1LZK

BACTERIAL HEROIN ESTERASE COMPLEX WITH TRANSITION STATE ANALOG DIMETHYLARSENIC ACID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

OBSERVATION OF AN ARSENIC ADDUCT IN AN ACETYL ESTERASE CRYSTAL STRUCTURE

ZHU, X.LARSEN, N.A.BASRAN, A.BRUCE, N.C.WILSON, I.A.

(2003) J Biol Chem 278: 2008-2014

  • DOI: 10.1074/jbc.M210103200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The crystal structures of an acetyl esterase, HerE, and its complex with an inhibitor dimethylarsinic acid have been determined at 1.30- and 1.45-A resolution, respectively. Although the natural substrate for the enzyme is unknown, HerE hydrolyzes th ...

    The crystal structures of an acetyl esterase, HerE, and its complex with an inhibitor dimethylarsinic acid have been determined at 1.30- and 1.45-A resolution, respectively. Although the natural substrate for the enzyme is unknown, HerE hydrolyzes the acetyl groups from heroin to yield morphine and from phenyl acetate to yield phenol. Recently, the activity of the enzyme toward heroin has been exploited to develop a heroin biosensor, which affords higher sensitivity than other currently available detection methods. The crystal structure reveals a single domain with the canonical alpha/beta hydrolase fold with an acyl binding pocket that snugly accommodates the acetyl substituent of the substrate and three backbone amides that form a tripartite oxyanion hole. In addition, a covalent adduct was observed between the active site serine and dimethylarsinic acid, which inhibits the enzyme. This crystal structure provides the first example of an As-containing compound in a serine esterase active site and the first example of covalent modification of serine by arsenic. Thus, the HerE complex reveals the structural basis for the broad scope inhibition of serine hydrolases by As(V)-containing organic compounds.


    Organizational Affiliation

    Department of Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, 92037, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEROIN ESTERASEA323Rhodococcus sp.Mutation(s): 4 
Gene Names: her
Find proteins for O06441 (Rhodococcus sp)
Explore O06441 
Go to UniProtKB:  O06441
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CAC
Query on CAC

Download CCD File 
A
CACODYLATE ION
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.157 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.584α = 90
b = 71.584β = 90
c = 106.17γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SOLVEphasing
RESOLVEmodel building
SHELXL-97refinement
HKL-2000data scaling
RESOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance