2BLB

X-ray crystal structure of Plasmodium vivax dihydrofolate reductase in complex with pyrimethamine and its derivative

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Crystal Structure of Dihydrofolate Reductase from Plasmodium Vivax: Pyrimethamine Displacement Linked with Mutation-Induced Resistance.

Kongsaeree, P., Khongsuk, P., Leartsakulpanich, U., Chitnumsub, P., Tarnchompoo, B., Walkinshaw, M.D., Yuthavong, Y.

(2005) Proc Natl Acad Sci U S A 102: 13046

  • DOI: 10.1073/pnas.0501747102
  • Primary Citation of Related Structures:  
    2BL9, 2BLA, 2BLB, 2BLC

  • PubMed Abstract: 

    • Pyrimethamine (Pyr) targets dihydrofolate reductase of Plasmodium vivax (PvDHFR) as well as other malarial parasites, but its use as antimalarial is hampered by the widespread high resistance. Comparison of the crystal structures of PvDHFR from wild-type and the Pyr-resistant (SP21, Ser-58 --> Arg + Ser-117 --> Asn) strain as complexes with NADPH and Pyr or its analog lacking p-Cl (Pyr20) clearly shows that the steric conflict arising from the side chain of Asn-117 in the mutant enzyme, accompanied by the loss of binding to Ser-120, is mainly responsible for the reduction in binding of Pyr ...

    Pyrimethamine (Pyr) targets dihydrofolate reductase of Plasmodium vivax (PvDHFR) as well as other malarial parasites, but its use as antimalarial is hampered by the widespread high resistance. Comparison of the crystal structures of PvDHFR from wild-type and the Pyr-resistant (SP21, Ser-58 --> Arg + Ser-117 --> Asn) strain as complexes with NADPH and Pyr or its analog lacking p-Cl (Pyr20) clearly shows that the steric conflict arising from the side chain of Asn-117 in the mutant enzyme, accompanied by the loss of binding to Ser-120, is mainly responsible for the reduction in binding of Pyr. Pyr20 still effectively inhibits both the wild-type and SP21 proteins, and the x-ray structures of these complexes show how Pyr20 fits into both active sites without steric strain. These structural insights suggest a general approach for developing new generations of antimalarial DHFR inhibitors that, by only occupying substrate space of the active site, would retain binding affinity with the mutant enzymes.

    Organizational Affiliation: 

    Department of Chemistry and Center for Protein Structure and Function, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DIHYDROFOLATE REDUCTASE-THYMIDYLATE SYNTHASEA238Plasmodium vivaxMutation(s): 0 
EC: 1.5.1.3 (PDB Primary Data), 2.1.1.45 (UniProt)
UniProt
Find proteins for O02604 (Plasmodium vivax)
Explore O02604 
Go to UniProtKB:  O02604
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO02604
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP
Download Ideal Coordinates CCD File 
B [auth A]NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N		 Ligand Interaction
CP7
Query on CP7
Download Ideal Coordinates CCD File 
C [auth A]6-ETHYL-5-PHENYLPYRIMIDINE-2,4-DIAMINE
C12 H14 N4
XREDUPOVEQDQQS-UHFFFAOYSA-N		 Ligand Interaction
MES
Query on MES
Download Ideal Coordinates CCD File 
D [auth A]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
CP7 BindingDB:  2BLB Ki: min: 0.03, max: 0.08 (nM) from 2 assay(s)
IC50: min: 1520, max: 1820 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.48α = 90
b = 55.57β = 106.76
c = 45.27γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-06-28
    Changes: Data collection