1MD3

A folding mutant of human class pi glutathione transferase, created by mutating glycine 146 of the wild-type protein to alanine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Contribution of Glycine 146 to a Conserved Folding Module Affecting Stability and Refolding of Human Glutathione Transferase P1-1

Kong, G.K.-W.Polekhina, G.McKinstry, W.J.Parker, M.W.Dragani, B.Aceto, A.Paludi, D.Principe, D.R.Mannervik, B.Stenberg, G.

(2003) J.Biol.Chem. 278: 1291-1302

  • DOI: 10.1074/jbc.M209581200
  • Primary Citation of Related Structures:  1MD4

  • PubMed Abstract: 
  • In human glutathione transferase P1-1 (hGSTP1-1) position 146 is occupied by a glycine residue, which is located in a bend of a long loop that together with the alpha6-helix forms a substructure (GST motif II) maintained in all soluble GSTs. In the p ...

    In human glutathione transferase P1-1 (hGSTP1-1) position 146 is occupied by a glycine residue, which is located in a bend of a long loop that together with the alpha6-helix forms a substructure (GST motif II) maintained in all soluble GSTs. In the present study G146A and G146V mutants were generated by site-directed mutagenesis in order to investigate the function played by this conserved residue in folding and stability of hGSTP1-1. Crystallographic analysis of the G146V variant, expressed at the permissive temperature of 25 degrees C, indicates that the mutation causes a substantial change of the backbone conformation because of steric hindrance. Stability measurements indicate that this mutant is inactivated at a temperature as low as 32 degrees C. The structure of the G146A mutant is identical to that of the wild type with the mutated residue having main-chain bond angles in a high energy region of the Ramachandran plot. However even this Gly --> Ala substitution inactivates the enzyme at 37 degrees C. Thermodynamic analysis of all variants confirms, together with previous findings, the critical role played by GST motif II for overall protein stability. Analysis of reactivation in vitro indicates that any mutation of Gly-146 alters the folding pathway by favoring aggregation at 37 degrees C. It is hypothesized that the GST motif II is involved in the nucleation mechanism of the protein and that the substitution of Gly-146 alters this transient substructure. Gly-146 is part of the buried local sequence GXXh(T/S)XXDh (X is any residue and h is a hydrophobic residue), conserved in all GSTs and related proteins that seems to behave as a characteristic structural module important for protein folding and stability.


    Organizational Affiliation

    Biota Structural Biology Laboratory, St. Vincent's Institute of Medical Research, Fitzroy, Victoria 3065, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
pi glutathione transferase
A, B
209Homo sapiensGene Names: GSTP1 (FAEES3, GST3)
EC: 2.5.1.18
Find proteins for P09211 (Homo sapiens)
Go to Gene View: GSTP1
Go to UniProtKB:  P09211
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSH
Query on GSH

Download SDF File 
Download CCD File 
A, B
GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A, B
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 78.430α = 90.00
b = 89.720β = 98.39
c = 69.000γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-21
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance