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Related Experiment Videos

The medium is the messenger

A D Phillips1

  • 1University Department of Paediatric Gastroenterology, Royal Free Hospital, Pond Street, London NW3 2QG, UK.

Gut
|November 21, 1998
PubMed
Summary
This summary is machine-generated.

Enteropathogenic Escherichia coli uses a novel filamentous organelle containing EspA to bridge bacteria and host cells. This structure is essential for delivering EspB proteins, facilitating pathogen attachment and lesion formation.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Bacterial Pathogenesis

Background:

  • Enteropathogenic Escherichia coli (EPEC) utilizes a type III secretion system (T3SS) to translocate effector proteins into host cells.
  • Key EPEC T3SS effectors include EspA, EspB, EspD, and the translocated intimin receptor (Tir).
  • Tir is crucial for intimate attachment and the formation of "attaching and effacing" (A/E) lesions, but the translocation mechanism remains unclear.

Purpose of the Study:

  • To elucidate the structural basis of protein translocation by the EPEC T3SS.
  • To investigate the role of EspA in the early stages of A/E lesion formation and effector delivery.

Main Methods:

  • Characterization of bacterial surface structures during infection.
  • Microscopy to visualize bacterial-host cell interactions.

Related Experiment Videos

  • Assays to determine the requirement of bacterial components for effector translocation.

    • Main Results:

    • A novel EspA-containing filamentous organelle was identified on the EPEC surface during early infection.
    • This organelle forms a physical bridge connecting the bacterium to the host cell.
    • The EspA-containing organelle is essential for the translocation of EspB into infected epithelial cells.

    Conclusions:

    • The EspA-containing filamentous organelle is a critical component of the EPEC T3SS.
    • This structure mediates the physical connection required for effector protein delivery.
    • Understanding this organelle provides insights into the mechanism of T3SS-mediated translocation.