Replisome stability at defective DNA replication forks is independent of S phase checkpoint kinases

Giacomo De Piccoli, Yuki Katou, Takehiko Itoh, Ryuichiro Nakato, Katsuhiko Shirahige, Karim Labib (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    129 Citations (Scopus)


    The S phase checkpoint pathway preserves genome stability by protecting defective DNA replication forks, but the underlying mechanisms are still understood poorly. Previous work with budding yeast suggested that the checkpoint kinases Mec1 and Rad53 might prevent collapse of the replisome when nucleotide concentrations are limiting, thereby allowing the subsequent resumption of DNA synthesis. Here we describe a direct analysis of replisome stability in budding yeast cells lacking checkpoint kinases, together with a high-resolution view of replisome progression across the genome. Surprisingly, we find that the replisome is stably associated with DNA replication forks following replication stress in the absence of Mec1 or Rad53. A component of the replicative DNA helicase is phosphorylated within the replisome in a Mec1-dependent manner upon replication stress, and our data indicate that checkpoint kinases control replisome function rather than stability, as part of a multifaceted response that allows cells to survive defects in chromosome replication.
    Original languageEnglish
    Pages (from-to)696-704
    Number of pages9
    JournalMolecular Cell
    Issue number5
    Publication statusPublished - 9 Mar 2012


    • Cell Cycle Proteins
    • Phosphorylation
    • Genomic Instability
    • Intracellular Signaling Peptides and Proteins
    • Saccharomyces cerevisiae Proteins
    • Protein-Serine-Threonine Kinases
    • Cell Cycle
    • DNA Replication
    • Stress, Physiological
    • Saccharomyces cerevisiae
    • S Phase Cell Cycle Checkpoints


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