ETP-46464

ETP-46464 is a potent inhibitor against mTOR, ATR, DNA-PK, PI 3-Kα and ATM with IC50 of 0.6, 14, 36, 170 and 545 nM, respectively. ETP-46464 preferentially suppresses radiation-induced cellular ATR activity (>90% at 500 nM) over ATM or DNA-PK activity (IC50 > 5 μM) in U2OS cells, while exhibiting much reduced or little potency toward a panel of 26 other kinases (>55% inhibition at 5 μM). ETP-46464 (10 μM) inhibited the UV-induced phosphorylation of CHK1 serine 317. Further, the phosphorylation of ATM serine 1981 was increased in cells incubated in 10 μM ETP-46464 and exposed to 10 J/m2 UV.