Crystal Structure of Sortase C-3 (SRTC-3) from Streptococcus pneumoniae

Experimental Data Snapshot

  • Resolution: 2.14 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

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Sortase-Mediated Pilus Fiber Biogenesis in Streptococcus Pneumoniae.

Manzano, C.Contreras-Martel, C.El Mortaji, L.Izore, T.Fenel, D.Vernet, T.Schoehn, G.Di Guilmi, A.M.Dessen, A.

(2008) Structure 16: 1838

  • DOI: https://doi.org/10.1016/j.str.2008.10.007
  • Primary Citation of Related Structures:  
    2W1J, 2W1K

  • PubMed Abstract: 

    Streptococcus pneumoniae is a piliated pathogen whose ability to circumvent vaccination and antibiotic treatment strategies is a cause of mortality worldwide. Pili play important roles in pneumococcal infection, but little is known about their biogenesis mechanism or the relationship between components of the pilus-forming machinery, which includes the fiber pilin (RrgB), two minor pilins (RrgA, RrgC), and three sortases (SrtC-1, SrtC-2, SrtC-3). Here we show that SrtC-1 is the main pilus-polymerizing transpeptidase, and electron microscopy analyses of RrgB fibers reconstituted in vitro reveal that they structurally mimic the pneumococcal pilus backbone. Crystal structures of both SrtC-1 and SrtC-3 reveal active sites whose access is controlled by flexible lids, unlike in non-pilus sortases, and suggest that substrate specificity is dictated by surface recognition coupled to lid opening. The distinct structural features of pilus-forming sortases suggest a common pilus biogenesis mechanism that could be exploited for the development of broad-spectrum antibacterials.

  • Organizational Affiliation

    Laboratoire des Protéines Membranaires, Institut de Biologie Structurale Jean-Pierre Ebel, UMR 5075 (CEA, CNRS, UJF, PSB), 41 rue Jules Horowitz, F-38027 Grenoble, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
252Streptococcus pneumoniae TIGR4Mutation(s): 0 
Find proteins for A7KT36 (Streptococcus pneumoniae)
Explore A7KT36 
Go to UniProtKB:  A7KT36
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA7KT36
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MES

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C6 H13 N O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.14 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.638α = 90
b = 122.638β = 90
c = 122.638γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2018-05-23
    Changes: Data collection, Structure summary
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description