Artículo

Plazas, P.V.; Katz, E.; Gomez-Casati, M.E.; Bouzat, C.; Elgoyhen, A.B. "Stoichiometry of the α9α10 nicotinic cholinergic receptor" (2005) Journal of Neuroscience. 25(47):10905-10912
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Abstract:

The α9 and α10 nicotinic cholinergic subunits assemble to form the receptor that mediates synaptic transmission between efferent olivocochlear fibers and hair cells of the cochlea. They are the latest vertebrate nicotinic cholinergic receptor (nAChR) subunits that have been cloned, and their identification has established a distant early divergent branch within the nAChR gene family. The α10 subunit serves as a "structural" component leading to heteromeric α9α10 nAChRs with distinct properties. We now have probed the stoichiometry of recombinant α9α10 nAChRs expressed in Xenopus oocytes. We have made use of the analysis of the population of receptors assembled from a wild-type subunit and its partner α9 or α10 subunit bearing a reporter mutation of a valine to threonine at position 13′ of the second transmembrane domain (TM2). Because the mutation increased the sensitivity of the receptor for acetylcholine (ACh) but mutations at different subunits were not equivalent, the number of α9 and α10 subunits could be inferred from the number of components in compound concentration-response curves to ACh. The results were confirmed via the analysis of the effects of a mutation to threonine at position 17′ of TM2. Because at this position the mutations at different subunits were equivalent, the stoichiometry was inferred directly from the shifts in the ACh EC 50 values. We conclude that the recombinant α9α10 receptor is a pentamer with a (α9)2(α10)3 stoichiometry. Copyright © 2005 Society for Neuroscience.

Registro:

Documento: Artículo
Título:Stoichiometry of the α9α10 nicotinic cholinergic receptor
Autor:Plazas, P.V.; Katz, E.; Gomez-Casati, M.E.; Bouzat, C.; Elgoyhen, A.B.
Filiación:Institute of Investigations in Genetic Engineering and Molecular Biology, National Council of Scientific and Technical Investigations, University of Buenos Aires, Buenos Aires 1428, Argentina
Department of Physiology, Molecular and Cellular Biology, Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires 1428, Argentina
Institute of Biochemical Investigation of Bah́a Bianca, National University of the South, National Council of Scientific and Technical Investigations, Bahía Blanca F-8000FWB, Argentina
Institute of Investigations in Genetic Engineering and Molecular Biology, University of Buenos Aires, Vue ta de Obligado 2490, Buenos Aires 1428, Argentina
Palabras clave:Cholinergic receptors; Cochlea; Ligand-gated channels; Mutagenesis; Nicotinic receptors; Stoichiometry; alpha9 alpha10 nicotinic cholinergic receptor; cholinergic receptor; ion channel; ligand; nicotinic receptor; receptor subunit; unclassified drug; acetylcholine; alpha10 acetylcholine receptor, rat; Chrna9 protein, rat; protein subunit; recombinant protein; threonine; valine; animal cell; article; cochlea; concentration response; gene mutation; molecular cloning; multigene family; mutagenesis; neurotransmitter release; nonhuman; priority journal; protein domain; rat; receptor upregulation; stoichiometry; synaptic transmission; Xenopus; amino acid sequence; animal; chemistry; drug effect; female; genetics; mathematics; metabolism; nucleotide sequence; oocyte; osmolarity; Xenopus laevis; Acetylcholine; Amino Acid Sequence; Animals; Conserved Sequence; Female; Mathematics; Oocytes; Osmolar Concentration; Protein Subunits; Rats; Receptors, Nicotinic; Recombinant Proteins; Threonine; Valine; Xenopus laevis
Año:2005
Volumen:25
Número:47
Página de inicio:10905
Página de fin:10912
DOI: http://dx.doi.org/10.1523/JNEUROSCI.3805-05.2005
Título revista:Journal of Neuroscience
Título revista abreviado:J. Neurosci.
ISSN:02706474
CODEN:JNRSD
CAS:acetylcholine, 51-84-3, 60-31-1, 66-23-9; threonine, 36676-50-3, 72-19-5; valine, 7004-03-7, 72-18-4; Acetylcholine, 51-84-3; alpha10 acetylcholine receptor, rat; Chrna9 protein, rat; Protein Subunits; Receptors, Nicotinic; Recombinant Proteins; Threonine, 72-19-5; Valine, 7004-03-7
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02706474_v25_n47_p10905_Plazas

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Citas:

---------- APA ----------
Plazas, P.V., Katz, E., Gomez-Casati, M.E., Bouzat, C. & Elgoyhen, A.B. (2005) . Stoichiometry of the α9α10 nicotinic cholinergic receptor. Journal of Neuroscience, 25(47), 10905-10912.
http://dx.doi.org/10.1523/JNEUROSCI.3805-05.2005
---------- CHICAGO ----------
Plazas, P.V., Katz, E., Gomez-Casati, M.E., Bouzat, C., Elgoyhen, A.B. "Stoichiometry of the α9α10 nicotinic cholinergic receptor" . Journal of Neuroscience 25, no. 47 (2005) : 10905-10912.
http://dx.doi.org/10.1523/JNEUROSCI.3805-05.2005
---------- MLA ----------
Plazas, P.V., Katz, E., Gomez-Casati, M.E., Bouzat, C., Elgoyhen, A.B. "Stoichiometry of the α9α10 nicotinic cholinergic receptor" . Journal of Neuroscience, vol. 25, no. 47, 2005, pp. 10905-10912.
http://dx.doi.org/10.1523/JNEUROSCI.3805-05.2005
---------- VANCOUVER ----------
Plazas, P.V., Katz, E., Gomez-Casati, M.E., Bouzat, C., Elgoyhen, A.B. Stoichiometry of the α9α10 nicotinic cholinergic receptor. J. Neurosci. 2005;25(47):10905-10912.
http://dx.doi.org/10.1523/JNEUROSCI.3805-05.2005