Kobe0065

Kobe0065 exhibits potent activity to competitively inhibit the binding of H-Ras·GTP to c-Raf-1 RBD with a Ki value of 46 ± 13 μM. Kobe0065 reduced the amount of c-Raf-1 associated with H-Ras G12V in NIH 3T3 cells in a dose-dependent manner, indicating the inhibition of the cellular activity of Ras. Kobe0065 at 20 μM efficiently inhibited the phosphorylation of MEK and ERK, downstream kinases of Raf in NIH 3T3 cells transiently expressing H-Ras G12V, although the effect was slightly weaker than that of 2 μM sorafenib.