KU-55933是ATM抑制剂，IC50和Ki分别为13和2.2 nM，对DNA-PK，PI3K/PI4K，ATR和mTOR的活性较低。A cell-permeable, potent, selective and ATP-competitive ATM inhibitor KU-55933 (ATM Kinase Inhibitor) is a potent and specific ATM inhibitor with IC50/Ki of 12.9 nM/2.2 nM in cell-free assays, and is highly selective for ATM as compared to DNA-PK, PI3K/PI4K, ATR and mTOR. A cell-permeable, potent, selective and ATP-competitive ATM inhibitor