Glactose oxidase C383S mutant identified by directed evolution

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.228 

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Structural and kinetic studies of a series of mutants of galactose oxidase identified by directed evolution.

Wilkinson, D.Akumanyi, N.Hurtado-Guerrero, R.Dawkes, H.Knowles, P.F.Phillips, S.E.V.McPherson, M.J.

(2004) Protein Eng Des Sel 17: 141-148

  • DOI: https://doi.org/10.1093/protein/gzh018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Galactose oxidase (GO; E.C. is a copper- containing enzyme that oxidizes a range of primary alcohols to aldehydes. This broad substrate specificity is reflected in a high K(M) for substrates. Directed evolution has previously been used to select variants of GO that exhibit enhanced expression and kinetic properties. In assays using unpurified enzyme samples, the variant C383S displayed a 5-fold lower K(M) than wild-type GO. In the present study, we have constructed, expressed, purified and characterized a number of single, double and triple mutants at residues Cys383, Tyr436 and Val494, identified in one of the directed evolution studies, to examine their relative contributions to improved catalytic activity of GO. We report kinetic studies on the various mutant enzymes. In addition, we have determined the three-dimensional structure of the C383S variant. As with many mutations identified in directed evolution experiments, the availability of structural information does not provide a definitive answer to the reason for the improved K(M) in the C383S variant protein.

  • Organizational Affiliation

    Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Galactose Oxidase639Fusarium sp.Mutation(s): 0 
Gene Names: sac1
Find proteins for P0CS93 (Gibberella zeae)
Explore P0CS93 
Go to UniProtKB:  P0CS93
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0CS93
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.228 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.376α = 90
b = 88.995β = 117.49
c = 85.8γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-05-18
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description