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How and when are substrates selected for type III secretion?

P Aldridge1, K T Hughes

  • 1Dept of Microbiology, University of Washington, Seattle 98195, USA.

Trends in Microbiology
|May 5, 2001
PubMed
Summary
This summary is machine-generated.

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This study proposes a unifying model for type III secretion in Gram-negative bacteria, integrating mRNA, protein, and chaperone signals. It highlights translation

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Gram-negative bacteria utilize type III secretion systems (T3SS) for virulence and flagellar assembly.
  • Unlike other systems, T3SS substrates lack a single, defined secretion signal.
  • Existing evidence suggests multiple signals, including mRNA, protein N-terminus, and chaperone binding, direct T3SS substrates.

Purpose of the Study:

  • To propose a unifying model for type III secretion.
  • To integrate existing knowledge on secretion signals.
  • To explore the role of translation in T3SS regulation.

Main Methods:

  • Literature review and synthesis of existing data.
  • Development of a conceptual model for T3SS.
  • Analysis of evidence for multiple secretion signals.

Related Experiment Videos

  • Discussion of the role of translation in secretion timing.

    • Main Results:

    • A unifying model for T3SS is presented, applicable to flagellar and virulence factor secretion.
    • The model incorporates three independent secretion signals: 5' mRNA region, amino terminus, and chaperone binding.
    • Evidence suggests that one or more signals may be utilized for a given substrate.
    • The potential role of translation in regulating secretion timing is discussed.

    Conclusions:

    • The proposed model provides a cohesive framework for understanding type III secretion.
    • The model integrates diverse signals, offering a broader perspective on T3SS function.
    • Further investigation into the role of translation could elucidate secretion regulation mechanisms.