Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 52.10 kDa 
• Atom Count: 3726 
• Residue Count: 440 
• Unique protein chains: 1

2R6K

Crystal structure of an I71V hGSTA1-1 mutant in complex with S-hexylglutathione

• DOI: 10.2210/pdb2R6K/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2007-09-06 Released: 2008-08-19 
• Deposition Author(s): Dirr, H.W., Fisher, L., Burke, J.P.W.G., Sayed, M., Sewell, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.51 Å
• R-Value Free: 0.298 
• R-Value Work: 0.206 
• R-Value Observed: 0.211 

Literature

The role of a topologically conserved isoleucine in glutathione transferase structure, stability and function.

Achilonu, I., Gildenhuys, S., Fisher, L., Burke, J., Fanucchi, S., Sewell, B.T., Fernandes, M., Dirr, H.W.

(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun 66: 776-780

• PubMed: 20606271 
• DOI: 10.1107/S1744309110019135
• Primary Citation of Related Structures:  
  2R6K, 3KTL


• PubMed Abstract: 
  

The common fold shared by members of the glutathione-transferase (GST) family has a topologically conserved isoleucine residue at the N-terminus of helix 3 which is involved in the packing of helix 3 against two beta-strands in domain 1. The role of the isoleucine residue in the structure, function and stability of GST was investigated by replacing the Ile71 residue in human GSTA1-1 by alanine or valine. The X-ray structures of the I71A and I71V mutants resolved at 1.75 and 2.51 A, respectively, revealed that the mutations do not alter the overall structure of the protein compared with the wild type. Urea-induced equilibrium unfolding studies using circular dichroism and tryptophan fluorescence suggest that the mutation of Ile71 to alanine or valine reduces the stability of the protein. A functional assay with 1-chloro-2,4-dinitrobenzene shows that the mutation does not significantly alter the function of the protein relative to the wild type. Overall, the results suggest that conservation of the topologically conserved Ile71 maintains the structural stability of the protein but does not play a significant role in catalysis and substrate binding.

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Organizational Affiliation: 

Protein Structure-Function Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glutathione S-transferase A1	A, B	222	Homo sapiens	Mutation(s): 1  Gene Names: GSTA1 EC: 2.5.1.18 (PDB Primary Data), 1.11.1 (UniProt), 5.3.3 (UniProt)
Find proteins for P08263 (Homo sapiens) Explore P08263  Go to UniProtKB:  P08263
NIH Common Fund Data Resources
PHAROS:  P08263 GTEx:  ENSG00000243955

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GTX	A, B	S-HEXYLGLUTATHIONE C16 H30 N3 O6 S HXJDWCWJDCOHDG-RYUDHWBXSA-O

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.51 Å
• R-Value Free: 0.298 
• R-Value Work: 0.206 
• R-Value Observed: 0.211 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 98.409	α = 90
b = 93.577	β = 93.05
c = 50.717	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-09-06 
• Released Date: 2008-08-19 
Deposition Author(s): Dirr, H.W., Fisher, L., Burke, J.P.W.G., Sayed, M., Sewell, T.

Revision History 

• Version 1.0: 2008-08-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-10-25
  Changes: Refinement description