Fig. 2: Cryo-EM structures of a KRAS/BRAF/MEK1/14-3-3 complex.

a Structure of the KRAS/BRAF/MEK1/14-3-3 complex in the “RAS up” conformation. A ribbon diagram of the structure, colored as in Figure 1a, is shown together with the transparent cryo-EM density map. b Structure of the KRAS/BRAF/MEK1/14-3-3 complex in the “RAS front” conformation, determined with the BS3 cross-linked sample. A ribbon diagram of the structure, colored as in (a) above, is shown together with the transparent cryo-EM density map.