The type 4 fimbrial subunit gene of pasteurella multocida

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S W Doughty1, C G Ruffolo, B Adler

  • 1Department of Microbiology, Monash University, Clayton, Australia. stephen.doughty@med.monash.edu.au

Veterinary Microbiology
|March 4, 2000
PubMed

Insights

This study isolated and characterized the PtfA gene, which encodes a type 4 fimbrial protein essential for Gram-negative bacteria colonization. Variations were found in the PtfA gene among different *P. multocida* strains.

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Gram-negative bacteria utilize adhesins, such as type 4 fimbriae (pili), to colonize host tissues.
  • Type 4 fimbriae are implicated in pathogenesis and mediating epithelial surface colonization in various bacterial species.
  • Type 4 fimbriae and their subunit protein (PtfA) have been recently identified and characterized in *P. multocida* strains.

Purpose of the Study:

  • To isolate and characterize the *ptfA* gene encoding the PtfA protein from *P. multocida* VP161 (serotype A:1).
  • To analyze the genetic variations within the *ptfA* gene across different *P. multocida* strains.

Main Methods:

  • Isolation and characterization of the *ptfA* gene using genomic DNA cloning and inverse PCR.
  • Sequencing and comparative analysis of the *ptfA* gene and its flanking regions.
  • Amplification and sequencing of the *ptfA* gene from multiple *P. multocida* isolates.

Main Results:

  • The complete *ptfA* gene was successfully isolated and characterized from *P. multocida* VP161.
  • The deduced PtfA amino acid sequence was compared with type 4 subunit proteins from other bacterial species.
  • Sequence analysis revealed variations within the type 4 subunit (*ptfA*) gene among different *P. multocida* strains.

Conclusions:

  • The *ptfA* gene is successfully isolated and characterized, providing insights into type 4 fimbriae production in *P. multocida*.
  • Identified variations in the *ptfA* gene suggest potential for genetic diversity and adaptation in *P. multocida* colonization mechanisms.
  • This research contributes to understanding the molecular basis of *P. multocida* pathogenesis and host interaction.

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