4MU3

The form A structure of an E21Q catalytic mutant of A. thaliana IGPD2 in complex with Mn2+ and a mixture of its substrate, 2R3S-IGP, and an inhibitor, 2S3S-IGP, to 1.12 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.139 
  • R-Value Work: 0.125 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures Reveal that the Reaction Mechanism of Imidazoleglycerol-Phosphate Dehydratase Is Controlled by Switching Mn(II) Coordination.

Bisson, C.Britton, K.L.Sedelnikova, S.E.Rodgers, H.F.Eadsforth, T.C.Viner, R.C.Hawkes, T.R.Baker, P.J.Rice, D.W.

(2015) Structure 23: 1236-1245

  • DOI: 10.1016/j.str.2015.05.012
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Imidazoleglycerol-phosphate dehydratase (IGPD) catalyzes the Mn(II)-dependent dehydration of imidazoleglycerol phosphate (IGP) to 3-(1H-imidazol-4-yl)-2-oxopropyl dihydrogen phosphate during biosynthesis of histidine. As part of a program of herbicid ...

    Imidazoleglycerol-phosphate dehydratase (IGPD) catalyzes the Mn(II)-dependent dehydration of imidazoleglycerol phosphate (IGP) to 3-(1H-imidazol-4-yl)-2-oxopropyl dihydrogen phosphate during biosynthesis of histidine. As part of a program of herbicide design, we have determined a series of high-resolution crystal structures of an inactive mutant of IGPD2 from Arabidopsis thaliana in complex with IGP. The structures represent snapshots of the enzyme trapped at different stages of the catalytic cycle and show how substrate binding triggers a switch in the coordination state of an active site Mn(II) between six- and five-coordinate species. This switch is critical to prime the active site for catalysis, by facilitating the formation of a high-energy imidazolate intermediate. This work not only provides evidence for the molecular processes that dominate catalysis in IGPD, but also describes how the manipulation of metal coordination can be linked to discrete steps in catalysis, demonstrating one way that metalloenzymes exploit the unique properties of metal ions to diversify their chemistry.


    Organizational Affiliation

    Department of Molecular Biology and Biotechnology, Krebs Institute for Biomolecular Research, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Imidazoleglycerol-phosphate dehydratase 2, chloroplastic
A
205Arabidopsis thalianaMutation(s): 1 
Gene Names: HISN5B
EC: 4.2.1.19
Find proteins for O23346 (Arabidopsis thaliana)
Go to UniProtKB:  O23346
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
IG2
Query on IG2

Download SDF File 
Download CCD File 
A
(2S,3S)-2,3-dihydroxy-3-(1H-imidazol-5-yl)propyl dihydrogen phosphate
C6 H11 N2 O6 P
HFYBTHCYPKEDQQ-WDSKDSINSA-N
 Ligand Interaction
IYP
Query on IYP

Download SDF File 
Download CCD File 
A
(2R,3S)-2,3-dihydroxy-3-(1H-imidazol-5-yl)propyl dihydrogen phosphate
C6 H11 N2 O6 P
HFYBTHCYPKEDQQ-RITPCOANSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.139 
  • R-Value Work: 0.125 
  • Space Group: P 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 113.100α = 90.00
b = 113.100β = 90.00
c = 113.100γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
GDAdata collection
SCALAdata scaling
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2015-07-22
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description