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Related Concept Videos

Nucleoid01:24

Nucleoid

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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Cytoskeletal Proteins in Bacteria

Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
Prokaryotic Cells01:28

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Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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Prokaryotic Cells01:51

Prokaryotic Cells

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Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
Binary Fission01:26

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Related Experiment Video

Updated: May 17, 2026

Super-resolution Imaging of the Bacterial Division Machinery
08:47

Super-resolution Imaging of the Bacterial Division Machinery

Published on: January 21, 2013

Let's get 'Fisical' with bacterial nucleoid.

Ludovic Le Chat1, Olivier Espéli

  • 1Centre de Génétique Moléculaire, CGM, CNRS, UPR3404, Université Paris, Sud. 1 Avenue de la terrasse, 91198 Gif sur Yvette, France.

Molecular Microbiology
|October 20, 2012
PubMed
Summary

Bacterial chromosome segregation mechanisms are unclear. New research using live Escherichia coli cells suggests nucleoids act as self-adherent polymers, challenging the entropic segregation model.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Polymer Physics

Background:

  • Bacterial chromosome segregation mechanisms are not fully understood.
  • Existing factors lack essential roles compared to eukaryotic systems.
  • A recent model proposed entropic forces in the nucleoid drive segregation.

Purpose of the Study:

  • To experimentally challenge the entropic model of bacterial chromosome segregation.
  • To analyze nucleoid choreography in live Escherichia coli cells.

Main Methods:

  • Utilized a Fis-green fluorescent protein (GFP) fusion in live Escherichia coli.
  • Tracked nucleoid dynamics and analyzed them using polymer physics principles.

Main Results:

  • Escherichia coli nucleoids exhibit behavior consistent with self-adherent polymers.
  • Observed specific segregation patterns that do not support an entropic segregation model.

Conclusions:

  • The findings challenge the sufficiency of entropic forces for bacterial chromosome segregation.
  • Suggests a need to revisit earlier models of bacterial chromosome organization and segregation.