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Type III Secretion in Chlamydia.

Elizabeth A Rucks1

  • 1Department of Pathology and Microbiology, University of Nebraska Medical Center, Durham Research Center II, Omaha, Nebraska, USA.

Microbiology and Molecular Biology Reviews : MMBR
|June 26, 2023
PubMed
Summary
This summary is machine-generated.

Type III secretion systems (T3SSs) are crucial for Chlamydiaceae pathogenesis, delivering effectors to manipulate host cells. This review details T3SS discovery, function, and effectors throughout the chlamydial developmental cycle.

Keywords:
chlamydiatype III secretion

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Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogenesis

Background:

  • Type III secretion systems (T3SSs) are essential virulence factors in Gram-negative pathogens, enabling direct injection of effector proteins into host cells.
  • Chlamydiaceae, obligate intracellular bacteria, possess a highly conserved T3SS critical for their survival and propagation, with a significant portion of their genome dedicated to T3SS components.
  • Chlamydiae exhibit a biphasic developmental cycle (infectious elementary bodies and replicative reticulate bodies), with T3SS structures and effectors active at various stages.

Purpose of the Study:

  • To review the historical discovery and biochemical characterization of the chlamydial T3SS apparatus and its associated chaperones.
  • To elucidate the functional role of the T3SS throughout the chlamydial developmental cycle.
  • To discuss recent advances in understanding chlamydial effectors and the use of surrogate models for T3SS research.

Main Methods:

  • Review of existing literature on T3SS discovery and characterization in Chlamydiaceae.
  • Biochemical analysis of T3SS apparatus components and chaperones.
  • Functional analysis of T3SS effectors at different stages of the chlamydial developmental cycle.
  • Utilizing heterologous/surrogate models to study chlamydial T3SS.

Main Results:

  • The chlamydial T3SS is a conserved, essential system for pathogenesis, operating throughout the organism's biphasic life cycle.
  • Biochemical characterization has identified key components of the T3SS apparatus and chaperones, despite limitations in genetic tools.
  • Effector proteins delivered by the T3SS play roles in chlamydial entry, intracellular survival, and egress.

Conclusions:

  • The chlamydial T3SS is a central virulence determinant, integral to the unique biology and pathogenesis of Chlamydiaceae.
  • Understanding the T3SS and its effectors provides insights into host-pathogen interactions and potential therapeutic targets.
  • Heterologous systems are valuable tools for dissecting the complex mechanisms of the chlamydial T3SS.