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Fragment and Conquer

Vera Kozjak-Pavlovic1, Suvagata Roy Chowdhury1, Thomas Rudel1

  • 1Department of Microbiology, Biocenter, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany.

Cell Host & Microbe
|September 15, 2017
PubMed

Insights

Legionella pneumophila bacteria interact with host mitochondria, altering cell metabolism. This study reveals how the type IV secretion system (T4SS) effector MitF manipulates mitochondria to benefit bacterial replication.

Area of Science:

  • Microbiology
  • Cell Biology
  • Infectious Diseases

Background:

  • Legionella pneumophila establishes intracellular replication within a specialized vacuole.
  • Host cell mitochondria are known to interact with the Legionella replication vacuole.

Purpose of the Study:

  • To investigate the mechanisms by which Legionella pneumophila interacts with host mitochondria.
  • To determine the role of the T4SS effector MitF in modulating mitochondrial function.
  • To understand how bacterial infection reprograms host cell metabolism for pathogen benefit.

Main Methods:

  • Microscopy to visualize host-pathogen interactions.
  • Genetic manipulation of Legionella pneumophila and its effectors.
  • Mitochondrial function assays.
  • Metabolomic analysis of infected host cells.

Main Results:

  • The Legionella replication vacuole directly contacts host mitochondria.
  • The T4SS effector MitF directly impacts mitochondrial respiration and membrane potential.
  • Infected cells exhibit metabolic reprogramming favoring bacterial growth.

Conclusions:

  • Legionella pneumophila actively manipulates host mitochondria via effector proteins like MitF.
  • Mitochondrial dysfunction and metabolic reprogramming are crucial for L. pneumophila pathogenesis.
  • Targeting host-pathogen mitochondrial interactions could offer novel therapeutic strategies.

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