3E0B

Bacillus anthracis Dihydrofolate Reductase complexed with NADPH and 2,4-diamino-5-(3-(2,5-dimethoxyphenyl)prop-1-ynyl)-6-ethylpyrimidine (UCP120B)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Synthetic and Crystallographic Studies of a New Inhibitor Series Targeting Bacillus anthracis Dihydrofolate Reductase

Beierlein, J.M.Frey, K.M.Bolstad, D.B.Pelphrey, P.M.Joska, T.M.Smith, A.E.Priestley, N.D.Wright, D.L.Anderson, A.C.

(2008) J Med Chem 51: 7532-7540

  • DOI: https://doi.org/10.1021/jm800776a
  • Primary Citation of Related Structures:  
    3E0B

  • PubMed Abstract: 

    Bacillus anthracis, the causative agent of anthrax, poses a significant biodefense danger. Serious limitations in approved therapeutics and the generation of resistance have produced a compelling need for new therapeutic agents against this organism. Bacillus anthracis is known to be insensitive to the clinically used antifolate, trimethoprim, because of a lack of potency against the dihydrofolate reductase enzyme. Herein, we describe a novel lead series of B. anthracis dihydrofolate reductase inhibitors characterized by an extended trimethoprim-like scaffold. The best lead compound adds only 22 Da to the molecular weight and is 82-fold more potent than trimethoprim. An X-ray crystal structure of this lead compound bound to B. anthracis dihydrofolate reductase in the presence of NADPH was determined to 2.25 A resolution. The structure reveals several features that can be exploited for further development of this lead series.


  • Organizational Affiliation

    Department of Pharmaceutical Sciences, University of Connecticut, 69 N. Eagleville Road, Storrs, Connecticut 06269, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dihydrofolate reductase
A, B
166Bacillus anthracisMutation(s): 1 
Gene Names: dfrABAS2083BA_2237GBAA2237
EC: 1.5.1.3
UniProt
Find proteins for Q81R22 (Bacillus anthracis)
Explore Q81R22 
Go to UniProtKB:  Q81R22
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ81R22
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
N22 BindingDB:  3E0B Ki: 300 (nM) from 1 assay(s)
IC50: 890 (nM) from 1 assay(s)
Binding MOAD:  3E0B IC50: 890 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 42
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.416α = 90
b = 78.416β = 90
c = 67.092γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CBASSdata collection
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-11-20
    Changes: Non-polymer description
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-11-01
    Changes: Data collection, Refinement description