3KLQ

Crystal Structure of the Minor Pilin FctB from Streptococcus pyogenes 90/306S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the minor pilin FctB reveals determinants of Group A streptococcal pilus anchoring

Linke, C.Young, P.G.Kang, H.J.Bunker, R.D.Middleditch, M.J.Caradoc-Davies, T.T.Proft, T.Baker, E.N.

(2010) J Biol Chem 285: 20381-20389

  • DOI: https://doi.org/10.1074/jbc.M109.089680
  • Primary Citation of Related Structures:  
    3KLQ

  • PubMed Abstract: 

    Cell surface pili are polymeric protein assemblies that enable bacteria to adhere to surfaces and to specific host tissues. The pili expressed by Gram-positive bacteria constitute a unique paradigm in which sortase-mediated covalent linkages join successive pilin subunits like beads on a string. These pili are formed from two or three distinct types of pilin subunit, typically encoded in small gene clusters, often with their cognate sortases. In Group A streptococci (GAS), a major pilin forms the polymeric backbone, whereas two minor pilins are located at the tip and the base. Here, we report the 1.9-A resolution crystal structure of the GAS basal pilin FctB, revealing an immunoglobulin (Ig)-like N-terminal domain with an extended proline-rich tail. Unexpected structural homology between the FctB Ig-like domain and the N-terminal domain of the GAS shaft pilin helps explain the use of the same sortase for polymerization of the shaft and its attachment to FctB. It also enabled the identification, from mass spectral data, of the lysine residue involved in the covalent linkage of FctB to the shaft. The proline-rich tail forms a polyproline-II helix that appears to be a common feature of the basal (cell wall-anchoring) pilins. Together, our results indicate distinct structural elements in the pilin proteins that play a role in selecting for the appropriate sortases and thereby help orchestrate the ordered assembly of the pilus.


  • Organizational Affiliation

    School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative pilus anchoring protein
A, B
141Streptococcus pyogenesMutation(s): 0 
Gene Names: fctB
UniProt
Find proteins for D2KPJ6 (Streptococcus pyogenes)
Explore D2KPJ6 
Go to UniProtKB:  D2KPJ6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD2KPJ6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.192α = 90
b = 95.192β = 90
c = 100.46γ = 120
Software Package:
Software NamePurpose
SCALAdata processing
PHENIXrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-04-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations