Figure 3.

Inhibition of Ras signaling by B4-27. (a, b) Dose-de-pendent inhibition of the interaction between KRasG12V (a) or KRasG12D (b) and CRAF RBD by B4-27 or B3-4 in HEK293T cells as monitored by the BRET2 assay.37 BRET signals reported represent the mean ± SD from 4 independent experiments and are relative to that of vehicle (DMSO)-treated cells (100%). ****, p < 0.0001. (c) Western blots showing the effect of B4-27 on the phosphorylation levels of signaling proteins downstream of Ras (Akt, MEK) in H358 cells. GAPDH was used as a loading control. Representative images from 4 independent experiments are shown.