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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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Distinct RPA functions promote eukaryotic DNA replication initiation and elongation.

Alexandra M Pike1, Caitlin M Friend2, Stephen P Bell1

  • 1Howard Hughes Medical Institute, Massachusetts Institute of Technology, Department of Biology, Cambridge, MA 02139, USA.

Nucleic Acids Research
|September 22, 2023
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Summary
This summary is machine-generated.

Replication protein A (RPA) is crucial for DNA replication and repair. Specific DNA-binding properties, not interaction domains, are key for origin unwinding, while RPA domains uniquely regulate replication fork functions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Replication protein A (RPA) is essential for eukaryotic DNA replication, DNA damage response, and repair.
  • RPA binds single-stranded DNA (ssDNA) and plays a role in origin unwinding and DNA synthesis.

Purpose of the Study:

  • To investigate the functional requirements of RPA during DNA replication.
  • To determine if ssDNA-binding proteins (SSBs) from other organisms can substitute for RPA.
  • To elucidate the specific roles of RPA domains in origin unwinding and replication fork progression.

Main Methods:

  • Reconstituted Saccharomyces cerevisiae origin unwinding and DNA replication assays.
  • Testing of various ssDNA-binding proteins, including Escherichia coli SSB and T4 bacteriophage Gp32.
  • Analysis of RPA mutants to assess the importance of ssDNA-binding and protein-interaction domains.

Main Results:

  • Escherichia coli SSB, but not T4 Gp32, fully substituted for RPA in origin unwinding.
  • Specific ssDNA-binding properties of RPA are essential for origin unwinding, while protein-interaction domains are dispensable for this process.
  • The Rfa1 OB-F domain negatively regulates lagging-strand synthesis, and the Rfa2 winged-helix domain stimulates nascent strand initiation.

Conclusions:

  • Specific ssDNA-binding modes are required for the transition to extensive origin DNA unwinding.
  • Distinct RPA domains have specialized functions at the eukaryotic replication fork, impacting both initiation and elongation.
  • Understanding RPA's multifaceted roles provides insights into DNA replication and repair mechanisms.