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- PDB-9w2x: Cryo-EM structure of complex III on the bovine heart submitochond... -

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Basic information

Entry
Database: PDB / ID: 9w2x
TitleCryo-EM structure of complex III on the bovine heart submitochondrial particles, III-1
Components
  • (Cytochrome b-c1 complex subunit ...) x 9
  • Cytochrome b
  • Cytochrome c1, heme protein, mitochondrial
KeywordsMOTOR PROTEIN / respiratory chain complex / supercomplex / submitochondrial particles
Function / homology
Function and homology information


Complex III assembly / subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / Respiratory electron transport / thalamus development / Mitochondrial translation termination / respiratory chain complex III / quinol-cytochrome-c reductase ...Complex III assembly / subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / Respiratory electron transport / thalamus development / Mitochondrial translation termination / respiratory chain complex III / quinol-cytochrome-c reductase / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c / Mitochondrial protein degradation / hypothalamus development / midbrain development / ubiquinone binding / respiratory electron transport chain / hippocampus development / metalloendopeptidase activity / 2 iron, 2 sulfur cluster binding / mitochondrial membrane / oxidoreductase activity / mitochondrial inner membrane / heme binding / protein-containing complex / mitochondrion / proteolysis / membrane / metal ion binding
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 / Cytochrome b-c1 complex subunit 9 / 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 / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / : / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / 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 c1, heme protein, mitochondrial / Cytochrome b-c1 complex subunit 6, mitochondrial / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 9 / Cytochrome b / Cytochrome b-c1 complex subunit 10 / Cytochrome b-c1 complex subunit 8 ...FE2/S2 (INORGANIC) CLUSTER / HEME C / PROTOPORPHYRIN IX CONTAINING FE / Cytochrome c1, heme protein, mitochondrial / Cytochrome b-c1 complex subunit 6, mitochondrial / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 9 / Cytochrome b / Cytochrome b-c1 complex subunit 10 / Cytochrome b-c1 complex subunit 8 / Cytochrome b-c1 complex subunit Rieske, mitochondrial / Cytochrome b-c1 complex subunit 2, mitochondrial / Cytochrome b-c1 complex subunit 1, mitochondrial
Similarity search - Component
Biological speciesBos taurus (domestic cattle)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.2 Å
AuthorsNakano, A. / Masuya, T. / Akisada, S. / Ishikawa-Fukuda, M. / Mitsuoka, K. / Miyoshi, H. / Murai, M. / Yokoyama, K.
Funding support Japan, 3items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)23H02453 Japan
Japan Society for the Promotion of Science (JSPS)25K01958 Japan
Ministry of Education, Culture, Sports, Science and Technology (Japan) Japan
CitationJournal: Nat Commun / Year: 2026
Title: Structures of respiratory supercomplexes and ATP synthase oligomers in mammalian mitochondrial inner membrane.
Authors: Atsuki Nakano / Takahiro Masuya / Shinsuke Akisada / Moe Ishikawa-Fukuda / Kaoru Mitsuoka / Hideto Miyoshi / Masatoshi Murai / Ken Yokoyama /
Abstract: Understanding the functional mechanisms of membrane protein complexes requires structural analysis within their native membrane environment. Here, we applied cryo-electron microscopy to determine the ...Understanding the functional mechanisms of membrane protein complexes requires structural analysis within their native membrane environment. Here, we applied cryo-electron microscopy to determine the structures of FF ATP synthase and respiratory supercomplexes (SCs) on sub-mitochondrial particles (SMPs) isolated from bovine heart mitochondria. Most FF complexes were observed as dimers stabilized by the regulatory factor IF₁, and a tetrameric assembly comprising two FF-IF₁ dimers arranged linearly was also identified. This finding indicates that the tetrameric units of FF are present in the mitochondrial inner membrane and contribute to shaping cristae tips in mammalian mitochondria. F domain maps resolve the e-subunit- c₈-ring interface and show no discrete density for a tightly bound lipid within the c₈-ring. In addition to the previously reported SCs compositions CI₁CIII₂CIV₁ and CI₁CIII₂CIV₂, our analysis identified an additional assembly with the composition CI₁CIII₂CIV₃, as well as a CI₂CIII₂CIV₆ mega-complex. This approach enables rapid structural determination of FF ATP synthase and SCs from minimal membrane fractions, providing a foundation for elucidating the molecular basis of metabolic disorders and mitochondrial diseases at the level of higher-order architecture.
History
DepositionJul 28, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 1, 2026Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Apr 1, 2026Data 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
A: Cytochrome b-c1 complex subunit 1, mitochondrial
B: Cytochrome b-c1 complex subunit 2, mitochondrial
C: Cytochrome b
D: Cytochrome c1, heme protein, mitochondrial
E: Cytochrome b-c1 complex subunit Rieske, mitochondrial
F: Cytochrome b-c1 complex subunit 7
G: Cytochrome b-c1 complex subunit 8
H: Cytochrome b-c1 complex subunit 6, mitochondrial
I: Cytochrome b-c1 complex subunit 9
J: Cytochrome b-c1 complex subunit 9
K: Cytochrome b-c1 complex subunit 10
L: Cytochrome b-c1 complex subunit 1, mitochondrial
M: Cytochrome b-c1 complex subunit 2, mitochondrial
N: Cytochrome b
O: Cytochrome c1, heme protein, mitochondrial
P: Cytochrome b-c1 complex subunit Rieske, mitochondrial
Q: Cytochrome b-c1 complex subunit 7
R: Cytochrome b-c1 complex subunit 8
S: Cytochrome b-c1 complex subunit 6, mitochondrial
T: Cytochrome b-c1 complex subunit 9
U: Cytochrome b-c1 complex subunit 9
V: Cytochrome b-c1 complex subunit 10
hetero molecules


