7O3C

Murine supercomplex CIII2CIV in the mature unlocked conformation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure and assembly of the mammalian mitochondrial supercomplex CIII 2 CIV.

Vercellino, I.Sazanov, L.A.

(2021) Nature 

  • DOI: 10.1038/s41586-021-03927-z
  • Primary Citation of Related Structures:  
    7O37, 7O3C, 7O3E, 7O3H

  • PubMed Abstract: 
  • The enzymes of the mitochondrial electron transport chain are key players of cell metabolism. Despite being active when isolated, in vivo they associate into supercomplexes 1 , whose precise role is debated. Supercomplexes CIII 2 CIV 1-2 (refs ...

    The enzymes of the mitochondrial electron transport chain are key players of cell metabolism. Despite being active when isolated, in vivo they associate into supercomplexes 1 , whose precise role is debated. Supercomplexes CIII 2 CIV 1-2 (refs. 2,3 ), CICIII 2 (ref. 4 ) and CICIII 2 CIV (respirasome) 5-10 exist in mammals, but in contrast to CICIII 2 and the respirasome, to date the only known eukaryotic structures of CIII 2 CIV 1-2 come from Saccharomyces cerevisiae 11,12 and plants 13 , which have different organization. Here we present the first, to our knowledge, structures of mammalian (mouse and ovine) CIII 2 CIV and its assembly intermediates, in different conformations. We describe the assembly of CIII 2 CIV from the CIII 2 precursor to the final CIII 2 CIV conformation, driven by the insertion of the N terminus of the assembly factor SCAF1 (ref. 14 ) deep into CIII 2 , while its C terminus is integrated into CIV. Our structures (which include CICIII 2 and the respirasome) also confirm that SCAF1 is exclusively required for the assembly of CIII 2 CIV and has no role in the assembly of the respirasome. We show that CIII 2 is asymmetric due to the presence of only one copy of subunit 9, which straddles both monomers and prevents the attachment of a second copy of SCAF1 to CIII 2 , explaining the presence of one copy of CIV in CIII 2 CIV in mammals. Finally, we show that CIII 2 and CIV gain catalytic advantage when assembled into the supercomplex and propose a role for CIII 2 CIV in fine tuning the efficiency of electron transfer in the electron transport chain.


