The tip fimbrial protein Mfa3 from Porphyromonas gingivalis with C-terminal truncation.

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.151 

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Structural and functional characterization of shaft, anchor, and tip proteins of the Mfa1 fimbria from the periodontal pathogen Porphyromonas gingivalis.

Hall, M.Hasegawa, Y.Yoshimura, F.Persson, K.

(2018) Sci Rep 8: 1793-1793

  • DOI: https://doi.org/10.1038/s41598-018-20067-z
  • Primary Citation of Related Structures:  
    5NF2, 5NF3, 5NF4, 5NFI

  • PubMed Abstract: 

    Very little is known about how fimbriae of Bacteroidetes bacteria are assembled. To shed more light on this process, we solved the crystal structures of the shaft protein Mfa1, the regulatory protein Mfa2, and the tip protein Mfa3 from the periodontal pathogen Porphyromonas gingivalis. Together these build up part of the Mfa1 fimbria and represent three of the five proteins, Mfa1-5, encoded by the mfa1 gene cluster. Mfa1, Mfa2 and Mfa3 have the same overall fold i.e., two β-sandwich domains. Upon polymerization, the first β-strand of the shaft or tip protein is removed by indigenous proteases. Although the resulting void is expected to be filled by a donor-strand from another fimbrial protein, the mechanism by which it does so is still not established. In contrast, the first β-strand in Mfa2, the anchoring protein, is firmly attached by a disulphide bond and is not cleaved. Based on the structural information, we created multiple mutations in P. gingivalis and analysed their effect on fimbrial polymerization and assembly in vivo. Collectively, these data suggest an important role for the C-terminal tail of Mfa1, but not of Mfa3, affecting both polymerization and maturation of downstream fimbrial proteins.

  • Organizational Affiliation

    Department of Chemistry, Umeå University, Umeå, SE-901 85, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Minor fimbrium tip subunit Mfa3
A, B
451Porphyromonas gingivalis ATCC 33277Mutation(s): 0 
Gene Names: mfa3PGN_0289
Find proteins for B2RHG3 (Porphyromonas gingivalis (strain ATCC 33277 / DSM 20709 / CIP 103683 / JCM 12257 / NCTC 11834 / 2561))
Explore B2RHG3 
Go to UniProtKB:  B2RHG3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2RHG3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.151 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.183α = 90
b = 80.183β = 90
c = 116.022γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden2016-05009
Japan Society for the Promotion of ScienceJapan16K11466

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-07
    Type: Initial release