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Preferential Localization of the Bacterial Nucleoid.

Marc Joyeux1

  • 1Laboratoire Interdisciplinaire de Physique, CNRS and Université Grenoble Alpes, 38400 Grenoble, France. marc.joyeux@univ-grenoble-alpes.fr.

Microorganisms
|July 24, 2019
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Summary

Prokaryotic cells position their genetic material, the nucleoid, centrally. This study suggests nucleoid localization arises from DNA compaction and interactions with cell shape, not specific anchoring mechanisms.

Keywords:
Brownian dynamicsDNAbacteriacoarse-grained modelnucleoidnumerical simulationproteinssegregative phase separation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Prokaryotes lack a nucleus, allowing their genetic material (nucleoid) to occupy cell volume.
  • Despite this, nucleoids are typically found centrally in bacteria.
  • The mechanism driving this precise nucleoid positioning remains unclear.

Purpose of the Study:

  • To investigate whether generic interactions or specific mechanisms govern nucleoid localization in prokaryotes.
  • To explore the role of DNA compaction and cell geometry in nucleoid positioning.

Main Methods:

  • Numerical simulations using a coarse-grained model.
  • Modeling nucleoid formation via phase separation of DNA and macromolecules.
  • Analyzing DNA coil behavior under varying crowder densities.

Main Results:

  • Simulations show DNA coil compaction at high crowder densities.
  • Compacted DNA coils re-localize to regions of high cell curvature, like cell caps.
  • This suggests DNA behaves like a solid sphere upon compaction.

Conclusions:

  • Nucleoid localization may result from generic interactions driven by DNA compaction and cell shape.
  • This challenges the necessity of specific DNA tethering or chemical gradients for positioning.
  • Supports hypotheses involving DNA-membrane interactions or dynamic localization mechanisms.