The tyrosine based sorting motif (YRSLE) in L1CD is required for clathrin mediated endocytosis. Y1176 of the YRSLE motif is phosphorylated by SRC tyrosine kinase associated with lipid rafts in the P-domain of the growth cone. Phosphorylation of Y1176 prevents L1 binding to AP-2, an adaptor required for clathrin mediated internalization of L1.
Landreth, G, Rapoport, I, Kamei, Y, Schaefer, AW, Beach, CM, Lemmon, SK, Kamiguchi, H, Lemmon, V, Kirchhausen, Tomas, Wong, EV
protein tyrosine kinase activity of SRC-1 [cytosol]
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