2GC3

The crystal structure of phosphoglucose isomerase from Pyrococcus furiosus in complex with mannose 6-phosphate and zinc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.162 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Evidence Supporting a cis-enediol-based Mechanism for Pyrococcus furiosus Phosphoglucose Isomerase

Berrisford, J.M.Hounslow, A.M.Akerboom, J.Hagen, W.R.Brouns, S.J.van der Oost, J.Murray, I.A.Michael Blackburn, G.Waltho, J.P.Rice, D.W.Baker, P.J.

(2006) J Mol Biol 358: 1353-1366

  • DOI: https://doi.org/10.1016/j.jmb.2006.03.015
  • Primary Citation of Related Structures:  
    2GC0, 2GC1, 2GC2, 2GC3

  • PubMed Abstract: 

    The enzymatic aldose ketose isomerisation of glucose and fructose sugars involves the transfer of a hydrogen between their C1 and C2 carbon atoms and, in principle, can proceed through either a direct hydride shift or via a cis-enediol intermediate. Pyrococcus furiosus phosphoglucose isomerase (PfPGI), an archaeal metalloenzyme, which catalyses the interconversion of glucose 6-phosphate and fructose 6-phosphate, has been suggested to operate via a hydride shift mechanism. In contrast, the structurally distinct PGIs of eukaryotic or bacterial origin are thought to catalyse isomerisation via a cis-enediol intermediate. We have shown by NMR that hydrogen exchange between substrate and solvent occurs during the reaction catalysed by PfPGI eliminating the possibility of a hydride-shift-based mechanism. In addition, kinetic measurements on this enzyme have shown that 5-phospho-d-arabinonohydroxamate, a stable analogue of the putative cis-enediol intermediate, is the most potent inhibitor of the enzyme yet discovered. Furthermore, determination and analysis of crystal structures of PfPGI with bound zinc and the substrate F6P, and with a number of competitive inhibitors, and EPR analysis of the coordination of the metal ion within PfPGI, have suggested that a cis-enediol intermediate-based mechanism is used by PfPGI with Glu97 acting as the catalytic base responsible for isomerisation.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucose-6-phosphate isomerase
A, B
188Pyrococcus furiosusMutation(s): 0 
Gene Names: pgiA
EC: 5.3.1.9
UniProt
Find proteins for P83194 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Explore P83194 
Go to UniProtKB:  P83194
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83194
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.346α = 90
b = 74.016β = 90
c = 74.835γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-11
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary