Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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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: 47781.19 
• Atom Count: 3341 
• Residue Count: 418 
• Unique protein chains: 1

2GSS

HUMAN GLUTATHIONE S-TRANSFERASE P1-1 IN COMPLEX WITH ETHACRYNIC ACID

• DOI: 10.2210/pdb2GSS/pdb

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


• Deposited: 1996-10-29 Released: 1997-11-12 
• Deposition Author(s): Oakley, A.J., Rossjohn, J., Parker, M.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.229 
• R-Value Work: 0.209 

Literature

The three-dimensional structure of the human Pi class glutathione transferase P1-1 in complex with the inhibitor ethacrynic acid and its glutathione conjugate.

Oakley, A.J., Rossjohn, J., Lo Bello, M., Caccuri, A.M., Federici, G., Parker, M.W.

(1997) Biochemistry 36: 576-585

• PubMed: 9012673 
• DOI: 10.1021/bi962316i
• Primary Citation of Related Structures:  
  3GSS


• PubMed Abstract: 
  

The potent diuretic drug ethacrynic acid has been tested in clinical trials as an adjuvant in chemotherapy. Its target is the detoxifying enzyme glutathione transferase which is often found overexpressed in cancer tissues. We have solved the crystal structures of human pi class glutathione transferase P1-1 in complex with the inhibitor ethacrynic acid and its glutathione conjugate. Ethacrynic acid is found to bind in a nonproductive mode to one of the ligand binding sites of the enzyme (the H site) while the glutathione binding site (G site) is occupied by solvent molecules. There are no structural rearrangements of the G site in the absence of ligand. The structure indicates that bound glutathione is required for ethacrynic acid to dock into the H site in a productive binding mode. The binding of the ethacrynic acid-glutathione conjugate shows that the contacts of the glutathione moiety with the protein are identical to those observed in crystal structures of the enzyme with other glutathione-based substrates and inhibitors. The ethacrynic acid moiety of the conjugate binds in the H site in a fashion that has not been observed in crystal structures of other glutathione-based inhibitor complexes. The crystal structures implicate Tyr 108 as an electrophilic participant in the Michael addition of glutathione to ethacrynic acid.

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Related Citations: 

• Three-Dimensional Structure of Class Pi Glutathione S-Transferase from Human Placenta in Complex with S-Hexylglutathione at 2.8 A Resolution
  Reinemer, P.,Dirr, H.W.,Ladenstein, R.,Huber, R.,Lo Bello, M.,Federici, G.,Parker, M.W.
  (1992) J.Mol.Biol. 227: 214




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Organizational Affiliation: 

Ian Porter Foundation Protein Crystallography Laboratory, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GLUTATHIONE S-TRANSFERASE P1-1	A, B	209	Homo sapiens	Mutation(s): 0  Gene 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 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
EAA	A, B	ETHACRYNIC ACID C13 H12 Cl2 O4 AVOLMBLBETYQHX-UHFFFAOYSA-N
MES	A, B	2-(N-MORPHOLINO)-ETHANESULFONIC ACID C6 H13 N O4 S SXGZJKUKBWWHRA-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
EAA	Ki: 11500 nM BINDINGMOAD
EAA	Ki: 11500 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.229 
• R-Value Work: 0.209 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 77.547	α = 90.00
b = 90.004	β = 97.69
c = 68.883	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
AMoRE	phasing
DENZO	data reduction
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-10-29 
• Released Date: 1997-11-12 
• Deposition Author(s): Oakley, A.J., Rossjohn, J., Parker, M.W.

Revision History 

• Version 1.0: 1997-11-12
  Type: Initial release
• Version 1.1: 2008-03-03
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance