6NHG

Rhodobacter sphaeroides Mitochondrial respiratory chain complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.252 

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Literature

Crystal structure of bacterial cytochromebc1in complex with azoxystrobin reveals a conformational switch of the Rieske iron-sulfur protein subunit.

Esser, L., Zhou, F., Yu, C.A., Xia, D.

(2019) J Biol Chem 294: 12007-12019

  • DOI: 10.1074/jbc.RA119.008381
  • Primary Citation of Related Structures:  
    6NHG, 6NHH, 6NIN

  • PubMed Abstract: 

    • Cytochrome bc 1 complexes (cyt bc 1 ), also known as complex III in mitochondria, are components of the cellular respiratory chain and of the photosynthetic apparatus of non-oxygenic photosynthetic bacteria. They catalyze electron transfer (ET) from ubiquinol to cytochrome c and concomitantly translocate protons across the membrane, contributing to the cross-membrane potential essential for a myriad of cellular activities ...

    Cytochrome bc 1 complexes (cyt bc 1 ), also known as complex III in mitochondria, are components of the cellular respiratory chain and of the photosynthetic apparatus of non-oxygenic photosynthetic bacteria. They catalyze electron transfer (ET) from ubiquinol to cytochrome c and concomitantly translocate protons across the membrane, contributing to the cross-membrane potential essential for a myriad of cellular activities. This ET-coupled proton translocation reaction requires a gating mechanism that ensures bifurcated electron flow. Here, we report the observation of the Rieske iron-sulfur protein (ISP) in a mobile state, as revealed by the crystal structure of cyt bc 1 from the photosynthetic bacterium Rhodobacter sphaeroides in complex with the fungicide azoxystrobin. Unlike cyt bc 1 inhibitors stigmatellin and famoxadone that immobilize the ISP, azoxystrobin causes the ISP-ED to separate from the cyt b subunit and to remain in a mobile state. Analysis of anomalous scattering signals from the iron-sulfur cluster of the ISP suggests the existence of a trajectory for electron delivery. This work supports and solidifies the hypothesis that the bimodal conformation switch of the ISP provides a gating mechanism for bifurcated ET, which is essential to the Q-cycle mechanism of cyt bc 1 function.

    Organizational Affiliation: 

    Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892 xiad@mail.nih.gov.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 1, mitochondrialA446Bos taurusMutation(s): 0 
Gene Names: UQCRC1
Membrane Entity: Yes 
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 2, mitochondrialB439Bos taurusMutation(s): 0 
Gene Names: UQCRC2
Membrane Entity: Yes 
UniProt
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome bC379Bos taurusMutation(s): 0 
Gene Names: MT-CYB, COB, CYTB, MTCYB
Membrane Entity: Yes 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c1, heme protein, mitochondrialD241Bos taurusMutation(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, mitochondrialE196Bos taurusMutation(s): 0 
Gene Names: UQCRFS1
EC: 1.10.2.2 (PDB Primary Data), 7.1.1.8 (UniProt)
Membrane Entity: Yes 
UniProt
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 7F110Bos taurusMutation(s): 0 
Gene Names: UQCRB
Membrane Entity: Yes 
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 8G80Bos taurusMutation(s): 0 
Gene Names: UQCRQ
Membrane Entity: Yes 
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 6, mitochondrialH78Bos taurusMutation(s): 0 
Gene Names: UQCRH
Membrane Entity: Yes 
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrialI78Bos taurusMutation(s): 0 
Gene Names: UQCRFS1
EC: 1.10.2.2 (PDB Primary Data), 7.1.1.8 (UniProt)
Membrane Entity: Yes 
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 9J63Bos taurusMutation(s): 0 
Gene Names: UQCR10
Membrane Entity: Yes 
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 10K55Bos taurusMutation(s): 0 
Gene Names: UQCR11, UQCR
Membrane Entity: Yes 
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Small Molecules
Ligands 8 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL
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M [auth A],
S [auth D],
U [auth G]		CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L		 Ligand Interaction
8PE
Query on 8PE
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Q [auth C](2R)-3-{[(S)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}-2-(tetradecanoyloxy)propyl octadecanoate
C37 H74 N O8 P
RFJQNULIDFTTLL-PGUFJCEWSA-N		 Ligand Interaction
MC3
Query on MC3
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V [auth J]1,2-DIMYRISTOYL-RAC-GLYCERO-3-PHOSPHOCHOLINE
C36 H72 N O8 P
CITHEXJVPOWHKC-UUWRZZSWSA-N		 Ligand Interaction
HEC
Query on HEC
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R [auth D]HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N		 Ligand Interaction
HEM
Query on HEM
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N [auth C],
O [auth C]		PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L		 Ligand Interaction
6PE
Query on 6PE
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L [auth A],
W [auth K]		1,2-DIHEXANOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
C17 H33 N O8 P
PELYUHWUVHDSSU-OAHLLOKOSA-M		 Ligand Interaction
AZO
Query on AZO
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P [auth C]METHYL (2Z)-2-(2-{[6-(2-CYANOPHENOXY)PYRIMIDIN-4-YL]OXY}PHENYL)-3-METHOXYACRYLATE
C22 H17 N3 O5
WFDXOXNFNRHQEC-GHRIWEEISA-N		 Ligand Interaction
FES
Query on FES
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T [auth E]FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
AZO BindingDB:  6NHG Ki: 298 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.252 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 154.181α = 90
b = 154.181β = 90
c = 598.18γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-06-26
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-21
    Changes: Data collection, Database references