Catalytic Module of the Multi-modular glycogen-degrading pneumococcal virulence factor SpuA

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.175 

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This is version 1.3 of the entry. See complete history


The Conformation and Function of a Multimodular Glycogen-Degrading Pneumococcal Virulence Factor.

Lammerts Van Bueren, A.Ficko-Blean, E.Pluvinage, B.Hehemann, J.Higgins, M.A.Deng, L.Ogunniyi, A.D.Stroeher, U.H.El Warry, N.Burke, R.D.Czjzek, M.Paton, J.C.Vocadlo, D.J.Boraston, A.B.

(2011) Structure 19: 640

  • DOI: https://doi.org/10.1016/j.str.2011.03.001
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    SpuA is a large multimodular cell wall-attached enzyme involved in the degradation of glycogen by the pathogenic bacterium Streptococcus pneumoniae. The deletion of the gene encoding SpuA from the bacterium resulted in a strain with reduced competitiveness in a mouse model of virulence relative to the parent strain, linking the degradation of host-glycogen to the virulence of the bacterium. Through the combined use of X-ray crystallography, small-angle X-ray scattering, and inhibitor binding, the molecular features involved in substrate recognition by this complex protein are revealed. This uniquely illustrates the complexity of the active site, the conformational changes incurred during carbohydrate binding by this protein, and the interaction and cooperation of its composite modules during this process. New insight into the function of this particular pneumococcal virulence factor is provided along with substantial contributions to the nascent framework for understanding the structural and functional interplay between modules in multimodular carbohydrate-active enzymes.

  • Organizational Affiliation

    Biochemistry & Microbiology, University of Victoria, Victoria, BC, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PUTATIVE ALKALINE AMYLOPULLULANASE714Streptococcus pneumoniae TIGR4Mutation(s): 0 
Find proteins for A0A0H2UNG0 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2UNG0 
Go to UniProtKB:  A0A0H2UNG0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2UNG0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.574α = 90
b = 75.196β = 97.31
c = 87.038γ = 90
Software Package:
Software NamePurpose
CrystalCleardata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2011-04-20
    Type: Initial release
  • Version 1.1: 2013-07-31
    Changes: Database references
  • Version 1.2: 2017-07-05
    Changes: Data collection
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description