Enables protein C-terminus binding activity. Involved in positive regulation of neuron projection development and response to organic cyclic compound. Located in several cellular components, including axon initial segment; dendritic spine; and postsynaptic density. Is active in glutamatergic synapse. Is integral component of postsynaptic density membrane. Colocalizes with actin cytoskeleton. Orthologous to human LRRC7 (leucine rich repeat containing 7). [provided by Alliance of Genome Resources, Apr 2022]