DOK proteins are enzymatically inert adaptor or scaffolding proteins. They provide a docking platform for the assembly of multimolecular signaling complexes. DOK5 functions in RET-mediated neurite outgrowth and plays a positive role in activation of the MAP kinase pathway. Putative link with downstream effectors of RET in neuronal differentiation. Interacts with phosphorylated RET. In contrast to other DOK proteins, it does not interact with RASGAP (By similarity). Highest expression in skeletal muscle, lower in brain, heart and kidney. Also detected in activated peripheral blood T-lymphocytes. PTB domain mediates receptor interaction. Phosphorylated on tyrosine residues in response to insulin, IGF1 and GDNF. Belongs to the DOK family. Type B subfamily.