Enables protein-macromolecule adaptor activity. Involved in negative regulation of protein secretion. Acts upstream of or within establishment of epithelial cell polarity. Located in bicellular tight junction. Is expressed in cerebral cortex; ganglia; heart; paraxial mesenchyme; and thymus primordium. Orthologous to human FRMD4A (FERM domain containing 4A). [provided by Alliance of Genome Resources, Apr 2022]