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A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Type VI secretion and anti-host effectors.

Abderrahman Hachani1, Thomas E Wood2, Alain Filloux2

  • 1MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, SW72AZ London, United Kingdom; Department of Pathogen Molecular Biology, Faculty of Infection and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, United Kingdom; Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Victoria 3000, Australia.

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The type VI secretion system (T6SS) is a bacterial machine that delivers toxins to harm competing bacteria. It also helps pathogens evade host immunity and infect cells.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Secretion systems are crucial for bacterial virulence, enabling pathogen delivery of effector proteins into host cells.
  • The type VI secretion system (T6SS) is a complex molecular machine found in many Gram-negative bacteria.
  • T6SS functions include interbacterial antagonism and interaction with eukaryotic host cells.

Purpose of the Study:

  • To elucidate the multifaceted roles of the type VI secretion system (T6SS) in bacterial infections.
  • To understand how T6SS contributes to pathogen colonization and persistence within host environments.
  • To investigate T6SS effectors involved in subverting eukaryotic cell functions and immune evasion.

Main Methods:

  • Analysis of T6SS structure and function in pathogenic bacteria.
  • Investigating the delivery of T6SS toxins and effectors into target cells.
  • Studying the impact of T6SS on host-pathogen interactions and immune responses.

Main Results:

  • T6SS mediates direct killing of competing bacteria, providing a competitive advantage to pathogens.
  • T6SS effectors are also employed to manipulate eukaryotic host cells, aiding infection.
  • These effectors can impede host cell functions and promote immune evasion, facilitating pathogen survival.

Conclusions:

  • The T6SS is a versatile virulence factor with dual roles in bacterial antagonism and host cell subversion.
  • T6SS contributes significantly to pathogen colonization, persistence, and immune evasion during infection.
  • Targeting T6SS represents a potential strategy for developing novel anti-infective therapies.