Involved in modulation of chemical synaptic transmission. Acts upstream of or within excitatory synapse assembly and postsynaptic density protein 95 clustering. Located in several cellular components, including dendritic spine; glutamatergic synapse; and postsynaptic membrane. Is active in Schaffer collateral - CA1 synapse. Is integral component of postsynaptic density membrane. Is expressed in several structures, including branchial arch; central nervous system; metanephros; sensory organ; and vibrissa. Orthologous to human LRRC4 (leucine rich repeat containing 4). [provided by Alliance of Genome Resources, Apr 2022]