7O3H

Murine CIII2 focus-refined from supercomplex CICIII2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 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 598: 364-367

  • DOI: https://doi.org/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. 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.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 1, mitochondrialA,
K [auth L]
446Mus musculusMutation(s): 0 
Membrane Entity: Yes 
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IMPC:  MGI:107876
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UniProt GroupQ9CZ13
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 2, mitochondrialB,
L [auth M]
439Mus musculusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q9DB77 (Mus musculus)
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UniProt GroupQ9DB77
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome bC,
M [auth N]
381Mus musculusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P00158 (Mus musculus)
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UniProt GroupP00158
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c1, heme protein, mitochondrialD,
N [auth O]
241Mus musculusMutation(s): 0 
EC: 7.1.1.8
Membrane Entity: Yes 
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IMPC:  MGI:1913695
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UniProt GroupQ9D0M3
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrialE,
O [auth P]
196Mus musculusMutation(s): 0 
EC: 7.1.1.8
Membrane Entity: Yes 
UniProt
Find proteins for Q9CR68 (Mus musculus)
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UniProt GroupQ9CR68
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 7F,
P [auth Q]
110Mus musculusMutation(s): 0 
Membrane Entity: Yes 
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IMPC:  MGI:1914780
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 8G,
Q [auth R]
81Mus musculusMutation(s): 0 
Membrane Entity: Yes 
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IMPC:  MGI:107807
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UniProt GroupQ9CQ69
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 6, mitochondrialH,
R [auth S]
76Mus musculusMutation(s): 0 
Membrane Entity: Yes 
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 9I [auth J],
S [auth U]
63Mus musculusMutation(s): 0 
Membrane Entity: Yes 
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IMPC:  MGI:1913402
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UniProt GroupQ8R1I1
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 10J [auth K],
T [auth V]
56Mus musculusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q9CPX8 (Mus musculus)
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 9U [auth T]78Mus musculusMutation(s): 0 
Membrane Entity: Yes 
UniProt
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Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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DA [auth G]
EA [auth G]
LA [auth N]
MA [auth O]
RA [auth R]
DA [auth G],
EA [auth G],
LA [auth N],
MA [auth O],
RA [auth R],
W [auth A]
CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
PC1
Query on PC1

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GA [auth J],
QA [auth P]
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N
3PE
Query on 3PE

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BA [auth E]
FA [auth G]
HA [auth L]
KA [auth N]
NA [auth O]
BA [auth E],
FA [auth G],
HA [auth L],
KA [auth N],
NA [auth O],
SA [auth R],
V [auth A],
Z [auth C]
1,2-Distearoyl-sn-glycerophosphoethanolamine
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
HEC
Query on HEC

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AA [auth D],
OA [auth O]
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
HEM
Query on HEM

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IA [auth N],
JA [auth N],
X [auth C],
Y [auth C]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
FES
Query on FES

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CA [auth E],
PA [auth P]
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



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
  • Version 1.2: 2021-10-27
    Changes: Data collection, Database references