High-affinity epithelial cell surface receptor for APF. Mediates the anchoring of the endoplasmic reticulum to microtubules. Interacts with REEP5. Translocates to the perinuclear region upon APF-stimulation. Expressed in cardiomyocytes (at protein level). Reversibly palmitoylated. Palmitoylation at Cys-79 by DHHC2 is required for its trafficking from the ER to the plasma membrane and for its perinuclear localization (By similarity). Increased phosphorylation during mitosis prevents binding to microtubules. Extended N-terminus. Contaminating sequence. Vector contamination at the N-terminus.