1B48

CRYSTAL STRUCTURE OF MGSTA4-4 IN COMPLEX WITH GSH CONJUGATE OF 4-HYDROXYNONENAL IN ONE SUBUNIT AND GSH IN THE OTHER: EVIDENCE OF SIGNALING ACROSS DIMER INTERFACE IN MGSTA4-4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a murine glutathione S-transferase in complex with a glutathione conjugate of 4-hydroxynon-2-enal in one subunit and glutathione in the other: evidence of signaling across the dimer interface.

Xiao, B.Singh, S.P.Nanduri, B.Awasthi, Y.C.Zimniak, P.Ji, X.

(1999) Biochemistry 38: 11887-11894


  • PubMed Abstract: 
  • mGSTA4-4, a murine glutathione S-transferase (GST) exhibiting high activity in conjugating the lipid peroxidation product 4-hydroxynon-2-enal (4-HNE) with glutathione (GSH), was crystallized in complex with the GSH conjugate of 4-HNE (GS-Hna). The st ...

    mGSTA4-4, a murine glutathione S-transferase (GST) exhibiting high activity in conjugating the lipid peroxidation product 4-hydroxynon-2-enal (4-HNE) with glutathione (GSH), was crystallized in complex with the GSH conjugate of 4-HNE (GS-Hna). The structure has been solved at 2.6 A resolution, which reveals that the active site of one subunit of the dimeric enzyme binds GS-Hna, whereas the other binds GSH. A marked asymmetry between the two subunits is evident. Most noticeable are the differences in the conformation of arginine residues 69 and 15. In all GST structures published previously, the guanidino groups of R69 residues from both subunits stack at the dimer interface and are related by a (pseudo-) 2-fold axis. In the present structure of mGSTA4-4, however, the two R69 side chains point in opposite directions, although their guanidino groups remain in contact. In the subunit with bound GSH, R69 also interacts with R15, and the guanidino group of R15 points away from the active site, whereas in the subunit that binds GS-Hna, R15 pivots into the active site, which breaks its interaction with R69. According to our previous results [Nanduri et al. (1997) Arch. Biochem. Biophys. 335, 305-310], the availability of R15 in the active site assists the conjugation of 4-HNE with GSH. We propose a model for the catalytic mechanism of mGSTA4-4 in conjugating 4-HNE with GSH-i.e., the guanidino group of R15 is available in the active site of only one subunit at any given time and the stacked pair of R69 residues act as a switch that couples the concerted movement of the two R15 side chains. The alternate occupancy of 4-HNE in the two subunits has been confirmed by our kinetic analysis that shows the negative cooperativity of mGSTA4-4 for 4-HNE. Disruption of the signaling between the subunits by mutating the R69 residues released the negative cooperativity with 4-HNE.


    Related Citations: 
    • Crystal Structure of a Murine Alpha-Class Glutathione S-Transferase Involved in Cellular Defense Against Oxidative Stress
      Krengel, U.,Schroter, K.H.,Hoier, H.,Arkema, A.,Kalk, K.H.,Zimniak, P.,Dijkstra, B.W.
      (1998) FEBS Lett. 422: 285


    Organizational Affiliation

    ABL-Basic Research Program, NCI-Frederick Cancer Research and Development Center, Maryland 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (GLUTATHIONE S-TRANSFERASE)
A, B
221Mus musculusGene Names: Gsta4 (Gsta)
EC: 2.5.1.18
Find proteins for P24472 (Mus musculus)
Go to UniProtKB:  P24472
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSH
Query on GSH

Download SDF File 
Download CCD File 
B
GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
 Ligand Interaction
HAG
Query on HAG

Download SDF File 
Download CCD File 
A
4-S-GLUTATHIONYL-5-PENTYL-TETRAHYDRO-FURAN-2-OL
GSHNA
C19 H33 N3 O8 S
ICRIFHIWWXQBPY-JEJJNBGPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.244 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 114.450α = 90.00
b = 96.140β = 90.00
c = 50.840γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
HKL-2000data reduction
X-PLORrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-09-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance