Crystal structure of Pseudomonas oleovorans PoOPH mutant H250I/I263W

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

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Switching a newly discovered lactonase into an efficient and thermostable phosphotriesterase by simple double mutations His250Ile/Ile263Trp

Luo, X.J.Kong, X.D.Zhao, J.Chen, Q.Zhou, J.Xu, J.H.

(2014) Biotechnol Bioeng 111: 1920-1930

  • DOI: https://doi.org/10.1002/bit.25272
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    OPHC2 is a thermostable organophosphate (OP) hydrolase in the β-lactamase superfamily. OPs are highly toxic synthetic chemicals with no natural analogs. How did OPHC2 acquire phosphotriesterase (PTE) activity remained unclear. In this study, an OPHC2 analogue, PoOPH was discovered from Pseudomonas oleovorans exhibiting high lactonase and esterase activities and latent PTE activity. Sequence analysis revealed conserved His250 and Ile263 and site-directed mutagenesis at these crucial residues enhanced PTE activity. The best variant PoOPHM2 carrying H250I/I263W mutations displayed 6,962- and 106-fold improvements in catalytic efficiency for methyl-parathion and ethyl-paraoxon degradation, whereas the original lactonase and esterase activities decreased dramatically. A 1.4 × 10(7) -fold of specificity inversion was achieved by only two residue substitutions. Significantly, thermostability of the variants was not compromised. Crystal structure of PoOPHM2 was determined at 2.25 Å resolution and docking studies suggested that the two residues in the binding pocket determine substrate recognition. Lastly, new organophosphorus hydrolases (OPHs) were discovered using simple double mutations. Among them, PpOPHM2 from Pseudomonas putida emerged as a new promising OPH with very high activity (41.0 U mg(-1) ) toward methyl-parathion. Our results offer a first scrutiny to PTE activity evolution of OPHs in β-lactamase superfamily and provide efficient and robust enzymes for OP detoxification.

  • Organizational Affiliation

    State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
organophosphorus hydrolase
A, B
337Pseudomonas oleovoransMutation(s): 0 
Gene Names: OPHC
Find proteins for A0A0B4J186 (Pseudomonas oleovorans)
Explore A0A0B4J186 
Go to UniProtKB:  A0A0B4J186
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0B4J186
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.742α = 90
b = 116.742β = 90
c = 83.395γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description