3IK0

Lactobacillus casei Thymidylate Synthase in Ternary Complex with dUMP and the Phtalimidic Derivative 7C1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Identification of the binding modes of N-phenylphthalimides inhibiting bacterial thymidylate synthase through X-ray crystallography screening

Mangani, S.Cancian, L.Leone, R.Pozzi, C.Lazzari, S.Luciani, R.Ferrari, S.Costi, M.P.

(2011) J.Med.Chem. 54: 5454-5467

  • DOI: 10.1021/jm2005018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • To identify specific bacterial thymidylate synthase (TS) inhibitors, we exploited phenolphthalein (PTH), which inhibits both bacterial and human enzymes. The X-ray crystal structure of Lactobacillus casei TS (LcTS) that binds PTH showed multiple bind ...

    To identify specific bacterial thymidylate synthase (TS) inhibitors, we exploited phenolphthalein (PTH), which inhibits both bacterial and human enzymes. The X-ray crystal structure of Lactobacillus casei TS (LcTS) that binds PTH showed multiple binding modes of the inhibitor, which prevented a classical structure-based drug design approach. To overcome this issue, we synthesized two phthalimidic libraries that were tested against TS enzymes and then we performed X-ray crystallographic screening of the active compounds. Compounds 6A, 8A, and 12A showed 40-fold higher affinity for bacterial TS than human TS. The X-ray crystallographic screening characterized the binding mode of six inhibitors in complexes with LcTS. Of these, 20A, 23A, and 24A showed a common unique binding mode, whereas 8A showed a different, unique binding mode. A comparative analysis of the LcTS X-ray complexes that were obtained with the pathogenic TS enabled the selection of compounds 8A and 23A as specific compounds and starting points to be exploited for the specific inhibition of pathogen enzymes.


    Organizational Affiliation

    Dipartimento di Scienze Farmaceutiche, Università degli Studi di Modena e Reggio Emilia, Modena, Italy. mangani@unisi.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thymidylate synthase
A
316Lactobacillus caseiMutation(s): 0 
Gene Names: thyA
EC: 2.1.1.45
Find proteins for P00469 (Lactobacillus casei)
Go to UniProtKB:  P00469
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
7C1
Query on 7C1

Download SDF File 
Download CCD File 
A
4-(4-methyl-1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)benzenecarboximidamide
4-(4-methyl-1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)benzene-1-carboximidamide
C16 H13 N3 O2
KDWKLFURLBISCV-UHFFFAOYSA-N
 Ligand Interaction
UMP
Query on UMP

Download SDF File 
Download CCD File 
A
2'-DEOXYURIDINE 5'-MONOPHOSPHATE
DUMP
C9 H13 N2 O8 P
JSRLJPSBLDHEIO-SHYZEUOFSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
7C1Ki: 9000 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.206 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 78.197α = 90.00
b = 78.197β = 90.00
c = 226.663γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
MOSFLMdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-07-24
    Type: Database references