Conserved docking site is essential for activation of mammalian MAP kinase kinases by specific MAP kinase kinase kinases.
Takekawa M, Tatebayashi K, Saito H, Mol Cell, 2005 Apr 29 - link

A docking site determining specificity of Pbs2 MAPKK for Ssk2/Ssk22 MAPKKKs in the yeast HOG pathway.
Tatebayashi K, Takekawa M, Saito H, EMBO J, 2003 Jul 15 - link