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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Updated: Jan 4, 2026

Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
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Nucleoid-mediated positioning and transport in bacteria.

Jessica R Kisner1, Nathan J Kuwada2

  • 1Department of Physics, Central Washington University, Ellensburg, WA, 98926, USA.

Current Genetics
|November 7, 2019
PubMed
Summary

The bacterial nucleoid, a dynamic structure, actively positions and transports cellular components. This review highlights its role in essential bacterial cell processes like replication and segregation.

Keywords:
Active partitioningChromosome dynamicsChromosome segregationPlasmid partitioning

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Area of Science:

  • Bacterial Cell Biology
  • Molecular Biology
  • Microbiology

Background:

  • The precise spatiotemporal positioning of subcellular components is vital for bacterial cell function.
  • The bacterial nucleoid, though dense, is a dynamic structure crucial for processes like gene expression, replication, and segregation.

Purpose of the Study:

  • To review recent findings on nucleoid-mediated positioning and transport in Escherichia coli.
  • To propose a model where the dynamic nucleoid structure drives cellular positioning and transport.

Main Methods:

  • Literature review of recent reports on nucleoid function in Escherichia coli.
  • Analysis of studies investigating macromolecular mobility within the bacterial nucleoid.

Main Results:

  • The bacterial nucleoid plays an integral role in the dynamic localization of various cellular components.
  • Macromolecular mobility within the nucleoid is surprisingly high despite its dense nature.

Conclusions:

  • The dynamic, cellular-scale structure of the nucleoid is a key driver for positioning and transport within bacterial cells.
  • A global, default positioning and transport system mediated by the nucleoid may explain bacterial partitioning and segregation mechanisms.