Subunit of nicotinic acetylcholine receptor (nAChR) (PubMed:23351035). Involved in nAChR sensitivity to nicotine (PubMed:23351035). Modulates locomotion towards the drug nicotine (PubMed:23351035). Belongs to the ligand-gated ion channel (TC 1.A.9) family. Acetylcholine receptor (TC 1.A.9.1) subfamily.