Reference - Detail
|Author||Adamowicz M, Vermezovic J, d'Adda di Fagagna F.|
|Title||NOTCH1 Inhibits Activation of ATM by Impairing the Formation of an ATM-FOXO3a-KAT5/Tip60 Complex.|
The DNA damage response (DDR) signal transduction pathway is responsible for sensing DNA damage and further relaying this signal into the cell. ATM is an apical DDR kinase that orchestrates the activation and the recruitment of downstream DDR factors to induce cell-cycle arrest and repair. We have previously shown that NOTCH1 inhibits ATM activation upon DNA damage, but the underlying mechanism remains unclear. Here, we show that NOTCH1 does not impair ATM recruitment to DNA double-strand breaks (DSBs). Rather, NOTCH1 prevents binding of FOXO3a and KAT5/Tip60 to ATM through a mechanism in which NOTCH1 competes with FOXO3a for ATM binding. Lack of FOXO3a binding to ATM leads to the loss of KAT5/Tip60 association with ATM. Moreover, expression of NOTCH1 or depletion of ATM impairs the formation of the FOXO3a-KAT5/Tip60 protein complex. Finally, we show that pharmacological induction of FOXO3a nuclear localization sensitizes NOTCH1-driven cancers to DNA-damage-induced cell death.
|MeSH||Animals Ataxia Telangiectasia Mutated Proteins / genetics* Ataxia Telangiectasia Mutated Proteins / metabolism Binding, Competitive Cell Death / drug effects Cell Death / radiation effects Cell Line, Tumor DNA Breaks, Double-Stranded DNA Repair* Forkhead Box Protein O3 / genetics* Forkhead Box Protein O3 / metabolism Gamma Rays Gene Expression Regulation HEK293 Cells HeLa Cells Humans Lymphocytes / drug effects Lymphocytes / metabolism* Lymphocytes / pathology Lymphocytes / radiation effects Lysine Acetyltransferase 5 / genetics* Lysine Acetyltransferase 5 / metabolism Metformin / pharmacology Mice Mouse Embryonic Stem Cells / cytology Mouse Embryonic Stem Cells / drug effects Mouse Embryonic Stem Cells / metabolism Mouse Embryonic Stem Cells / radiation effects Protein Binding Receptor, Notch1 / genetics* Receptor, Notch1 / metabolism Signal Transduction|
|Human and Animal Cells||HeLa/Fucci(RCB2812 )|