2KGK

Solution structure of Bacillus anthracis dihydrofolate reductase


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The solution structure of Bacillus anthracis dihydrofolate reductase yields insight into the analysis of structure-activity relationships for novel inhibitors.

Beierlein, J.M.Deshmukh, L.Frey, K.M.Vinogradova, O.Anderson, A.C.

(2009) Biochemistry 48: 4100-4108

  • DOI: 10.1021/bi802319w
  • Primary Citation of Related Structures:  
    2KGK

  • PubMed Abstract: 
  • There is a significant need for new therapeutics to treat infections caused by the biodefense agent Bacillus anthracis. In pursuit of drug discovery against this organism, we have developed novel propargyl-linked inhibitors that target the essential enzyme dihydrofolate reductase (DHFR) from B ...

    There is a significant need for new therapeutics to treat infections caused by the biodefense agent Bacillus anthracis. In pursuit of drug discovery against this organism, we have developed novel propargyl-linked inhibitors that target the essential enzyme dihydrofolate reductase (DHFR) from B. anthracis. Previously, we reported an initial series of these inhibitors and a high-resolution crystal structure of the ternary complex of the enzyme bound to its cofactor and one of the most potent inhibitors, UCP120B [Beierlein, J., Frey, K., Bolstad, D., Pelphrey, P., Joska, T., Smith, A., Priestley, N., Wright, D., and Anderson, A. (2008) J. Med. Chem. 51, 7532-7540]. Herein, we describe a three-dimensional solution structure of the ternary complex as determined by NMR. A comparison of this solution structure to the crystal structure reveals a general conservation of the DHFR fold and cofactor interactions as well as differences in the location of an active site helix and specific ligand interactions. In addition to data for the fully assigned ternary complex, data for the binary (enzyme-cofactor) complex were collected, providing chemical shift comparisons and revealing perturbations in residues that accommodate ligand binding. Dynamics of the protein, measured using (15)N T(1) and T(2) relaxation times and {(1)H}-(15)N heteronuclear NOEs, reveal residue flexibility at the active site that explains enzyme inhibition and structure-activity relationships for two different series of these propargyl-linked inhibitors. The information obtained from the solution structure regarding active site flexibility will be especially valuable in the design of inhibitors with increased potency.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dihydrofolate reductaseA172Bacillus anthracisMutation(s): 0 
Gene Names: dfrABAS2083BA_2237GBAA2237GBAA_2237
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / 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
 Ligand Interaction
N22
Query on N22

Download Ideal Coordinates CCD File 
C [auth A]5-[3-(2,5-dimethoxyphenyl)prop-1-yn-1-yl]-6-ethylpyrimidine-2,4-diamine
C17 H20 N4 O2
NNFDQABYXZBKRK-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
N22 BindingDB:  2KGK Ki: 300 (nM) from 1 assay(s)
IC50: 890 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2022-03-16
    Changes: Data collection, Database references, Derived calculations