3I2J

Cocaine Esterase, wild type, without a ligand


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural analysis of thermostabilizing mutations of cocaine esterase.

Narasimhan, D.Nance, M.R.Gao, D.Ko, M.C.Macdonald, J.Tamburi, P.Yoon, D.Landry, D.M.Woods, J.H.Zhan, C.G.Tesmer, J.J.Sunahara, R.K.

(2010) Protein Eng.Des.Sel. 23: 537-547

  • DOI: 10.1093/protein/gzq025
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cocaine is considered to be the most addictive of all substances of abuse and mediates its effects by inhibiting monoamine transporters, primarily the dopamine transporters. There are currently no small molecules that can be used to combat its toxic ...

    Cocaine is considered to be the most addictive of all substances of abuse and mediates its effects by inhibiting monoamine transporters, primarily the dopamine transporters. There are currently no small molecules that can be used to combat its toxic and addictive properties, in part because of the difficulty of developing compounds that inhibit cocaine binding without having intrinsic effects on dopamine transport. Most of the effective cocaine inhibitors also display addictive properties. We have recently reported the use of cocaine esterase (CocE) to accelerate the removal of systemic cocaine and to prevent cocaine-induced lethality. However, wild-type CocE is relatively unstable at physiological temperatures (tau(1/2) approximately 13 min at 37 degrees C), presenting challenges for its development as a viable therapeutic agent. We applied computational approaches to predict mutations to stabilize CocE and showed that several of these have increased stability both in vitro and in vivo, with the most efficacious mutant (T172R/G173Q) extending half-life up to 370 min. Here we present novel X-ray crystallographic data on these mutants that provide a plausible model for the observed enhanced stability. We also more extensively characterize the previously reported variants and report on a new stabilizing mutant, L169K. The improved stability of these engineered CocE enzymes will have a profound influence on the use of this protein to combat cocaine-induced toxicity and addiction in humans.


    Organizational Affiliation

    Department of Pharmacology, University of Michigan, Ann Arbor, MI, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cocaine esterase
A
587Rhodococcus sp. (strain MB1 Bresler)Mutation(s): 0 
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
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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

Download SDF File 
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: 2.01 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.167 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 105.801α = 90.00
b = 105.801β = 90.00
c = 222.238γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Refinement description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description