3GTU

LIGAND-FREE HETERODIMERIC HUMAN GLUTATHIONE S-TRANSFERASE M2-3 (EC 2.5.1.18), MONOCLINIC CRYSTAL FORM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

An asparagine-phenylalanine substitution accounts for catalytic differences between hGSTM3-3 and other human class mu glutathione S-transferases.

Patskovsky, Y.V.Patskovska, L.N.Listowsky, I.

(1999) Biochemistry 38: 16187-16194

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The hGSTM3 subunit, which is preferentially expressed in germ-line cells, has the greatest sequence divergence among the human mu class glutathione S-transferases. To determine a structural basis for the catalytic differences between hGSTM3-3 and oth ...

    The hGSTM3 subunit, which is preferentially expressed in germ-line cells, has the greatest sequence divergence among the human mu class glutathione S-transferases. To determine a structural basis for the catalytic differences between hGSTM3-3 and other mu class enzymes, chimeric proteins were designed by modular interchange of the divergent C-terminal domains of hGSTM3 and hGSTM5 subunits. Replacement of 24 residues of the C-terminal segment of either subunit produced chimeric enzymes with catalytic properties that reflected those of the wild-type enzyme from which the C-terminus had been derived. Deletion of the tripeptide C-terminal extension found only in the hGSTM3 subunit had no effect on catalysis. The crystal structure determined for a ligand-free hGSTM3 subunit indicates that an Asn212 residue of the C-terminal domain is near a hydrophobic cluster of side chains formed in part by Ile13, Leu16, Leu114, Ile115, Tyr119, Ile211, and Trp218. Accordingly, a series of point mutations were introduced into the hGSTM3 subunit, and it was indeed determined that a Y119F mutation considerably enhanced the turnover rate of the enzyme for nucleophilic aromatic substitution reactions. A more striking effect was observed for a double mutant (Y119F/N212F) which had a k(cat)/K(m)(CDNB) value of 7.6 x 10(5) s(-)(1) M(-)(1) as compared to 4.9 x 10(3) s(-)(1) M(-)(1) for the wild-type hGSTM3-3 enzyme. The presence of a polar Asn212 in place of a Phe residue found in the cognate position of other mu class glutathione S-transferases, therefore, has a marked influence on catalysis by hGSTM3-3.


    Related Citations: 
    • Cloning, Expression, and Characterization of a Class-Mu Glutathione Transferase from Human Muscle, the Product of the Gst4 Locus
      Vorachek, W.R.,Pearson, W.R.,Rule, G.S.
      (1991) Proc.Natl.Acad.Sci.USA 88: 4443
    • Crystal Structure of Human Class Mu Glutathione Transferase Gstm2-2. Effects of Lattice Packing on Conformational Heterogeneity
      Raghunathan, S.,Chandross, R.J.,Kretsinger, R.H.,Allison, T.J.,Penington, C.J.,Rule, G.S.
      (1994) J.Mol.Biol. 238: 815
    • A Distinct Human Testis and Brain Mu-Class Glutathione S-Transferase. Molecular Cloning and Characterization of a Form Present Even in Individuals Lacking Hepatic Type Mu Isoenzymes
      Campbell, E.,Takahashi, Y.,Abramovitz, M.,Peretz, M.,Listowsky, I.
      (1990) J.Biol.Chem. 265: 9188


    Organizational Affiliation

    Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GLUTATHIONE S-TRANSFERASE
A, C
217Homo sapiensMutation(s): 0 
Gene Names: GSTM2 (GST4)
EC: 2.5.1.18
Find proteins for P28161 (Homo sapiens)
Go to Gene View: GSTM2
Go to UniProtKB:  P28161
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GLUTATHIONE S-TRANSFERASE
B, D
224Homo sapiensMutation(s): 0 
Gene Names: GSTM3 (GST5)
EC: 2.5.1.18
Find proteins for P21266 (Homo sapiens)
Go to Gene View: GSTM3
Go to UniProtKB:  P21266
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.225 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 51.970α = 90.00
b = 102.747β = 95.80
c = 103.977γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
XDSdata reduction
XSCALEdata scaling
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-07-29
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance