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Related Concept Videos

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.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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The DNA Replication Fork01:02

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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...
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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,...
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Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
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The DNA Replication Machine: Structure and Dynamic Function.

Nina Y Yao1, Michael E O'Donnell2,3

  • 1DNA Replication Laboratory, The Rockefeller University, New York, USA, 10065.

Sub-Cellular Biochemistry
|November 30, 2020
PubMed
Summary
This summary is machine-generated.

DNA replication requires five core replisome factors in all cells. Surprisingly, three factors lack common ancestry between bacteria and eukaryotes, revealing distinct DNA duplication strategies.

Keywords:
Clamp loaderDNA polymeraseHelicasePrimaseReplisomeSliding clamp

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Accurate DNA genome duplication is essential for all cell types.
  • This process relies on a conserved multi-protein machinery known as the replisome.
  • Five core replisome factors are fundamental across all studied cellular life forms.

Purpose of the Study:

  • To outline the major proteins involved in DNA duplication at replication forks.
  • To highlight the differences and similarities in DNA replication strategies between eukaryotes and bacteria.

Main Methods:

  • Comparative genomics analysis to trace evolutionary ancestry of replisome factors.
  • Biochemical and structural studies of replication fork machinery in diverse organisms.
  • Literature review of existing research on DNA replication mechanisms.

Main Results:

  • Identified five essential core replisome factors conserved across life.
  • Discovered that three of these five factors lack detectable common ancestry between bacteria and eukaryotes.
  • Revealed significant distinctions in the organization and function of bacterial and eukaryotic replisomes.

Conclusions:

  • Despite functional conservation, the evolutionary origins of key replisome components differ significantly between bacteria and eukaryotes.
  • Bacterial and eukaryotic DNA replication machinery exhibit distinct strategies in their assembly and operation.
  • Understanding these differences provides insights into the evolution of fundamental cellular processes.