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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Force generation by groups of migrating bacteria.

Benedikt Sabass1,2, Matthias D Koch3, Guannan Liu3,4

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, NJ 08544; b.sabass@fz-juelich.de shaevitz@princeton.edu.

Proceedings of the National Academy of Sciences of the United States of America
|June 29, 2017
PubMed
Summary
This summary is machine-generated.

Bacteria collectively move using twitching and gliding motility. This study reveals that both mechanisms generate greater forces in groups than individually, highlighting coordinated force generation in bacterial collective motion.

Keywords:
Myxococcus xanthusbacteriaglidingtraction forcetwitching

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Area of Science:

  • Biophysics
  • Microbiology
  • Cellular Biology

Background:

  • Collective cell migration is crucial for biological processes from bacterial colony formation to embryonic development.
  • While eukaryotic cell migration forces are well-studied, bacterial collective motion force generation remains less understood.

Purpose of the Study:

  • To investigate the biophysical mechanisms of force generation during collective bacterial motility.
  • To compare force generation in two distinct motility mechanisms of *Myxococcus xanthus*: twitching and gliding.

Main Methods:

  • Traction force microscopy was employed to measure cellular forces.
  • Analysis focused on individual cells and groups of *Myxococcus xanthus* exhibiting twitching and gliding.

Main Results:

  • Twitching motility, powered by type-IV pilus retraction, generated local traction hotspots of ~50 pN in individual cells and ~100 pN in groups.
  • Gliding motility, driven by substrate adhesion transport, showed amplified traction (~5-fold) in groups compared to isolated cells.
  • Advancing protrusions in gliding cells primarily push in the direction of motion.

Conclusions:

  • Twitching and gliding forces in *Myxococcus xanthus* exhibit complementary characteristics.
  • Bacterial collective motion amplifies the forces generated by both twitching and gliding mechanisms.