Figure 1. The trametinib binding pocket in MEK extends to the KSR interaction interface.

A. Trametinib bound to KSR1:MEK1:AMP-PNP. See Extended Data Figure 1 for trametinib bound to KSR2:MEK1:AMP-PNP.
B. Trametinib contacts include A825 in the pre-helix αG loop of KSR1. Direct contacts of trametinib with MEK1 also highlighted.
C. 2D schematic of the trametinib binding pocket.