3FDY

Pyranose 2-oxidase thermostable triple mutant, T169G/E542K/V546C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A thermostable triple mutant of pyranose 2-oxidase from Trametes multicolor with improved properties for biotechnological applications

Spadiut, O.Radakovits, K.Pisanelli, I.Salaheddin, C.Yamabhai, M.Tan, T.-C.Divne, C.Haltrich, D.

(2009) Biotechnol J 4: 525-534

  • DOI: 10.1002/biot.200800260

  • PubMed Abstract: 
  • In order to increase the thermal stability and the catalytic properties of pyranose oxidase (P2Ox) from Trametes multicolor toward its poor substrate D-galactose and the alternative electron acceptor 1,4-benzoquinone (1,4-BQ), we designed the triple- ...

    In order to increase the thermal stability and the catalytic properties of pyranose oxidase (P2Ox) from Trametes multicolor toward its poor substrate D-galactose and the alternative electron acceptor 1,4-benzoquinone (1,4-BQ), we designed the triple-mutant T169G/E542K/V546C. Whereas the wild-type enzyme clearly favors D-glucose as its substrate over D-galactose [substrate selectivity (k(cat)/K(M))(Glc)/(k(cat)/K(M))(Gal) = 172], the variant oxidizes both sugars equally well [(k(cat)/K(M))(Glc)/(k(cat)/K(M))(Gal) = 0.69], which is of interest for food biotechnology. Furthermore, the variant showed lower K(M) values and approximately ten-fold higher k(cat) values for 1,4-BQ when D-galactose was used as the saturating sugar substrate, which makes this enzyme particularly attractive for use in biofuel cells and enzyme-based biosensors. In addition to the altered substrate specificity and reactivity, this mutant also shows significantly improved thermal stability. The half life time at 60 degrees C was approximately 10 h, compared to 7.6 min for the wild-type enzyme. We performed successfully small-scale bioreactor pilot conversion experiments of D-glucose/D-galactose mixtures at both 30 and 50 degrees C, showing the usefulness of this P2Ox variant in biocatalysis as well as the enhanced thermal stability of the enzyme. Moreover, we determined the crystal structure of the mutant in its unligated form at 1.55 A resolution. Modeling D-galactose in position for oxidation at C2 into the mutant active site shows that substituting Thr for Gly at position 169 favorably accommodates the axial C4 hydroxyl group that would otherwise clash with Thr169 in the wild-type.


    Organizational Affiliation

    Department of Food Sciences and Technology, BOKU, Vienna, Austria.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pyranose oxidase (Pyranose 2-oxidase)
A
623Trametes ochraceaMutation(s): 3 
Gene Names: p2o
EC: 1.1.3.10
Find proteins for Q7ZA32 (Trametes ochracea)
Go to UniProtKB:  Q7ZA32
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download SDF File 
Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 101.580α = 90.00
b = 101.580β = 90.00
c = 126.850γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
REFMACrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-11-26 
  • Released Date: 2009-03-31 
  • Deposition Author(s): Tan, T.C., Divne, C.

Revision History 

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2018-05-23
    Type: Data collection