2OPE

Crystal structure of the Neisseria meningitidis minor Type IV pilin, PilX, in space group P43


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

3D structure/function analysis of PilX reveals how minor pilins can modulate the virulence properties of type IV pili.

Helaine, S.Dyer, D.H.Nassif, X.Pelicic, V.Forest, K.T.

(2007) Proc.Natl.Acad.Sci.Usa 104: 15888-15893

  • DOI: 10.1073/pnas.0707581104
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Type IV pili (Tfp) are widespread filamentous bacterial organelles that mediate multiple virulence-related phenotypes. They are composed mainly of pilin subunits, which are processed before filament assembly by dedicated prepilin peptidases. Other pr ...

    Type IV pili (Tfp) are widespread filamentous bacterial organelles that mediate multiple virulence-related phenotypes. They are composed mainly of pilin subunits, which are processed before filament assembly by dedicated prepilin peptidases. Other proteins processed by these peptidases, whose molecular nature and mode of action remain enigmatic, play critical roles in Tfp biology. We have performed a detailed structure/function analysis of one such protein, PilX from Neisseria meningitidis, which is crucial for formation of bacterial aggregates and adhesion to human cells. The x-ray crystal structure of PilX reveals the alpha/beta roll fold shared by all pilins, and we show that this protein colocalizes with Tfp. These observations suggest that PilX is a minor, or low abundance, pilin that assembles within the filaments in a similar way to pilin. Deletion of a PilX distinctive structural element, which is predicted to be exposed on the filament surface, abolishes aggregation and adhesion. Our results support a model in which surface-exposed motifs in PilX subunits stabilize bacterial aggregates against the disruptive force of pilus retraction and illustrate how a minor pilus component can enhance the functional properties of pili of rather simple composition and structure.


    Organizational Affiliation

    Institut National de la Santé et de la Recherche Médicale, U570, 75015 Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PilX
A, B, C, D
128Neisseria meningitidis serogroup A / serotype 4A (strain Z2491)Mutation(s): 0 
Find proteins for A0A0U1RIH2 (Neisseria meningitidis serogroup A / serotype 4A (strain Z2491))
Go to UniProtKB:  A0A0U1RIH2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.208 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 76.836α = 90.00
b = 76.836β = 90.00
c = 89.663γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
RESOLVEphasing
PROTEUM PLUSdata collection
SOLVEphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description