Enables identical protein binding activity; phosphatidylinositol phosphate binding activity; and protein phosphatase binding activity. Involved in several processes, including bicellular tight junction assembly; establishment of epithelial cell polarity; and protein targeting to membrane. Located in axonal growth cone; cell-cell junction; and neuronal cell body. Part of protein-containing complex. Orthologous to human PARD3 (par-3 family cell polarity regulator). [provided by Alliance of Genome Resources, Apr 2022]