3BG7

Pyranose 2-oxidase from Trametes multicolor, L537G mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Improving thermostability and catalytic activity of pyranose 2-oxidase from Trametes multicolor by rational and semi-rational design

Spadiut, O.Leitner, C.Salaheddin, C.Varga, B.Vertessy, B.G.Tan, T.C.Divne, C.Haltrich, D.

(2009) FEBS J 276: 776-792

  • DOI: 10.1111/j.1742-4658.2008.06823.x
  • Primary Citation of Related Structures:  
    3BG6, 3BG7, 3BLY

  • PubMed Abstract: 
  • The fungal homotetrameric flavoprotein pyranose 2-oxidase (P2Ox; EC 1.1.3.10) catalyses the oxidation of various sugars at position C2, while, concomitantly, electrons are transferred to oxygen as well as to alternative electron acceptors (e.g. oxidized ferrocenes) ...

    The fungal homotetrameric flavoprotein pyranose 2-oxidase (P2Ox; EC 1.1.3.10) catalyses the oxidation of various sugars at position C2, while, concomitantly, electrons are transferred to oxygen as well as to alternative electron acceptors (e.g. oxidized ferrocenes). These properties make P2Ox an interesting enzyme for various biotechnological applications. Random mutagenesis has previously been used to identify variant E542K, which shows increased thermostability. In the present study, we selected position Leu537 for saturation mutagenesis, and identified variants L537G and L537W, which are characterized by a higher stability and improved catalytic properties. We report detailed studies on both thermodynamic and kinetic stability, as well as the kinetic properties of the mutational variants E542K, E542R, L537G and L537W, and the respective double mutants (L537G/E542K, L537G/E542R, L537W/E542K and L537W/E542R). The selected substitutions at positions Leu537 and Glu542 increase the melting temperature by approximately 10 and 14 degrees C, respectively, relative to the wild-type enzyme. Although both wild-type and single mutants showed first-order inactivation kinetics, thermal unfolding and inactivation was more complex for the double mutants, showing two distinct phases, as revealed by microcalorimetry and CD spectroscopy. Structural information on the variants does not provide a definitive answer with respect to the stabilizing effects or the alteration of the unfolding process. Distinct differences, however, are observed for the P2Ox Leu537 variants at the interfaces between the subunits, which results in tighter association.


    Organizational Affiliation

    Department of Food Sciences and Technology, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Pyranose oxidaseA, B, C, D, E, F, G, H623Trametes ochraceaMutation(s): 1 
Gene Names: p2o
EC: 1.1.3.10
Find proteins for Q7ZA32 (Trametes ochracea)
Explore Q7ZA32 
Go to UniProtKB:  Q7ZA32
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download CCD File 
A, B, C, D, E, F, G, H
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.156 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 168.54α = 90
b = 103.18β = 106.45
c = 169.34γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
XDSdata reduction
XSCALEdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Data collection, Refinement description