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A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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A view to a kill: the bacterial type VI secretion system.

Brian T Ho1, Tao G Dong1, John J Mekalanos1

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.

Cell Host & Microbe
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The bacterial type VI secretion system (T6SS) propels effectors into prey cells using a contractile mechanism. This system is crucial for bacterial survival, infection, and disease, with ongoing research into its structure and regulation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Cell Biology

Background:

  • The bacterial type VI secretion system (T6SS) is a complex organelle.
  • It shares structural and mechanistic similarities with contractile phage tails.
  • The T6SS delivers effector proteins into target cells.

Purpose of the Study:

  • To review recent advances in understanding the T6SS.
  • To highlight the T6SS's structure, function, assembly, and regulation.
  • To emphasize the T6SS's role in bacterial pathogenesis and survival.

Main Methods:

  • Literature review of recent studies on T6SS.
  • Analysis of structural and mechanistic data.
  • Examination of regulatory mechanisms.

Main Results:

  • T6SS utilizes a rapid conformational change for effector delivery.
  • The organelle undergoes ATP-dependent recycling after contraction.
  • T6SS regulation involves transcriptional and posttranslational control.
  • T6SS targets both eukaryotic cells and competing bacteria.

Conclusions:

  • The T6SS is a dynamic machine essential for bacterial interactions.
  • Its function is critical in both environmental settings and host infections.
  • Further research continues to elucidate T6SS complexity and roles.