Enables protein C-terminus binding activity and protein domain specific binding activity. Involved in regulation of postsynaptic neurotransmitter receptor activity. Located in basal part of cell; cytosol; and glutamatergic synapse. Is active in postsynaptic density. Is expressed in several structures, including alimentary system; brain; cranial ganglion; cranial nerve; and sensory organ. Orthologous to human HOMER3 (homer scaffold protein 3). [provided by Alliance of Genome Resources, Apr 2022]