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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.
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Replication in Prokaryotes01:32

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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.
Many Proteins Work Together to Replicate the Chromosome
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Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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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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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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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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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Reconstruction of a robust bacterial replication module.

Tao Wang1, Fan He2, Ting He2

  • 1Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences/Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, PR China.

Nucleic Acids Research
|September 13, 2024
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Summary
This summary is machine-generated.

Researchers engineered a bacterial DNA replication module (pRC) by clustering 23 genes. This artificial module enhances DNA synthesis efficiency and stability, offering potential for synthetic genomics.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Genomics

Background:

  • DNA replication is essential for life, requiring complex machinery and regulation.
  • Understanding and manipulating DNA replication is crucial for biological research and biotechnology.

Purpose of the Study:

  • To reconstruct a functional bacterial DNA replication module (pRC) by artificially clustering genes.
  • To investigate the impact of integrating this module into Escherichia coli chromosomes on DNA synthesis efficiency.
  • To assess the potential applications of replication modules in genetic stability and synthetic genome construction.

Main Methods:

  • Artificially clustered 23 DNA replication genes into a module (pRC) in Escherichia coli.
  • Sequentially deleted genes from their natural chromosomal loci.
  • Integrated the pRC module at various chromosomal positions, including near the replication origin.
  • Constructed a minimized module (pRC16) with essential replisome and elongation genes.
  • Integrated the module into extrachromosomal plasmids.

Main Results:

  • Integration of pRC enhanced DNA synthesis efficiency, with efficiency increasing as the module moved closer to the replication origin.
  • Strains with replication modules showed accelerated replication fork movement and earlier initiation of chromosomal replication.
  • The minimized pRC16 module demonstrated DNA replication efficiency comparable to the full pRC module.
  • The replication module ensured robust and rapid DNA replication across different growth conditions.
  • Integrating the module into plasmids improved their genetic stability.

Conclusions:

  • DNA replication can be artificially reconstructed into functional modules.
  • These replication modules enhance chromosomal DNA replication efficiency and genetic stability.
  • The findings suggest potential applications in DNA replication engineering and synthetic modular genome construction.