The function of ENSG00000156097 (GPR61, G protein-coupled receptor 61) is as follows. Orphan G protein-coupled receptor. Constitutively activates the G(s)-alpha/cAMP signaling pathway (PubMed:28827538). Shows a reciprocal regulatory interaction with the melatonin receptor MTNR1B most likely through receptor heteromerization (PubMed:28827538). May be involved in the regulation of food intake and body weight (By similarity). {ECO:0000250|UniProtKB:Q8C010, ECO:0000269|PubMed:28827538}.