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Description

A cell-permeable nitroindolo-guanidinohydrazone compound that acts as a potent, ATP-competitive, and highly selective Chk2 inhibitor (IC50 = 138 and 570 nM against the phosphorylation of histone H1 by Chk2 in the presence of 10 microM and 1 mM of ATP, respectively), while exhibiting much reduced or no activity against a panel of 52 other cellular kinases, including Chk1 (IC50 = 15.73 and 55 microM against substrate phosphorylation and Chk1 autophosphorylation with 10 microM ATP). Shown to effectively suppress radiation-induced phosphorylation of Chk2 (on Ser516) and its downstream substrate Cdc25c (on Ser216) in MCF7 cultures (IC50-/- cultures., A cell-permeable nitroindolo-guanidinohydrazone compound that acts as a potent, ATP-competitive, and highly selective Chk2 inhibitor (IC50 = 138 and 570 nM against the phosphorylation of histone H1 by Chk2 in the presence of 10 microM and 1 mM of ATP, respectively), while exhibiting much reduced or no activity against a panel of 52 other cellular kinases, including Chk1 (IC50 = 15.73 and 55 microM against substrate phosphorylation and Chk1 autophosphorylation with 10 microM ATP). Shown to effectively suppress radiation-induced phosphorylation of Chk2 (on Ser516) and its downstream substrate Cdc25c (on Ser216) in MCF7 cultures (IC50-/- cultures.