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Related Experiment Videos

Type III secretion gets an LcrV tip.

Luís Jaime Mota1

  • 1Centre for Molecular Microbiology and Infection, Imperial College London, Flowers Building, Armstrong Road, London, UK, SW7 2AZ. j.mota@imperial.ac.uk

Trends in Microbiology
|March 28, 2006
PubMed
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Type III secretion injects bacterial effector proteins using an injectisome. New evidence clarifies how the secretion pore assembles in host cells and links to the injectisome.

Area of Science:

  • Microbiology
  • Cell Biology
  • Bacterial Pathogenesis

Background:

  • Gram-negative bacteria utilize Type III secretion systems (T3SS) to deliver effector proteins into host cells.
  • T3SS function relies on a needle complex (injectisome) and a translocon pore in the host membrane.
  • The precise mechanisms of pore assembly and its connection to the injectisome remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing the assembly of the T3SS translocation pore.
  • To investigate the physical and functional linkage between the bacterial injectisome and the host cell membrane pore.

Main Methods:

  • Utilizing advanced microscopy techniques to visualize pore formation in real-time.
  • Employing biochemical assays to identify protein interactions between the injectisome and pore components.

Related Experiment Videos

  • Genetic manipulation of bacterial strains to probe the roles of specific T3SS proteins in pore assembly.

    • Main Results:

    • Evidence suggests a stepwise assembly model for the translocation pore.
    • Key protein interactions mediating the connection between the injectisome and the pore have been identified.
    • The injectisome appears to play a crucial role in initiating and stabilizing pore formation.

    Conclusions:

    • The study provides novel insights into the dynamic process of T3SS pore assembly.
    • Understanding these mechanisms is critical for developing novel antibacterial strategies targeting Gram-negative pathogens.
    • The findings highlight the intricate coordination between bacterial secretion machinery and host cell targets.