Promotes the translocation of slo-1 potassium ion channels from the endoplasmic reticulum to its final destination at the plasma membrane, probably by shielding from premature proteasomal degradation in the endoplasmic reticulum. Localizes to puncta throughout synaptic terminals and dendrites. Expressed in tissues including muscles, intestine and neurons. Hypersensitive to the acetylcholinesterase inhibitor aldicarb. In a slo-1 (ky399gf) gain of function mutant, restores normal locomotory speed and sensitivity to aldicarb. Belongs to the ERG28 family.