Theoretical massNumber of molelcules
Total (without water)472,88630
Polymers468,83122
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 ... , 9 types, 18 molecules ALBMEPFQGRHSITJUKV

#1: Protein Cytochrome b-c1 complex subunit 1, mitochondrial / Complex III subunit 1 / Core protein I / Ubiquinol-cytochrome-c reductase complex core protein 1


Mass: 49266.254 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRC1 / Production host: Bos taurus (domestic cattle) / References: UniProt: P31800
#2: Protein Cytochrome b-c1 complex subunit 2, mitochondrial / Complex III subunit 2 / Core protein II / Ubiquinol-cytochrome-c reductase complex core protein 2


Mass: 45151.750 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRC2 / Production host: Bos taurus (domestic cattle) / References: UniProt: P23004
#5: Protein Cytochrome b-c1 complex subunit Rieske, mitochondrial / Complex III subunit 5 / Cytochrome b-c1 complex subunit 5 / Rieske iron-sulfur protein / RISP / ...Complex III subunit 5 / Cytochrome b-c1 complex subunit 5 / Rieske iron-sulfur protein / RISP / Rieske protein UQCRFS1 / Ubiquinol-cytochrome c reductase iron-sulfur subunit


Mass: 21640.580 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRFS1 / Production host: Bos taurus (domestic cattle) / References: UniProt: P13272, quinol-cytochrome-c reductase
#6: Protein Cytochrome b-c1 complex subunit 7 / Complex III subunit 7 / Complex III subunit VII / QP-C / Ubiquinol-cytochrome c reductase complex ...Complex III subunit 7 / Complex III subunit VII / QP-C / Ubiquinol-cytochrome c reductase complex 14 kDa protein


Mass: 12917.674 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRB / Production host: Bos taurus (domestic cattle) / References: UniProt: P00129
#7: Protein Cytochrome b-c1 complex subunit 8 / Complex III subunit 8 / Complex III subunit VIII / Ubiquinol-cytochrome c reductase complex 9.5 kDa ...Complex III subunit 8 / Complex III subunit VIII / Ubiquinol-cytochrome c reductase complex 9.5 kDa protein / Ubiquinol-cytochrome c reductase complex ubiquinone-binding protein QP-C


