Enables calcium ion binding activity and transmembrane receptor protein tyrosine kinase activity. Involved in several processes, including GDF15-GFRAL signaling pathway; neuron cell-cell adhesion; and positive regulation of signal transduction. Located in endosome membrane. Part of plasma membrane protein complex and receptor complex. Is active in plasma membrane. Implicated in several diseases, including Hirschsprung's disease; familial medullary thyroid carcinoma; multiple endocrine neoplasia type 2A; multiple endocrine neoplasia type 2B; and pheochromocytoma. Biomarker of pancreatic cancer.