6E0B

Plasmodium falciparum dihydroorotate dehydrogenase C276F mutant bound with triazolopyrimidine-based inhibitor DSM1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Identification and Mechanistic Understanding of Dihydroorotate Dehydrogenase Point Mutations in Plasmodium falciparum that Confer in Vitro Resistance to the Clinical Candidate DSM265.

White, J.Dhingra, S.K.Deng, X.El Mazouni, F.Lee, M.C.S.Afanador, G.A.Lawong, A.Tomchick, D.R.Ng, C.L.Bath, J.Rathod, P.K.Fidock, D.A.Phillips, M.A.

(2019) ACS Infect Dis 5: 90-101

  • DOI: https://doi.org/10.1021/acsinfecdis.8b00211
  • Primary Citation of Related Structures:  
    6E0B

  • PubMed Abstract: 

    Malaria is one of the most challenging human infectious diseases, and both prevention and control have been hindered by the development of Plasmodium falciparum resistance to existing therapies. Several new compounds with novel mechanisms are in clinical development for the treatment of malaria, including DSM265, an inhibitor of Plasmodium dihydroorotate dehydrogenase. To explore the mechanisms by which resistance might develop to DSM265 in the field, we selected for DSM265-resistant P. falciparum parasites in vitro. Any of five different amino acid changes led to reduced efficacy on the parasite and to decreased DSM265 binding to P. falciparum DHODH. The DSM265-resistant parasites retained full sensitivity to atovaquone. All but one of the observed mutations were in the DSM265 binding site, and the remaining C276F was in the adjacent flavin cofactor site. The C276F mutation was previously identified in a recrudescent parasite during a Phase IIa clinical study. We confirmed that this mutation (and the related C276Y) accounted for the full level of observed DSM265 resistance by regenerating the mutation using CRISPR/Cas9 genome editing. X-ray structure analysis of the C276F mutant enzyme showed that conformational changes of nearby residues were required to accommodate the larger F276 residue, which in turn led to a restriction in the size of the DSM265 binding pocket. These findings underscore the importance of developing DSM265 as part of a combination therapy with other agents for successful use against malaria.


  • Organizational Affiliation

    Departments of Chemistry and Global Health , University of Washington , 36 Bagley Hall, 400 15th Avenue NE , Seattle , Washington 98195 , United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dihydroorotate dehydrogenase (quinone), mitochondrial401Plasmodium falciparum 3D7Mutation(s): 1 
Gene Names: PFF0160c
EC: 1.3.5.2
Membrane Entity: Yes 
UniProt
Find proteins for Q08210 (Plasmodium falciparum (isolate 3D7))
Explore Q08210 
Go to UniProtKB:  Q08210
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ08210
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download Ideal Coordinates CCD File 
C [auth A]FLAVIN MONONUCLEOTIDE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
JZ8
Query on JZ8

Download Ideal Coordinates CCD File 
B [auth A]5-methyl-7-(naphthalen-2-ylamino)-1H-[1,2,4]triazolo[1,5-a]pyrimidine-3,8-diium
C16 H15 N5
GNJXIZOPHGMAQW-UHFFFAOYSA-P
LDA
Query on LDA

Download Ideal Coordinates CCD File 
H [auth A]LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
ORO
Query on ORO

Download Ideal Coordinates CCD File 
D [auth A]OROTIC ACID
C5 H4 N2 O4
PXQPEWDEAKTCGB-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.522α = 90
b = 85.522β = 90
c = 138.879γ = 120
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI103947

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-14
    Type: Initial release
  • Version 1.1: 2019-05-01
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description