Multicopper Oxidase CueO (data5)

Experimental Data Snapshot

  • Resolution: 1.06 Å
  • R-Value Observed: 0.127 

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This is version 1.2 of the entry. See complete history


Structure and function of the engineered multicopper oxidase CueO from Escherichia coli--deletion of the methionine-rich helical region covering the substrate-binding site.

Kataoka, K.Komori, H.Ueki, Y.Konno, Y.Kamitaka, Y.Kurose, S.Tsujimura, S.Higuchi, Y.Kano, K.Seo, D.Sakurai, T.

(2007) J Mol Biol 373: 141-152

  • DOI: https://doi.org/10.1016/j.jmb.2007.07.041
  • Primary Citation of Related Structures:  
    2YXV, 2YXW, 4E9Q, 4E9R, 4E9S, 4E9T

  • PubMed Abstract: 

    CueO is a multicopper oxidase (MCO) that is involved in the homeostasis of Cu in Escherichia coli and is the sole cuprous oxidase to have ever been found. Differing from other MCOs, the substrate-binding site of CueO is deeply buried under a methionine-rich helical region including alpha-helices 5, 6, and 7 that interfere with the access of organic substrates. We deleted the region Pro357-His406 and replaced it with a Gly-Gly linker. The crystal structures of a truncated mutant in the presence and in the absence of excess Cu(II) indicated that the scaffold of the CueO molecule and metal-binding sites were reserved in comparison with those of CueO. In addition, the high thermostability of the protein molecule and its spectroscopic and magnetic properties due to four Cu centers were also conserved after truncation. As for functions, the cuprous oxidase activity of the mutant was reduced to ca 10% that of recombinant CueO owing to the decrease in the affinity of the labile Cu site for Cu(I) ions, although activities for laccase substrates such as 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), p-phenylenediamine, and 2,6-dimethoxyphenol increased due to changes in the access of these organic substrates to the type I Cu site. The present engineering of CueO indicates that the methionine-rich alpha-helices function as a barrier to the access of bulky organic substrates, which provides CueO with specificity as a cuprous oxidase.

  • Organizational Affiliation

    Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Blue copper oxidase CueO489Escherichia coli K-12Mutation(s): 0 
Gene Names: cueOyacKb0123JW0119
Find proteins for P36649 (Escherichia coli (strain K12))
Explore P36649 
Go to UniProtKB:  P36649
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP36649
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.06 Å
  • R-Value Observed: 0.127 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.392α = 90
b = 90.757β = 102.69
c = 53.317γ = 90
Software Package:
Software NamePurpose
SHELXmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-01
    Type: Initial release
  • Version 1.1: 2013-07-24
    Changes: Database references
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations