α-conotoxin-MI

α-conotoxin MI (alpha-conotoxin MI) is a conotoxin that has been isolated from the venom of the cone snail Conus magus. α-conotoxin MI is a competitive antagonist of the muscle-type nicotinic acetylcholine receptors (nAChR) such as α-conotoxin GI or d-Turbocurarine. It binds to the receptor with a Kd value ~0,94nM. α-conotoxin MI allows to distinguish between the two agonist sites as it binds 10,000-fold more tightly to the α/δ than to the α/γ site.