Full-Length PAK Pilin from Pseudomonas aeruginosa

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.225 

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This is version 1.3 of the entry. See complete history


Type IV Pilin Structure and Assembly: X-Ray and EM Analyses of Vibrio cholerae Toxin-Coregulated Pilus and Pseudomonas aeruginosa PAK Pilin

Craig, L.Taylor, R.K.Pique, M.E.Adair, B.A.Arvai, A.S.Singh, M.Lloyd, S.J.Shin, D.S.Getzoff, E.D.Yeager, M.Forest, K.T.Tainer, J.A.

(2003) Mol Cell 11: 1139-1150

  • DOI: https://doi.org/10.1016/s1097-2765(03)00170-9
  • Primary Citation of Related Structures:  
    1OQV, 1OQW

  • PubMed Abstract: 

    Pilin assembly into type IV pili is required for virulence by bacterial pathogens that cause diseases such as cholera, pneumonia, gonorrhea, and meningitis. Crystal structures of soluble, N-terminally truncated pilin from Vibrio cholera toxin-coregulated pilus (TCP) and full-length PAK pilin from Pseudomonas aeruginosa reveal a novel TCP fold, yet a shared architecture for the type IV pilins. In each pilin subunit a conserved, extended, N-terminal alpha helix wrapped by beta strands anchors the structurally variable globular head. Inside the assembled pilus, characterized by cryo-electron microscopy and crystallography, the extended hydrophobic alpha helices make multisubunit contacts to provide mechanical strength and flexibility. Outside, distinct interactions of adaptable heads contribute surface variation for specificity of pilus function in antigenicity, motility, adhesion, and colony formation.

  • Organizational Affiliation

    Department of Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fimbrial protein
A, B
144Pseudomonas aeruginosaMutation(s): 0 
Membrane Entity: Yes 
Find proteins for P02973 (Pseudomonas aeruginosa)
Explore P02973 
Go to UniProtKB:  P02973
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02973
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.225 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 147.015α = 90
b = 44.422β = 116.82
c = 73.782γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Refinement description