Human Glucose-6-phosphate Isomerase

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.197 

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This is version 1.4 of the entry. See complete history


Crystal structure of human phosphoglucose isomerase and analysis of the initial catalytic steps

Cordeiro, A.T.Godoi, P.H.C.Silva, C.H.T.P.Garratt, R.C.Oliva, G.Thiemann, O.H.

(2003) Biochim Biophys Acta 1645: 117-122

  • DOI: https://doi.org/10.1016/s1570-9639(02)00464-8
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The second enzyme in the glycolytic pathway, phosphoglucose isomerase (PGI), catalyses an intracellular aldose-ketose isomerization. Here we describe the human recombinant PGI structure (hPGI) solved in the absence of active site ligands. Crystals isomorphous to those previously reported were used to collect a 94% complete data set to a limiting resolution of 2.1 A. From the comparison between the free active site hPGI structure and the available human and rabbit PGI (rPGI) structures, a mechanism for protein initial catalytic steps is proposed. Binding of the phosphate moiety of the substrate to two distinct elements of the active site is responsible for driving a series of structural changes resulting in the polarisation of the active site histidine, priming it for the initial ring-opening step of catalysis.

  • Organizational Affiliation

    Laboratory of Protein Crystallography and Structural Biology, Physics Institute of São Carlos, University of São Paulo-USP, Av Trabalhador Sãocarlense 400, PO Box 369, 13566-590 São Carlos-SP, Brazil.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
phosphoglucose isomerase
A, B, C, D
558Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P06744 (Homo sapiens)
Explore P06744 
Go to UniProtKB:  P06744
PHAROS:  P06744
GTEx:  ENSG00000105220 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06744
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.75α = 90
b = 108.021β = 90
c = 271.073γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2023-08-16
    Changes: Data collection, Database references, Refinement description