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• W2079883775 endingPage "e1004136" @default.
• W2079883775 startingPage "e1004136" @default.
• W2079883775 abstract "The protein kinase Mec1 (ATR ortholog) and its partner Ddc2 (ATRIP ortholog) play a key role in DNA damage checkpoint responses in budding yeast. Previous studies have established the model in which Ddc1, a subunit of the checkpoint clamp, and Dpb11, related to TopBP1, activate Mec1 directly and control DNA damage checkpoint responses at G1 and G2/M. In this study, we show that Ddc2 contributes to Mec1 activation through a Ddc1- or Dpb11-independent mechanism. The catalytic activity of Mec1 increases after DNA damage in a Ddc2-dependent manner. In contrast, Mec1 activation occurs even in the absence of Ddc1 and Dpb11 function at G2/M. Ddc2 recruits Mec1 to sites of DNA damage. To dissect the role of Ddc2 in Mec1 activation, we isolated and characterized a separation-of-function mutation in DDC2, called ddc2-S4. The ddc2-S4 mutation does not affect Mec1 recruitment but diminishes Mec1 activation. Mec1 phosphorylates histone H2A in response to DNA damage. The ddc2-S4 mutation decreases phosphorylation of histone H2A more significantly than the absence of Ddc1 and Dpb11 function does. Our results suggest that Ddc2 plays a critical role in Mec1 activation as well as Mec1 localization at sites of DNA damage." @default.
• W2079883775 created "2016-06-24" @default.
• W2079883775 creator A5033422116 @default.
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• W2079883775 date "2014-02-20" @default.
• W2079883775 modified "2023-10-14" @default.
• W2079883775 title "Ddc2 Mediates Mec1 Activation through a Ddc1- or Dpb11-Independent Mechanism" @default.
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• W2079883775 doi "https://doi.org/10.1371/journal.pgen.1004136" @default.
• W2079883775 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3930518" @default.
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• W2079883775 hasPublicationYear "2014" @default.
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