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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...
Binary Fission01:26

Binary Fission

Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
Binary Fission01:20

Binary Fission

Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Prokaryotic Cells01:28

Prokaryotic Cells

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.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.
Prokaryotic Cells01:51

Prokaryotic Cells

Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.

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Nucleoid occlusion and bacterial cell division.

Ling Juan Wu1, Jeff Errington

  • 1Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle-upon-Tyne, NE2 4AX, UK.

Nature Reviews. Microbiology
|October 25, 2011
PubMed
Summary
This summary is machine-generated.

Bacterial cell division relies on precise septum formation, guided by nucleoid occlusion. This mechanism prevents the Z-ring from forming near the DNA, ensuring proper cell division and genome integrity.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Molecular Biology

Background:

  • Bacterial cell division requires precise coordination of cellular processes, including septum formation.
  • Septum formation must occur at the correct time and location to ensure daughter cell equality and genome integrity.

Purpose of the Study:

  • To explain the role of nucleoid occlusion in bacterial cell division.
  • To elucidate how nucleoid occlusion prevents septum formation near the nucleoid.

Main Methods:

  • The study focuses on the regulatory mechanisms of bacterial cytokinesis.
  • It examines the interplay between the nucleoid and the cell division machinery.

Main Results:

  • Nucleoid occlusion acts as a crucial defense mechanism in bacteria.
  • It prevents the division septum from bisecting or damaging the bacterial chromosome.
  • This process inhibits Z-ring formation in proximity to the nucleoid, thereby dictating septation site.

Conclusions:

  • Nucleoid occlusion is essential for maintaining genome integrity during bacterial cell division.
  • It plays a key role in spatial regulation of the bacterial cell cycle and septation.
  • Understanding nucleoid occlusion provides insights into fundamental bacterial cell biology.