3IDA

Thermostable Cocaine Esterase with mutations L169K and G173Q, bound to DTT adduct


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A thermally stable form of bacterial cocaine esterase: a potential therapeutic agent for treatment of cocaine abuse.

Brim, R.L.Nance, M.R.Youngstrom, D.W.Narasimhan, D.Zhan, C.G.Tesmer, J.J.Sunahara, R.K.Woods, J.H.

(2010) Mol.Pharmacol. 77: 593-600

  • DOI: 10.1124/mol.109.060806

  • PubMed Abstract: 
  • Rhodococcal cocaine esterase (CocE) is an attractive potential treatment for both cocaine overdose and cocaine addiction. CocE directly degrades cocaine into inactive products, whereas traditional small-molecule approaches require blockade of the inh ...

    Rhodococcal cocaine esterase (CocE) is an attractive potential treatment for both cocaine overdose and cocaine addiction. CocE directly degrades cocaine into inactive products, whereas traditional small-molecule approaches require blockade of the inhibitory action of cocaine on a diverse array of monoamine transporters and ion channels. The usefulness of wild-type (wt) cocaine esterase is hampered by its inactivation at 37 degrees C. Herein, we characterize the most thermostable form of this enzyme to date, CocE-L169K/G173Q. In vitro kinetic analyses reveal that CocE-L169K/G173Q displays a half-life of 2.9 days at 37 degrees C, which represents a 340-fold improvement over wt and is 15-fold greater than previously reported mutants. Crystallographic analyses of CocE-L169K/G173Q, determined at 1.6-A resolution, suggest that stabilization involves enhanced domain-domain interactions involving van der Waals interactions and hydrogen bonding. In vivo rodent studies reveal that intravenous pretreatment with CocE-L169K/G173Q in mice provides protection from cocaine-induced lethality for longer time periods before cocaine administration than wt CocE. Furthermore, intravenous administration (pretreatment) of CocE-L169K/G173Q prevents self-administration of cocaine in a time-dependent manner. Termination of the in vivo effects of CoCE seems to be dependent on, but not proportional to, its clearance from plasma as its half-life is approximately 2.3 h and similar to that of wt CocE (2.2 h). Taken together these data suggest that CocE-L169K/G173Q possesses many of the properties of a biological therapeutic for treating cocaine abuse but requires additional development to improve its serum half-life.


    Organizational Affiliation

    Department of Pharmacology, University of Michigan Medical School, 1301 Medical Sciences Research Building III, 1150 W Medical Center Drive, Ann Arbor, MI 48109-0600, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cocaine esterase
A
587Rhodococcus sp. (strain MB1 Bresler)Mutation(s): 2 
Gene Names: cocE
EC: 3.1.1.84
Find proteins for Q9L9D7 (Rhodococcus sp. (strain MB1 Bresler))
Go to UniProtKB:  Q9L9D7
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DBC
Query on DBC

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Download CCD File 
A
(4S,5S)-4,5-BIS(MERCAPTOMETHYL)-1,3-DIOXOLAN-2-OL
C5 H10 O3 S2
URSOFHABYVLXDS-QWWZWVQMSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.177 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 108.280α = 90.00
b = 108.280β = 90.00
c = 227.212γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance