Enables several functions, including Arp2/3 complex binding activity; SNAP receptor activity; and signaling receptor binding activity. Involved in several processes, including dendritic spine maintenance; long-term synaptic depression; and regulation of receptor internalization. Located in several cellular components, including cytoplasmic vesicle; perinuclear region of cytoplasm; and postsynaptic density. Part of protein-containing complex. Is active in glutamatergic synapse and postsynaptic endocytic zone. Orthologous to human PICK1 (protein interacting with PRKCA 1). [provided by Alliance of Genome Resources, Apr 2022]