Pyranose 2-oxidase T169S mutant

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

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This is version 1.5 of the entry. See complete history


A conserved active-site threonine is important for both sugar and flavin oxidations of pyranose 2-oxidase.

Pitsawong, W.Sucharitakul, J.Prongjit, M.Tan, T.C.Spadiut, O.Haltrich, D.Divne, C.Chaiyen, P.

(2010) J Biol Chem 285: 9697-9705

  • DOI: https://doi.org/10.1074/jbc.M109.073247
  • Primary Citation of Related Structures:  
    3K4B, 3K4C

  • PubMed Abstract: 

    Pyranose 2-oxidase (P2O) catalyzes the oxidation by O(2) of d-glucose and several aldopyranoses to yield the 2-ketoaldoses and H(2)O(2). Based on crystal structures, in one rotamer conformation, the threonine hydroxyl of Thr(169) forms H-bonds to the flavin-N5/O4 locus, whereas, in a different rotamer, it may interact with either sugar or other parts of the P2O.sugar complex. Transient kinetics of wild-type (WT) and Thr(169) --> S/N/G/A replacement variants show that D-Glc binds to T169S, T169N, and WT with the same K(d) (45-47 mm), and the hydride transfer rate constants (k(red)) are similar (15.3-9.7 s(-1) at 4 degrees C). k(red) of T169G with D-glucose (0.7 s(-1), 4 degrees C) is significantly less than that of WT but not as severely affected as in T169A (k(red) of 0.03 s(-1) at 25 degrees C). Transient kinetics of WT and mutants using d-galactose show that P2O binds d-galactose with a one-step binding process, different from binding of d-glucose. In T169S, T169N, and T169G, the overall turnover with d-Gal is faster than that of WT due to an increase of k(red). In the crystal structure of T169S, Ser(169) O gamma assumes a position identical to that of O gamma 1 in Thr(169); in T169G, solvent molecules may be able to rescue H-bonding. Our data suggest that a competent reductive half-reaction requires a side chain at position 169 that is able to form an H-bond within the ES complex. During the oxidative half-reaction, all mutants failed to stabilize a C4a-hydroperoxyflavin intermediate, thus suggesting that the precise position and geometry of the Thr(169) side chain are required for intermediate stabilization.

  • Organizational Affiliation

    Department of Biochemistry and Center of Excellence in Protein Structure and Function, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pyranose 2-oxidase623Trametes ochraceaMutation(s): 1 
Gene Names: p2o
Find proteins for Q7ZA32 (Trametes ochracea)
Explore Q7ZA32 
Go to UniProtKB:  Q7ZA32
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7ZA32
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
C27 H33 N9 O15 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.95α = 90
b = 101.95β = 90
c = 127.626γ = 90
Software Package:
Software NamePurpose
MAR345data collection
XDSdata reduction
XSCALEdata 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: 2010-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2014-11-12
    Changes: Structure summary
  • Version 1.3: 2017-11-01
    Changes: Data collection, Refinement description
  • Version 1.4: 2021-10-13
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-09-06
    Changes: Data collection, Refinement description