Olfactory receptor that is activated by the binding of organosulfur odorants with thioether groups such as (methylthio)methanethiol (MTMT) and bis(methylthiomethyl) disulfide (PubMed:22328155, PubMed:25185561, PubMed:25901328, PubMed:29659735). Also binds odorants cis-cyclooctene and tert-butyl mercaptan (PubMed:27019154). The activity of this receptor is mediated by G proteins which activate adenylyl cyclase (Potential). Copper binding enhances receptor activity in response to odorant binding. Expressed in olfactory epithelium, specifically in the olfactory sensory neurons of the septal organ. Detected at very low levels at 18 dpc and increased to its maximum level of expression by 7 days after birth in olfactory sensory neurons of the septal organ. Belongs to the G-protein coupled receptor 1 family.