Dichelobacter nodosus pilin FimA

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Ultrahigh Resolution and Full-length Pilin Structures with Insights for Filament Assembly, Pathogenic Functions, and Vaccine Potential.

Hartung, S.Arvai, A.S.Wood, T.Kolappan, S.Shin, D.S.Craig, L.Tainer, J.A.

(2011) J Biol Chem 286: 44254-44265

  • DOI: https://doi.org/10.1074/jbc.M111.297242
  • Primary Citation of Related Structures:  
    3SOJ, 3SOK

  • PubMed Abstract: 

    Pilin proteins assemble into Type IV pili (T4P), surface-displayed bacterial filaments with virulence functions including motility, attachment, transformation, immune escape, and colony formation. However, challenges in crystallizing full-length fiber-forming and membrane protein pilins leave unanswered questions regarding pilin structures, assembly, functions, and vaccine potential. Here we report pilin structures of full-length DnFimA from the sheep pathogen Dichelobacter nodosus and FtPilE from the human pathogen Francisella tularensis at 2.3 and 1 Å resolution, respectively. The DnFimA structure reveals an extended kinked N-terminal α-helix, an unusual centrally located disulfide, conserved subdomains, and assembled epitopes informing serogroup vaccines. An interaction between the conserved Glu-5 carboxyl oxygen and the N-terminal amine of an adjacent subunit in the crystallographic dimer is consistent with the hypothesis of a salt bridge between these groups driving T4P assembly. The FtPilE structure identifies an authentic Type IV pilin and provides a framework for understanding the role of T4P in F. tularensis virulence. Combined results define a unified pilin architecture, specialized subdomain roles in pilus assembly and function, and potential therapeutic targets.

  • Organizational Affiliation

    Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fimbrial protein
A, B
151Dichelobacter nodosusMutation(s): 0 
Gene Names: fimA
Membrane Entity: Yes 
Find proteins for P02975 (Dichelobacter nodosus)
Explore P02975 
Go to UniProtKB:  P02975
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02975
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.239 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.729α = 90
b = 105.729β = 90
c = 73.848γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-02
    Type: Initial release
  • Version 1.1: 2012-01-04
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Refinement description