ATM Protein

The Serine/threonine protein kinase ataxia-telangiectasia mutated (ATM) is an atypical kinase of the phosphoinositide 3-kinase (PI3K)-related protein kinase PIKK family, which also includes ATM and Rad3-related protein (ATR), the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs), hSMG1, and mammalian target of rapamycin (mTOR) kinases (1). It plays a prominent role as an apical activator of the DNA damage response under the circumstance of DNA double-strand breaks (DSBs). Following induction of DSBs, ATM mobilizes one of the most extensive signaling networks that responds to specific stimuli and modifies directly or indirectly a broad range of targets (2).