Enables mRNA binding activity and pre-mRNA binding activity. Predicted to be involved in deadenylation-dependent decapping of nuclear-transcribed mRNA and histone mRNA catabolic process. Predicted to act upstream of or within negative regulation of neuron differentiation and stem cell population maintenance. Located in axon; dendrite; and neuronal cell body. Part of messenger ribonucleoprotein complex. Orthologous to human LSM1 (LSM1 homolog, mRNA degradation associated). [provided by Alliance of Genome Resources, Apr 2022]