Keratin-binding protein required for epithelial cell polarization. Involved in apical junction complex (AJC) assembly via its interaction with PARD3. Required for ciliogenesis. May interact with FAS cytoplasmic domain (By similarity). Interacts with PARD3 (By similarity) (PubMed:18838552). Interacts with TRAPPC14 (PubMed:31467083). Localizes specifically to the distal appendage region of the centriole, which anchors the mother centriole to the plasma membrane. Localizes to the apical junction complex (AJC) in epithelial cells. Present in various epithelial cells (at protein level). Truncated N-terminus. Extended N-terminus.