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- W2092127860 abstract "The ataxia telangiectasia-mutated and Rad3-related (ATR) kinase functions as a central node in the DNA damage response signaling network. The mechanisms by which ATR activity is amplified and/or maintained are not understood. Here we demonstrate that BRIT1/microcephalin (MCPH1), a human disease-related protein, is dispensable for the initiation but essential for the amplification of ATR signaling. BRIT1 interacts with and recruits topoisomerase-binding protein 1 (TopBP1), a key activator of ATR signaling, to the sites of DNA damage. Notably, replication stress-induced ataxia telangiectasia-mutated or ATR-dependent BRIT1 phosphorylation at Ser-322 facilitates efficient TopBP1 recruitment. These results reveal a mechanism that ensures the continuation of ATR-initiated DNA damage signaling. Our study uncovers a previously unknown regulatory axis of ATR signaling in maintaining genomic integrity, which may provide mechanistic insights into the perturbation of ATR signaling in human diseases such as neurodevelopmental defects and cancer." @default.
- W2092127860 created "2016-06-24" @default.
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- W2092127860 date "2014-12-01" @default.
- W2092127860 modified "2023-10-07" @default.
- W2092127860 title "Phosphorylation of the BRCA1 C Terminus (BRCT) Repeat Inhibitor of hTERT (BRIT1) Protein Coordinates TopBP1 Protein Recruitment and Amplifies Ataxia Telangiectasia-mutated and Rad3-related (ATR) Signaling" @default.
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- W2092127860 doi "https://doi.org/10.1074/jbc.m114.587113" @default.
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