Enables protein C-terminus binding activity. Involved in negative regulation of ATPase activity and negative regulation of ion transport. Acts upstream of or within modulation of chemical synaptic transmission. Located in cytoplasm and plasma membrane. Part of protein-containing complex. Is expressed in brain and spinal cord. Orthologous to human PXK (PX domain containing serine/threonine kinase like). [provided by Alliance of Genome Resources, Apr 2022]