1X8R

EPSPS liganded with the (S)-phosphonate analog of the tetrahedral reaction intermediate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Interaction of phosphonate analogues of the tetrahedral reaction intermediate with 5-enolpyruvylshikimate-3-phosphate synthase in atomic detail.

Priestman, M.A.Healy, M.L.Becker, A.Alberg, D.G.Bartlett, P.A.Lushington, G.H.Schonbrunn, E.

(2005) Biochemistry 44: 3241-3248

  • DOI: 10.1021/bi048198d
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) catalyzes the penultimate step of the shikimate pathway and is the target of the broad-spectrum herbicide glyphosate. Since the functionality of the shikimate pathway is vital not only fo ...

    The enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) catalyzes the penultimate step of the shikimate pathway and is the target of the broad-spectrum herbicide glyphosate. Since the functionality of the shikimate pathway is vital not only for plants but also for microorganisms, EPSPS is considered a prospective target for the development of novel antibiotics. We have kinetically analyzed and determined the crystal structures of Escherichia coli EPSPS inhibited by (R)- and (S)-configured phosphonate analogues of the tetrahedral reaction intermediate. Both diastereomers are competitive inhibitors with respect to the substrates of the EPSPS reaction, shikimate-3-phosphate (S3P) and phosphoenolpyruvate (PEP). Remarkably, the (S)-phosphonate (K(iS3P) = 750 nM), whose configuration corresponds to that of the genuine tetrahedral intermediate, is a much weaker inhibitor than the (R)-phosphonate analogue (K(iS3P) = 16 nM). The crystal structures of EPSPS liganded with the (S)- and (R)-phosphonates, at 1.5 and 1.9 A resolution, respectively, revealed that binding of the (R)-phosphonate induces conformational changes of the strictly conserved residues Arg124 and Glu341 within the active site. This appears to give rise to substantial structural alterations in the amino-terminal globular domain of the enzyme. By contrast, binding of the (S)-phosphonate renders the enzyme structure unchanged. Thus, EPSPS may facilitate the tight binding of structurally diverse ligands through conformational flexibility. Molecular docking calculations did not explain why the (R)-phosphonate is the better inhibitor. Therefore, we propose that the structural events during the open-closed transition of EPSPS are altered as a result of inhibitor action.


    Organizational Affiliation

    Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-phosphoshikimate 1-carboxyvinyltransferase
A
427Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: aroA
EC: 2.5.1.19
Find proteins for P0A6D3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6D3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMT
Query on FMT

Download SDF File 
Download CCD File 
A
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
SC1
Query on SC1

Download SDF File 
Download CCD File 
A
[3R-[3A,4A,5B(S*)]]-5-(1-CARBOXY-1-PHOSPHONOETHOXY)-4-HYDROXY-3-(PHOSPHONOOXY)-1-CYCLOHEXENE-1-CARBOXYLIC ACID
C10 H16 O13 P2
HUOJJMMXOWLGJU-JQCUSGDOSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SC1Ki: 15 nM (100) BINDINGDB
SC1Kd: 15 nM (100) BINDINGDB
SC1Ki: ~2900 nM BINDINGMOAD
SC1Ki: 750 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 57.730α = 90.00
b = 85.170β = 90.00
c = 87.490γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-04-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description