Enables PDZ domain binding activity. Predicted to be involved in potassium ion import across plasma membrane; protein homotetramerization; and regulation of ion transmembrane transport. Located in T-tubule; dendrite; and neuronal cell body. Orthologous to human KCNJ12 (potassium inwardly rectifying channel subfamily J member 12) and KCNJ18 (potassium inwardly rectifying channel subfamily J member 18). [provided by Alliance of Genome Resources, Apr 2022]