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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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The Structure and Function of Type III Secretion Systems.

Ryan Q Notti1,2, C Erec Stebbins1

  • 1Laboratory of Structural Microbiology, Rockefeller University, New York, NY 10065.

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|March 22, 2016
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Summary
This summary is machine-generated.

Type III secretion systems (T3SSs) are bacterial nanosyringes that inject effector proteins into host cells. This chapter details T3SS structure and function, exploring recent advances in understanding these crucial bacterial virulence mechanisms.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Bacteriology

Background:

  • Type III secretion systems (T3SSs) are essential virulence factors for many Gram-negative pathogens.
  • These systems enable direct translocation of bacterial effector proteins into host cells, altering host cell functions.
  • The injectisome, a complex nanomachine, forms the conduit for protein delivery across bacterial and host membranes.

Purpose of the Study:

  • To provide a comprehensive overview of T3SS structure and function.
  • To summarize key findings and recent developments in T3SS research.
  • To discuss the structural basis of T3SS secretory apparatus, substrate engagement, and regulation.

Main Methods:

  • Structural analysis of T3SS components.
  • Biophysical characterization of protein translocation.
  • Review of existing literature and recent experimental data.

Main Results:

  • Detailed description of the injectisome structure and its role in host cell manipulation.
  • Elucidation of the mechanism of effector protein secretion and host cell entry.
  • Identification of regulatory mechanisms governing T3SS activity.

Conclusions:

  • T3SSs represent sophisticated molecular machines crucial for bacterial pathogenesis.
  • Understanding T3SS structure-function relationships is key to developing novel therapeutic strategies.
  • Future research will focus on dissecting the dynamic aspects of T3SS-mediated protein delivery.