3E3H

Crystal structure of the OP hydrolase mutant from Brevundimonas diminuta


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Balancing the stability and the catalytic specificities of OP hydrolases with enhanced V-agent activities.

Reeves, T.E.Wales, M.E.Grimsley, J.K.Li, P.Cerasoli, D.M.Wild, J.R.

(2008) Protein Eng Des Sel 21: 405-412

  • DOI: https://doi.org/10.1093/protein/gzn019
  • Primary Citation of Related Structures:  
    3E3H

  • PubMed Abstract: 

    Rational site-directed mutagenesis and biophysical analyses have been used to explore the thermodynamic stability and catalytic capabilities of organophosphorus hydrolase (OPH) and its genetically modified variants. There are clear trade-offs in the stability of modifications that enhance catalytic activities. For example, the H254R/H257L variant has higher turnover numbers for the chemical warfare agents VX (144 versus 14 s(-1) for the native enzyme (wild type) and VR (Russian VX, 465 versus 12 s(-1) for wild type). These increases are accompanied by a loss in stability in which the total Gibb's free energy for unfolding is 19.6 kcal/mol, which is 5.7 kcal/mol less than that of the wild-type enzyme. X-ray crystallographic studies support biophysical data that suggest amino acid residues near the active site contribute to the chemical and thermal stability through hydrophobic and cation-pi interactions. The cation-pi interactions appear to contribute an additional 7 kcal/mol to the overall global stability of the enzyme. Using rational design, it has been possible to make amino acid changes in this region that restored the stability, yet maintained effective V-agent activities, with turnover numbers of 68 and 36 s(-1) for VX and VR, respectively. This study describes the first rationally designed, stability/activity balance for an OPH enzyme with a legitimate V-agent activity, and its crystal structure.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, TAMU 2128, Texas A&M University, College Station, TX 77843-2128, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Parathion hydrolase
A, B
336Brevundimonas diminutaMutation(s): 2 
Gene Names: opd
EC: 3.1.8.1
UniProt
Find proteins for P0A434 (Brevundimonas diminuta)
Explore P0A434 
Go to UniProtKB:  P0A434
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A434
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.797α = 90
b = 90.596β = 91.74
c = 69.145γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-10-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-08-30
    Changes: Data collection, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection