Enables 5S rRNA binding activity. Predicted to be involved in ribosomal large subunit assembly. Predicted to act upstream of or within cellular response to interleukin-4. Located in ribosome. Part of cytosolic large ribosomal subunit. Is active in synapse. Orthologous to human RPL3 (ribosomal protein L3). [provided by Alliance of Genome Resources, Apr 2022]