Crystal structure of mouse phosphoglucose isomerase

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

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This is version 1.3 of the entry. See complete history


The crystal structure of mouse phosphoglucose isomerase at 1.6A resolution and its complex with glucose 6-phosphate reveals the catalytic mechanism of sugar ring opening.

Graham Solomons, J.T.Zimmerly, E.M.Burns, S.Krishnamurthy, N.Swan, M.K.Krings, S.Muirhead, H.Chirgwin, J.Davies, C.

(2004) J Mol Biol 342: 847-860

  • DOI: https://doi.org/10.1016/j.jmb.2004.07.085
  • Primary Citation of Related Structures:  
    1U0E, 1U0F, 1U0G

  • PubMed Abstract: 

    Phosphoglucose isomerase (PGI) is an enzyme of glycolysis that interconverts glucose 6-phosphate (G6P) and fructose 6-phosphate (F6P) but, outside the cell, is a multifunctional cytokine. High-resolution crystal structures of the enzyme from mouse have been determined in native form and in complex with the inhibitor erythrose 4-phosphate, and with the substrate glucose 6-phosphate. In the substrate-bound structure, the glucose sugar is observed in both straight-chain and ring forms. This structure supports a specific role for Lys518 in enzyme-catalyzed ring opening and we present a "push-pull" mechanism in which His388 breaks the O5-C1 bond by donating a proton to the ring oxygen atom and, simultaneously, Lys518 abstracts a proton from the C1 hydroxyl group. The reverse occurs in ring closure. The transition from ring form to straight-chain substrate is achieved through rotation of the C3-C4 bond, which brings the C1-C2 region into close proximity to Glu357, the base catalyst for the isomerization step. The structure with G6P also explains the specificity of PGI for glucose 6-phosphate over mannose 6-isomerase (M6P). To isomerize M6P to F6P requires a rotation of its C2-C3 bond but in PGI this is sterically blocked by Gln511.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucose-6-phosphate isomerase
A, B
564Mus musculusMutation(s): 0 
Gene Names: Gpi
Find proteins for P06745 (Mus musculus)
Explore P06745 
Go to UniProtKB:  P06745
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06745
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
Q [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B]
O4 S
Query on GOL

Download Ideal Coordinates CCD File 
L [auth A]
M [auth A]
N [auth A]
O [auth A]
P [auth A]
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
W [auth B],
X [auth B]
C3 H8 O3
Query on BME

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A]
C2 H6 O S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.2α = 90
b = 116.1β = 101.3
c = 73.1γ = 90
Software Package:
Software NamePurpose
CrystalCleardata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description