Auxiliary subunit of the NALCN sodium channel complex, a voltage-gated ion channel responsible for the resting Na(+) permeability that controls neuronal excitability (By similarity). Activated by neuropeptides substance P, neurotensin, and extracellular Ca(2+) that regulates neuronal excitability by controlling the sizes of NALCN-dependent sodium-leak current. UNC80 is essential for NALCN sensitivity to extracellular Ca(2+) (By similarity).
Subcellular locations: Cell membrane
Moderately expressed in fetal brain, spinal cord, skeletal muscle, thymus, spleen, fetal liver, small intestine, colon, kidney and uterus. Highly expressed in adrenal gland, prostate and testis, as well as in brain and cerebellum.