Numb is thought to be a phosphotyrosine binding (PTB) domain containing cargo specific adaptor protein, which links specific cargo to the endocytic machinery. It associates with collapsin response mediator protein-2 (CRMP 2) with its PTB domain and alpha adaptin (a subunit of the AP 2 adaptor complex) through its tripeptide Asp-Pro-Phe (DPF) motif, and is involved in clathrin dependent endocytosis at the plasma membrane. Numb is associated with L1 under physiological conditions and functions in endocytosis of L1 in the C domain membrane of axonal growth cones.
Matsuura, Y, Kato, K, Kaibuchi, K, Kamiguchi, H, Nishimura, T, Fukata, Y, Yamaguchi, T
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