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Protein phosphatase 1 recruitment by Rif1 regulates DNA replication origin firing by counteracting DDK activity

Anoushka Davé1, Carol Cooley1, Mansi Garg1

  • 1Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton BN1 9RQ, UK.

Cell Reports
|March 25, 2014
PubMed

Insights

Rif1 protein, through interaction with PP1 phosphatases, regulates DNA replication timing by counteracting DDK kinase activity. This interaction, modulated by phosphorylation, is crucial for controlling origin firing and maintaining genomic stability.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA replication origin firing is regulated by CDK and DDK kinases.
  • Rif1 protein is involved in specifying replication timing in eukaryotes.
  • The precise mechanism of Rif1's role in replication timing is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which Rif1 specifies DNA replication timing.
  • To investigate the interaction between Rif1 and PP1 phosphatases in regulating origin firing.
  • To understand how Rif1/PP1 activity is controlled.

Main Methods:

  • Genetic analysis of Rif1 mutations in yeast models (budding and fission).
  • Biochemical assays to study Rif1-PP1 interactions.
  • Investigating the interplay between Rif1/PP1 and DDK kinase activity.

Main Results:

  • Rif1's function in replication timing depends on its interaction with PP1 phosphatases.
  • Mutations in Rif1's PP1 docking motifs cause aberrant telomere replication and origin firing.
  • Rif1/PP1 complex antagonizes DDK activity on the MCM helicase.
  • Rif1 phosphorylation, likely by CDK/DDK, downregulates the Rif1/PP1 interaction.

Conclusions:

  • Rif1, via PP1 phosphatases, acts as a key regulator of DNA replication timing.
  • PP1 phosphatases play a critical role in controlling origin firing.
  • Phosphorylation-dependent regulation of Rif1/PP1 interaction fine-tunes replication timing.

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