Phosphorylation of ERK-1/2 promotes its homodimerization
Scaffolds and ERK dimers are essential for the activation of cytoplasmic but not nuclear substrates.
Dimerization is critical for connecting the scaffolded ERK complex to cognate cytoplasmic substrates.
Contrarily, nuclear substrates associate to ERK monomers.
Mnk1 and Mnk2 bind to Erk1, Erk2 and p38 but not JNK
Mnk1 and Mnk2 are in vitro substrates of Erk2 and p38
Mnk1 is a MAP kinase-activated eIF-4E kinase