ErbB3 is a member of the EGFR/erbB receptor tyrosine kinase family. ErbB3 lacks intrinsic kinase activity due to an amino acid substitution within the ATP binding site. Upon heterodimerization with the other erbB family members, erbB3 becomes phosphorylated at multiple tyrosine residues that represent docking sites for downstream signaling proteins, e.g. PI3K, grb7 and shc. The erbB3 cytoplasmic domain contains 6 docking sites for PI3K. Thus, erbB3 is a potent activator of the PI3K/PKB signaling pathway.
ERBB3; v-erb-b2 erythroblastic leukemia viral oncogene homolog 3 (avian); LCCS2, lethal congenital contracture syndrome 2; receptor tyrosine-protein kinase erbB-3; HER3; proto-oncogene-like protein c-ErbB-3; tyrosine kinase-type cell surface receptor HER3; LCCS2; ErbB-3; c-erbB3; erbB3-S; MDA-BF-1; c-erbB-3; p180-ErbB3; p45-sErbB3; p85-sErbB3; MGC88033; v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 3; receptor tyrosine-protein kinase; v-erb-b2 erythroblastic leukemia viral oncogene homolog 3