Predicted to enable potassium channel activity; 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. Predicted to act upstream of or within potassium ion transmembrane transport and regulation of ion transmembrane transport. Predicted to be located in apical plasma membrane. Predicted to be part of voltage-gated potassium channel complex. Is expressed in heart and heart ventricle. Orthologous to human KCNE4 (potassium voltage-gated channel subfamily E regulatory subunit 4). [provided by Alliance of Genome Resources, Apr 2022]