1P84

HDBT inhibited Yeast Cytochrome bc1 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the yeast cytochrome bc1 complex with a hydroxyquinone anion Qo site inhibitor bound

Palsdottir, H.Lojero, C.G.Trumpower, B.L.Hunte, C.

(2003) J.Biol.Chem. 278: 31303-31311

  • DOI: 10.1074/jbc.M302195200

  • PubMed Abstract: 
  • Bifurcated electron transfer during ubiquinol oxidation is the key reaction of cytochrome bc1 complex catalysis. Binding of the competitive inhibitor 5-n-heptyl-6-hydroxy-4,7-dioxobenzothiazole to the Qo site of the cytochrome bc1 complex from Saccha ...

    Bifurcated electron transfer during ubiquinol oxidation is the key reaction of cytochrome bc1 complex catalysis. Binding of the competitive inhibitor 5-n-heptyl-6-hydroxy-4,7-dioxobenzothiazole to the Qo site of the cytochrome bc1 complex from Saccharomyces cerevisiae was analyzed by x-ray crystallography. This alkylhydroxydioxobenzothiazole is bound in its ionized form as evident from the crystal structure and confirmed by spectroscopic analysis, consistent with a measured pKa = 6.1 of the hydroxy group in detergent micelles. Stabilizing forces for the hydroxyquinone anion inhibitor include a polarized hydrogen bond to the iron-sulfur cluster ligand His181 and on-edge interactions via weak hydrogen bonds with cytochrome b residue Tyr279. The hydroxy group of the latter contributes to stabilization of the Rieske protein in the b-position by donating a hydrogen bond. The reported pH dependence of inhibition with lower efficacy at alkaline pH is attributed to the protonation state of His181 with a pKa of 7.5. Glu272, a proposed primary ligand and proton acceptor of ubiquinol, is not bound to the carbonyl group of the hydroxydioxobenzothiazole ring but is rotated out of the binding pocket toward the heme bL propionate A, to which it is hydrogen-bonded via a single water molecule. The observed hydrogen bonding pattern provides experimental evidence for the previously proposed proton exit pathway involving the heme propionate and a chain of water molecules. Binding of the alkyl-6-hydroxy-4,7-dioxobenzothiazole is discussed as resembling an intermediate step of ubiquinol oxidation, supporting a single occupancy model at the Qo site.


    Organizational Affiliation

    Abt. Molekulare Membranbiologie, Max-Planck-Institut für Biophysik, Marie-Curie-Strasse 15, D-60439 Frankfurt, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex core protein I
A
431Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: COR1 (QCR1)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P07256 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P07256
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex core protein 2
B
352Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: QCR2 (COR2, UCR2)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P07257 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P07257
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
cytochrome b
C
385Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: COB (CYTB)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P00163 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P00163
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c1, heme protein
D
246Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: CYT1 (CTC1)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P07143 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P07143
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase iron-sulfur subunit
E
185Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: RIP1
EC: 7.1.1.8
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P08067 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P08067
Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex 17 kDa protein
F
74Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: QCR6 (UCR6)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P00127 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P00127
Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex 14 kDa protein
G
125Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: QCR7 (CRO1, UCR7)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P00128 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P00128
Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex ubiquinone-binding protein QP-C
H
93Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: QCR8
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P08525 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P08525
Entity ID: 9
MoleculeChainsSequence LengthOrganismDetails
Ubiquinol-cytochrome C reductase complex 7.3 kDa protein
I
55Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: QCR9 (UCR9)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex III (Cytochrome bc1)
Protein: 
Cytochrome bc1
Find proteins for P22289 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P22289
Entity ID: 10
MoleculeChainsSequence LengthOrganismDetails
Heavy Chain (Vh) Of Fv-Fragment
J
127N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 11
MoleculeChainsSequence LengthOrganismDetails
Light Chain (Vl) Of Fv-Fragment
K
107N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 9 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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Download CCD File 
D
CARDIOLIPIN
DIPHOSPHATIDYL GLYCEROL; BIS-(1,2-DIACYL-SN-GLYCERO-3-PHOSPHO)-1',3'-SN-GLYCEROL
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
 Ligand Interaction
PC1
Query on PC1

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Download CCD File 
D
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
3-SN-PHOSPHATIDYLCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N
 Ligand Interaction
DBT
Query on DBT

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Download CCD File 
C
5-HEPTYL-6-HYDROXY-1,3-BENZOTHIAZOLE-4,7-DIONE
C14 H17 N O3 S
CAPIRLKYURUNFL-UHFFFAOYSA-N
 Ligand Interaction
FES
Query on FES

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Download CCD File 
E
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
 Ligand Interaction
3PH
Query on 3PH

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Download CCD File 
A, D
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE
PHOSPHATIDIC ACID
C39 H77 O8 P
YFWHNAWEOZTIPI-DIPNUNPCSA-N
 Ligand Interaction
UMQ
Query on UMQ

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Download CCD File 
A
UNDECYL-MALTOSIDE
UNDECYL-BETA-D-MALTOPYRANOSIDE
C23 H44 O11
UYEMNFYVTFDKRG-ZNGNCRBCSA-N
 Ligand Interaction
HEM
Query on HEM

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Download CCD File 
C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
3PE
Query on 3PE

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Download CCD File 
C
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
3-SN-PHOSPHATIDYLETHANOLAMINE
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
 Ligand Interaction
UQ6
Query on UQ6

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Download CCD File 
C
5-(3,7,11,15,19,23-HEXAMETHYL-TETRACOSA-2,6,10,14,18,22-HEXAENYL)-2,3-DIMETHOXY-6-METHYL-BENZENE-1,4-DIOL
C39 H60 O4
DYOSCPIQEYRQEO-XQCASOQKSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.228 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 214.998α = 90.00
b = 165.091β = 117.33
c = 147.525γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-07-29
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-25
    Type: Advisory, Derived calculations