title: Looking below the surface of nicotinic acetylcholine receptors.
abstract: The amino acid sequences of nicotinic acetylcholine receptors (nAChRs) from diverse species can be compared across extracellular, transmembrane, and intracellular domains. The intracellular domains are most divergent among subtypes, yet relatively consistent among species. The diversity indicates that each nAChR subtype has a unique language for communication with its host cell. The conservation across species also suggests that the intracellular domains have defining functional roles for each subtype. Secondary structure prediction indicates two relatively conserved alpha helices within the intracellular domains of all nAChRs. Among all subtypes, the intracellular domain of α7 nAChR is one of the most well conserved, and α7 nAChRs have effects in non-neuronal cells independent of generating ion currents, making it likely that the α7 intracellular domain directly mediates signal transduction. There are potential phosphorylation and protein-binding sites in the α7 intracellular domain, which are conserved and may be the basis for α7-mediated signal transduction.
authors.affiliation: Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32610, USA.
authors.forename: Clare
authors.initials: C
authors.lastname: Stokes
authors.affiliation: Department of Medical Neurobiology, Hadassah Medical School, Hebrew University, Jerusalem 91120, Israel.
authors.forename: Millet
authors.initials: M
authors.lastname: Treinin
authors.affiliation: Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32610, USA. Electronic address: rlpapke@ufl.edu.
authors.forename: Roger L
authors.initials: RL
authors.lastname: Papke
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017124:Conserved Sequence; D006801:Humans; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D011978:Receptors, Nicotinic / Q000737:chemistry* / Q000378:metabolism
chemical_list: D011978:Receptors, Nicotinic
keywords: cys-loop receptors; evolution; intracellular domains; protein structure; proteomics; signal transduction