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Related Experiment Videos

The type III secretion injectisome.

Guy R Cornelis1

  • 1Biozentrum der Universität Basel, Klingelbergstrasse 50, CH-4056, Basel, Switzerland. guy.cornelis@unibas.ch.

Nature Reviews. Microbiology
|October 17, 2006
PubMed
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Bacteria use a type III secretion injectisome nanomachine to deliver proteins into host cells. Researchers have detailed its structure and assembly, but the function of many components remains unclear.

Area of Science:

  • Microbiology
  • Structural Biology
  • Molecular Biology

Background:

  • The type III secretion injectisome is a critical bacterial nanomachine for translocating effector proteins into eukaryotic cells.
  • Recent advancements have improved understanding of the injectisome's structure, assembly, and function.

Purpose of the Study:

  • To detail the structural components of the type III secretion injectisome from base to needle tip.
  • To elucidate the assembly process and the atomic-level structures of key proteins involved.

Main Methods:

  • Detailed structural investigations of injectisome components.
  • Atomic-level structure determination of constituent proteins.
  • Analysis of the injectisome assembly pathway.

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Main Results:

  • Principal structural components of the injectisome have been identified and investigated.
  • Atomic structures of several proteins were solved, providing detailed molecular insights.
  • Significant progress has been made in understanding the injectisome's assembly process.

Conclusions:

  • The structure and assembly of the type III secretion injectisome are increasingly understood.
  • Despite progress, the specific roles of numerous injectisome components remain to be elucidated.