Crystal structure of D298K copper amine oxidase from Arthrobacter globiformis

Experimental Data Snapshot

  • Resolution: 1.68 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 

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Trapping of a dopaquinone intermediate in the TPQ cofactor biogenesis in a copper-containing amine oxidase from Arthrobacter globiformis.

Moore, R.H.Spies, M.A.Culpepper, M.B.Murakawa, T.Hirota, S.Okajima, T.Tanizawa, K.Mure, M.

(2007) J Am Chem Soc 129: 11524-11534

  • DOI: https://doi.org/10.1021/ja0731165
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The biogenesis of the topaquinone (TPQ) cofactor of copper amine oxidase (CAO) is self-catalyzed and requires copper and molecular oxygen. A dopaquinone intermediate has been proposed to undergo 1,4-addition of a copper-associated water molecule to form the reduced form of TPQ (TPQ(red)), followed by facile oxidation by O(2) to yield the mature TPQ (TPQ(ox)). In this study, we have incorporated a lysine residue in the active site of Arthrobacter globiformis CAO (AGAO) by site-directed mutagenesis to produce D298K-AGAO. The X-ray crystal structure of D298K-AGAO at 1.7-A resolution revealed that a covalent linkage formed between the epsilon-amino side chain of Lys298 and the C2 position of a dopaquinone derived from Tyr382, a precursor to TPQ(ox). We assigned the species as an iminoquinone tautomer (LTI) of lysine tyrosylquinone (LTQ), the organic cofactor of lysyl oxidase (LOX). The time course of the formation of LTI at pH 6.8 was followed by UV/vis and resonance Raman spectroscopies. In the early phase of the reaction, an LTQ-like intermediate was observed. This intermediate then slowly converted to LTI in an isosbestic manner. Not only is the presence of a dopaquinone intermediate in the TPQ biogenesis confirmed, but it also provides strong support for the proposed intermediacy of a dopaquinone in the biogenesis of LTQ in LOX. Further, this study indicates that the dopaquinone intermediate in AGAO is mobile and can swing from the copper site into the active-site wedge to react with Lys298.

  • Organizational Affiliation

    Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phenylethylamine oxidase
A, B
638Arthrobacter globiformisMutation(s): 1 
Find proteins for P46881 (Arthrobacter globiformis)
Explore P46881 
Go to UniProtKB:  P46881
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46881
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on DPQ
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.68 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 
  • Space Group: I 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 158.012α = 90
b = 63.027β = 111.96
c = 184.119γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-10-25
    Changes: Data collection, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection, Derived calculations