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Type III secreted effectors that target mitochondria.

Ipsita Nandi1, Lior Aroeti2, Rachana Pattani Ramachandran1

  • 1Department of Cell and Developmental Biology, The Alexander Silberman Institute of Life Sciences, Safra Campus Givat Ram, The Hebrew University of Jerusalem, Jerusalem, Israel.

Cellular Microbiology
|May 7, 2021
PubMed
Summary

Pathogenic bacteria use type III secretion systems (T3SS) to inject effector proteins into host cells, targeting mitochondria to control cell death and immunity. However, few T3SS effectors targeting mitochondria are characterized, and their mechanisms remain unclear.

Keywords:
A/E pathogensShigellabacterial colonisationbacterial detachment and spreadinnate immunitymitochondria-induced cell deathsalmonellatype III secreted effector proteins

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Area of Science:

  • Microbiology
  • Cell Biology
  • Molecular Biology

Background:

  • Gram-negative bacterial pathogens utilize type III secretion systems (T3SS) to deliver effector proteins into host cells.
  • These effectors manipulate host cell functions, including mitochondrial activity, impacting virulence.
  • Mitochondria are crucial for cellular processes like apoptosis and innate immunity, making them key targets for bacterial manipulation.

Purpose of the Study:

  • To review the current understanding of type III secreted effectors that target host mitochondria.
  • To identify knowledge gaps and propose hypotheses regarding the mechanisms of mitochondrial effector activity.
  • To explore how these effectors influence host and bacterial cell fate.

Main Methods:

  • Literature review and synthesis of existing research on T3SS effectors and mitochondrial targeting.
  • Comparative analysis of effectors from pathogens like *Salmonella*, *Shigella*, and A/E bacteria.
  • Hypothesis generation based on current data and known mitochondrial functions.

Main Results:

  • Only a limited number of T3SS effectors targeting mitochondria have been identified and characterized.
  • The precise mechanisms by which these effectors modulate mitochondrial functions are not well understood.
  • Pathogenic bacteria leverage mitochondrial pathways to subvert host defenses and promote infection.

Conclusions:

  • There is a significant need for further research into the mechanisms of T3SS effectors targeting mitochondria.
  • Understanding these interactions is crucial for developing novel therapeutic strategies against bacterial pathogens.
  • Targeting mitochondrial pathways represents a key virulence strategy for many bacterial pathogens.