Alternate Binding Modes Observed for the E- and Z-Isomers of 2,4-Diaminofuro[2,3-d]pyrimidines as Ternary Complexes with NADPH and Mouse Dihydrofolate Reductase

Experimental Data Snapshot

  • Resolution: 2.05 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 

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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Design, synthesis, and X-ray crystal structures of 2,4-diaminofuro[2,3-d]pyrimidines as multireceptor tyrosine kinase and dihydrofolate reductase inhibitors.

Gangjee, A.Li, W.Lin, L.Zeng, Y.Ihnat, M.Warnke, L.A.Green, D.W.Cody, V.Pace, J.Queener, S.F.

(2009) Bioorg Med Chem 17: 7324-7336

  • DOI: https://doi.org/10.1016/j.bmc.2009.08.044
  • Primary Citation of Related Structures:  
    3K45, 3K47

  • PubMed Abstract: 

    To optimize dual receptor tyrosine kinase (RTK) and dihydrofolate reductase (DHFR) inhibition, the E- and Z-isomers of 5-[2-(2-methoxyphenyl)prop-1-en-1-yl]furo[2,3-d]pyrimidine-2,4-diamines (1a and 1b) were separated by HPLC and the X-ray crystal structures (2.0 and 1.4A, respectively) with mouse DHFR and NADPH as well as 1b with human DHFR (1.5A) were determined. The E- and Z-isomers adopt different binding modes when bound to mouse DHFR. A series of 2,4-diaminofuro[2,3-d]pyrimidines 2-13 were designed and synthesized using the X-ray crystal structures of 1a and 1b with DHFR to increase their DHFR inhibitory activity. Wittig reactions of appropriate 2-methoxyphenyl ketones with 2,4-diamino-6-chloromethyl furo[2,3-d]pyrimidine afforded the C8-C9 unsaturated compounds 2-7 and catalytic reduction gave the saturated 8-13. Homologation of the C9-methyl analog maintains DHFR inhibitory activity. In addition, inhibition of EGFR and PDGFR-beta were discovered for saturated C9-homologated analogs 9 and 10 that were absent in the saturated C9-methyl analogs.

  • Organizational Affiliation

    Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA 15282, USA. gangjee@duq.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dihydrofolate reductase186Mus musculusMutation(s): 0 
Gene Names: Dhfr
UniProt & NIH Common Fund Data Resources
Find proteins for P00375 (Mus musculus)
Explore P00375 
Go to UniProtKB:  P00375
IMPC:  MGI:94890
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00375
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NDP

Download Ideal Coordinates CCD File 
C21 H30 N7 O17 P3
Query on D09

Download Ideal Coordinates CCD File 
B [auth A]5-[(1E)-2-(2-methoxyphenyl)prop-1-en-1-yl]furo[2,3-d]pyrimidine-2,4-diamine
C16 H16 N4 O2
Binding Affinity Annotations 
IDSourceBinding Affinity
D09 Binding MOAD:  3K47 IC50: 1.45e+4 (nM) from 1 assay(s)
BindingDB:  3K47 IC50: min: 1.45e+4, max: 1.85e+4 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.05 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.432α = 90
b = 61.012β = 117.79
c = 43.217γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Structure summary
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description