Predicted to enable protein kinase binding activity. Involved in several processes, including asymmetric protein localization involved in cell fate determination; basal protein localization; and oogenesis. Located in several cellular components, including apicolateral plasma membrane; lateral plasma membrane; and tight junction. Is active in type Ib terminal bouton. Colocalizes with presynaptic membrane. Is expressed in several structures, including epithelial cell; eye photoreceptor cell; ganglia; neuron projection bundle; and synaptic neuropil domain. Used to study benign neoplasm; cancer; carcinoma; chromosome 3q29 microdeletion syndrome; and developmental disorder of mental health. Human ortholog(s) of this gene implicated in autosomal dominant intellectual developmental disorder; invasive ductal carcinoma; and non-syndromic X-linked intellectual disability 90. Orthologous to several human genes including DLG1 (discs large MAGUK scaffold protein 1); DLG3 (discs large MAGUK scaffold protein 3); and DLG4 (discs large MAGUK scaffold protein 4).