Predicted to enable potassium channel regulator activity and transmembrane transporter binding activity. Predicted to contribute to delayed rectifier potassium channel activity and voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization. Predicted to be involved in several processes, including ion transmembrane transport; regulation of heart rate by cardiac conduction; and regulation of ion transmembrane transport. Located in apical plasma membrane. Orthologous to human KCNE4 (potassium voltage-gated channel subfamily E regulatory subunit 4). [provided by Alliance of Genome Resources, Apr 2022]