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Z-ring Structure and Constriction Dynamics in E. coli.

Pramod Kumar1,2, Amarjeet Yadav1,2, Itzhak Fishov3

  • 1Department of Physics, Ben-Gurion University of the NegevBeer Sheva, Israel.

Frontiers in Microbiology
|September 30, 2017
PubMed
Summary

Researchers studied bacterial cell division by measuring the Z-ring constriction dynamics in E. coli. They found the Z-ring constricts faster than the cell envelope, causing its width to increase during division.

Keywords:
Z-ringbacterial divisionfluorescence microscopyoptical tweezerssub-pixel measurements

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biophysics

Background:

  • The Z-ring, composed of FtsZ filaments, is crucial for bacterial cell division.
  • The precise mechanism of Z-ring reorganization and constriction during septation is not fully understood.

Purpose of the Study:

  • To quantitatively measure the effective constriction dynamics of the Z-ring in E. coli.
  • To investigate the spatial reorganization of the Z-ring during bacterial septation.

Main Methods:

  • Utilized an oscillating optical trap to manipulate individual E. coli cells between vertical and horizontal orientations.
  • Employed fluorescent imaging in the vertical orientation for Z-ring analysis.
  • Used phase-contrast imaging in the horizontal orientation to measure cell constriction and division time.

Main Results:

  • Observed that the Z-ring constricts at a faster rate than the cell envelope.
  • Found evidence that the radial width of the Z-ring increases during septation.
  • Results contrast with previous studies using photoactivated localization microscopy (PALM).

Conclusions:

  • The Z-ring's constriction dynamics differ from previous observations, potentially due to variations in cell growth rates.
  • Suggests a more complex spatial reorganization of the Z-ring during division than previously modeled.