    Organizational Affiliation

    IV & LAS: IST Austria, Klosterneuburg, Austria. sazanov@ist.ac.at.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 1, mitochondrialA, K [auth L]446Mus musculusMutation(s): 0 
Gene Names: Uqcrc1
Membrane Entity: Yes 
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IMPC:  MGI:107876
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 2, mitochondrialB, L [auth M]439Mus musculusMutation(s): 0 
Gene Names: Uqcrc2
Membrane Entity: Yes 
UniProt
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome bC, M [auth N]381Mus musculusMutation(s): 0 
Gene Names: Mt-CybCobCytbmt-CytbMtcyb
Membrane Entity: Yes 
UniProt
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c1, heme protein, mitochondrialD, N [auth O]241Mus musculusMutation(s): 0 
Gene Names: Cyc1
EC: 7.1.1.8
Membrane Entity: Yes 
UniProt
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrialE, O [auth P]196Mus musculusMutation(s): 0 
Gene Names: Uqcrfs1
EC: 7.1.1.8
Membrane Entity: Yes 
UniProt
Find proteins for Q9CR68 (Mus musculus)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 7F, P [auth Q]110Mus musculusMutation(s): 0 
Gene Names: Uqcrb
Membrane Entity: Yes 
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IMPC:  MGI:1914780
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 8G, Q [auth R]81Mus musculusMutation(s): 0 
Gene Names: Uqcrq
Membrane Entity: Yes 
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IMPC:  MGI:107807
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 6, mitochondrialH, R [auth S]76Mus musculusMutation(s): 0 
Gene Names: Uqcrh
Membrane Entity: Yes 
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 9I [auth J], S [auth U]63Mus musculusMutation(s): 0 
Gene Names: Uqcr10
Membrane Entity: Yes 
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IMPC:  MGI:1913402
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 10J [auth K], T [auth V]56Mus musculusMutation(s): 0 
Gene Names: Uqcr11Uqcr
Membrane Entity: Yes 
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 9U [auth T]78Mus musculusMutation(s): 0 
Gene Names: Uqcrfs1
EC: 7.1.1.8
Membrane Entity: Yes 
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
Cox7a2l proteinV [auth I]113Mus musculusMutation(s): 0 
Gene Names: Cox7a2lGm6969
Membrane Entity: Yes 
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 1W [auth a]514Mus musculusMutation(s): 0 
Gene Names: Mtco1COImt-Co1
EC: 7.1.1.9
Membrane Entity: Yes 
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 2X [auth b]227Mus musculusMutation(s): 0 
Gene Names: Mtco2COIICOX2mt-Co2
EC: 7.1.1.9
Membrane Entity: Yes 
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 3Y [auth c]261Mus musculusMutation(s): 0 
Gene Names: mt-Co3COIIIMtco3
EC: 7.1.1.9
Membrane Entity: Yes 
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 4 isoform 1, mitochondrialZ [auth d]147Mus musculusMutation(s): 0 
Gene Names: Cox4i1Cox4Cox4a
Membrane Entity: Yes 
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IMPC:  MGI:88473
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 5A, mitochondrialAA [auth e]109Mus musculusMutation(s): 0 
Gene Names: Cox5a
Membrane Entity: Yes 
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Entity ID: 18
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 5B, mitochondrialBA [auth f]99Mus musculusMutation(s): 0 
Gene Names: Cox5b
Membrane Entity: Yes 
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IMPC:  MGI:88475
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Entity ID: 19
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 6A2, mitochondrialCA [auth g]85Mus musculusMutation(s): 0 
Gene Names: Cox6a2
Membrane Entity: Yes 
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Entity ID: 20
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 6B1DA [auth h]85Mus musculusMutation(s): 0 
Gene Names: Cox6b1Cox6b
Membrane Entity: Yes 
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IMPC:  MGI:107460
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Entity ID: 21
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 6CEA [auth i]75Mus musculusMutation(s): 0 
Gene Names: Cox6c
Membrane Entity: Yes 
UniProt
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Entity ID: 22
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 7B, mitochondrialFA [auth k]56Mus musculusMutation(s): 0 
Gene Names: Cox7b
Membrane Entity: Yes 
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Entity ID: 23
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 7C, mitochondrialGA [auth l]47Mus musculusMutation(s): 0 
Gene Names: Cox7cCox7c1
Membrane Entity: Yes 
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IMPC:  MGI:103226
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Entity ID: 24
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 8B, mitochondrialHA [auth m]46Mus musculusMutation(s): 0 
Gene Names: Cox8bCox8h
Membrane Entity: Yes 
UniProt
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  • Reference Sequence
Small Molecules
Ligands 13 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CDL (Subject of Investigation/LOI)
Query on CDL

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AB [auth O], JA [auth A], NA [auth C], OA [auth D], TB [auth g], VA [auth L], ZA [auth N]CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
 Ligand Interaction
TGL (Subject of Investigation/LOI)
Query on TGL

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WB [auth l]TRISTEAROYLGLYCEROL
C57 H110 O6
DCXXMTOCNZCJGO-UHFFFAOYSA-N
 Ligand Interaction
HEA (Subject of Investigation/LOI)
Query on HEA

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IB [auth a], JB [auth a]HEME-A
C49 H56 Fe N4 O6
ZGGYGTCPXNDTRV-PRYGPKJJSA-L
 Ligand Interaction
PC1 (Subject of Investigation/LOI)
Query on PC1

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EB [auth P], TA [auth J], UB [auth g]1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N
 Ligand Interaction
3PE (Subject of Investigation/LOI)
Query on 3PE

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BB [auth O] , FB [auth R] , IA [auth A] , KB [auth a] , LB [auth a] , MA [auth C] , MB [auth a] , OB [auth b] , 
BB [auth O],  FB [auth R],  IA [auth A],  KB [auth a],  LB [auth a],  MA [auth C],  MB [auth a],  OB [auth b],  QA [auth E],  QB [auth b],  RB [auth c],  SA [auth G],  UA [auth L],  VB [auth g],  YA [auth N]
1,2-Distearoyl-sn-glycerophosphoethanolamine
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
 Ligand Interaction
HEC (Subject of Investigation/LOI)
Query on HEC

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CB [auth O], PA [auth D]HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
HEM (Subject of Investigation/LOI)
Query on HEM

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KA [auth C], LA [auth C], WA [auth N], XA [auth N]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
FES
Query on FES

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DB [auth P], RA [auth E]FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
 Ligand Interaction
CUA
Query on CUA

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PB [auth b]DINUCLEAR COPPER ION
Cu2
ALKZAGKDWUSJED-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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SB [auth f]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

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GB [auth a]COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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NB [auth b]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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HB [auth a]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
H2020 Marie Curie Actions of the European CommissionAustria754411

Revision History  (Full details and data files)

  • Version 1.0: 2021-10-13
    Type: Initial release
  • Version 1.1: 2021-10-20
    Changes: Data collection, Database references