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- PDB-9c7h: Cryo-EM structure of respiratory supercomplex III -

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Basic information

Entry
Database: PDB / ID: 9c7h
TitleCryo-EM structure of respiratory supercomplex III
Components
  • (Cytochrome b-c1 complex subunit ...) x 6
  • (Ubiquinol-cytochrome c ...) x 2
  • Cytochrome b
  • Cytochrome c1
KeywordsELECTRON TRANSPORT / electron transporter / heart / respiratory supercomplex
Function / homology
Function and homology information


Complex III assembly / subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / thalamus development / mitochondrial respiratory chain complex III assembly / Respiratory electron transport / Mitochondrial protein degradation / respiratory chain complex III ...Complex III assembly / subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / thalamus development / mitochondrial respiratory chain complex III assembly / Respiratory electron transport / Mitochondrial protein degradation / respiratory chain complex III / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c / hypothalamus development / midbrain development / hippocampus development / metalloendopeptidase activity / 2 iron, 2 sulfur cluster binding / electron transfer activity / mitochondrial inner membrane / oxidoreductase activity / heme binding / mitochondrion / proteolysis / nucleoplasm / metal ion binding / membrane
Similarity search - Function
Cytochrome b-c1 complex subunit 10 / Single alpha-helix domain superfamily / Ubiquinol-cytochrome C reductase complex, 6.4kD protein / Ubiquinol-cytochrome c reductase 8kDa, N-terminal / Ubiquinol-cytochrome c reductase 8 kDa, N-terminal / Globular protein, non-globular alpha/beta subunit / Cytochrome b-c1 complex, subunit 6 / Cytochrome b-c1 complex subunit 8 / UcrQ family / Cytochrome bc1 complex subunit Rieske, transmembrane domain superfamily ...Cytochrome b-c1 complex subunit 10 / Single alpha-helix domain superfamily / Ubiquinol-cytochrome C reductase complex, 6.4kD protein / Ubiquinol-cytochrome c reductase 8kDa, N-terminal / Ubiquinol-cytochrome c reductase 8 kDa, N-terminal / Globular protein, non-globular alpha/beta subunit / Cytochrome b-c1 complex, subunit 6 / Cytochrome b-c1 complex subunit 8 / UcrQ family / Cytochrome bc1 complex subunit Rieske, transmembrane domain superfamily / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 7 superfamily / Ubiquinol-cytochrome C reductase complex 14kD subunit / Cytochrome b-c1 complex subunit 8 superfamily / Cytochrome b-c1 complex subunit Rieske, transmembrane domain / Ubiquinol cytochrome reductase transmembrane region / Cytochrome b-c1 complex subunit 9 / Cytochrome b-c1 complex subunit 9 superfamily / Ubiquinol-cytochrome C reductase, UQCRX/QCR9 like / Ubiquinol-cytochrome C reductase hinge domain / Ubiquinol-cytochrome C reductase hinge domain superfamily / Ubiquinol-cytochrome C reductase hinge protein / Cytochrome c1, transmembrane anchor, C-terminal / : / Cytochrome b / Ubiquinol-cytochrome c reductase, iron-sulphur subunit / : / Cytochrome c1 / Cytochrome C1 family / : / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome b/b6/petB / Rieske iron-sulphur protein, C-terminal / Cytochrome b/b6, N-terminal / Cytochrome b/b6-like domain superfamily / Cytochrome b/b6 N-terminal region profile. / Di-haem cytochrome, transmembrane / Rieske iron-sulphur protein / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like / Rieske [2Fe-2S] domain / Rieske [2Fe-2S] iron-sulphur domain / Rieske [2Fe-2S] iron-sulfur domain profile. / Rieske [2Fe-2S] iron-sulphur domain superfamily / Cytochrome c family profile. / Cytochrome c-like domain / Cytochrome c-like domain superfamily
Similarity search - Domain/homology
FE2/S2 (INORGANIC) CLUSTER / HEME C / PROTOPORPHYRIN IX CONTAINING FE / Cytochrome b-c1 complex subunit 7 / Cytochrome c1 / Cytochrome b-c1 complex subunit 1, mitochondrial / Cytochrome b-c1 complex subunit 8 / Complex III subunit 9 / Cytochrome b-c1 complex subunit 6 / Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1 ...FE2/S2 (INORGANIC) CLUSTER / HEME C / PROTOPORPHYRIN IX CONTAINING FE / Cytochrome b-c1 complex subunit 7 / Cytochrome c1 / Cytochrome b-c1 complex subunit 1, mitochondrial / Cytochrome b-c1 complex subunit 8 / Complex III subunit 9 / Cytochrome b-c1 complex subunit 6 / Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1 / Cytochrome b-c1 complex subunit 2, mitochondrial / Cytochrome b-c1 complex subunit 10 / Cytochrome b
Similarity search - Component
Biological speciesSus scrofa (pig)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.78 Å
AuthorsZhang, Z. / Maharjan, R. / Tringides, M.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: To Be Published
Title: Cryo-EM structure of respiratory supercomplex III
Authors: Zhang, Z. / Maharjan, R. / Tringides, M.
History
DepositionJun 10, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 2, 2025Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
0: Cytochrome b-c1 complex subunit 6, mitochondrial
1: Ubiquinol-cytochrome c reductase complex 7.2 kDa protein
2: Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1
3: Cytochrome b-c1 complex subunit 10
4: Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1
5: Cytochrome b-c1 complex subunit 1, mitochondrial
6: Cytochrome b-c1 complex subunit 2, mitochondrial
7: Cytochrome b
8: Cytochrome c1
9: Cytochrome b-c1 complex subunit 7
u: Cytochrome b-c1 complex subunit 1, mitochondrial
v: Cytochrome b-c1 complex subunit 2, mitochondrial
w: Cytochrome b
x: Cytochrome c1
y: Cytochrome b-c1 complex subunit 7
z: Cytochrome b-c1 complex subunit 8
Af: Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1
Ae: Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1
Aa: Cytochrome b-c1 complex subunit 8
Ab: Cytochrome b-c1 complex subunit 6, mitochondrial
Ac: Ubiquinol-cytochrome c reductase complex 7.2 kDa protein
Ad: Cytochrome b-c1 complex subunit 10
hetero molecules


