4S3L

Crystal Structure of major pilin protein PitB from type II pilus of Streptococcus pneumoniae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Structural Snapshot of Type II Pilus Formation in Streptococcus pneumoniae.

Shaik, M.M.Lombardi, C.Maragno Trindade, D.Fenel, D.Schoehn, G.Di Guilmi, A.M.Dessen, A.

(2015) J.Biol.Chem. 290: 22581-22592

  • DOI: 10.1074/jbc.M115.647834
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Pili are fibrous appendages expressed on the surface of a vast number of bacterial species, and their role in surface adhesion is important for processes such as infection, colonization, andbiofilm formation. The human pathogen Streptococcus pneumoni ...

    Pili are fibrous appendages expressed on the surface of a vast number of bacterial species, and their role in surface adhesion is important for processes such as infection, colonization, andbiofilm formation. The human pathogen Streptococcus pneumoniae expresses two different types of pili, PI-1 and PI-2, both of which require the concerted action of structural proteins and sortases for their polymerization. The type PI-1 streptococcal pilus is a complex, well studied structure, but the PI-2 type, present in a number of invasive pneumococcal serotypes, has to date remained less well understood. The PI-2 pilus consists of repeated units of a single protein, PitB, whose covalent association is catalyzed by cognate sortase SrtG-1 and partner protein SipA. Here we report the high resolution crystal structures of PitB and SrtG1 and use molecular modeling to visualize a "trapped" 1:1 complex between the two molecules. X-ray crystallography and electron microscopy reveal that the pneumococcal PI-2 backbone fiber is formed by PitB monomers associated in head-to-tail fashion and that short, flexible fibers can be formed even in the absence of coadjuvant proteins. These observations, obtained with a simple pilus biosynthetic system, are likely to be applicable to other fiber formation processes in a variety of Gram-positive organisms.


    Organizational Affiliation

    From the Université Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38044 Grenoble, France, CNRS, IBS, 38044 Grenoble, France, Commissariat à l'Energie Atomique, IBS, Grenoble, France, and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Major Pilin Protein
A, B
341Streptococcus pneumoniaeMutation(s): 0 
Gene Names: pitB
Find proteins for B3FNT1 (Streptococcus pneumoniae)
Go to UniProtKB:  B3FNT1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.239 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 54.210α = 90.00
b = 54.210β = 90.00
c = 361.410γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
PHENIXrefinement
MxCuBEdata collection
autoSHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-08-26
    Type: Database references
  • Version 1.2: 2015-10-07
    Type: Database references