K [auth Y]	IPR007110	Immunoglobulin-like domain	Domain
J [auth X]	IPR050199	Immunoglobulin Heavy Variable	Family
J [auth X]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
J [auth X]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
J [auth X]	IPR013106	Immunoglobulin V-set domain	Domain
J [auth X]	IPR007110	Immunoglobulin-like domain	Domain
A	IPR007863	Peptidase M16, C-terminal	Domain
A	IPR011249	Metalloenzyme, LuxS/M16 peptidase-like	Homologous Superfamily
A	IPR050361	Mitochondrial Processing Peptidase/Ubiquinol-cytochrome c Reductase Complex	Family
A	IPR011765	Peptidase M16, N-terminal	Domain

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F [auth H], G [auth F], H [auth G], I, J [auth X]	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 [auth H], G [auth F], H [auth G], I, J [auth X]	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 [auth H], G [auth F], H [auth G], I, J [auth X]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Electron Transport Chain Complexes: Complex III (Cytochrome bc₁)	Cytochrome bc₁