Crystal structure of SpGH29

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 

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Two complementary alpha-fucosidases fromStreptococcus pneumoniaepromote complete degradation of host-derived carbohydrate antigens.

Hobbs, J.K.Pluvinage, B.Robb, M.Smith, S.P.Boraston, A.B.

(2019) J Biol Chem 294: 12670-12682

  • DOI: https://doi.org/10.1074/jbc.RA119.009368
  • Primary Citation of Related Structures:  
    6OR4, 6ORF, 6ORG, 6ORH

  • PubMed Abstract: 

    An important aspect of the interaction between the opportunistic bacterial pathogen Streptococcus pneumoniae and its human host is its ability to harvest host glycans. The pneumococcus can degrade a variety of complex glycans, including N - and O -linked glycans, glycosaminoglycans, and carbohydrate antigens, an ability that is tightly linked to the virulence of S. pneumoniae Although S. pneumoniae is known to use a sophisticated enzyme machinery to attack the human glycome, how it copes with fucosylated glycans, which are primarily histo-blood group antigens, is largely unknown. Here, we identified two pneumococcal enzymes, Sp GH29 C and Sp GH95 C , that target α-(1→3/4) and α-(1→2) fucosidic linkages, respectively. X-ray crystallography studies combined with functional assays revealed that Sp GH29 C is specific for the Lewis A and Lewis X antigen motifs and that Sp GH95 C is specific for the H(O)-antigen motif. Together, these enzymes could defucosylate Lewis Y and Lewis B antigens in a complementary fashion. In vitro reconstruction of glycan degradation cascades disclosed that the individual or combined activities of these enzymes expose the underlying glycan structure, promoting the complete deconstruction of a glycan that would otherwise be resistant to pneumococcal enzymes. These experiments expand our understanding of the extensive capacity of S. pneumoniae to process host glycans and the likely roles of α-fucosidases in this. Overall, given the importance of enzymes that initiate glycan breakdown in pneumococcal virulence, such as the neuraminidase NanA and the mannosidase Sp GH92, we anticipate that the α-fucosidases identified here will be important factors in developing more refined models of the S. pneumoniae -host interaction.

  • Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8P 5C2, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycoside hydrolase
A, B
451Streptococcus pneumoniae TIGR4Mutation(s): 2 
Gene Names: SP_2146
Find proteins for A0A0H2US78 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2US78 
Go to UniProtKB:  A0A0H2US78
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2US78
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
C, D
Glycosylation Resources
GlyTouCan:  G39023AU
GlyCosmos:  G39023AU
GlyGen:  G39023AU
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.96α = 76.58
b = 68.82β = 73.24
c = 72.67γ = 73.61
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-07-17
    Changes: Data collection, Database references
  • Version 1.2: 2019-09-04
    Changes: Data collection, Database references
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence, Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2020-08-05
    Changes: Derived calculations, Structure summary
  • Version 2.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description, Structure summary