7R3V

Crystal structure of bovine Cytochrome bc1 in complex with inhibitor CK-2-67.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.208 

Starting Model: experimental
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Ligand Structure Quality Assessment 


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Literature

Targeting the Ubiquinol-Reduction (Q i ) Site of the Mitochondrial Cytochrome bc 1 Complex for the Development of Next Generation Quinolone Antimalarials.

Amporndanai, K.Pinthong, N.O'Neill, P.M.Hong, W.D.Amewu, R.K.Pidathala, C.Berry, N.G.Leung, S.C.Ward, S.A.Biagini, G.A.Hasnain, S.S.Antonyuk, S.V.

(2022) Biology (Basel) 11

  • DOI: https://doi.org/10.3390/biology11081109
  • Primary Citation of Related Structures:  
    7R3V

  • PubMed Abstract: 

    Antimalarials targeting the ubiquinol-oxidation (Q o ) site of the Plasmodium falciparum bc 1 complex, such as atovaquone, have become less effective due to the rapid emergence of resistance linked to point mutations in the Q o site. Recent findings showed a series of 2-aryl quinolones mediate inhibitions of this complex by binding to the ubiquinone-reduction (Qi) site, which offers a potential advantage in circumventing drug resistance. Since it is essential to understand how 2-aryl quinolone lead compounds bind within the Qi site, here we describe the co-crystallization and structure elucidation of the bovine cytochrome bc 1 complex with three different antimalarial 4(1H)-quinolone sub-types, including two 2-aryl quinolone derivatives and a 3-aryl quinolone analogue for comparison. Currently, no structural information is available for Plasmodial cytochrome bc 1 . Our crystallographic studies have enabled comparison of an in-silico homology docking model of P. falciparum with the mammalian's equivalent, enabling an examination of how binding compares for the 2- versus 3-aryl analogues. Based on crystallographic and computational modeling, key differences in human and P. falciparum Q i sites have been mapped that provide new insights that can be exploited for the development of next-generation antimalarials with greater selective inhibitory activity against the parasite bc 1 with improved antimalarial properties.


  • Organizational Affiliation

    Molecular Biophysics Group, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool L69 7ZB, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 1, mitochondrial445Bos taurusMutation(s): 0 
UniProt
Find proteins for P31800 (Bos taurus)
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 2, mitochondrial418Bos taurusMutation(s): 0 
UniProt
Find proteins for P23004 (Bos taurus)
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b379Bos taurusMutation(s): 0 
UniProt
Find proteins for P00157 (Bos taurus)
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c1, heme protein, mitochondrial239Bos taurusMutation(s): 0 
EC: 7.1.1.8
UniProt
Find proteins for P00125 (Bos taurus)
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrial196Bos taurusMutation(s): 0 
EC: 7.1.1.8
UniProt
Find proteins for P13272 (Bos taurus)
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 799Bos taurusMutation(s): 0 
UniProt
Find proteins for P00129 (Bos taurus)
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 874Bos taurusMutation(s): 0 
UniProt
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 6, mitochondrial65Bos taurusMutation(s): 0 
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit Rieske, mitochondrial46Bos taurusMutation(s): 0 
EC: 7.1.1.8
UniProt
Find proteins for P13272 (Bos taurus)
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome b-c1 complex subunit 959Bos taurusMutation(s): 0 
UniProt
Find proteins for P00130 (Bos taurus)
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  • Reference Sequence
Small Molecules
Ligands 12 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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GA [auth G],
M [auth A],
Z [auth D]
CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
PEE
Query on PEE

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DA [auth E],
S [auth C]
1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
C41 H78 N O8 P
MWRBNPKJOOWZPW-NYVOMTAGSA-N
PX4
Query on PX4

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BA [auth E]1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C36 H73 N O8 P
CITHEXJVPOWHKC-UUWRZZSWSA-O
HEC
Query on HEC

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

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P [auth C]DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
6PE
Query on 6PE

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L [auth A]1,2-DIHEXANOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
C17 H33 N O8 P
PELYUHWUVHDSSU-OAHLLOKOSA-M
I2Q (Subject of Investigation/LOI)
Query on I2Q

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T [auth C]3-methyl-2-[4-[[4-(trifluoromethoxy)phenyl]methyl]phenyl]-1H-quinolin-4-one
C24 H18 F3 N O2
AYYGEPUZBKGCLO-UHFFFAOYSA-N
PG4
Query on PG4

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K [auth A],
Q [auth C],
R [auth C]
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
FES
Query on FES

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AA [auth E]FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
PO4
Query on PO4

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CA [auth E]
EA [auth F]
FA [auth F]
HA [auth G]
IA [auth G]
CA [auth E],
EA [auth F],
FA [auth F],
HA [auth G],
IA [auth G],
JA [auth G],
V [auth C],
W [auth C],
Y [auth D]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
DMS
Query on DMS

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U [auth C]DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.208 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 209.589α = 90
b = 209.589β = 90
c = 342.429γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-10
    Type: Initial release
  • Version 2.0: 2024-01-31
    Changes: Data collection, Non-polymer description, Refinement description