4P08

Engineered thermostable dimeric cocaine esterase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.341 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Rational design, preparation, and characterization of a therapeutic enzyme mutant with improved stability and function for cocaine detoxification.

Fang, L.Chow, K.M.Hou, S.Xue, L.Chen, X.Rodgers, D.W.Zheng, F.Zhan, C.G.

(2014) Acs Chem.Biol. 9: 1764-1772

  • DOI: 10.1021/cb500257s

  • PubMed Abstract: 
  • Cocaine esterase (CocE) is known as the most efficient natural enzyme for cocaine hydrolysis. The major obstacle to the clinical application of wild-type CocE is the thermoinstability with a half-life of only ∼12 min at 37 °C. The previously designed ...

    Cocaine esterase (CocE) is known as the most efficient natural enzyme for cocaine hydrolysis. The major obstacle to the clinical application of wild-type CocE is the thermoinstability with a half-life of only ∼12 min at 37 °C. The previously designed T172R/G173Q mutant (denoted as enzyme E172-173) with an improved in vitro half-life of ∼6 h at 37 °C is currently in clinical trial Phase II for cocaine overdose treatment. Through molecular modeling and dynamics simulation, we designed and characterized a promising new mutant of E172-173 with extra L196C/I301C mutations (denoted as enzyme E196-301) to produce cross-subunit disulfide bonds that stabilize the dimer structure. The cross-subunit disulfide bonds were confirmed by X-ray diffraction. The designed L196C/I301C mutations have not only considerably extended the in vitro half-life at 37 °C to >100 days, but also significantly improved the catalytic efficiency against cocaine by ∼150%. In addition, the thermostable E196-301 can be PEGylated to significantly prolong the residence time in mice. The PEGylated E196-301 can fully protect mice from a lethal dose of cocaine (180 mg/kg, LD100) for at least 3 days, with an average protection time of ∼94h. This is the longest in vivo protection of mice from the lethal dose of cocaine demonstrated within all studies using an exogenous enzyme reported so far. Hence, E196-301 may be developed to become a more valuable therapeutic enzyme for cocaine abuse treatment, and it demonstrates that a general design strategy and protocol to simultaneously improve both the stability and function are feasible for rational protein drug design.


    Organizational Affiliation

    Molecular Modeling and Biopharmaceutical Center and Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky , 789 South Limestone Street, Lexington, Kentucky 40536, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cocaine esterase
A
571Rhodococcus sp. (strain MB1 Bresler)Mutation(s): 4 
Gene Names: cocE
EC: 3.1.1.84
Find proteins for Q9L9D7 (Rhodococcus sp. (strain MB1 Bresler))
Go to UniProtKB:  Q9L9D7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.341 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.177 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 106.647α = 90.00
b = 106.647β = 90.00
c = 220.532γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Drug AbuseUnited StatesDA035552
National Institutes of Health/National Institute on Drug AbuseUnited StatesDA032910
National Institutes of Health/National Institute on Drug AbuseUnited StatesDA013930
National Institutes of Health/National Institute on Drug AbuseUnited StatesDA025100
National Institutes of Health/National Institute of General Medical SciencesUnited StatesP20GM103486

Revision History 

  • Version 1.0: 2014-07-16
    Type: Initial release
  • Version 1.1: 2014-10-01
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Derived calculations, Other, Refinement description, Source and taxonomy