3I2K

Cocaine Esterase, wild type, bound to a DTT adduct

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.51 Å
  • R-Value Free: 0.152 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.146 

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Ligand Structure Quality Assessment 


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:  
    3I2F, 3I2G, 3I2H, 3I2I, 3I2J, 3I2K

  • 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 and addictive properties, in part because of the difficulty of developing compounds that inhibit cocaine binding without having intrinsic effects on dopamine transport ...

    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: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cocaine esteraseA587Rhodococcus sp. MB1 'Bresler 1999Mutation(s): 0 
Gene Names: cocE
EC: 3.1.1 (PDB Primary Data), 3.1.1.84 (UniProt)
UniProt
Find proteins for Q9L9D7 (Rhodococcus sp. (strain MB1 Bresler))
Explore Q9L9D7 
Go to UniProtKB:  Q9L9D7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9L9D7
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DBC
Query on DBC
Download Ideal Coordinates CCD File 
E [auth A](4S,5S)-4,5-BIS(MERCAPTOMETHYL)-1,3-DIOXOLAN-2-OL
C5 H10 O3 S2
URSOFHABYVLXDS-QWWZWVQMSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
I [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A]		GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A],
J [auth A],
K [auth A],
B [auth A],
C [auth A],
D [auth A],
J [auth A],
K [auth A],
L [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.51 Å
  • R-Value Free: 0.152 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.146 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.513α = 90
b = 105.513β = 90
c = 222.377γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

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