1EK2

CRYSTAL STRUCTURE OF MURINE SOLUBLE EPOXIDE HYDROLASE COMPLEXED WITH CDU INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Binding of alkylurea inhibitors to epoxide hydrolase implicates active site tyrosines in substrate activation.

Argiriadi, M.A.Morisseau, C.Goodrow, M.H.Dowdy, D.L.Hammock, B.D.Christianson, D.W.

(2000) J.Biol.Chem. 275: 15265-15270

  • DOI: 10.1074/jbc.M000278200
  • Primary Citation of Related Structures:  1EK1

  • PubMed Abstract: 
  • The structures of two alkylurea inhibitors complexed with murine soluble epoxide hydrolase have been determined by x-ray crystallographic methods. The alkyl substituents of each inhibitor make extensive hydrophobic contacts in the soluble epoxide hyd ...

    The structures of two alkylurea inhibitors complexed with murine soluble epoxide hydrolase have been determined by x-ray crystallographic methods. The alkyl substituents of each inhibitor make extensive hydrophobic contacts in the soluble epoxide hydrolase active site, and each urea carbonyl oxygen accepts hydrogen bonds from the phenolic hydroxyl groups of Tyr(381) and Tyr(465). These hydrogen bond interactions suggest that Tyr(381) and/or Tyr(465) are general acid catalysts that facilitate epoxide ring opening in the first step of the hydrolysis reaction; Tyr(465) is highly conserved among all epoxide hydrolases, and Tyr(381) is conserved among the soluble epoxide hydrolases. In one enzyme-inhibitor complex, the urea carbonyl oxygen additionally interacts with Gln(382). If a comparable interaction occurs in catalysis, then Gln(382) may provide electrostatic stabilization of partial negative charge on the epoxide oxygen. The carboxylate side chain of Asp(333) accepts a hydrogen bond from one of the urea NH groups in each enzyme-inhibitor complex. Because Asp(333) is the catalytic nucleophile, its interaction with the partial positive charge on the urea NH group mimics its approach toward the partial positive charge on the electrophilic carbon of an epoxide substrate. Accordingly, alkylurea inhibitors mimic features encountered in the reaction coordinate of epoxide ring opening, and a structure-based mechanism is proposed for leukotoxin epoxide hydrolysis.


    Related Citations: 
    • 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.USA 96: 10637


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EPOXIDE HYDROLASE
A, B
554Mus musculusGene Names: Ephx2 (Eph2)
EC: 3.1.3.76, 3.3.2.10
Find proteins for P34914 (Mus musculus)
Go to UniProtKB:  P34914
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CDU
Query on CDU

Download SDF File 
Download CCD File 
A, B
N-CYCLOHEXYL-N'-DECYLUREA
C17 H34 N2 O
LPXYBLIRYGCMPQ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CDUKi: 6.3 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.211 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 151.900α = 90.00
b = 143.000β = 90.00
c = 60.000γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
DENZOdata reduction
X-PLORmodel building
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-05-31
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance