Enables several functions, including ATPase binding activity; lamin binding activity; and nucleic acid binding activity. Involved in several processes, including animal organ development; cellular response to organonitrogen compound; and regulation of synapse organization. Located in several cellular components, including axon terminus; dendritic spine; and postsynaptic density. Part of protein-DNA complex. Is active in glutamatergic synapse and postsynapse. Orthologous to human HNRNPK (heterogeneous nuclear ribonucleoprotein K). [provided by Alliance of Genome Resources, Apr 2022]