4HJ2

Crystal Structure Analysis of GSTA1-1 in complex with chlorambucil


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 

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Literature

The interaction of the chemotherapeutic drug chlorambucil with human glutathione transferase A1-1: kinetic and structural analysis.

Karpusas, M.Axarli, I.Chiniadis, L.Papakyriakou, A.Bethanis, K.Scopelitou, K.Clonis, Y.D.Labrou, N.E.

(2013) PLoS One 8: e56337-e56337

  • DOI: 10.1371/journal.pone.0056337
  • Primary Citation of Related Structures:  
    4HJ2

  • PubMed Abstract: 
  • Glutathione transferases (GSTs) are enzymes that contribute to cellular detoxification by catalysing the nucleophilic attack of glutathione (GSH) on the electrophilic centre of a number of xenobiotic compounds, including several chemotherapeutic drugs. In the present work we investigated the interaction of the chemotherapeutic drug chlorambucil (CBL) with human GSTA1-1 (hGSTA1-1) using kinetic analysis, protein crystallography and molecular dynamics ...

    Glutathione transferases (GSTs) are enzymes that contribute to cellular detoxification by catalysing the nucleophilic attack of glutathione (GSH) on the electrophilic centre of a number of xenobiotic compounds, including several chemotherapeutic drugs. In the present work we investigated the interaction of the chemotherapeutic drug chlorambucil (CBL) with human GSTA1-1 (hGSTA1-1) using kinetic analysis, protein crystallography and molecular dynamics. In the presence of GSH, CBL behaves as an efficient substrate for hGSTA1-1. The rate-limiting step of the catalytic reaction between CBL and GSH is viscosity-dependent and kinetic data suggest that product release is rate-limiting. The crystal structure of the hGSTA1-1/CBL-GSH complex was solved at 2.1 Å resolution by molecular replacement. CBL is bound at the H-site attached to the thiol group of GSH, is partially ordered and exposed to the solvent, making specific interactions with the enzyme. Molecular dynamics simulations based on the crystal structure indicated high mobility of the CBL moiety and stabilization of the C-terminal helix due to the presence of the adduct. In the absence of GSH, CBL is shown to be an alkylating irreversible inhibitor for hGSTA1-1. Inactivation of the enzyme by CBL followed a biphasic pseudo-first-order saturation kinetics with approximately 1 mol of CBL per mol of dimeric enzyme being incorporated. Structural analysis suggested that the modifying residue is Cys112 which is located at the entrance of the H-site. The results are indicative of a structural communication between the subunits on the basis of mutually exclusive modification of Cys112, indicating that the two enzyme active sites are presumably coordinated.


    Organizational Affiliation

    Physics Laboratory, Department of Science, Agricultural University of Athens, Athens, Greece.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutathione S-transferase A1A, B217Homo sapiensMutation(s): 0 
Gene Names: GSTA1
EC: 2.5.1.18 (PDB Primary Data), 1.11.1 (UniProt), 5.3.3 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P08263 (Homo sapiens)
Explore P08263 
Go to UniProtKB:  P08263
PHAROS:  P08263
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LZ6
Query on LZ6

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]L-gamma-glutamyl-S-(2-{[4-(3-carboxypropyl)phenyl](2-chloroethyl)amino}ethyl)-L-cysteinylglycine
C24 H35 Cl N4 O8 S
BQVGPQFUMPRIMA-OALUTQOASA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
LZ6Kd :  2950000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99α = 90
b = 93.53β = 93.91
c = 51.18γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release