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Comparative structure of human neuronal α2–α7 and β2–β4 nicotinic acetylcholine receptor subunits and functional expression of the α2, α3, α4, α7, β2, and β4 subunits

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Abstract

cDNA clones encoding human neuronal nicotinic acetylcholine receptor α2, α3, α4, α5, α6, α7, β2, β3, and β4 subunits were isolated from brainstem, hippocampus, prefrontal cortex, substantia nigra, thalamus, and IMR32 libraries. Human α2 and α6 and full-length β3 and β4 clones have not been previously reported. Deduced amino acid sequences of the α2, α6, β3, and β4 predicted mature peptides are 503 residues (56.9 kDa), 464 residues (53.7 kDa), 440 residues (50.8 kDa), and 477 residues (54.1 kDa), respectively. These sequences show 84 (α2), 87 (α6), 89 (β3), and 84% (β4) identity to the corresponding rat sequences. The amino termini of the human α2 and β3 mature peptides contain 23 and six additional residues, respectively, compared to those of rat α2 and β3. Recombinant receptors were expressed inXenopus laevis oocytes injected with in vitro transcripts encoding either α7 alone or α2, α3, or α4 in pairwise combination with β2 or β4. Inward currents were elicited by the application of acetylcholine (1–100 µM) and other agonists; these responses were blocked 65–97% by application of 10 µM d-tubocurare, confirming functional expression of human nicotinic receptors.

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  1. SIBIA Neurosciences Inc., 505 Coast Boulevard South, La Jolla, CA

    Kathryn J. Elliott, Steven B. Ellis, Kelly J. Berckhan, Arturo Urrutia, Laura E. Chavez-Noriega, Edwin C. Johnson, Gönül Veliçelebi & Michael M. Harpold

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  1. Kathryn J. Elliott
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  2. Steven B. Ellis
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  3. Kelly J. Berckhan
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Elliott, K.J., Ellis, S.B., Berckhan, K.J. et al. Comparative structure of human neuronal α2–α7 and β2–β4 nicotinic acetylcholine receptor subunits and functional expression of the α2, α3, α4, α7, β2, and β4 subunits. J Mol Neurosci 7, 217–228 (1996). https://doi.org/10.1007/BF02736842

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  • DOI: https://doi.org/10.1007/BF02736842

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