Enables potassium channel regulator activity. Involved in protein localization to plasma membrane and regulation of potassium ion transmembrane transport. Located in plasma membrane. Part of voltage-gated potassium channel complex. Is expressed in cerebral cortex intermediate zone; cerebral cortex marginal layer; and cortical subplate. Human ortholog(s) of this gene implicated in asthma. Orthologous to human DPP10 (dipeptidyl peptidase like 10). [provided by Alliance of Genome Resources, Apr 2022]