Predicted to enable cholecystokinin receptor activity. Predicted to be involved in G protein-coupled receptor signaling pathway; cellular response to hormone stimulus; and regulation of hormone secretion. Predicted to act upstream of or within signal transduction. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in gut. Human ortholog(s) of this gene implicated in obesity. Orthologous to human CCKAR (cholecystokinin A receptor).