Predicted to enable alpha-catenin binding activity; beta-catenin binding activity; and cadherin binding activity. Involved in positive regulation of dendrite morphogenesis; regulation of neuron differentiation; and regulation of postsynaptic specialization assembly. Located in apical part of cell and dendritic spine. Is active in glutamatergic synapse and postsynaptic density. Orthologous to human NUMB (NUMB endocytic adaptor protein). [provided by Alliance of Genome Resources, Apr 2022]