Round 18 Arylesterase Variant of Apo-Phosphotriesterase Measured at 9.5 keV

Experimental Data Snapshot

  • Resolution: 1.52 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

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Mononuclear binding and catalytic activity of europium(III) and gadolinium(III) at the active site of the model metalloenzyme phosphotriesterase.

Breeze, C.W.Nakano, Y.Campbell, E.C.Frkic, R.L.Lupton, D.W.Jackson, C.J.

(2024) Acta Crystallogr D Struct Biol 80: 289-298

  • DOI: https://doi.org/10.1107/S2059798324002316
  • Primary Citation of Related Structures:  
    8UQW, 8UQX, 8UQY, 8UQZ

  • PubMed Abstract: 

    Lanthanide ions have ideal chemical properties for catalysis, such as hard Lewis acidity, fast ligand-exchange kinetics, high coordination-number preferences and low geometric requirements for coordination. As a result, many small-molecule lanthanide catalysts have been described in the literature. Yet, despite the ability of enzymes to catalyse highly stereoselective reactions under gentle conditions, very few lanthanoenzymes have been investigated. In this work, the mononuclear binding of europium(III) and gadolinium(III) to the active site of a mutant of the model enzyme phosphotriesterase are described using X-ray crystallography at 1.78 and 1.61 Å resolution, respectively. It is also shown that despite coordinating a single non-natural metal cation, the PTE-R18 mutant is still able to maintain esterase activity.

  • Organizational Affiliation

    Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphotriesterase variant PTE-R18
A, B
333Brevundimonas diminutaMutation(s): 0 
Find proteins for A0A060GYS7 (Brevundimonas diminuta)
Explore A0A060GYS7 
Go to UniProtKB:  A0A060GYS7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A060GYS7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.52 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.868α = 90
b = 86.498β = 90
c = 89.303γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaCE200100012

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-03
    Type: Initial release
  • Version 1.1: 2024-04-10
    Changes: Database references