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Acting on Actin: Rac and Rho Played by Yersinia

Martin Aepfelbacher1, Manuel Wolters2

  • 1Institute of Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246, Hamburg, Germany. m.aepfelbacher@uke.de.

Current Topics in Microbiology and Immunology
|October 17, 2016
PubMed

Insights

Yersinia bacteria, including plague-causing Y. pestis, use virulence factors to manipulate host cell Rho proteins and actin cytoskeleton. This allows them to invade the intestine and evade immune defenses by subverting host regulatory networks.

Area of Science:

  • Microbiology
  • Cell Biology
  • Immunology

Background:

  • Pathogenic Yersinia species, including Yersinia pestis, Yersinia enterocolitica, and Yersinia pseudotuberculosis, are significant human pathogens.
  • These bacteria possess sophisticated virulence factors that target host cell machinery.

Purpose of the Study:

  • To provide an overview of the regulatory network integrating Yersinia virulence factors and host factors.
  • To explain how this network orchestrates the subversion of host defense mechanisms.

Main Methods:

  • Review of existing literature on Yersinia pathogenesis.
  • Analysis of molecular mechanisms involving Rho GTP-binding proteins and the actin cytoskeleton.
  • Examination of bacterial outer membrane proteins and effector proteins.

Main Results:

  • Yersinia utilizes outer membrane proteins to bind integrins, facilitating host cell invasion.
  • Injected effector proteins manipulate Rho protein functions, disrupting host cell signaling.
  • A Rho protein-activating exotoxin contributes to the subversion of host defenses.

Conclusions:

  • Yersinia pathogenesis relies on a complex interplay between bacterial virulence factors and host cellular processes.
  • Understanding this regulatory network is crucial for developing strategies against Yersinia infections.
  • The manipulation of Rho GTP-binding proteins and the actin cytoskeleton is central to Yersinia's ability to overcome host immunity.

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