Pilus-related Sortase C of Group B Streptococcus

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 

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This is version 1.3 of the entry. See complete history


Structure analysis and site-directed mutagenesis of defined key residues and motives for pilus-related sortase C1 in group B Streptococcus.

Cozzi, R.Malito, E.Nuccitelli, A.D'Onofrio, M.Martinelli, M.Ferlenghi, I.Grandi, G.Telford, J.L.Maione, D.Rinaudo, C.D.

(2011) FASEB J 25: 1874-1886

  • DOI: https://doi.org/10.1096/fj.10-174797
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In group B Streptococcus (GBS), 3 structurally distinct types of pili have been discovered as potential virulence factors and vaccine candidates. The pilus-forming proteins are assembled into high-molecular-weight polymers via a transpeptidation mechanism mediated by specific class C sortases. Using a multidisciplinary approach including bioinformatics, structural and biochemical studies, and in vivo mutagenesis, we performed a broad characterization of GBS sortase C1 of pilus island 2a. The high-resolution X-ray structure of the enzyme revealed that the active site, into the β-barrel core of the enzyme, is made of the catalytic triad His157-Cys219-Arg228 and covered by a loop, known as the "lid." We show that the catalytic triad and the predicted N- and C-terminal transmembrane regions are required for the enzyme activity. Interestingly, by in vivo complementation mutagenesis studies, we found that the deletion of the entire lid loop or mutations in specific lid key residues had no effect on catalytic activity of the enzyme. In addition, kinetic characterizations of recombinant enzymes indicate that the lid mutants can still recognize and cleave the substrate-mimicking peptide at least as well as the wild-type protein.

  • Organizational Affiliation

    Novartis Vaccines and Diagnostics, Via Fiorentina 1, 53100 Siena, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sortase family protein216Streptococcus agalactiae 515Mutation(s): 0 
Gene Names: Pilus Island 2a (PI-2a)SAL_1484
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.087α = 90
b = 37.354β = 96.68
c = 51.242γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-08-17
    Changes: Database references
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Refinement description