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: 2.40 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.224 

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:  
    5D6H, 5DFK

  • 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 systems ...

    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 Crystallogr F Struct Biol Commun F71: 770
    Organizational Affiliation: 

    Department of Chemistry, University of Turku, Turku, JBL, Arcanum, Turku, Finland.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CsuC A243Acinetobacter baumanniiMutation(s): 0 
Gene Names: csuC
Find proteins for Q6XBY4 (Acinetobacter baumannii)
Explore Q6XBY4 
Go to UniProtKB:  Q6XBY4
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CsuA/B B152Acinetobacter baumanniiMutation(s): 0 
Gene Names: csuA/B
Find proteins for Q6XBY7 (Acinetobacter baumannii)
Explore Q6XBY7 
Go to UniProtKB:  Q6XBY7
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.224 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.705α = 90
b = 94.705β = 90
c = 187.048γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
PHENIXphasing
XDSdata reduction

Structure Validation

View Full Validation Report


View more in-depth experimental data

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
    Changes: Database references