3h1i

Stigmatellin and antimycin bound cytochrome bc1 complex from chicken

Method: X-RAY DIFFRACTION

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Cytochrome b

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 20	UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN I, MITOCHONDRIAL × 2 UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN 2, MITOCHONDRIAL × 2 CYTOCHROME C1, HEME PROTEIN, MITOCHONDRIAL × 2 Cytochrome b-c1 complex subunit Rieske, mitochondrial × 2 （Q5ZLR5） UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 14 KDA PROTEIN × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX UBIQUINONE-BINDING PROTEIN QP-C × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 11 KDA PROTEIN × 2 Cytochrome b-c1 complex subunit Rieske, mitochondrial × 2 （Q5ZLR5） UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 7.2 KDA PROTEIN × 2 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 6 UNKNOWN LIGAND × 10 PROTOPORPHYRIN IX CONTAINING FE × 4 STIGMATELLIN A × 2 2-METHYL-BUTYRIC ACID 3-(3-FORMYLAMINO-2-HYDROXY-BENZOYLAMINO)-8-HEPTYL-2,6-DIMETHYL-4,9-DIOXO-[1,5]DIOXONAN-7-YL ESTER × 2 CARDIOLIPIN × 4 GLYCEROL × 2 HEME C × 2 FE2/S2 (INORGANIC) CLUSTER × 2 DIUNDECYL PHOSPHATIDYL CHOLINE × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYB_CHICK
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–380； UniProt 1–380 Author chain P； PDBConstruct 1–380； UniProt 1–380

Cytochrome b-c1 complex subunit Rieske, mitochondrial

OrganismNot specified

UniProt Q5ZLR5

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 20	UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN I, MITOCHONDRIAL × 2 UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN 2, MITOCHONDRIAL × 2 Cytochrome b × 2 （P18946） CYTOCHROME C1, HEME PROTEIN, MITOCHONDRIAL × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 14 KDA PROTEIN × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX UBIQUINONE-BINDING PROTEIN QP-C × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 11 KDA PROTEIN × 2 UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 7.2 KDA PROTEIN × 2 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 6 UNKNOWN LIGAND × 10 PROTOPORPHYRIN IX CONTAINING FE × 4 STIGMATELLIN A × 2 2-METHYL-BUTYRIC ACID 3-(3-FORMYLAMINO-2-HYDROXY-BENZOYLAMINO)-8-HEPTYL-2,6-DIMETHYL-4,9-DIOXO-[1,5]DIOXONAN-7-YL ESTER × 2 CARDIOLIPIN × 4 GLYCEROL × 2 HEME C × 2 FE2/S2 (INORGANIC) CLUSTER × 2 DIUNDECYL PHOSPHATIDYL CHOLINE × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	UCRI_CHICK
Isoform	—
PDB entities	5, 9
Chains and sequence ranges	Author chain E； PDBConstruct 1–196； UniProt 77–272 Author chain R； PDBConstruct 1–196； UniProt 77–272 Author chain I； PDBConstruct 16–47； UniProt 45–76 Author chain V； PDBConstruct 16–47； UniProt 45–76

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	3h1i
Deposition date deposition_date	2009-04-12
Structure title title	Stigmatellin and antimycin bound cytochrome bc1 complex from chicken
Keywords keywords	;CYTOCHROME BC1, MEMBRANE PROTEIN, HEME PROTEIN, RIESKE IRON SULFUR PROTEIN, CYTOCHROME B, CYTOCHROME C1, COMPLEX III, MITOCHONDRIAL PROCESSING PROTEASE, UBIQUINONE, OXIDOREDUCTASE, REDOX ENZYME, RESPIRATORY CHAIN, STIGMATELLIN, ANTIMYCIN, Electron transport, Heme, Iron, Membrane, Metal-binding, Mitochondrion, Mitochondrion inner membrane, Transmembrane, Transport, Disulfide bond, Iron-sulfur, Transit peptide ;; OXIDOREDUCTASE
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

3h1i__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3h1i__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3h1i__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	55.02 Å
Rg (electron density)	54.14 Å
Total Rg	54.33 Å
Atom count	32698
Residues	4067
Excluded volume	584650 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3h1i__assembly_1__model_1`	eicosameric （20）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (20)

Entity 1 Entity 1 polymer

Description description	UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN I, MITOCHONDRIAL
Molecular weight formula_weight	49503.8 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,N
Atom count atom_count	32701

AATYAQTLQNIPETNVTTLDNGLRVASEESSQPTCTVGVWIGAGSRYENEKNNGAGYFVEHLAFKGTKKRPCAAFEKEVESMGAHFNGYTSREQTAFYIKALSKDMPKVVELLADVVQNCALEESQIEKERGVILQELKEMDNDMTNVTFDYLHATAFQGTALARTVEGTTENIKHLTRADLASYIDTHFKAPRMVLAAAGGISHKELVDAARQHFSGVSFTYKEDAVPILPRCRFTGSEIRARDDALPVAHVALAVEGPGWADPDNVVLHVANAIIGRYDRTFGGGKHLSSRLAALAVEHKLCHSFQTFNTSYSDTGLFGFHFVADPLSIDDMMFCAQGEWMRLCTSTTESEVKRAKNHLRSAMVAQLDGTTPVCETIGSHLLNYGRRISLEEWDSRISAVDARMVRDVCSKYIYDKCPALAAVGPIEQLLDYNRIRSGMYWIRF

Entity 2 Entity 2 polymer

Description description	UBIQUINOL-CYTOCHROME-C REDUCTASE COMPLEX CORE PROTEIN 2, MITOCHONDRIAL
Molecular weight formula_weight	46683.8 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,O

SLKVAPKVAVSAAAERVKLCPGAEDLEITKLPNGLIIASLENFSPASRIGVFIKAGSRYETTANLGTAHLLRLASPLTTKGASSFRITRGIEAVGGSLSVYSTREKMTYCVECLRDHVDTVMEYLLNVTTAPEFRPWEVTDLQPQLKVDKAVAFQSPQVGVLENLHAAAYKTALANPLYCPDYRIGKITSEQLHHFVQNNFTSARMALVGIGVKHSDLKQVAEQFLNIRSGAGTSSAKATYWGGEIREQNGHSLVHAAVVTEGAAVGSAEANAFSVLQHVLGAGPLIKRGSSVTSKLYQGVAKATTQPFDASAFNVNYSDSGLFGFYTISQAAHAGEVIRAAMNQLKAAAQGGVTEEDVTKAKNQLKATYLMSVETAQGLLNEIGSEALLSGTHTAPSVVAQKIDSVTSADVVNAAKKFVSGKKSMAASGDLGSTPFLDEL

Entity 3 Entity 3 polymer

Description description	Cytochrome b
Molecular weight formula_weight	42623.0 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,P

MAPNIRKSHPLLKMINNSLIDLPAPSNISAWWNFGSLLAVCLMTQILTGLLLAMHYTADTSLAFSSVAHTCRNVQYGWLIRNLHANGASFFFICIFLHIGRGLYYGSYLYKETWNTGVILLLTLMATAFVGYVLPWGQMSFWGATVITNLFSAIPYIGHTLVEWAWGGFSVDNPTLTRFFALHFLLPFAIAGITIIHLTFLHESGSNNPLGISSDSDKIPFHPYYSFKDILGLTLMLTPFLTLALFSPNLLGDPENFTPANPLVTPPHIKPEWYFLFAYAILRSIPNKLGGVLALAASVLILFLIPFLHKSKQRTMTFRPLSQTLFWLLVANLLILTWIGSQPVEHPFIIIGQMASLSYFTILLILFPTIGTLENKMLNY

Entity 4 Entity 4 polymer

Description description	CYTOCHROME C1, HEME PROTEIN, MITOCHONDRIAL
Molecular weight formula_weight	26973.7 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,Q

GELELHPPAFPWSHGGPLSALDHSSVRRGFQVYKQVCSACHSMDYVAFRNLIGVTHTEAEAKALAEEVEVQDGPDENGELFMRPGKISDYFPKPYPNPEAARAANNGALPPDLSYIVNARHGGEDYVFSLLTGYCDPPAGVVVREGLHYNPYFPGQAIGMAPPIYNEILEYDDGTPATMSQIAKDVCTFLRWAAEPEHDQRKRMGLKMLLISALLTSLLYYMKRHKWSVLKSRKMAYRPPK

Entity 5 Entity 5 polymer

Description description	Cytochrome b-c1 complex subunit Rieske, mitochondrial
Molecular weight formula_weight	21506.2 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,R

VHNDVTVPDFSAYRREDVMDATTSSQTSSEDRKGFSYLVTATACVATAYAAKNVVTQFISSLSASADVLALSKIEIKLSDIPEGKNVAFKWRGKPLFVRHRTQAEINQEAEVDVSKLRDPQHDLDRVKKPEWVILVGVCTHLGCVPIANSGDFGGYYCPCHGSHYDASGRIRKGPAPYNLEVPTYQFVGDDLVVVG

Entity 6 Entity 6 polymer

Description description	UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 14 KDA PROTEIN
Molecular weight formula_weight	13394.4 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F,S

AARATVAGGGRLMDRIRKWYYNAAGFNKYGLMRDDTLYEDDDVKEALKRLPEDLYNERMFRIKRALDLSLKHRILPKEQWVKYEEDKPYLEPYLKEVIRERLEREAWNKK

Entity 7 Entity 7 polymer

Description description	UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX UBIQUINONE-BINDING PROTEIN QP-C
Molecular weight formula_weight	9498.7 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	G,T

GIHFGNLARVRHIITYSLSPFEQRAIPNIFSDALPNVWRRFSSQVFKVAPPFLGAYLLYSWGTQEFERLKRKNPADYENDQ

Entity 8 Entity 8 polymer

Description description	UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 11 KDA PROTEIN
Molecular weight formula_weight	9057.1 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H,U

LRGSGEEEEEELVDPLTTIREHCEQTEKCVKARERLELCDARVSSRSHTEEQCTEELFDFLHARDHCVAHKLFNKLK

Entity 9 Entity 9 polymer

Description description	Cytochrome b-c1 complex subunit Rieske, mitochondrial
Molecular weight formula_weight	4785.6 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I,V

XXXXXXXXXXXXXXXRPLLCRESMSGRSARRDLVAGISLNAPASVRY

Entity 10 Entity 10 polymer

Description description	UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX 7.2 KDA PROTEIN
Molecular weight formula_weight	7006.0 kDa
EC 编号 ec_number	1.10.2.2
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	J,W

ALLRQAYSALFRRTSTFALTVVLGAVLFERAFDQGADAIFEHLNEGKLWKHIKHKYEASEE

Entity 11 Entity 11 non-polymer

Description description	1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
Molecular weight formula_weight	744.0 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 12 Entity 12 non-polymer

Description description	UNKNOWN LIGAND
Source method src_method	syn
Copy count entity_count	10

Entity 13 Entity 13 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 14 Entity 14 non-polymer

Description description	STIGMATELLIN A
Molecular weight formula_weight	514.6 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 15 Entity 15 non-polymer

Description description	2-METHYL-BUTYRIC ACID 3-(3-FORMYLAMINO-2-HYDROXY-BENZOYLAMINO)-8-HEPTYL-2,6-DIMETHYL-4,9-DIOXO-[1,5]DIOXONAN-7-YL ESTER
Molecular weight formula_weight	562.7 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 16 Entity 16 non-polymer

Description description	CARDIOLIPIN
Molecular weight formula_weight	1464.0 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 17 Entity 17 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 18 Entity 18 non-polymer

Description description	HEME C
Molecular weight formula_weight	618.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 19 Entity 19 non-polymer

Description description	FE2/S2 (INORGANIC) CLUSTER
Molecular weight formula_weight	175.8 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 20 Entity 20 non-polymer

Description description	DIUNDECYL PHOSPHATIDYL CHOLINE
Molecular weight formula_weight	622.8 kDa
Source method src_method	syn
Copy count entity_count	2

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6. Fold Classification (SCOP + CATH) 28 domains

CATH v4.4 (28 domains)

Domain ID domain_id	3h1iA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iC00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	810 — Cytochrome Bc1 Complex; Chain C
Homologous superfamily homologous superfamily	10 — Cytochrome Bc1 Complex; Chain C

Domain ID domain_id	3h1iD01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	3h1iD02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	100 — Cytochrome c1, transmembrane anchor, C-terminal

Domain ID domain_id	3h1iE01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	270 — Ubiquinol cytochrome reductase, transmembrane domain

