4IS0

Structural Insights into Omega-Class Glutathione Transferases: A Snapshot of Enzyme Reduction and Identification of the Non-Catalytic Ligandin Site.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.721 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural insights into omega-class glutathione transferases: a snapshot of enzyme reduction and identification of a non-catalytic ligandin site.

Brock, J.Board, P.G.Oakley, A.J.

(2013) Plos One 8: e60324-e60324

  • DOI: 10.1371/journal.pone.0060324

  • PubMed Abstract: 
  • Glutathione transferases (GSTs) are dimeric enzymes containing one active-site per monomer. The omega-class GSTs (hGSTO1-1 and hGSTO2-2 in humans) are homodimeric and carry out a range of reactions including the glutathione-dependant reduction of a r ...

    Glutathione transferases (GSTs) are dimeric enzymes containing one active-site per monomer. The omega-class GSTs (hGSTO1-1 and hGSTO2-2 in humans) are homodimeric and carry out a range of reactions including the glutathione-dependant reduction of a range of compounds and the reduction of S-(phenacyl)glutathiones to acetophenones. Both types of reaction result in the formation of a mixed-disulfide of the enzyme with glutathione through the catalytic cysteine (C32). Recycling of the enzyme utilizes a second glutathione molecule and results in oxidized glutathione (GSSG) release. The crystal structure of an active-site mutant (C32A) of the hGSTO1-1 isozyme in complex with GSSG provides a snapshot of the enzyme in the process of regeneration. GSSG occupies both the G (GSH-binding) and H (hydrophobic-binding) sites and causes re-arrangement of some H-site residues. In the same structure we demonstrate the existence of a novel "ligandin" binding site deep within in the dimer interface of this enzyme, containing S-(4-nitrophenacyl)glutathione, an isozyme-specific substrate for hGSTO1-1. The ligandin site, conserved in Omega class GSTs from a range of species, is hydrophobic in nature and may represent the binding location for tocopherol esters that are uncompetitive hGSTO1-1 inhibitors.


    Organizational Affiliation

    Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutathione S-transferase omega-1
A
241Homo sapiensGene Names: GSTO1 (GSTTLP28)
EC: 1.8.5.1, 2.5.1.18, 1.20.4.2
Find proteins for P78417 (Homo sapiens)
Go to Gene View: GSTO1
Go to UniProtKB:  P78417
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
DTT
Query on DTT

Download SDF File 
Download CCD File 
A
2,3-DIHYDROXY-1,4-DITHIOBUTANE
1,4-DITHIOTHREITOL
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
 Ligand Interaction
GDS
Query on GDS

Download SDF File 
Download CCD File 
A
OXIDIZED GLUTATHIONE DISULFIDE
C20 H32 N6 O12 S2
YPZRWBKMTBYPTK-BJDJZHNGSA-N
 Ligand Interaction
1R4
Query on 1R4

Download SDF File 
Download CCD File 
A
L-gamma-glutamyl-S-[2-(4-nitrophenyl)-2-oxoethyl]-L-cysteinylglycine
S-(4-nitrophenacyl)glutathione
C18 H22 N4 O9 S
DFOFAMKKGYFIOO-STQMWFEESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.721 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.152 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 57.600α = 90.00
b = 57.600β = 90.00
c = 140.176γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
MOSFLMdata reduction
Blu-Icedata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-24
    Type: Initial release
  • Version 1.1: 2013-07-03
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Advisory, Refinement description