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Open data
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Basic information
Entry | Database: PDB / ID: 8q1b | ||||||
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Title | III2-IV1 respiratory supercomplex from S. pombe | ||||||
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![]() | MEMBRANE PROTEIN / Supercomplex / respiration | ||||||
Function / homology | ![]() Respiratory electron transport / Complex III assembly / Mitochondrial protein degradation / mitochondrial processing peptidase complex / mitochondrial processing peptidase / protein processing involved in protein targeting to mitochondrion / mitochondrial cytochrome c oxidase assembly / respiratory chain complex IV / respiratory chain complex / cytochrome-c oxidase ...Respiratory electron transport / Complex III assembly / Mitochondrial protein degradation / mitochondrial processing peptidase complex / mitochondrial processing peptidase / protein processing involved in protein targeting to mitochondrion / mitochondrial cytochrome c oxidase assembly / respiratory chain complex IV / respiratory chain complex / cytochrome-c oxidase / respiratory chain complex III / quinol-cytochrome-c reductase / mitochondrial electron transport, cytochrome c to oxygen / ubiquinol-cytochrome-c reductase activity / cytochrome-c oxidase activity / mitochondrial electron transport, ubiquinol to cytochrome c / ATP synthesis coupled electron transport / enzyme regulator activity / proton transmembrane transport / aerobic respiration / respiratory electron transport chain / mitochondrial membrane / metalloendopeptidase activity / mitochondrial intermembrane space / 2 iron, 2 sulfur cluster binding / oxidoreductase activity / mitochondrial inner membrane / copper ion binding / heme binding / structural molecule activity / mitochondrion / membrane / metal ion binding Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | ||||||
![]() | Moe, A. / Brzezinski, P. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structure and function of the III-IV-cyt supercomplex. Authors: Agnes Moe / Anna-Roza Dimogkioka / Doron Rapaport / Linda Näsvik Öjemyr / Peter Brzezinski / ![]() ![]() Abstract: The respiratory chain in aerobic organisms is composed of a number of membrane-bound protein complexes that link electron transfer to proton translocation across the membrane. In mitochondria, the ...The respiratory chain in aerobic organisms is composed of a number of membrane-bound protein complexes that link electron transfer to proton translocation across the membrane. In mitochondria, the final electron acceptor, complex IV (CIV), receives electrons from dimeric complex III (CIII), via a mobile electron carrier, cytochrome . In the present study, we isolated the CIIICIV supercomplex from the fission yeast and determined its structure with bound cyt. using single-particle electron cryomicroscopy. A respiratory supercomplex factor 2 was found to be bound at CIV distally positioned in the supercomplex. In addition to the redox-active metal sites, we found a metal ion, presumably Zn, coordinated in the CIII subunit Cor1, which is encoded by the same gene () as the mitochondrial-processing peptidase subunit β. Our data show that the isolated CIIICIV supercomplex displays proteolytic activity suggesting a dual role of CIII in . As in the supercomplex from , subunit Cox5 of CIV faces towards one CIII monomer, but in the two complexes are rotated relative to each other by ~45°. This orientation yields equal distances between the cyt. binding sites at CIV and at each of the two CIII monomers. The structure shows cyt. bound at four positions, but only along one of the two symmetrical branches. Overall, this combined structural and functional study reveals the integration of peptidase activity with the CIII respiratory system and indicates a two-dimensional cyt. diffusion mechanism within the CIII-CIV supercomplex. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.2 MB | Display | ![]() |
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PDB format | ![]() | 990 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 2.8 MB | Display | ![]() |
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Full document | ![]() | 2.8 MB | Display | |
Data in XML | ![]() | 172.2 KB | Display | |
Data in CIF | ![]() | 255 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 18062MC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-Protein , 4 types, 7 molecules ALCNDOl
#1: Protein | Mass: 50802.277 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #3: Protein | Mass: 43760.602 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #4: Protein | Mass: 34383.094 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #22: Protein | | Mass: 27084.996 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Cytochrome b-c1 complex subunit ... , 7 types, 14 molecules BMEPFQGRHSITJU
#2: Protein | Mass: 45704.973 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #5: Protein | Mass: 24769.352 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #6: Protein | Mass: 24340.496 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #7: Protein | Mass: 16058.521 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #8: Protein | Mass: 10481.070 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #9: Protein | Mass: 7807.629 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #10: Protein | Mass: 9136.762 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Cytochrome c oxidase subunit ... , 9 types, 9 molecules abcdfgijk
#11: Protein | Mass: 59607.680 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#12: Protein | Mass: 28139.258 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#13: Protein | Mass: 30432.148 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#14: Protein | Mass: 17624.094 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#16: Protein | Mass: 15958.173 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#17: Protein | Mass: 6741.878 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#19: Protein | Mass: 6652.764 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#20: Protein | Mass: 10275.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#21: Protein | Mass: 15224.184 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Cytochrome c oxidase polypeptide ... , 2 types, 2 molecules eh
#15: Protein | Mass: 24933.271 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: cox5, SPCC338.10c / Production host: ![]() ![]() |
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#18: Protein | Mass: 7512.846 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Protein/peptide , 1 types, 1 molecules m
#23: Protein/peptide | Mass: 2230.741 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Non-polymers , 13 types, 39 molecules 
























#24: Chemical | #25: Chemical | ChemComp-CDL / #26: Chemical | ChemComp-PCF / #27: Chemical | ChemComp-PEF / #28: Chemical | ChemComp-HEM / #29: Chemical | #30: Chemical | #31: Chemical | #32: Chemical | #33: Chemical | ChemComp-CU / | #34: Chemical | ChemComp-CA / | #35: Chemical | ChemComp-MG / | #36: Chemical | ChemComp-CUA / | |
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-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: III2-IV1 respiratory supercomplex / Type: COMPLEX / Entity ID: #1-#23 / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: C-flat-2/2 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 600 nm |
Image recording | Electron dose: 41 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 125752 / Symmetry type: POINT | ||||||||||||||||||||||||
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