5D6H

Crystal structure of CsuC-CsuA/B chaperone-major subunit pre-assembly complex from Csu biofilm-mediating pili of Acinetobacter baumannii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insight into Archaic and Alternative Chaperone-Usher Pathways Reveals a Novel Mechanism of Pilus Biogenesis.

Pakharukova, N.Garnett, J.A.Tuittila, M.Paavilainen, S.Diallo, M.Xu, Y.Matthews, S.J.Zavialov, A.V.

(2015) Plos Pathog. 11: e1005269-e1005269

  • DOI: 10.1371/journal.ppat.1005269
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gram-negative pathogens express fibrous adhesive organelles that mediate targeting to sites of infection. The major class of these organelles is assembled via the classical, alternative and archaic chaperone-usher pathways. Although non-classical sys ...

    Gram-negative pathogens express fibrous adhesive organelles that mediate targeting to sites of infection. The major class of these organelles is assembled via the classical, alternative and archaic chaperone-usher pathways. Although non-classical systems share a wider phylogenetic distribution and are associated with a range of diseases, little is known about their assembly mechanisms. Here we report atomic-resolution insight into the structure and biogenesis of Acinetobacter baumannii Csu and Escherichia coli ECP biofilm-mediating pili. We show that the two non-classical systems are structurally related, but their assembly mechanism is strikingly different from the classical assembly pathway. Non-classical chaperones, unlike their classical counterparts, maintain subunits in a substantially disordered conformational state, akin to a molten globule. This is achieved by a unique binding mechanism involving the register-shifted donor strand complementation and a different subunit carboxylate anchor. The subunit lacks the classical pre-folded initiation site for donor strand exchange, suggesting that recognition of its exposed hydrophobic core starts the assembly process and provides fresh inspiration for the design of inhibitors targeting chaperone-usher systems.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction analysis of the Csu pili CsuC-CsuA/B chaperone-major subunit pre-assembly complex from Acinetobacter baumannii
      Pakharukova, N.,Paavilainen, S.,Tuitila, M.,Zavialov, A.
      (2015) Acta Cryst F71: 770


    Organizational Affiliation

    Department of Chemistry, University of Turku, Turku, JBL, Arcanum, Turku, Finland.,Centre for Structural Biology, Department of Life Sciences, Imperial College London, South Kensington, London, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CsuC
A
243Acinetobacter baumanniiMutation(s): 0 
Gene Names: csuC
Find proteins for Q6XBY4 (Acinetobacter baumannii)
Go to UniProtKB:  Q6XBY4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CsuA/B
B
152Acinetobacter baumanniiMutation(s): 0 
Gene Names: csuA/B
Find proteins for Q6XBY7 (Acinetobacter baumannii)
Go to UniProtKB:  Q6XBY7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 
  • Space Group: P 64 2 2
Unit Cell:
Length (Å)Angle (°)
a = 94.705α = 90.00
b = 94.705β = 90.00
c = 187.048γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
XDSdata reduction
PHENIXphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Academy of FinlandFinland136333
Academy of FinlandFinland14095

Revision History 

  • Version 1.0: 2015-11-04
    Type: Initial release
  • Version 1.1: 2015-12-02
    Type: Database references