4IXE

pcDHFR-NADPH-270


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Design, Synthesis, and Molecular Modeling of Novel Pyrido[2,3-d]pyrimidine Analogues As Antifolates; Application of Buchwald-Hartwig Aminations of Heterocycles.

Gangjee, A.Namjoshi, O.A.Raghavan, S.Queener, S.F.Kisliuk, R.L.Cody, V.

(2013) J Med Chem 56: 4422-4441

  • DOI: 10.1021/jm400086g
  • Primary Citation of Related Structures:  
    4IXE, 4IXF, 4IXG

  • PubMed Abstract: 
  • Opportunistic infections caused by Pneumocystis jirovecii (P. jirovecii, pj), Toxoplasma gondii (T. gondii, tg), and Mycobacterium avium (M. avium, ma) are the principal causes of morbidity and mortality in patients with acquired immunodeficiency syndrome (AIDS) ...

    Opportunistic infections caused by Pneumocystis jirovecii (P. jirovecii, pj), Toxoplasma gondii (T. gondii, tg), and Mycobacterium avium (M. avium, ma) are the principal causes of morbidity and mortality in patients with acquired immunodeficiency syndrome (AIDS). The absence of any animal models for human Pneumocystis jirovecii pneumonia and the lack of crystal structures of pjDHFR and tgDHFR make the design of inhibitors challenging. A novel series of pyrido[2,3-d]pyrimidines as selective and potent DHFR inhibitors against these opportunistic infections are presented. Buchwald-Hartwig coupling reaction of substituted anilines with pivaloyl protected 2,4-diamino-6-bromo-pyrido[2,3-d]pyrimidine was successfully explored to synthesize these analogues. Compound 26 was the most selective inhibitor with excellent potency against pjDHFR. Molecular modeling studies with a pjDHFR homology model explained the potency and selectivity of 26. Structural data are also reported for 26 with pcDHFR and 16 and 22 with variants of pcDHFR.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dihydrofolate reductaseA [auth D]206Pneumocystis cariniiMutation(s): 0 
EC: 1.5.1.3
UniProt
Find proteins for P16184 (Pneumocystis carinii)
Explore P16184 
Go to UniProtKB:  P16184
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP (Subject of Investigation/LOI)
Query on NDP

Download Ideal Coordinates CCD File 
C [auth D]NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
IXE (Subject of Investigation/LOI)
Query on IXE

Download Ideal Coordinates CCD File 
B [auth D]N~6~-methyl-N~6~-(3,4,5-trifluorophenyl)pyrido[2,3-d]pyrimidine-2,4,6-triamine
C14 H11 F3 N6
RYXUPKGYPPPMSC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.708α = 90
b = 42.719β = 93.59
c = 58.481γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
MOLREPphasing
REFMACrefinement
XDSdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2013-01-25 
  • Released Date: 2013-05-29 
  • Deposition Author(s): Cody, V.

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-07-10
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description