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Related Concept Videos

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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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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
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The Replisome03:01

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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The sub-cellular localization of Sulfolobus DNA replication.

Tamzin Gristwood1, Iain G Duggin, Michaela Wagner

  • 1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, OX1 3RE, UK.

Nucleic Acids Research
|March 10, 2012
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Summary

Researchers studied DNA replication in hyperthermophilic archaea using novel strains. They found that replication machinery (replisomes) is located at the cell periphery, with origins spatially separated.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • DNA replication proteins in hyperthermophilic archaea are well-studied for structure and function.
  • Regulation and progression of DNA replication within archaeal cells remain poorly understood.

Purpose of the Study:

  • To investigate the sub-cellular localization of nascent DNA and replisomes in Sulfolobus species.
  • To understand the spatial organization of DNA replication origins and forks in archaeal chromosomes.

Main Methods:

  • Generation of Sulfolobus solfataricus and Sulfolobus acidocaldarius strains capable of incorporating nucleoside analogues during DNA replication.
  • Immunolocalization analyses of replisomes in conjunction with nucleoside analogue incorporation.
  • Investigating the localization of nascent DNA and replisomes within the cell.

Main Results:

  • Replisomes exhibit a peripheral localization within the Sulfolobus cell.
  • The three replication origins on the Sulfolobus chromosome are spatially separated.
  • Replication forks originating from a single origin remain in close proximity.

Conclusions:

  • The study provides new insights into the spatial organization and regulation of DNA replication in hyperthermophilic archaea.
  • Peripheral replisome localization may be a conserved feature in archaeal DNA replication.