Crystal structure of choline oxidase S101A mutant

Experimental Data Snapshot

  • Resolution: 2.47 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

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Structural and kinetic studies on the Ser101Ala variant of choline oxidase: Catalysis by compromise.

Finnegan, S.Yuan, H.Wang, Y.F.Orville, A.M.Weber, I.T.Gadda, G.

(2010) Arch Biochem Biophys 501: 207-213

  • DOI: https://doi.org/10.1016/j.abb.2010.06.014
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The oxidation of choline catalyzed by choline oxidase includes two reductive half-reactions where FAD is reduced by the alcohol substrate and by an aldehyde intermediate transiently formed in the reaction. Each reductive half-reaction is followed by an oxidative half-reaction where the reduced flavin is oxidized by oxygen. Here, we have used mutagenesis to prepare the Ser101Ala mutant of choline oxidase and have investigated the impact of this mutation on the structural and kinetic properties of the enzyme. The crystallographic structure of the Ser101Ala enzyme indicates that the only differences between the mutant and wild-type enzymes are the lack of a hydroxyl group on residue 101 and a more planar configuration of the flavin in the mutant enzyme. Kinetics established that replacement of Ser101 with alanine yields a mutant enzyme with increased efficiencies in the oxidative half-reactions and decreased efficiencies in the reductive half-reactions. This is accompanied by a significant decrease in the overall rate of turnover with choline. Thus, this mutation has revealed the importance of a specific residue for the optimization of the overall turnover of choline oxidase, which requires fine-tuning of four consecutive half-reactions for the conversion of an alcohol to a carboxylic acid.

  • Organizational Affiliation

    Department of Chemistry, Georgia State University, Atlanta, GA 30302-4098, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Choline oxidase
A, B, C, D, E
A, B, C, D, E, F, G, H
546Arthrobacter globiformisMutation(s): 1 
Gene Names: codA
Find proteins for Q7X2H8 (Arthrobacter globiformis)
Explore Q7X2H8 
Go to UniProtKB:  Q7X2H8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7X2H8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
I [auth A]
K [auth B]
M [auth C]
O [auth D]
Q [auth E]
I [auth A],
K [auth B],
M [auth C],
O [auth D],
Q [auth E],
S [auth F],
U [auth G],
W [auth H]
C27 H33 N9 O15 P2
Query on ACT

Download Ideal Coordinates CCD File 
J [auth A]
L [auth B]
N [auth C]
P [auth D]
R [auth E]
J [auth A],
L [auth B],
N [auth C],
P [auth D],
R [auth E],
T [auth F],
V [auth G],
X [auth H]
C2 H3 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.47 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.258α = 90
b = 346.029β = 94.33
c = 105.919γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description