Human glutathione-S-transferase M2-2 T210S mutant in complex with glutathione-styrene oxide conjugate

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

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This is version 1.4 of the entry. See complete history


Alternative Mutations of a Positively Selected Residue Elicit Gain or Loss of Functionalities in Enzyme Evolution.

Norrgard, M.A.Ivarsson, Y.Tars, K.Mannervik, B.

(2006) Proc Natl Acad Sci U S A 103: 4876

  • DOI: https://doi.org/10.1073/pnas.0600849103
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    All molecular species in an organism are connected physically and functionally to other molecules. In evolving systems, it is not obvious to what extent functional properties of a protein can change to selective advantage and leave intact favorable traits previously acquired. This uncertainty has particular significance in the evolution of novel pathways for detoxication, because an organism challenged with new xenobiotics in the environment may still require biotransformation of previously encountered toxins. Positive selection has been proposed as an evolutionary mechanism for facile adaptive responses of proteins to changing conditions. Here, we show, by saturation mutagenesis, that mutations of a hypervariable residue in human glutathione transferase M2-2 can differentially change the enzyme's substrate-activity profile with alternative substrates and, furthermore, enable or disable dissimilar chemical reactions. Crystal structures demonstrate that activity with epoxides is enabled through removal of steric hindrance from a methyl group, whereas activities with an orthoquinone and a nitroso donor are maintained in the variant enzymes. Given the diversity of cellular activities in which a single protein can be engaged, the selective transmutation of functional properties has general significance in molecular evolution.

  • Organizational Affiliation

    Department of Biochemistry and Organic Chemistry, Uppsala University, Biomedical Center, Box 576, SE-75123 Uppsala, Sweden.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
218Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P28161 (Homo sapiens)
Explore P28161 
Go to UniProtKB:  P28161
PHAROS:  P28161
GTEx:  ENSG00000213366 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28161
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.176α = 90
b = 67.768β = 99.06
c = 115.705γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata 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: 2005-10-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description