The crystal structure of an Acremonium strictum glucooligosaccharide oxidase reveals a novel flavinylation

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.180 

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Crystal structure of glucooligosaccharide oxidase from Acremonium strictum: a novel flavinylation of 6-S-cysteinyl, 8alpha-N1-histidyl FAD

Huang, C.H.Lai, W.L.Lee, M.H.Chen, C.J.Vasella, A.Tsai, Y.C.Liaw, S.H.

(2005) J Biol Chem 280: 38831-38838

  • DOI: https://doi.org/10.1074/jbc.M506078200
  • Primary Citation of Related Structures:  
    1ZR6, 2AXR

  • PubMed Abstract: 

    Glucooligosaccharide oxidase from Acremonium strictum has been screened for potential applications in oligosaccharide acid production and alternative carbohydrate detection, because it catalyzes the oxidation of glucose, maltose, lactose, cellobiose and cello- and maltooligosaccharides. We report the crystal structures of the enzyme and of its complex with an inhibitor, 5-amino-5-deoxy- cellobiono-1,5-lactam at 1.55- and 1.98-A resolution, respectively. Unexpectedly, the protein structure demonstrates the first known double attachment flavinylation, 6-S-cysteinyl, 8alpha-N1-histidyl FAD. The FAD cofactor is cross-linked to the enzyme via the C(6) atom and the 8alpha-methyl group of the isoalloxazine ring with Cys(130) and His(70), respectively. This sugar oxidase possesses an open carbohydrate-binding groove, allowing the accommodation of higher oligosaccharides. The complex structure suggests that this enzyme may prefer a beta-d-glucosyl residue at the reducing end with the conserved Tyr(429) acting as a general base to abstract the OH(1) proton in concert with the H(1) hydride transfer to the flavin N(5). Finally, a detailed comparison illustrates the structural conservation as well as the divergence between this protein and its related flavoenzymes.

  • Organizational Affiliation

    Structural Biology Program, Institute of Biochemistry, and Faculty of Life Science, National Yang-Ming University, Taipei 11221, Taiwan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
glucooligosaccharide oxidase503Sarocladium strictumMutation(s): 0 
EC: 1.1.3
Find proteins for Q6PW77 (Sarocladium strictum)
Explore Q6PW77 
Go to UniProtKB:  Q6PW77
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6PW77
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.084α = 90
b = 90.907β = 90
c = 111.679γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
OASISmodel building
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-13
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary