3FJX

E. coli EPSP synthase (T97I) liganded with S3P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis of Glyphosate Resistance Resulting from the Double Mutation Thr97 -> Ile and Pro101 -> Ser in 5-Enolpyruvylshikimate-3-phosphate Synthase from Escherichia coli.

Funke, T.Yang, Y.Han, H.Healy-Fried, M.Olesen, S.Becker, A.Schonbrunn, E.

(2009) J.Biol.Chem. 284: 9854-9860

  • DOI: 10.1074/jbc.M809771200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The shikimate pathway enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) is the target of the broad spectrum herbicide glyphosate. The genetic engineering of EPSPS led to the introduction of glyphosate-resistant crops worldwide. The genetical ...

    The shikimate pathway enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) is the target of the broad spectrum herbicide glyphosate. The genetic engineering of EPSPS led to the introduction of glyphosate-resistant crops worldwide. The genetically engineered corn lines NK603 and GA21 carry distinct EPSPS enzymes. CP4 EPSPS, expressed in NK603 corn and transgenic soybean, cotton, and canola, belongs to class II EPSPS, glyphosate-insensitive variants of this enzyme isolated from certain Gram-positive bacteria. GA21 corn, on the other hand, was created by point mutations of class I EPSPS, such as the enzymes from Zea mays or Escherichia coli, which are sensitive to low glyphosate concentrations. The structural basis of the glyphosate resistance resulting from these point mutations has remained obscure. We studied the kinetic and structural effects of the T97I/P101S double mutation, the molecular basis for GA21 corn, using EPSPS from E. coli. The T97I/P101S enzyme is essentially insensitive to glyphosate (K(i) = 2.4 mm) but maintains high affinity for the substrate phosphoenolpyruvate (PEP) (K(m) = 0.1 mm). The crystal structure at 1.7-A resolution revealed that the dual mutation causes a shift of residue Gly(96) toward the glyphosate binding site, impairing efficient binding of glyphosate, while the side chain of Ile(97) points away from the substrate binding site, facilitating PEP utilization. The single site T97I mutation renders the enzyme sensitive to glyphosate and causes a substantial decrease in the affinity for PEP. Thus, only the concomitant mutations of Thr(97) and Pro(101) induce the conformational changes necessary to produce catalytically efficient, glyphosate-resistant class I EPSPS.


    Organizational Affiliation

    Drug Discovery Department, Moffitt Cancer Center & Research Institute, Tampa, Florida 33612, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-phosphoshikimate 1-carboxyvinyltransferase
A
427Escherichia coli (strain K12)Mutation(s): 1 
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
S3P
Query on S3P

Download SDF File 
Download CCD File 
A
SHIKIMATE-3-PHOSPHATE
C7 H11 O8 P
QYOJSKGCWNAKGW-PBXRRBTRSA-N
 Ligand Interaction
FMT
Query on FMT

Download SDF File 
Download CCD File 
A
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
S3PKd: 7000 - 8000 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.164 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 57.660α = 90.00
b = 85.110β = 90.00
c = 87.510γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata scaling
CNSphasing
CrystalCleardata collection
CNSrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-12-15 
  • Released Date: 2009-02-17 
  • Deposition Author(s): Schonbrunn, E.

Revision History 

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-02-29
    Type: Structure summary