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Related Experiment Videos

Type III secretion: more systems than you think.

Paul Troisfontaines1, Guy R Cornelis

  • 1Biozentrum der Universität Basel, CH-4056 Basel, Switzerland.

Physiology (Bethesda, Md.)
|September 22, 2005
PubMed
Summary
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Bacteria use the type III secretion (T3S) pathway to inject effector proteins into host cells. This system, found in Gram-negative bacteria, offers valuable tools for cell biology research.

Area of Science:

  • Microbiology
  • Cell Biology
  • Bacterial Pathogenesis

Background:

  • The type III secretion (T3S) pathway is a sophisticated molecular machine utilized by Gram-negative bacteria.
  • This system facilitates the direct injection of bacterial effector proteins into the cytoplasm of host cells, including animal and plant cells.
  • T3S systems have diversified into seven distinct families, disseminated across various bacterial species through horizontal gene transfer.

Purpose of the Study:

  • To provide an overview of the type III secretion system.
  • To highlight the evolutionary distribution and diversity of T3S systems in bacteria.
  • To underscore the potential of T3S effectors as tools in cell biology.

Main Methods:

  • Literature review and synthesis of existing research on T3S systems.

Related Experiment Videos

  • Comparative analysis of T3S system families and their distribution.
  • Exploration of effector protein functions and applications.

    • Main Results:

    • T3S systems are found in diverse Gram-negative bacteria, classified into seven families.
    • A large repertoire of effector proteins, estimated in the hundreds, has been identified.
    • These effectors modulate host cell control and signaling pathways.

    Conclusions:

    • The type III secretion pathway represents a significant virulence factor and a versatile tool for biological research.
    • The diversity of T3S effectors provides a rich resource for understanding host-pathogen interactions and cellular processes.
    • Further investigation into T3S effectors can yield novel applications in cell biology and biotechnology.