Deregulated Ras signaling compromises DNA damage checkpoint recovery inS. cerevisiae
Deregulated Ras signaling compromises DNA damage checkpoint recovery inS. cerevisiae
The DNA damage checkpoint maintains genome stability by arresting the cell cycle and promoting DNA repair under genotoxic stress. Cells must downregulate the checkpoint signaling pathways in order to resume cell division after completing DNA repair. While the mechanisms of checkpoint activation have been well-characterized, the process of checkpoint recovery, and the signals regulating it, has only recently been investigated. We have identified a new role for the Ras signaling pathway as a regulator of DNA damage checkpoint recovery. Here we report that in budding yeast, deletion of the IRA1 and IRA2 genes encoding negative regulators of Ras prevents cellular recovery from a DNA damage induced arrest. The checkpoint kinase Rad53 is dephosphorylated in an IRA-deficient strain, indicating that recovery failure is not caused by constitutive checkpoint pathway activation. The ira1Δ ira2Δ recovery defect requires the checkpoint kinase Chk1 and the cAMP-dependent protein kinase (PKA) catalytic subunit Tpk2. Furthermore, PKA phosphorylation sites on the anaphase promoting complex specificity factor Cdc20 are required for the recovery defect, indicating a link between the recovery defect and PKA regulation of mitosis. This work identifies a new signaling pathway that can regulate DNA damage checkpoint recovery and implicates the Ras signaling pathway as an important regulator of mitotic events.
- Dartmouth College United States
Saccharomyces cerevisiae Proteins, DNA Repair, Cdc20 Proteins, GTPase-Activating Proteins, Mitosis, Cell Cycle Proteins, Saccharomyces cerevisiae, Protein Serine-Threonine Kinases, Cyclic AMP-Dependent Protein Kinases, Checkpoint Kinase 2, Catalytic Domain, Checkpoint Kinase 1, ras Proteins, Phosphorylation, Protein Kinases, DNA Damage, Signal Transduction
Saccharomyces cerevisiae Proteins, DNA Repair, Cdc20 Proteins, GTPase-Activating Proteins, Mitosis, Cell Cycle Proteins, Saccharomyces cerevisiae, Protein Serine-Threonine Kinases, Cyclic AMP-Dependent Protein Kinases, Checkpoint Kinase 2, Catalytic Domain, Checkpoint Kinase 1, ras Proteins, Phosphorylation, Protein Kinases, DNA Damage, Signal Transduction
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