Predicted to enable cell adhesion molecule binding activity. Acts upstream of or within regulation of G1/S transition of mitotic cell cycle. Located in several cellular components, including apical plasma membrane; bicellular tight junction; and cytosol. Is expressed in alimentary system epithelium and genitourinary system. Orthologous to human TJP3 (tight junction protein 3). [provided by Alliance of Genome Resources, Apr 2022]