Enables transmembrane transporter binding activity. Acts upstream of or within action potential. Located in several cellular components, including neuronal cell body membrane; perikaryon; and synaptic membrane. Is expressed in eye; genitourinary system; gut; heart; and nervous system. Orthologous to human KCNC2 (potassium voltage-gated channel subfamily C member 2). [provided by Alliance of Genome Resources, Apr 2022]