Mass: 8856.277 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRQ / Production host: Bos taurus (domestic cattle) / References: UniProt: P13271
#8: Protein Cytochrome b-c1 complex subunit 6, mitochondrial / Complex III subunit 6 / Complex III subunit VIII / Cytochrome c1 non-heme 11 kDa protein / ...Complex III subunit 6 / Complex III subunit VIII / Cytochrome c1 non-heme 11 kDa protein / Mitochondrial hinge protein / Ubiquinol-cytochrome c reductase complex 11 kDa protein


Mass: 7886.885 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRH / Production host: Bos taurus (domestic cattle) / References: UniProt: P00126
#9: Protein Cytochrome b-c1 complex subunit 9 / Su9 / Subunit 9 / 8 kDa subunit 9 / Complex III subunit IX / Cytochrome b-c1 complex subunit 11 / ...Su9 / Subunit 9 / 8 kDa subunit 9 / Complex III subunit IX / Cytochrome b-c1 complex subunit 11 / UQCRFS1 mitochondrial targeting sequence / UQCRFS1 MTS / Ubiquinol-cytochrome c reductase 8 kDa protein


Mass: 5824.802 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCRFS1 / Production host: Bos taurus (domestic cattle) / References: UniProt: P13272
#10: Protein Cytochrome b-c1 complex subunit 9 / Complex III subunit 9 / Complex III subunit X / Cytochrome c1 non-heme 7 kDa protein / Ubiquinol- ...Complex III subunit 9 / Complex III subunit X / Cytochrome c1 non-heme 7 kDa protein / Ubiquinol-cytochrome c reductase complex 7.2 kDa protein


Mass: 7080.131 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCR10 / Production host: Bos taurus (domestic cattle) / References: UniProt: P00130
#11: Protein Cytochrome b-c1 complex subunit 10 / Complex III subunit 10 / Complex III subunit XI / Ubiquinol-cytochrome c reductase complex 6.4 kDa protein


Mass: 5978.972 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: UQCR11, UQCR / Production host: Bos taurus (domestic cattle) / References: UniProt: P07552

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Protein , 2 types, 4 molecules CNDO

#3: Protein Cytochrome b / Complex III subunit 3 / Complex III subunit III / Cytochrome b-c1 complex subunit 3 / Ubiquinol- ...Complex III subunit 3 / Complex III subunit III / Cytochrome b-c1 complex subunit 3 / Ubiquinol-cytochrome-c reductase complex cytochrome b subunit


Mass: 42489.145 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: MT-CYB, COB, CYTB, MTCYB / Production host: Bos taurus (domestic cattle) / References: UniProt: P00157
#4: Protein Cytochrome c1, heme protein, mitochondrial / Complex III subunit 4 / Complex III subunit IV / Cytochrome b-c1 complex subunit 4 / Ubiquinol- ...Complex III subunit 4 / Complex III subunit IV / Cytochrome b-c1 complex subunit 4 / Ubiquinol-cytochrome-c reductase complex cytochrome c1 subunit / Cytochrome c-1


Mass: 27323.277 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: CYC1 / Production host: Bos taurus (domestic cattle) / References: UniProt: P00125, quinol-cytochrome-c reductase

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Non-polymers , 3 types, 8 molecules

#12: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


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


Mass: 618.503 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C34H34FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
#14: Chemical ChemComp-FES / FE2/S2 (INORGANIC) CLUSTER


Mass: 175.820 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe2S2 / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
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: Complex III on the bovine heart submitochondrial particles
Type: COMPLEX / Entity ID: #1-#4, #6-#11, #5 / Source: NATURAL
Molecular weightValue: 0.5 MDa / Experimental value: YES
Source (natural)Organism: Bos taurus (domestic cattle)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1Topazparticle selection
7Coot0.9.8.95model fitting
8ISOLDE1.9model fitting
13cryoSPARC4.73D reconstruction
14PHENIX1.21.2_5419model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 30421492
3D reconstructionResolution: 2.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 477031 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 1SQB

1sqb


Accession code: 1SQB / Source name: PDB / Type: experimental model

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