SR-3677 is an effective and specific inhibitor of ROCK2 (IC50: 3 nM).

ROCK1:56 nM, ROCK2:3 nM

5 μL mixture of a 1 μM STK2 substrate and ATP (ROCK-I: 4 μM; ROCK-II: 20 μM) in STK-buffer is added to the wells. 20 nL of test compounds (SR-3677) is dispensed. The reaction is started by addition of 5 μL of 2.5 nM. ROCK-I or 0.5 nM ROCK-II in STK-buffer. After 4 h at RT, the reaction is stopped by the addition of 10 μL of 1x antibody and 62.5 nM Sa-XL in the detection buffer.