Ure2p in Complex with Glutathione

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.207 

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Crystal structures of the yeast prion Ure2p functional region in complex with glutathione and related compounds.

Bousset, L.Belrhali, H.Melki, R.Morera, S.

(2001) Biochemistry 40: 13564-13573

  • DOI: https://doi.org/10.1021/bi011007b
  • Primary Citation of Related Structures:  
    1JZR, 1K0A, 1K0B, 1K0C, 1K0D

  • PubMed Abstract: 

    The [URE3] phenotype in yeast Saccharomyces cerevisiae is due to an altered prion form of Ure2p, a protein involved in nitrogen catabolism. To understand possible conformational changes at the origin of prion propagation, we previously solved the crystal structure of the Ure2p functional region [Bousset et al. (2001) Structure 9, 39-46]. We showed the protein to have a fold similar to that of the beta class of glutathione S-transferases (GSTs). Here we report crystal structures of the Ure2p functional region (extending from residues 95-354) in complex with glutathione (GSH), the substrate of all GSTs, and two widely used GST inhibitors, namely, S-hexylglutathione and S-p-nitrobenzylglutathione. In a manner similar to what is observed in many GSTs, ligand binding is not accompanied by a significant change in the conformation of the protein. We identify one GSH and one hydrophobic electrophile binding site per monomer as observed in all other GSTs. The sulfur group of GSH, that conjugates electrophiles, is located near the amide group of Asn124, allowing a hydrogen bond to be formed. Biochemical data indicate that GSH binds to Ure2p with high affinity. Its binding affects Ure2p oligomerization but has no effect on the assembly of the protein into amyloid fibrils. Despite results indicating that Ure2p lacks GST activity, we propose that Ure2p is a member of the GST superfamily that may describe a novel GST class. Our data bring new insights into the function of the Ure2p active region.

  • Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
260Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for P23202 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P23202 
Go to UniProtKB:  P23202
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23202
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.504α = 90
b = 124.912β = 90
c = 160.846γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-21
    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: 2011-12-21
    Changes: Non-polymer description
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations