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Related Experiment Videos

Rfc4 interacts with Rpa1 and is required for both DNA replication and DNA damage checkpoints in Saccharomyces

H S Kim1, S J Brill

  • 1Department of Molecular Biology and Biochemistry, Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, New Jersey 08854, USA.

Molecular and Cellular Biology
|May 8, 2001
PubMed
Summary

Replication Factor C (RFC) subunit 4 (Rfc4) interacts with Replication Protein A (Rpa1) N-terminal domain (Rpa1N), revealing Rfc4

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Replication protein A (Rpa1) is crucial for DNA replication and repair, with its large subunit (Rpa1) containing DNA-binding domains and an N-terminal domain (Rpa1N) of unknown function.
  • Replication factor C (RFC) is a clamp loader complex essential for DNA replication.

Purpose of the Study:

  • To elucidate the essential function of the Rpa1N domain.
  • To investigate the interaction between Rpa1 and RFC components, specifically RFC4.

Main Methods:

  • Yeast genetics: screening for mutations requiring wild-type Rpa1N for viability.
  • Allele-specific interaction analysis between RFA1 (encoding Rpa1) and RFC4 mutations.
  • Hydroxyurea sensitivity assays to assess DNA replication stress response.

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  • Epistasis analysis with DNA damage checkpoint genes (RAD24).

    • Main Results:

    • A specific mutation in RFC4 (rfc4-2) displayed synthetic lethality with certain Rpa1N mutations (e.g., rfa1-t11).
    • rfc4-2 mutants showed sensitivity to hydroxyurea and defects in DNA replication and intra-S checkpoints.
    • RFC4 was found to be epistatic with RAD24 in DNA damage response, indicating a role in DNA checkpoints.
    • Both rfc4-2 and rfa1-t11 mutants exhibited defects in G(1)/S and G(2)/M DNA damage checkpoints.

    Conclusions:

    • Rfc4 has essential roles beyond DNA replication clamp loading, acting as a sensor in multiple DNA checkpoint pathways.
    • A physical interaction between Rfc4 and Rpa1N is necessary for both DNA replication and checkpoint functions.
    • This interaction highlights a novel regulatory mechanism in DNA damage response and replication.