6Q9E

Complex III2 focused refinement from Ovine respiratory supercomplex I+III2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 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

Structures of Respiratory Supercomplex I+III2Reveal Functional and Conformational Crosstalk.

Letts, J.A.Fiedorczuk, K.Degliesposti, G.Skehel, M.Sazanov, L.A.

(2019) Mol.Cell 75: 1131-1146.e6

  • DOI: 10.1016/j.molcel.2019.07.022
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mitochondrial electron transport chain complexes are organized into supercomplexes (SCs) of defined stoichiometry, which have been proposed to regulate electron flux via substrate channeling. We demonstrate that CoQ trapping in the isolated SC I+ ...

    The mitochondrial electron transport chain complexes are organized into supercomplexes (SCs) of defined stoichiometry, which have been proposed to regulate electron flux via substrate channeling. We demonstrate that CoQ trapping in the isolated SC I+III 2 limits complex (C)I turnover, arguing against channeling. The SC structure, resolved at up to 3.8 Å in four distinct states, suggests that CoQ oxidation may be rate limiting because of unequal access of CoQ to the active sites of CIII 2 . CI shows a transition between "closed" and "open" conformations, accompanied by the striking rotation of a key transmembrane helix. Furthermore, the state of CI affects the conformational flexibility within CIII 2 , demonstrating crosstalk between the enzymes. CoQ was identified at only three of the four binding sites in CIII 2 , suggesting that interaction with CI disrupts CIII 2 symmetry in a functionally relevant manner. Together, these observations indicate a more nuanced functional role for the SCs.


    Organizational Affiliation

    Institute of Science and Technology Austria, Klosterneuberg 3400, Austria; Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA 95616, USA.,MRC Laboratory of Molecular Biology, Cambridge CB2 OQH, UK.,Institute of Science and Technology Austria, Klosterneuberg 3400, Austria. Electronic address: sazanov@ist.ac.at.,Institute of Science and Technology Austria, Klosterneuberg 3400, Austria; Laboratory of Membrane Biophysics and Biology, The Rockefeller University, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome c reductase core protein 1
a1, a3
446Ovis ariesMutation(s): 0 
Gene Names: UQCRC1
Find proteins for W5Q5G6 (Ovis aries)
Go to Gene View: UQCRC1
Go to UniProtKB:  W5Q5G6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome c reductase core protein 2
a2, a4
439Ovis ariesMutation(s): 0 
Gene Names: UQCRC2
Find proteins for W5Q0F9 (Ovis aries)
Go to Gene View: UQCRC2
Go to UniProtKB:  W5Q0F9
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Cytochrome b
b1, b2
379Ovis ariesMutation(s): 0 
Gene Names: MT-CYB (COB, CYTB, MTCYB)
Find proteins for P24959 (Ovis aries)
Go to Gene View: MT-CYB
Go to UniProtKB:  P24959
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c1
c1, c2
240Ovis ariesMutation(s): 0 
Gene Names: CYC1
Find proteins for W5Q0A9 (Ovis aries)
Go to Gene View: CYC1
Go to UniProtKB:  W5Q0A9
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Cytochrome b-c1 complex subunit Rieske, mitochondrial
f1, f2
196Ovis ariesMutation(s): 0 
Gene Names: LOC101113001
EC: 7.1.1.8
Find proteins for W5P2X9 (Ovis aries)
Go to UniProtKB:  W5P2X9
Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
Cytochrome b-c1 complex subunit 7
d1, d2
110Ovis ariesMutation(s): 0 
Gene Names: UQCRB
Find proteins for W5P642 (Ovis aries)
Go to Gene View: UQCRB
Go to UniProtKB:  W5P642
Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome c reductase complex III subunit VII
q1, q2
81Ovis ariesMutation(s): 0 
Gene Names: UQCRQ
Find proteins for W5PUP9 (Ovis aries)
Go to Gene View: UQCRQ
Go to UniProtKB:  W5PUP9
Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
Cytochrome b-c1 complex subunit 6
h1, h2
78Ovis ariesMutation(s): 0 
Gene Names: UQCRH
Find proteins for B9VH04 (Ovis aries)
Go to Gene View: UQCRH
Go to UniProtKB:  B9VH04
Entity ID: 9
MoleculeChainsSequence LengthOrganismDetails
Cytochrome b-c1 complex subunit Rieske, mitochondrial
x1, x2
33N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 10
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome c reductase, complex III subunit X
i1, i2
63Ovis ariesMutation(s): 0 
Gene Names: UQCR10
Find proteins for W5P6B2 (Ovis aries)
Go to Gene View: UQCR10
Go to UniProtKB:  W5P6B2
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
U10
Query on U10

Download SDF File 
Download CCD File 
b1, b2
UBIQUINONE-10
Coenzyme Q10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
 Ligand Interaction
CDL
Query on CDL

Download SDF File 
Download CCD File 
b1, b2, c1, c2
CARDIOLIPIN
DIPHOSPHATIDYL GLYCEROL; BIS-(1,2-DIACYL-SN-GLYCERO-3-PHOSPHO)-1',3'-SN-GLYCEROL
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
 Ligand Interaction
FES
Query on FES

Download SDF File 
Download CCD File 
f1, f2
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
b1, b2
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
HEC
Query on HEC

Download SDF File 
Download CCD File 
c1, c2
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
3PE
Query on 3PE

Download SDF File 
Download CCD File 
b1, b2, c1, f2
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
3-SN-PHOSPHATIDYLETHANOLAMINE
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
x1, x2
L-PEPTIDE LINKINGC4 H9 N O2

--

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilAustria701309

Revision History 

  • Version 1.0: 2019-08-21
    Type: Initial release
  • Version 1.1: 2019-09-18
    Type: Data collection, Database references
  • Version 1.2: 2019-10-02
    Type: Data collection, Database references