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The Tip Complex: From Host Cell Sensing to Translocon Formation.

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Type III secretion systems inject bacterial effectors into host cells. This review details injectisome tip complex structure and translocon pore formation in Yersinia, Shigella, and Salmonella.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Type III secretion systems (T3SS) are essential virulence factors in many Gram-negative bacteria.
  • The injectisome nanomachine facilitates direct delivery of bacterial effector proteins into host cells.
  • Regulation of T3SS is crucial for bacterial survival and host manipulation.

Purpose of the Study:

  • To review the structure and formation of the type III secretion injectisome tip complex.
  • To discuss the transition from nascent tip complex to assembled translocon pore.
  • To compare T3SS in Yersinia, Shigella, and Salmonella, focusing on secretion regulation.

Main Methods:

  • Literature review of existing research on T3SS structure and function.
  • Comparative analysis of injectisome components and regulatory mechanisms.
  • Focus on structural and mechanistic insights into tip complex and translocon formation.

Main Results:

  • The injectisome comprises basal body, needle, sorting platform, and tip complex.
  • Host cell contact triggers translocon pore formation for effector translocation.
  • Secretion control is mediated by the cytoplasmic sorting platform and the needle tip complex.

Conclusions:

  • The needle tip complex plays a critical role in sensing environmental signals and initiating secretion.
  • In Shigella, both the tip complex and the first secreted translocon regulate secretion.
  • Understanding injectisome tip complex assembly and translocon formation is key to T3SS function.