1MTC

GLUTATHIONE TRANSFERASE MUTANT Y115F


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Local protein dynamics and catalysis: detection of segmental motion associated with rate-limiting product release by a glutathione transferase

Codreanu, S.G.Ladner, J.E.Xiao, G.Stourman, N.V.Hachey, D.L.Gilliland, G.L.Armstrong, R.N.

(2002) Biochemistry 41: 15161-15172


  • PubMed Abstract: 
  • Glutathione transferase rGSTM1-1 catalyzes the addition of glutathione (GSH) to 1-chloro-2,4-dinitrobenzene, a reaction in which the chemical step is 60-fold faster than the physical step of product release. The hydroxyl group of Y115, located in the ...

    Glutathione transferase rGSTM1-1 catalyzes the addition of glutathione (GSH) to 1-chloro-2,4-dinitrobenzene, a reaction in which the chemical step is 60-fold faster than the physical step of product release. The hydroxyl group of Y115, located in the active site access channel, controls the egress of product from the active site. The Y115F mutant enzyme has a k(cat) (72 s(-)(1)) that is 3.6-fold larger than that of the native enzyme (20 s(-)(1)). Crystallographic observations and evidence from amide proton exchange kinetics are consistent with localized increases in the degree of segmental motion of the Y115F mutant that are coupled to the enhanced rate of product release. The loss of hydrogen bonding interactions involving the hydroxyl group of Y115 is reflected in subtle alterations in the backbone position, an increase in B-factors for structural elements that comprise the channel to the active site, and, most dramatically, a loss of well-defined electron density near the site of mutation. The kinetics of amide proton exchange are also enhanced by a factor between 3 and 12 in these regions, providing direct, quantitative evidence for changes in local protein dynamics affecting product release. The enhanced product release rate is proposed to derive from a small shift in the equilibrium population of protein conformers that permit egress of the product from the active site.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutathione S-transferase YB1
A, B
217Rattus norvegicusGene Names: Gstm1
EC: 2.5.1.18
Find proteins for P04905 (Rattus norvegicus)
Go to UniProtKB:  P04905
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GPR
Query on GPR

Download SDF File 
Download CCD File 
A, B
(9R,10R)-9-(S-GLUTATHIONYL)-10-HYDROXY-9,10-DIHYDROPHENANTHRENE
C24 H27 N3 O7 S
JNNIZILNBMPOAC-MOXQZVSFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 86.750α = 90.00
b = 68.580β = 105.12
c = 80.460γ = 90.00
Software Package:
Software NamePurpose
X-GENdata reduction
X-GENdata scaling
SHELXL-97refinement
SHELXSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description