Theoretical massNumber of molelcules
Total (without water)587,51230
Polymers583,45722
Non-polymers4,0558
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Cytochrome b-c1 complex subunit ... , 6 types, 12 molecules 0Ab3Ad5u6v9yzAa

#1: Protein Cytochrome b-c1 complex subunit 6, mitochondrial


Mass: 10685.803 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A8D1JI21
#4: Protein Cytochrome b-c1 complex subunit 10


Mass: 6560.654 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: F1SDI2
#5: Protein Cytochrome b-c1 complex subunit 1, mitochondrial


Mass: 52756.320 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A8D0PK14
#6: Protein Cytochrome b-c1 complex subunit 2, mitochondrial


Mass: 48262.434 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: F1RPD2
#9: Protein Cytochrome b-c1 complex subunit 7


Mass: 13587.549 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A286ZPR8
#10: Protein Cytochrome b-c1 complex subunit 8


Mass: 9784.339 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A8D0SHY6

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Ubiquinol-cytochrome c ... , 2 types, 6 molecules 1Ac24AfAe

#2: Protein Ubiquinol-cytochrome c reductase complex 7.2 kDa protein / cytochrome b-c1 complex subunit 9


Mass: 7412.530 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A8D1J3N6
#3: Protein
Ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 1


Mass: 32174.654 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: F1RNZ1

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Protein , 2 types, 4 molecules 7w8x

#7: Protein Cytochrome b


Mass: 42840.715 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: Q1HBG9
#8: Protein Cytochrome c1


Mass: 35488.930 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / References: UniProt: A0A287AZF9

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Non-polymers , 3 types, 8 molecules

#11: Chemical ChemComp-FES / FE2/S2 (INORGANIC) CLUSTER


Mass: 175.820 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe2S2
#12: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H32FeN4O4
#13: Chemical ChemComp-HEC / HEME C


Mass: 618.503 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C34H34FeN4O4

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Cryo-EM structure of respiratory supercomplex III / Type: COMPLEX / Entity ID: #1-#10 / Source: NATURAL
Source (natural)Organism: Sus scrofa (pig)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 81000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.78 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 43845 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00333602
ELECTRON MICROSCOPYf_angle_d0.51945675
ELECTRON MICROSCOPYf_dihedral_angle_d11.8312167
ELECTRON MICROSCOPYf_chiral_restr0.044993
ELECTRON MICROSCOPYf_plane_restr0.0045836

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