4D12

Crystal Structure of Cofactor-free Urate Oxidase Anaerobically Complexed with Uric Acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.142 
  • R-Value Work: 0.118 
  • R-Value Observed: 0.119 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Direct evidence for a peroxide intermediate and a reactive enzyme-substrate-dioxygen configuration in a cofactor-free oxidase.

Bui, S.von Stetten, D.Jambrina, P.G.Prange, T.Colloc'h, N.de Sanctis, D.Royant, A.Rosta, E.Steiner, R.A.

(2014) Angew Chem Int Ed Engl 53: 13710-13714

  • DOI: 10.1002/anie.201405485
  • Primary Citation of Related Structures:  
    4CW0, 4CW2, 4CW3, 4CW6, 4D12, 4D13, 4D17, 4D19

  • PubMed Abstract: 
  • Cofactor-free oxidases and oxygenases promote and control the reactivity of O2 with limited chemical tools at their disposal. Their mechanism of action is not completely understood and structural information is not available for any of the reaction intermediates ...

    Cofactor-free oxidases and oxygenases promote and control the reactivity of O2 with limited chemical tools at their disposal. Their mechanism of action is not completely understood and structural information is not available for any of the reaction intermediates. Near-atomic resolution crystallography supported by in crystallo Raman spectroscopy and QM/MM calculations showed unambiguously that the archetypical cofactor-free uricase catalyzes uric acid degradation via a C5(S)-(hydro)peroxide intermediate. Low X-ray doses break specifically the intermediate C5-OO(H) bond at 100 K, thus releasing O2 in situ, which is trapped above the substrate radical. The dose-dependent rate of bond rupture followed by combined crystallographic and Raman analysis indicates that ionizing radiation kick-starts both peroxide decomposition and its regeneration. Peroxidation can be explained by a mechanism in which the substrate radical recombines with superoxide transiently produced in the active site.


    Organizational Affiliation

    Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL (UK).



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
URICASEA302Aspergillus flavusMutation(s): 0 
Gene Names: uaZuox
EC: 1.7.3.3
UniProt
Find proteins for Q00511 (Aspergillus flavus)
Explore Q00511 
Go to UniProtKB:  Q00511
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ00511
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
URC
Query on URC

Download Ideal Coordinates CCD File 
C [auth A]URIC ACID
C5 H4 N4 O3
LEHOTFFKMJEONL-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

Download Ideal Coordinates CCD File 
B [auth A](4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.142 
  • R-Value Work: 0.118 
  • R-Value Observed: 0.119 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.918α = 90
b = 94.87β = 90
c = 104.15γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrysalisProdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

  • Deposited Date: 2014-05-01 
  • Released Date: 2014-10-29 
  • Deposition Author(s): Bui, S., Steiner, R.A.

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-29
    Type: Initial release
  • Version 1.1: 2014-12-17
    Changes: Database references
  • Version 1.2: 2018-01-10
    Changes: Database references, Structure summary
  • Version 1.3: 2018-02-21
    Changes: Database references