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Bacteroidetes Gliding Motility and the Type IX Secretion System.

Mark J McBride1

  • 1Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53201.

Microbiology Spectrum
|February 16, 2019
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Summary

Bacteroidetes bacteria use a unique Type IX secretion system (T9SS) for gliding motility and secreting proteins. This system is essential for cell surface adhesion and movement, with intertwined components powering both functions.

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Area of Science:

  • Microbiology
  • Bacterial Physiology

Background:

  • The phylum Bacteroidetes possesses unique characteristics like gliding motility and the Type IX protein secretion system (T9SS).
  • These features are largely exclusive to this phylum and play crucial roles in bacterial cell surface functions.

Purpose of the Study:

  • To investigate the relationship between gliding motility and the Type IX protein secretion system (T9SS) in Bacteroidetes.
  • To understand the secretion mechanism of cell surface proteins and motility components via T9SS.

Main Methods:

  • Analysis of T9SS components and their relation to gliding motility machinery.
  • Investigating the protein transport pathway across the bacterial cell envelope.

Main Results:

  • T9SS components are novel and distinct from other bacterial secretion systems.
  • Proteins secreted via T9SS utilize the Sec system for inner membrane transport and T9SS for outer membrane translocation.
  • Conserved C-terminal domains in secreted proteins target them to the T9SS for secretion.

Conclusions:

  • Gliding motility and T9SS are interconnected in Bacteroidetes.
  • T9SS is critical for secreting motility adhesins like SprB, essential for cell surface movement.
  • Shared components may energize both T9SS-mediated protein secretion and gliding motility.