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- W1986011169 abstract "The DNA replication-licensing factor Cdt1 is present during the G1 phase of the cell cycle. When cells initiate S phase or are UV-irradiated, Cdt1 is recruited to chromatin-bound PCNA and ubiquitinated by CRL4Cdt2 for degradation. In both situations, the substrate-recognizing subunit Cdt2 is detected as a highly phosphorylated form. Here, we show that both caffeine-sensitive kinase and MAP kinases are responsible for Cdt2 phosphorylation following UV irradiation. We found that Cdt1 degradation was attenuated in the presence of caffeine. This attenuation was also observed in cells depleted of ATR, but not ATM. Following UV irradiation, Cdt2 was phosphorylated at the S/TQ sites. ATR phosphorylated Cdt2 in vitro, mostly in the C-terminal region. Cdt1 degradation was also induced by DNA damaging chemicals such as methyl methanesulfonate (MMS) or zeocin, depending on PCNA and CRL4-Cdt2, though it was less caffeine-sensitive. These findings suggest that ATR, activated after DNA damage, phosphorylates Cdt2 and promotes the rapid degradation of Cdt1 after UV irradiation in the G1 phase of the cell cycle." @default.
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- W1986011169 date "2012-09-28" @default.
- W1986011169 modified "2023-09-26" @default.
- W1986011169 title "Checkpoint Kinase ATR Phosphorylates Cdt2, a Substrate Receptor of CRL4 Ubiquitin Ligase, and Promotes the Degradation of Cdt1 following UV Irradiation" @default.
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- W1986011169 doi "https://doi.org/10.1371/journal.pone.0046480" @default.
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