Crystal structure of the 26 kDa glutathione S-transferase from Schistosoma japonicum complexed with gamma-glutamyl[S-(2-iodobenzyl)cysteinyl]glycine

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.231 

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Characterization of the electrophile binding site and substrate binding mode of the 26-kDa glutathione S-transferase from Schistosoma japonicum

Cardoso, R.M.F.Daniels, D.S.Bruns, C.M.Tainer, J.A.

(2003) Proteins 51: 137-146

  • DOI: https://doi.org/10.1002/prot.10345
  • Primary Citation of Related Structures:  
    1M99, 1M9A, 1M9B

  • PubMed Abstract: 

    The 26-kDa glutathione S-transferase from Schistosoma japonicum (Sj26GST), a helminth worm that causes schistosomiasis, catalyzes the conjugation of glutathione with toxic secondary products of membrane lipid peroxidation. Crystal structures of Sj26GST in complex with glutathione sulfonate (Sj26GSTSLF), S-hexyl glutathione (Sj26GSTHEX), and S-2-iodobenzyl glutathione (Sj26GSTIBZ) allow characterization of the electrophile binding site (H site) of Sj26GST. The S-hexyl and S-2-iodobenzyl moieties of these product analogs bind in a pocket defined by side-chains from the beta1-alpha1 loop (Tyr7, Trp8, Ile10, Gly12, Leu13), helix alpha4 (Arg103, Tyr104, Ser107, Tyr111), and the C-terminal coil (Gln204, Gly205, Trp206, Gln207). Changes in the Ser107 and Gln204 dihedral angles make the H site more hydrophobic in the Sj26GSTHEX complex relative to the ligand-free structure. These structures, together with docking studies, indicate a possible binding mode of Sj26GST to its physiologic substrates 4-hydroxynon-2-enal (4HNE), trans-non-2-enal (NE), and ethacrynic acid (EA). In this binding mode, hydrogen bonds of Tyr111 and Gln207 to the carbonyl oxygen atoms of 4HNE, NE, and EA could orient the substrates and enhance their electrophilicity to promote conjugation with glutathione.

  • Organizational Affiliation

    Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutathione S-Transferase 26 kDa218Schistosoma japonicumMutation(s): 0 
Find proteins for P08515 (Schistosoma japonicum)
Explore P08515 
Go to UniProtKB:  P08515
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08515
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IBG

Download Ideal Coordinates CCD File 
C17 H22 I N3 O6 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.231 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.567α = 90
b = 116.567β = 90
c = 78.748γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Refinement description