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MGP005446

UniProt Annotations

Entry Information
Gene Namecholinergic receptor, nicotinic, alpha 9 (neuronal)
Protein EntryACHA9_HUMAN
UniProt IDQ9UGM1
SpeciesHuman
Comments
Comment typeDescription
FunctionIonotropic receptor with a probable role in the modulation of auditory stimuli. Agonist binding induces a conformation change that leads to the opening of an ion-conducting channel across the plasma membrane (PubMed:11752216, PubMed:25282151). The channel is permeable to a range of divalent cations including calcium, the influx of which may activate a potassium current which hyperpolarizes the cell membrane (PubMed:11752216, PubMed:25282151). In the ear, this may lead to a reduction in basilar membrane motion, altering the activity of auditory nerve fibers and reducing the range of dynamic hearing. This may protect against acoustic trauma. May also regulate keratinocyte adhesion (PubMed:11021840). {ECO:0000269|PubMed:11021840, ECO:0000269|PubMed:11752216, ECO:0000269|PubMed:25282151, ECO:0000305}.
MiscellaneousThe hetero-oligomeric receptor composed of CHRNA9 and CHRNA10 has an atypical pharmacological profile, binding several non-nicotinic ligands including strychnine (a glycine receptor antagonist) and atropine (a muscarinic acetylcholine receptor antagonist). {ECO:0000305|PubMed:11752216}.
PtmN-glycosylated. {ECO:0000269|PubMed:25282151}.
SimilarityBelongs to the ligand-gated ion channel (TC 1.A.9) family. Acetylcholine receptor (TC 1.A.9.1) subfamily. Alpha- 9/CHRNA9 sub-subfamily. {ECO:0000305}.
Subcellular LocationCell junction, synapse, postsynaptic cell membrane {ECO:0000305}; Multi-pass membrane protein {ECO:0000305}. Cell membrane {ECO:0000269|PubMed:25282151}; Multi-pass membrane protein {ECO:0000305|PubMed:25282151}.
SubunitCan form homo- or hetero-oligomeric channels in conjunction with CHRNA10 (PubMed:11752216). The native outer hair cell receptor may be composed of CHRNA9-CHRNA10 hetero-oligomers. {ECO:0000269|PubMed:11752216}.
Tissue SpecificityExpressed in cochlea, keratinocytes, pituitary gland, B-cells and T-cells. {ECO:0000269|PubMed:11021840, ECO:0000269|PubMed:11752216, ECO:0000269|PubMed:15531379}.
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