1GSU

AN AVIAN CLASS-MU GLUTATHIONE S-TRANSFERASE, CGSTM1-1 AT 1.94 ANGSTROM RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 
    0.290 (Depositor), 0.240 (DCC) 
  • R-Value Work: 
    0.210 (Depositor), 0.220 (DCC) 
  • R-Value Observed: 
    0.210 (Depositor) 

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Ligand Structure Quality Assessment 

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Literature

The three-dimensional structure of an avian class-mu glutathione S-transferase, cGSTM1-1 at 1.94 A resolution.

Sun, Y.J.Kuan, I.C.Tam, M.F.Hsiao, C.D.

(1998) J Mol Biol 278: 239-252

  • DOI: https://doi.org/10.1006/jmbi.1998.1716
  • Primary Citation of Related Structures:  
    1GSU

  • PubMed Abstract: 

    Glutathione S-transferase cGSTM1-1, an avian class-mu enzyme with high sequence identity with rGSTM3-3, was expressed heterologously in Escherichia coli. The three-dimensional structure of this protein that co-crystallized with an inhibitor, S-hexylglutathione, was determined by the molecular replacement method and refined to 1.94 A resolution. The three-dimensional structure and the folding topology of the dimeric cGSTM1-1 closely resembles those of other class-mu GSTs. The bound inhibitor, S-hexylglutathione, orients in disparate directions in the two subunits. The combined space occupied by the hexyl moiety of the inhibitors overlaps with that reported for rGSTM1-1 co-crystallized with (9 S,10 S)-9-(S-glutathionyl)-10-hydroxy-9,10-dihydrophenanthrene. Conformational differences at a flexible loop (residue 35 to 40) were also observed between the crystal structures of cGSTM1-1 and rGSTM1-1.cGSTM1-1 has the highest epoxidase activity among all the class-mu enzymes reported. Tyr115, has been identified as a residue that participates in the epoxidase activity of class-mu glutathione S-transferase and is conserved in cGSTM1-1. The epoxidase and trans-4-phenyl-3-buten-2-one conjugating activity of cGSTM1-1 are decreased drastically but not abolished by replacing Tyr115 with phenylalanine. The specificity constant of the cGSTM1-1(Y115F) mutant, with 1-chloro-2,4-dinitrobenzene as substrate, is 15-fold higher than that of the wild-type enzyme.


  • Organizational Affiliation

    Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan, 11529, Republic of China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CLASS-MU GLUTATHIONE S-TRANSFERASE
A, B
219Gallus gallusMutation(s): 0 
Gene Names: CGSTM1
EC: 2.5.1.18
UniProt
Find proteins for P20136 (Gallus gallus)
Explore P20136 
Go to UniProtKB:  P20136
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20136
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free:  0.290 (Depositor), 0.240 (DCC) 
  • R-Value Work:  0.210 (Depositor), 0.220 (DCC) 
  • R-Value Observed: 0.210 (Depositor) 
Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.3α = 90
b = 88β = 90
c = 93.5γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted GTXClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-03-04
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations, Other