Structure of the major pilin protein (T3.2) from Streptococcus pyogenes serotype GAS13637

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

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Group AStreptococcusT Antigens Have a Highly Conserved Structure Concealed under a Heterogeneous Surface That Has Implications for Vaccine Design.

Young, P.G.Raynes, J.M.Loh, J.M.Proft, T.Baker, E.N.Moreland, N.J.

(2019) Infect Immun 87

  • DOI: https://doi.org/10.1128/IAI.00205-19

  • PubMed Abstract: 

    Group A Streptococcus (GAS) ( Streptococcus pyogenes ) is an important human pathogen associated with significant global morbidity and mortality for which there is no safe and efficacious vaccine. The T antigen, a protein that polymerizes to form the backbone of the GAS pilus structure, is a potential vaccine candidate. Previous surveys of the tee gene, which encodes the T antigen, have identified 21 different tee types and subtypes such that any T antigen-based vaccine must be multivalent and carefully designed to provide broad strain coverage. In this study, the crystal structures of three two-domain T antigens (T3.2, T13, and T18.1) were determined and found to have remarkable structural similarity to the previously reported T1 antigen, despite moderate overall sequence similarity. This has enabled reliable modeling of all major two-domain T antigens to reveal that T antigen sequence variation is distributed along the full length of the protein and shields a highly conserved core. Immunoassays performed with sera from immunized animals and commercial T-typing sera identified a significant cross-reactive antibody response between T18.1, T18.2, T3.2, and T13. The existence of shared epitopes between T antigens, combined with the remarkably conserved structure and high level of surface sequence divergence, has important implications for the design of multivalent T antigen-based vaccines.

  • Organizational Affiliation

    School of Biological Sciences, The University of Auckland, Auckland, New Zealand p.young@auckland.ac.nz n.moreland@auckland.ac.nz.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Major pilin backbone protein T-antigen, T3.2.
A, B
282Streptococcus pyogenesMutation(s): 0 
Gene Names: tee
Find proteins for A0A096ZHB0 (Streptococcus pyogenes)
Explore A0A096ZHB0 
Go to UniProtKB:  A0A096ZHB0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A096ZHB0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.05α = 90.77
b = 60.57β = 91.77
c = 72.79γ = 104.07
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Health Research Council (HRC)New Zealand--

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2019-06-19
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description