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- W2058077102 abstract "The Dbf4/Drf1-dependent S-phase-promoting kinase Cdc7 (Ddk) is thought to be an essential target inactivated by the S-phase checkpoint machinery that inhibits DNA replication. However, we show here that the complex formation, chromatin association, and kinase activity of Ddk are not inhibited during the DNA-damage-induced S-phase checkpoint response in Xenopus egg extracts and mammalian cells. Instead, we find that Ddk plays an active role in regulating S-phase checkpoint signaling. Addition of purified Ddk to Xenopus egg extracts or overexpression of Dbf4 in HeLa cells downregulates ATR-Chk1 checkpoint signaling and overrides the inhibition of DNA replication and cell-cycle progression induced by DNA-damaging agents. These results indicate that Ddk functions as an upstream regulator to monitor S-phase checkpoint signaling. We propose that Ddk modulates the S-phase checkpoint control by attenuating checkpoint signaling and triggering DNA replication reinitiation during the S-phase checkpoint recovery." @default.
- W2058077102 created "2016-06-24" @default.
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- W2058077102 date "2008-12-01" @default.
- W2058077102 modified "2023-10-13" @default.
- W2058077102 title "The Role of Dbf4/Drf1-Dependent Kinase Cdc7 in DNA-Damage Checkpoint Control" @default.
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- W2058077102 doi "https://doi.org/10.1016/j.molcel.2008.12.005" @default.
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