4FGH

S. aureus dihydrofolate reductase co-crystallized with ethyl-DAP isobutenyl-dihydrophthalazine inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Inhibition of Bacterial Dihydrofolate Reductase by 6-Alkyl-2,4-diaminopyrimidines.

Nammalwar, B.Bourne, C.R.Bunce, R.A.Wakeham, N.Bourne, P.C.Ramnarayan, K.Mylvaganam, S.Berlin, K.D.Barrow, E.W.Barrow, W.W.

(2012) ChemMedChem 7: 1974-1982

  • DOI: https://doi.org/10.1002/cmdc.201200291
  • Primary Citation of Related Structures:  
    4FGG, 4FGH

  • PubMed Abstract: 

    (±)-6-Alkyl-2,4-diaminopyrimidine-based inhibitors of bacterial dihydrofolate reductase (DHFR) have been prepared and evaluated for biological potency against Bacillus anthracis and Staphylococcus aureus. Biological studies revealed attenuated activity relative to earlier structures lacking substitution at C6 of the diaminopyrimidine moiety, though minimum inhibitory concentration (MIC) values are in the 0.125-8 μg mL(-1) range for both organisms. This effect was rationalized from three- dimensional X-ray structure studies that indicate the presence of a side pocket containing two water molecules adjacent to the main binding pocket. Because of the hydrophobic nature of the substitutions at C6, the main interactions are with protein residues Leu 20 and Leu 28. These interactions lead to a minor conformational change in the protein, which opens the pocket containing these water molecules such that it becomes continuous with the main binding pocket. These water molecules are reported to play a critical role in the catalytic reaction, highlighting a new area for inhibitor expansion within the limited architectural variation at the catalytic site of bacterial DHFR.


  • Organizational Affiliation

    Department of Chemistry, Oklahoma State University, Stillwater, OK 74078 (USA).


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dihydrofolate reductase163Staphylococcus aureusMutation(s): 0 
Gene Names: DHFRfolA
EC: 1.5.1.3
UniProt
Find proteins for P0A017 (Staphylococcus aureus)
Explore P0A017 
Go to UniProtKB:  P0A017
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A017
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
B [auth A]NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
0U6
Query on 0U6

Download Ideal Coordinates CCD File 
C [auth A](2E)-3-{5-[(2,4-diamino-6-ethylpyrimidin-5-yl)methyl]-2,3-dimethoxyphenyl}-1-[(1S)-1-(2-methylprop-1-en-1-yl)phthalazin-2(1H)-yl]prop-2-en-1-one
C30 H34 N6 O3
CWIYQEZJRSEBAE-CJZRDCOESA-N
GOL
Query on GOL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.197 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.921α = 90
b = 78.921β = 90
c = 106.178γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-09
    Type: Initial release
  • Version 1.1: 2013-01-16
    Changes: Database references
  • Version 1.2: 2013-04-17
    Changes: Database references
  • Version 1.3: 2013-11-20
    Changes: Database references
  • Version 1.4: 2024-02-28
    Changes: Data collection, Database references, Derived calculations