Predicted to enable G protein-coupled receptor activity. Involved in several processes, including negative regulation of cGMP-mediated signaling; negative regulation of transport; and regulation of transmission of nerve impulse. Predicted to be integral component of membrane. Predicted to be active in plasma membrane. Used to study acute pancreatitis. Human ortholog(s) of this gene implicated in type 2 diabetes mellitus. Orthologous to human MTNR1B (melatonin receptor 1B). [provided by Alliance of Genome Resources, Apr 2022]