3LFL

Crystal Structure of human Glutathione Transferase Omega 1, delta 155

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history. 


Literature

Novel folding and stability defects cause a deficiency of human glutathione transferase omega 1.

Zhou, H., Brock, J., Casarotto, M.G., Oakley, A.J., Board, P.G.

(2011) J Biol Chem 286: 4271-4279

  • DOI: 10.1074/jbc.M110.197822
  • Primary Citation of Related Structures:  
    3LFL

  • PubMed Abstract: 

    • The polymorphic deletion of Glu-155 from human glutathione transferase omega1 (GSTO1-1) occurs in most populations. Although the recombinant ΔGlu-155 enzyme expressed in Escherichia coli is active, the deletion causes a deficiency of the active enzyme in vivo ...

    The polymorphic deletion of Glu-155 from human glutathione transferase omega1 (GSTO1-1) occurs in most populations. Although the recombinant ΔGlu-155 enzyme expressed in Escherichia coli is active, the deletion causes a deficiency of the active enzyme in vivo. The crystal structure and the folding/unfolding kinetics of the ΔGlu-155 variant were determined in order to investigate the cause of the rapid loss of the enzyme in human cells. The crystal structure revealed altered packing around the Glu-155 deletion, an increase in the predicted solvent-accessible area and a corresponding reduction in the buried surface area. This increase in solvent accessibility was consistent with an elevated Stern-Volmer constant. The unfolding of both the wild type and ΔGlu-155 enzyme in urea is best described by a three-state model, and there is evidence for the more pronounced population of an intermediate state by the ΔGlu-155 enzymes. Studies using intrinsic fluorescence revealed a free energy change around 14.4 kcal/mol for the wild type compared with around 8.6 kcal/mol for the ΔGlu-155 variant, which indicates a decrease in stability associated with the Glu-155 deletion. Urea induced unfolding of the wild type GSTO1-1 was reversible through an initial fast phase followed by a second slow phase. In contrast, the ΔGlu-155 variant lacks the slow phase, indicating a refolding defect. It is possible that in some conditions in vivo, the increased solvent-accessible area and the low stability of the ΔGlu-155 variant may promote its unfolding, whereas the refolding defect limits its refolding, resulting in GSTO1-1 deficiency.

    Organizational Affiliation: 

    John Curtin School of Medical Research, Australian National University, Canberra, Australian Capital Territory 2601, Australia.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutathione S-transferase omega-1 A, B, C240Homo sapiensMutation(s): 0 
Gene Names: GSTO1, GSTTLP28
EC: 2.5.1.18 (PDB Primary Data), 1.8.5.1 (UniProt), 1.20.4.2 (UniProt)
Find proteins for P78417 (Homo sapiens)
Explore P78417 
Go to UniProtKB:  P78417
NIH Common Fund Data Resources
PHAROS:  P78417
GTEx:  ENSG00000148834
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.009α = 90
b = 201.942β = 90
c = 53.387γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2010-01-18 
  • Released Date: 2010-11-24 
    • Deposition Author(s): Brock, J.

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-12-14
    Changes: Non-polymer description
  • Version 1.3: 2012-05-09
    Changes: Data collection
  • Version 1.4: 2017-11-01
    Changes: Advisory, Refinement description, Structure summary