4ACS

Crystal structure of mutant GST A2-2 with enhanced catalytic efficiency with azathioprine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.264 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure-based redesign of GST A2-2 for enhanced catalytic efficiency with azathioprine.

Zhang, W.Moden, O.Tars, K.Mannervik, B.

(2012) Chem Biol 19: 414-421

  • DOI: 10.1016/j.chembiol.2012.01.021
  • Primary Citation of Related Structures:  
    4ACS

  • PubMed Abstract: 
  • Glutathione transferase (GST) A2-2 is the most efficient human enzyme in the biotransformation of the prodrug azathioprine (Aza). The activation of Aza has therapeutic potential for possible use of GSTs in targeted enzyme-prodrug treatment of diseases. Based on the assumed catalytic mechanism and computational docking of Aza to the active site of the enzyme, active-site residues were selected for construction of focused mutant libraries, which were thereafter screened for Aza activity ...

    Glutathione transferase (GST) A2-2 is the most efficient human enzyme in the biotransformation of the prodrug azathioprine (Aza). The activation of Aza has therapeutic potential for possible use of GSTs in targeted enzyme-prodrug treatment of diseases. Based on the assumed catalytic mechanism and computational docking of Aza to the active site of the enzyme, active-site residues were selected for construction of focused mutant libraries, which were thereafter screened for Aza activity. Mutants with elevated Aza activity were identified, DNA sequenced, and the proteins purified. The two most active mutants showed up to 70-fold higher catalytic efficiency than the parental GST A2-2. The structure of the most active triple mutant (L107G/L108D/F222H) enzyme was determined by X-ray crystallography demonstrating significant changes in the topography of the active site facilitating productive binding of Aza as a substrate.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GLUTATHIONE S-TRANSFERASE A2A, B, C, D222Homo sapiensMutation(s): 3 
Gene Names: GSTA2GST2
EC: 2.5.1.18
UniProt & NIH Common Fund Data Resources
Find proteins for P09210 (Homo sapiens)
Explore P09210 
Go to UniProtKB:  P09210
PHAROS:  P09210
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSH
Query on GSH

Download Ideal Coordinates CCD File 
E [auth A], F [auth B], G [auth C], H [auth D]GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.264 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.66α = 90
b = 94.8β = 92.77
c = 113.72γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-28
    Type: Initial release
  • Version 1.1: 2012-04-04
    Changes: Other
  • Version 1.2: 2018-05-02
    Changes: Data collection
  • Version 1.3: 2019-09-25
    Changes: Data collection, Database references, Experimental preparation, Other