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Related Concept Videos

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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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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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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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Mechanism of single-stranded DNA annealing by RAD52-RPA complex.

Chih-Chao Liang1, Luke A Greenhough2, Laura Masino2

  • 1The Francis Crick Institute, London, UK. eric.liang@crick.ac.uk.

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|April 24, 2024
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RAD52 protein is crucial for DNA repair and cancer. This study reveals its structure and mechanism for repairing DNA by annealing single-stranded DNA (ssDNA) with replication protein-A (RPA).

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cancer Research

Background:

  • RAD52 protein is vital for DNA double-strand break repair, DNA synthesis, and telomere maintenance.
  • RAD52 facilitates single-stranded DNA (ssDNA) annealing and offers an alternative to BRCA2/RAD51-dependent homologous recombination repair.
  • RAD52 is a therapeutic target in homologous-recombination-deficient cancers due to synthetic lethality upon its inactivation and association with poor prognosis.

Purpose of the Study:

  • To elucidate the structure of RAD52.
  • To define the molecular mechanism by which RAD52 mediates ssDNA annealing.
  • To understand the role of RAD52 in conjunction with replication protein-A (RPA).

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine the structure of RAD52-ssDNA complexes.
  • Biochemical analyses to investigate the function of RAD52 and RPA in ssDNA annealing.
  • Atomic modeling to visualize ssDNA binding within the RAD52 structure.

Main Results:

  • RAD52 forms undecameric rings, but active ssDNA annealing involves open RAD52 rings interacting with RPA.
  • Atomic models show ssDNA bound within a positively charged channel of the RAD52 ring.
  • The N-terminal domains of RAD52 drive annealing, while C-terminal regions regulate conformation and RPA interaction.

Conclusions:

  • The study defines the molecular mechanism of ssDNA annealing mediated by the RAD52-RPA complex.
  • Structural insights reveal critical interactions between RAD52 and RPA2 during the annealing process.
  • Understanding RAD52's mechanism provides a basis for developing targeted cancer therapies.