7RJD

Complex III2 from Candida albicans, inhibitor free, Rieske head domain in c position


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 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

Rieske head domain dynamics and indazole-derivative inhibition of Candida albicans complex III.

Di Trani, J.M.Liu, Z.Whitesell, L.Brzezinski, P.Cowen, L.E.Rubinstein, J.L.

(2022) Structure 30: 129

  • DOI: https://doi.org/10.1016/j.str.2021.08.006
  • Primary Citation of Related Structures:  
    7RJA, 7RJB, 7RJC, 7RJD, 7RJE

  • PubMed Abstract: 

    Electron transfer between respiratory complexes drives transmembrane proton translocation, which powers ATP synthesis and membrane transport. The homodimeric respiratory complex III (CIII 2 ) oxidizes ubiquinol to ubiquinone, transferring electrons to cytochrome c and translocating protons through a mechanism known as the Q cycle. The Q cycle involves ubiquinol oxidation and ubiquinone reduction at two different sites within each CIII monomer, as well as movement of the head domain of the Rieske subunit. We determined structures of Candida albicans CIII 2 by cryoelectron microscopy (cryo-EM), revealing endogenous ubiquinone and visualizing the continuum of Rieske head domain conformations. Analysis of these conformations does not indicate cooperativity in the Rieske head domain position or ligand binding in the two CIIIs of the CIII 2 dimer. Cryo-EM with the indazole derivative Inz-5, which inhibits fungal CIII 2 and is fungicidal when administered with fungistatic azole drugs, showed that Inz-5 inhibition alters the equilibrium of Rieske head domain positions.


  • Organizational Affiliation

    Molecular Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrialA [auth E],
J [auth M]
213Candida albicans SC5314Mutation(s): 0 
EC: 7.1.1.8
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PJX3 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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UniProt GroupA0A1D8PJX3
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquinol--cytochrome-c reductase subunitB [auth A]439Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PP59 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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UniProt GroupA0A1D8PP59
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome bC [auth K]387Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0C8L0 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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UniProt GroupP0C8L0
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquinol--cytochrome-c reductase catalytic subunit288Candida albicans SC5314Mutation(s): 0 
EC: 7.1.1.8
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PHA3 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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UniProt GroupA0A1D8PHA3
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 7E [auth G]127Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q5ABS1 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquinol--cytochrome-c reductase subunit 895Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PHA2 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquinol--cytochrome-c reductase subunit 6G [auth H]135Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PJT8 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquinol--cytochrome-c reductase subunit 9H [auth I]65Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1D8PLP3 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 2, mitochondrialI [auth B]374Candida albicans SC5314Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P83782 (Candida albicans (strain SC5314 / ATCC MYA-2876))
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UniProt GroupP83782
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Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
U10
Query on U10

Download Ideal Coordinates CCD File 
N [auth K],
O [auth K]
UBIQUINONE-10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
HEC
Query on HEC

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P [auth D]HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
HEM
Query on HEM

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L [auth K],
M [auth K]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
FES
Query on FES

Download Ideal Coordinates CCD File 
K [auth E]FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaPJT162186
Canadian Institutes of Health Research (CIHR)CanadaFDN154288
Knut and Alice Wallenberg FoundationSweden2019.0043
Swedish Research CouncilSweden2018-04619
Canada Research ChairsCanada--

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-15
    Type: Initial release
  • Version 1.1: 2021-09-29
    Changes: Database references
  • Version 1.2: 2022-01-19
    Changes: Database references