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A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Type 6 secretion dynamics within and between bacterial cells.

M Basler1, J J Mekalanos

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.

Science (New York, N.Y.)
|July 7, 2012
PubMed
Summary
This summary is machine-generated.

The bacterial type VI secretion system (T6SS) uses a contractile sheath for cell attacks. Cytoplasmic ClpV protein rapidly disassembles the T6SS sheath, enabling visualization of bacterial dueling and protein translocation events.

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Area of Science:

  • Microbiology
  • Bacterial cell biology
  • Protein secretion systems

Background:

  • The bacterial type VI secretion system (T6SS) is a protein complex mediating inter-bacterial and bacterial-host cell interactions.
  • T6SS functions as a potent virulence factor, delivering effector proteins via a contractile phage tail-like structure.
  • Understanding T6SS dynamics and regulation is crucial for deciphering bacterial pathogenesis.

Purpose of the Study:

  • To investigate the role of cytoplasmic factors in T6SS sheath dynamics within living bacterial cells.
  • To visualize and characterize the disassembly process of the T6SS sheath.
  • To explore the potential of ClpV as a marker for T6SS activity and bacterial interactions.

Main Methods:

  • Live-cell imaging of bacterial populations.
  • Fluorescence microscopy to track ClpV localization and T6SS sheath dynamics.
  • Characterization of ClpV's interaction with the contracted T6SS sheath structure.

Main Results:

  • The cytoplasmic ATPase ClpV specifically recognizes and rapidly disassembles the contracted T6SS sheath.
  • ClpV imaging provides a spatio-temporal record of T6SS-mediated cell-cell interactions, termed 'T6SS dueling'.
  • These observations suggest repeated T6SS protein translocation events occur during bacterial dueling.

Conclusions:

  • ClpV plays a critical role in T6SS sheath disassembly, regulating the secretion system's lifecycle.
  • ClpV imaging offers a novel method to study T6SS activity and bacterial competition in real-time.
  • This research enhances our understanding of T6SS function in bacterial virulence and inter-bacterial dynamics.