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Related Concept Videos

S-Cdk Initiates DNA Replication02:38

S-Cdk Initiates DNA Replication

The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
S-Cdk Initiates DNA Replication02:38

S-Cdk Initiates DNA Replication

The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Eukaryotic DNA replication control: lock and load, then fire.

Dirk Remus1, John F X Diffley

  • 1Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms, UK.

Current Opinion in Cell Biology
|September 22, 2009
PubMed
Summary
This summary is machine-generated.

DNA replication initiation involves loading inactive hexameric DNA helicases in eukaryotes, unlike bacteria. This regulated

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication initiation requires initiator proteins to load hexameric DNA helicases at replication origins.
  • Helicase loading is a tightly regulated process in both bacteria and eukaryotes.
  • Eukaryotic helicase loading differs from bacteria as it is loaded in an inactive form, introducing a 'lock and load' mechanism.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of DNA replication initiation.
  • To compare and contrast helicase loading and activation processes in eukaryotes and bacteria.
  • To understand the implications of differential helicase regulation for DNA replication control.

Main Methods:

  • Comparative analysis of initiator proteins and helicases across different domains of life.
  • Review of existing literature on DNA replication initiation and regulation.
  • Structural homology studies of initiator proteins.

Main Results:

  • Eukaryotic DNA helicases are loaded in an inactive state, requiring a subsequent activation step.
  • This temporal separation of loading and activation allows for precise regulation of DNA replication.
  • Initiator proteins are structurally homologous, but replicative helicases are evolutionarily distinct between bacteria and eukaryotes.

Conclusions:

  • The eukaryotic 'lock and load' mechanism for helicase activation provides enhanced control over DNA replication.
  • Understanding these differences is key to comprehending DNA replication regulation across all life forms.
  • This regulatory strategy is vital for coordinating replication with cell growth, preventing re-replication, and managing replication stress.