Asp170Ser mutant of vanillyl-alcohol oxidase

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 

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Asp170 is Crucial for the Redox Properties of Vanillyl-Alcohol Oxidase

Van Den Heuvel, R.H.H.Fraaije, M.W.Mattevi, A.Van Berkel, W.J.H.

(2000) J Biol Chem 275: 14799

  • DOI: https://doi.org/10.1074/jbc.275.20.14799
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Vanillyl-alcohol oxidase is a flavoprotein containing a covalent flavin that catalyzes the oxidation of 4-(methoxymethyl)phenol to 4-hydroxybenzaldehyde. The reaction proceeds through the formation of a p-quinone methide intermediate, after which, water addition takes place. Asp-170, located near the N5-atom of the flavin, has been proposed to act as an active site base. To test this hypothesis, we have addressed the properties of D170E, D170S, D170A, and D170N variants. Spectral and fluorescence analysis, together with the crystal structure of D170S, suggests that the Asp-170 replacements do not induce major structural changes. However, in D170A and D170N, 50 and 100%, respectively, of the flavin is non-covalently bound. Kinetic characterization of the vanillyl-alcohol oxidase variants revealed that Asp-170 is required for catalysis. D170E is 50-fold less active, and the other Asp-170 variants are about 10(3)-fold less active than wild type enzyme. Impaired catalysis of the Asp-170 variants is caused by slow flavin reduction. Furthermore, the mutant proteins have lost the capability of forming a stable complex between reduced enzyme and the p-quinone methide intermediate. The redox midpoint potentials in D170E (+6 mV) and D170S (-91 mV) are considerably decreased compared with wild type vanillyl-alcohol oxidase (+55 mV). This supports the idea that Asp-170 interacts with the protonated N5-atom of the reduced cofactor, thus increasing the FAD redox potential. Taken together, we conclude that Asp-170 is involved in the process of autocatalytic flavinylation and is crucial for efficient redox catalysis.

  • Organizational Affiliation

    Department of Biomolecular Sciences, Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
560Penicillium simplicissimumMutation(s): 1 
Gene Names: VAOA
Find proteins for P56216 (Penicillium simplicissimum)
Explore P56216 
Go to UniProtKB:  P56216
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56216
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.33α = 90
b = 131.33β = 90
c = 134.66γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-03-07
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-06
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description