3DGA

Wild-type Plasmodium falciparum dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) complexed with RJF01302, NADPH, and dUMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Exploiting structural analysis, in silico screening, and serendipity to identify novel inhibitors of drug-resistant falciparum malaria.

Dasgupta, T.Chitnumsub, P.Kamchonwongpaisan, S.Maneeruttanarungroj, C.Nichols, S.E.Lyons, T.M.Tirado-Rives, J.Jorgensen, W.L.Yuthavong, Y.Anderson, K.S.

(2009) ACS Chem Biol 4: 29-40

  • DOI: 10.1021/cb8002804
  • Primary Citation of Related Structures:  
    3DGA, 3DG8

  • PubMed Abstract: 
  • Plasmodium falciparum thymidylate synthase-dihydrofolate reductase (TS-DHFR) is an essential enzyme in folate biosynthesis and a major malarial drug target. This bifunctional enzyme thus presents different design approaches for developing novel inhibitors against drug-resistant mutants ...

    Plasmodium falciparum thymidylate synthase-dihydrofolate reductase (TS-DHFR) is an essential enzyme in folate biosynthesis and a major malarial drug target. This bifunctional enzyme thus presents different design approaches for developing novel inhibitors against drug-resistant mutants. We performed a high-throughput in silico screen of a database of diverse, drug-like molecules against a non-active-site pocket of TS-DHFR. The top compounds from this virtual screen were evaluated by in vitro enzymatic and cellular culture studies. Three compounds active to 20 microM IC(50)'s in both wildtype and antifolate-resistant P. falciparum parasites were identified; moreover, no inhibition of human DHFR enzyme was observed, indicating that the inhibitory effects appeared to be parasite-specific. Notably, all three compounds had a biguanide scaffold. However, relative free energy of binding calculations suggested that the compounds might preferentially interact with the active site over the screened non-active-site region. To resolve the two possible modes of binding, co-crystallization studies of the compounds complexed with TS-DHFR enzyme were performed. Surprisingly, the structural analysis revealed that these novel, biguanide compounds do indeed bind at the active site of DHFR and additionally revealed the molecular basis by which they overcome drug resistance. To our knowledge, these are the first co-crystal structures of novel, biguanide, non-WR99210 compounds that are active against folate-resistant malaria parasites in cell culture.


    Organizational Affiliation

    Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06520, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional dihydrofolate reductase-thymidylate synthase AB280Plasmodium falciparumMutation(s): 0 
EC: 1.5.1.3 (PDB Primary Data), 2.1.1.45 (PDB Primary Data)
Find proteins for P13922 (Plasmodium falciparum (isolate K1 / Thailand))
Explore P13922 
Go to UniProtKB:  P13922
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional dihydrofolate reductase-thymidylate synthase CD328Plasmodium falciparumMutation(s): 0 
EC: 1.5.1.3 (PDB Primary Data), 2.1.1.45 (PDB Primary Data)
Find proteins for P13922 (Plasmodium falciparum (isolate K1 / Thailand))
Explore P13922 
Go to UniProtKB:  P13922
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP

Download Ideal Coordinates CCD File 
A, B
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
UMP
Query on UMP

Download Ideal Coordinates CCD File 
C, D
2'-DEOXYURIDINE 5'-MONOPHOSPHATE
C9 H13 N2 O8 P
JSRLJPSBLDHEIO-SHYZEUOFSA-N
 Ligand Interaction
RJ1
Query on RJ1

Download Ideal Coordinates CCD File 
A, B
N-[2-chloro-5-(trifluoromethyl)phenyl]imidodicarbonimidic diamide
C9 H9 Cl F3 N5
IGFTZEOFHWPCDL-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
RJ1IC50 :  29900   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.377α = 90
b = 156.015β = 90
c = 164.567γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description