CKI-7 free base is a potent and ATP-competitive inhibitor of casein kinase 1 (CK1; IC50: 6 μM; Ki: 8.5 μM) and a selective Cdc7 kinase inhibitor. CKI-7 free base also inhibits SGK, ribosomal S6 kinase-1 (S6K1), and MSK1.
SB-747651A is a potent, ATP-competitive inhibitor of mitogen- and stress-activated kinase 1 (MSK1, IC50 = 11 nM). It targets the N-terminal kinase domain. SB-747651A inhibits MSK1, MSK2, PKA, PKB, RSK and p70S6K activity in cells.
TAT-DEF-Elk-1 TFA is a cell-penetrating peptide Elk-1 inhibitor, mimics and specifically interferes with the DEF domain of Elk-1. TAT-DEF-Elk-1 blocks Elk-1 phosphorylation and prevents Elk-1 nuclear translocation without interfering with ERK nor MSK1 act