Biological Assembly 1  

 3D View: Structure

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: 125.16 kDa 
• Atom Count: 8218 
• Modelled Residue Count: 1028 
• Deposited Residue Count: 1108 
• Unique protein chains: 1

1CQZ

CRYSTAL STRUCTURE OF MURINE SOLUBLE EPOXIDE HYDROLASE.

• DOI: 10.2210/pdb1CQZ/pdb

• Classification: HYDROLASE
• Organism(s): Mus musculus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 1999-08-12 Released: 1999-11-19 
• Deposition Author(s): Argiriadi, M.A., Morisseau, C., Hammock, B.D., Christianson, D.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.309 
• R-Value Work: 0.214 
• R-Value Observed: 0.269 

Literature

Detoxification of environmental mutagens and carcinogens: structure, mechanism, and evolution of liver epoxide hydrolase.

Argiriadi, M.A., Morisseau, C., Hammock, B.D., Christianson, D.W.

(1999) Proc Natl Acad Sci U S A 96: 10637-10642

• PubMed: 10485878 
• DOI: 10.1073/pnas.96.19.10637
• Primary Citation of Related Structures:  
  1CQZ, 1CR6


• PubMed Abstract: 
  

The crystal structure of recombinant murine liver cytosolic epoxide hydrolase (EC 3.3.2.3) has been determined at 2.8-A resolution. The binding of a nanomolar affinity inhibitor confirms the active site location in the C-terminal domain; this domain is similar to that of haloalkane dehalogenase and shares the alpha/beta hydrolase fold. A structure-based mechanism is proposed that illuminates the unique chemical strategy for the activation of endogenous and man-made epoxide substrates for hydrolysis and detoxification. Surprisingly, a vestigial active site is found in the N-terminal domain similar to that of another enzyme of halocarbon metabolism, haloacid dehalogenase. Although the vestigial active site does not participate in epoxide hydrolysis, the vestigial domain plays a critical structural role by stabilizing the dimer in a distinctive domain-swapped architecture. Given the genetic and structural relationships among these enzymes of xenobiotic metabolism, a structure-based evolutionary sequence is postulated.

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Related Citations: 

• Molecular cloning and expression of murine liver soluble epoxide hydrolase
  Grant, D.F., Storms, D.H., Hammock, B.D.
  (1993) J Biol Chem 268: 17628

• Gene evolution of epoxide hydrolases and recommended nomenclature
  Beetham, J.K., Grant, D., Arand, M., Garbarino, J., Kiyosue, T., Pinot, F., Oesch, F., Belknap, W.R., Shinozaki, K., Hammock, B.D.
  (1995) DNA Cell Biol 14: 61

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Organizational Affiliation: 

Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
EPOXIDE HYDROLASE	A, B	554	Mus musculus	Mutation(s): 0  Gene Names: Ephx2, Eph2 EC: 3.3.2.3 (PDB Primary Data), 3.3.2.10 (UniProt), 3.1.3.76 (UniProt)
UniProt
Find proteins for P34914 (Mus musculus) Explore P34914  Go to UniProtKB:  P34914

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.309 
• R-Value Work: 0.214 
• R-Value Observed: 0.269 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 151.9	α = 90
b = 143	β = 90
c = 60	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-08-12 
• Released Date: 1999-11-19 
Deposition Author(s): Argiriadi, M.A., Morisseau, C., Hammock, B.D., Christianson, D.W.

Revision History  

• Version 1.0: 1999-11-19
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance