Nicotinic Acetylcholine Receptor (Neuromuscular Junction) (nAChR)

The nicotinic acetylcholine receptor (nAChR) at the neuromuscular junction is a pentameric ligand-gated cation channel essential for converting neural signals into muscular action. Its unique structure enables rapid response upon neurotransmitter binding—making it vital for all voluntary movements—and it serves as an important pharmacological target both clinically and evolutionarily. It is composed of five subunits (2α1, β1, δ, and γ/ε) and is activated by acetylcholine, leading to sodium and potassium ion flux and subsequent muscle contraction. Dysfunction of this receptor is implicated in diseases like myasthenia gravis.

Other names

Muscle-type Nicotinic Acetylcholine ReceptorNeuromuscular Junction nAChRnAChR at the Neuromuscular Junction

Agonist binding leads to channel opening and ion influx/efflux, causing membrane depolarization. Antagonists block the receptor, preventing acetylcholine binding and subsequent depolarization.