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Related Concept Videos

Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
The DNA Replication Fork01:02

The DNA Replication Fork

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...
The DNA Replication Fork01:02

The DNA Replication Fork

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...
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.

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Hybrid Ensemble and Single-molecule Assay to Image the Motion of Fully Reconstituted CMG
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A key role for the GINS complex at DNA replication forks.

Karim Labib1, Agnieszka Gambus

  • 1Cancer Research U.K., Paterson Institute for Cancer Research, University of Manchester, Manchester, UK. klabib@picr.man.ac.uk <klabib@picr.man.ac.uk>

Trends in Cell Biology
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Summary

The GINS complex, a key part of DNA replication, works with the MCM helicase to initiate and progress DNA replication forks in eukaryotes and archaea.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The GINS complex is a recently discovered component of the DNA replication machinery.
  • It plays a crucial role in both the initiation of DNA replication and the progression of replication forks.
  • GINS is found to associate with the MCM helicase at replication forks.

Purpose of the Study:

  • To review the current literature on the GINS complex and its role in DNA replication.
  • To explore the interaction between the GINS complex and the MCM helicase.
  • To discuss the function of GINS in coupling MCM with other key replication proteins.

Main Methods:

  • Literature review of recent studies on the GINS complex.
  • Analysis of the association between GINS and MCM helicase.
  • Discussion of the functional implications of GINS-MCM interaction.

Main Results:

  • The GINS complex is essential for DNA replication initiation and fork progression.
  • GINS associates with the MCM helicase at replication forks.
  • Archaea possess an analogous GINS complex that interacts with MCM and other replication proteins.

Conclusions:

  • GINS likely serves to couple the MCM helicase with other essential proteins at the replication fork.
  • The GINS complex is a vital and conserved component of the DNA replication machinery across eukaryotes and archaea.
  • Further research is needed to fully elucidate the mechanisms by which GINS facilitates DNA replication.