Domain ID domain_id	3h1iE02
Class class	2 — Mainly Beta
Architecture architecture	102 — 3-layer Sandwich
Topology topology	10 — Rieske Iron-sulfur Protein
Homologous superfamily homologous superfamily	10 — Rieske [2Fe-2S] iron-sulphur domain

Domain ID domain_id	3h1iF00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1090 — Cytochrome Bc1 Complex; Chain F
Homologous superfamily homologous superfamily	10 — Cytochrome b-c1 complex subunit 7

Domain ID domain_id	3h1iG00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	210 — Cytochrome b-c1 complex subunit 8

Domain ID domain_id	3h1iH00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	20 — Ubiquinol-cytochrome C reductase hinge domain

Domain ID domain_id	3h1iI00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	210 — Cytochrome Bc1 Complex; Chain I
Homologous superfamily homologous superfamily	10 — Cytochrome Bc1 Complex; Chain I

Domain ID domain_id	3h1iJ00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	260 — Cytochrome b-c1 complex subunit 9

Domain ID domain_id	3h1iN01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iN02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iO01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iO02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	830 — Cytochrome Bc1 Complex; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Metalloenzyme, LuxS/M16 peptidase-like

Domain ID domain_id	3h1iP00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	810 — Cytochrome Bc1 Complex; Chain C
Homologous superfamily homologous superfamily	10 — Cytochrome Bc1 Complex; Chain C

Domain ID domain_id	3h1iQ01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	3h1iQ02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	100 — Cytochrome c1, transmembrane anchor, C-terminal

Domain ID domain_id	3h1iR01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	270 — Ubiquinol cytochrome reductase, transmembrane domain

Domain ID domain_id	3h1iR02
Class class	2 — Mainly Beta
Architecture architecture	102 — 3-layer Sandwich
Topology topology	10 — Rieske Iron-sulfur Protein
Homologous superfamily homologous superfamily	10 — Rieske [2Fe-2S] iron-sulphur domain

Domain ID domain_id	3h1iS00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1090 — Cytochrome Bc1 Complex; Chain F
Homologous superfamily homologous superfamily	10 — Cytochrome b-c1 complex subunit 7

Domain ID domain_id	3h1iT00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	210 — Cytochrome b-c1 complex subunit 8

Domain ID domain_id	3h1iU00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	20 — Ubiquinol-cytochrome C reductase hinge domain

Domain ID domain_id	3h1iV00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	210 — Cytochrome Bc1 Complex; Chain I
Homologous superfamily homologous superfamily	10 — Cytochrome Bc1 Complex; Chain I

Domain ID domain_id	3h1iW00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	260 — Cytochrome b-c1 complex subunit 9

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Unit-cell length a length_a	174.693 Å
Unit-cell length b length_b	181.666 Å
Unit-cell length c length_c	240.732 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	3.530 Å
Low-resolution limit resolution_low	19.990 Å
R factor r_factor	0.2640
R_work r_work	0.2630
R_free r_free	0.3060

Stigmatellin and antimycin bound cytochrome bc1 complex from chicken

1. Protein Identity and Related Structures Protein Identity & Related Structures

Cytochrome b

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Cytochrome b-c1 complex subunit Rieske, mitochondrial

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

3h1i__assembly_1__model_1

3h1i__assembly_1__model_1 | I(q)

3h1i__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (20)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 polymer

Polymer Polymer

Entity 6 Entity 6 polymer

Polymer Polymer

Entity 7 Entity 7 polymer

Polymer Polymer

Entity 8 Entity 8 polymer

Polymer Polymer

Entity 9 Entity 9 polymer

Polymer Polymer

Entity 10 Entity 10 polymer

Polymer Polymer

Entity 11 Entity 11 non-polymer

Entity 12 Entity 12 non-polymer

Entity 13 Entity 13 non-polymer

Entity 14 Entity 14 non-polymer

Entity 15 Entity 15 non-polymer

Entity 16 Entity 16 non-polymer

Entity 17 Entity 17 non-polymer

Entity 18 Entity 18 non-polymer

Entity 19 Entity 19 non-polymer

Entity 20 Entity 20 non-polymer

6. Fold Classification (SCOP + CATH) 28 domains

CATH v4.4 (28 domains)

7. Citations (3)