Predicted to enable beta-catenin binding activity and cytoskeletal protein binding activity. Involved in positive regulation of dendritic spine development; positive regulation of synapse assembly; and regulation of signal transduction. Acts upstream of or within several processes, including animal organ development; apical protein localization; and protein localization to adherens junction. Located in adherens junction; ciliary basal body; and postsynaptic density. Is expressed in several structures, including alimentary system; hemolymphoid system gland; lung; nervous system; and reproductive system. Orthologous to human DLG5 (discs large MAGUK scaffold protein 5). [provided by Alliance of Genome Resources, Apr 2022]