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Idiosyncratic Biogenesis of Intracellular Pathogens-Containing Vacuoles.

Bethany Vaughn1, Yousef Abu Kwaik1,2

  • 1Department of Microbiology and Immunology, University of Louisville, Louisville, KY, United States.

Frontiers in Cellular and Infection Microbiology
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Summary

Intravacuolar pathogens like Salmonella and Chlamydia evade macrophage defenses by injecting bacterial effectors to remodel vacuoles. These pathogens exhibit unique strategies, despite using similar secretion systems, to create niches for survival and proliferation.

Keywords:
biogenesisintracellular pathogenslysosomestraffickingvacuoles

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Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogenesis

Background:

  • Most bacteria are degraded in macrophages via the endosomal-lysosomal pathway.
  • Intravacuolar pathogens have evolved mechanisms to evade this degradation.
  • Specialized secretion systems (T3SS-T7SS) are crucial for these pathogens.

Purpose of the Study:

  • To review how various intravacuolar pathogens manipulate host cell processes.
  • To highlight the unique effector protein toolboxes employed by different pathogens.
  • To discuss the remodeling of vacuole biogenesis for pathogen proliferation.

Main Methods:

  • Review of scientific literature on intravacuolar pathogens.
  • Analysis of effector protein functions and secretion systems (T3SS-T7SS).
  • Comparison of vacuole biogenesis interference strategies across different bacterial species.

Main Results:

  • Intravacuolar pathogens utilize distinct effector proteins to modulate host cell targets.
  • Pathogens remodel vacuoles into specialized niches for replication.
  • Pathogens interfere with endocytic, exocytic, and ER-to-Golgi vesicle traffic.
  • Coxiella is an exception, proliferating in a lysosomal compartment using T4SS.

Conclusions:

  • Intravacuolar pathogens exhibit unique strategies in vacuole biogenesis interference.
  • Understanding these pathogen-specific mechanisms is key to deciphering host-pathogen interactions.
  • Further research is needed to elucidate the detailed biochemical and cellular processes involved.