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Updated: Aug 19, 2026

Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions
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[Enteropathogenic yersinias: pathogenicity factors and new diagnostic methods]

J Heesemann1

  • 1Institut für Hygiene und Mikrobiologie der Universität Würzburg.

Immunitat Und Infektion
|December 1, 1990
PubMed

Insights

Molecular biology advances understanding of human pathogenic Yersinia species. Plasmid-encoded proteins are key virulence factors and better diagnostic antigens for yersiniosis than whole bacterial antigens.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Immunology

Background:

  • Certain Yersinia enterocolitica and Y. pseudotuberculosis serotypes cause human enteropathogenic infections.
  • Molecular biology has significantly advanced the understanding of Yersinia pathogenicity in the last decade.

Purpose of the Study:

  • To elucidate the role of plasmid-encoded factors in Yersinia pathogenicity.
  • To identify suitable antigens for serologic diagnosis of yersiniosis.

Main Methods:

  • Identification of plasmid-encoded polypeptides.
  • Characterization of plasmid-mediated pathogenic functions.
  • Analysis of chromosomal determinants including invasion factors, enterotoxin, and iron-utilization systems.
  • Serologic diagnosis using immunoblotting and indirect immunofluorescence.

Main Results:

  • Human pathogenic Yersiniae possess a 70-kilobase virulence plasmid.
  • Thirteen plasmid-encoded polypeptides identified; two are outer membrane proteins, ten are secreted.
  • Plasmid functions include serum survival, phagocytosis resistance, cell adhesion, and cytotoxicity.
  • Chromosomal factors include invasion determinants, heat-stable enterotoxin, and an iron-utilization system.
  • Iron-uptake system contributes to mouse lethality.
  • Plasmid-encoded proteins are superior antigens for diagnosing yersiniosis compared to whole bacterial antigens.

Conclusions:

  • The 70-kilobase plasmid is essential for virulence in pathogenic Yersinia species.
  • Plasmid-encoded proteins are crucial for Yersinia pathogenesis and serve as effective diagnostic targets.
  • Molecular insights into Yersinia pathogenicity enhance diagnostic strategies for yersiniosis.

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