Enables PDZ domain binding activity. Predicted to be involved in several processes, including negative regulation of proteasomal ubiquitin-dependent protein catabolic process; positive regulation of melanin biosynthetic process; and positive regulation of transforming growth factor beta receptor signaling pathway. Predicted to act upstream of or within several processes, including cellular response to interleukin-7; endothelial cell migration; and glutamate secretion. Located in several cellular components, including brush border; cytosol; and endocytic vesicle. Orthologous to human GIPC1 (GIPC PDZ domain containing family member 1). [provided by Alliance of Genome Resources, Apr 2022]