1TSL

L. CASEI THYMIDYLATE SYNTHASE WITH SPECIES SPECIFIC INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.163 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure-based design of inhibitors specific for bacterial thymidylate synthase.

Stout, T.J.Tondi, D.Rinaldi, M.Barlocco, D.Pecorari, P.Santi, D.V.Kuntz, I.D.Stroud, R.M.Shoichet, B.K.Costi, M.P.

(1999) Biochemistry 38: 1607-1617

  • DOI: 10.1021/bi9815896
  • Primary Citation of Related Structures:  
    1TSM, 1TSL

  • PubMed Abstract: 
  • Thymidylate synthase is an attractive target for antiproliferative drug design because of its key role in the synthesis of DNA. As such, the enzyme has been widely targeted for anticancer applications. In principle, TS should also be a good target fo ...

    Thymidylate synthase is an attractive target for antiproliferative drug design because of its key role in the synthesis of DNA. As such, the enzyme has been widely targeted for anticancer applications. In principle, TS should also be a good target for drugs used to fight infectious disease. In practice, TS is highly conserved across species, and it has proven to be difficult to develop inhibitors that are selective for microbial TS enzymes over the human enzyme. Using the structure of TS from Lactobacillus casei in complex with the nonsubstrate analogue phenolphthalein, inhibitors were designed to take advantage of features of the bacterial enzyme that differ from those of the human enzyme. Upon synthesis and testing, these inhibitors were found to be up to 40-fold selective for the bacterial enzyme over the human enzyme. The crystal structures of two of these inhibitors in complex with TS suggested the design of further compounds. Subsequent synthesis and testing showed that these second-round compounds inhibit the bacterial enzyme at sub-micromolar concentrations, while the human enzyme was not inhibited at detectable levels (selectivities of 100-1000-fold or greater). Although these inhibitors share chemical similarities, X-ray crystal structures reveal that the analogues bind to the enzyme in substantially different orientations. Site-directed mutagenesis experiments suggest that the individual inhibitors may adopt multiple configurations in their complexes with TS.


    Organizational Affiliation

    Department of Biochemistry, University of California, San Francisco 94143-0448, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THYMIDYLATE SYNTHASEA316Lactobacillus caseiMutation(s): 0 
Gene Names: thyA
EC: 2.1.1.45
Find proteins for P00469 (Lactobacillus casei)
Explore P00469 
Go to UniProtKB:  P00469
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A15
Query on A15

Download CCD File 
A
3'-3"-DICHLOROPHENOL-1,8-3H-BENZO[DE]ISOCHROMEN-1-ONE
C24 H14 Cl2 O4
HCQHFJBXXMFZHF-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
A15Ki:  700   nM  BindingDB
A15Ki:  700   nM  Binding MOAD
A15Ki :  700   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.163 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.3α = 90
b = 78.3β = 90
c = 243.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
MSCdata reduction
MSCdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-06-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance