4CQA

Plasmodium falciparum dihydroorotate dehydrogenase (DHODH) in complex with IDI-6273


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

In Vitro Resistance Selections for Plasmodium Falciparum Dihydroorotate Dehydrogenase Inhibitors Give Mutants with Multiple Point Mutations in the Drug-Binding Site and Altered Growth.

Ross, L.S.Javier Gamo, F.Lafuente-Monasterio, M.J.E.Singh, O.M.P.Rowland, P.Wiegand, R.C.Wirth, D.F.

(2014) J.Biol.Chem. 289: 17980

  • DOI: 10.1074/jbc.M114.558353
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Malaria is a preventable and treatable disease; yet half of the world's population lives at risk of infection, and an estimated 660,000 people die of malaria-related causes every year. Rising drug resistance threatens to make malaria untreatable, nec ...

    Malaria is a preventable and treatable disease; yet half of the world's population lives at risk of infection, and an estimated 660,000 people die of malaria-related causes every year. Rising drug resistance threatens to make malaria untreatable, necessitating both the discovery of new antimalarial agents and the development of strategies to identify and suppress the emergence and spread of drug resistance. We focused on in-development dihydroorotate dehydrogenase (DHODH) inhibitors. Characterizing resistance pathways for antimalarial agents not yet in clinical use will increase our understanding of the potential for resistance. We identified resistance mechanisms of Plasmodium falciparum (Pf) DHODH inhibitors via in vitro resistance selections. We found 11 point mutations in the PfDHODH target. Target gene amplification and unknown mechanisms also contributed to resistance, albeit to a lesser extent. These mutant parasites were often hypersensitive to other PfDHODH inhibitors, which immediately suggested a novel combination therapy approach to preventing resistance. Indeed, a combination of wild-type and mutant-type selective inhibitors led to resistance far less often than either drug alone. The effects of point mutations in PfDHODH were corroborated with purified recombinant wild-type and mutant-type PfDHODH proteins, which showed the same trends in drug response as the cognate cell lines. Comparative growth assays demonstrated that two mutant parasites grew less robustly than their wild-type parent, and the purified protein of those mutants showed a decrease in catalytic efficiency, thereby suggesting a reason for the diminished growth rate. Co-crystallography of PfDHODH with three inhibitors suggested that hydrophobic interactions are important for drug binding and selectivity.


    Organizational Affiliation

    From the Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDROOROTATE DEHYDROGENASE
A, B
401Plasmodium falciparum (isolate 3D7)Mutation(s): 0 
EC: 1.3.5.2
Find proteins for Q08210 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q08210
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download SDF File 
Download CCD File 
A, B
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
ID6
Query on ID6

Download SDF File 
Download CCD File 
A, B
2-(4-chlorobenzyl)-8-ethoxy-1,3-dimethylcyclohepta[c]pyrrol-4(2H)-one
C20 H20 Cl N O2
PTQJXFLYSQXYEP-UHFFFAOYSA-N
 Ligand Interaction
ORO
Query on ORO

Download SDF File 
Download CCD File 
A, B
OROTIC ACID
C5 H4 N2 O4
PXQPEWDEAKTCGB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.950α = 90.00
b = 166.410β = 107.91
c = 63.160γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2014-02-12 
  • Released Date: 2014-04-30 
  • Deposition Author(s): Rowland, P.

Revision History 

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-05-14
    Type: Database references
  • Version 1.2: 2014-08-13
    Type: Database references
  • Version 1.3: 2019-03-06
    Type: Data collection, Experimental preparation, Other