Nicotinic acetylcholine receptor subunit alpha 6 (nAChRα6)

The nicotinic acetylcholine receptor subunit alpha 6 (nAChRα6) is a critical component of the insect central nervous system, forming part of the pentameric ligand-gated ion channels that mediate fast excitatory synaptic transmission (UniProt: P0CI92). In Drosophila melanogaster and many other insect species, this specific subunit is the primary molecular target for the spinosyn class of insecticides, including spinosad and spinetoram (PubMed: 22532075). These compounds bind to the receptor, causing continuous activation and over-excitation of the nervous system, which results in paralysis and eventual death of the pest (PubMed: 17030321). Because nAChRα6 is not essential for insect viability under laboratory conditions, it is a frequent site for mutations that confer high-level resistance to spinosyns (PubMed: 26063468). Such resistance often involves gene deletions, premature stop codons, or mis-splicing that leads to the loss of functional alpha 6 subunits (PubMed: 25510395). Understanding the structure and function of this receptor is vital for managing insecticide resistance and developing new crop protection strategies.

Other names

Dalpha6nAChR alpha 6ALS2Drosophila alpha 6 subunitnAChR-Dalpha6Acetylcholine receptor subunit alpha-L2

Spinosyns act as allosteric activators of the nicotinic acetylcholine receptor alpha 6 subunit, causing prolonged activation of the channel, leading to involuntary muscle contractions, paralysis, and death of the insect (PubMed: 22532075).