Enables cholesterol binding activity. Involved in cholesterol efflux and intracellular cholesterol transport. Located in lysosome. Is expressed in nervous system; respiratory system; and stomach. Used to study Niemann-Pick disease. Human ortholog(s) of this gene implicated in Niemann-Pick disease and Niemann-Pick disease type C2. Orthologous to human NPC2 (NPC intracellular cholesterol transporter 2). [provided by Alliance of Genome Resources, Apr 2022]