- EMDB-40753: The 2alpha3beta stoichiometry of full-length human alpha4beta2 ni... -
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データベース: EMDB / ID: EMD-40753
タイトル
The 2alpha3beta stoichiometry of full-length human alpha4beta2 nicotinic acetylcholine receptor in complex with acetylcholine
マップデータ
試料
複合体: A complex of three Fab fragments with the 2alpha3beta stoichiometry of the full-length human alpha4beta2 nicotinic receptor bound to acetylcholine
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)
DA047848
米国
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)
DA042072
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS120496
米国
引用
ジャーナル: Br J Pharmacol / 年: 2024 タイトル: Structural bases for stoichiometry-selective calcium potentiation of a neuronal nicotinic receptor. 著者: Simone Mazzaferro / Guipeun Kang / Kathiresan Natarajan / Ryan E Hibbs / Steven M Sine / 要旨: BACKGROUND AND PURPOSE: α4β2 nicotinic acetylcholine (nACh) receptors assemble in two stoichiometric forms, one of which is potentiated by calcium. The sites of calcium binding that underpin potentiation are not known. EXPERIMENTAL APPROACH: To identify calcium binding sites, we applied cryo-electron microscopy (cryo-EM) and molecular dynamics (MD) simulations to each stoichiometric form of the α4β2 nACh receptor ...EXPERIMENTAL APPROACH: To identify calcium binding sites, we applied cryo-electron microscopy (cryo-EM) and molecular dynamics (MD) simulations to each stoichiometric form of the α4β2 nACh receptor in the presence of calcium ions. To test whether the identified calcium sites are linked to potentiation, we generated mutants of anionic residues at the sites, expressed wild type and mutant receptors in clonal mammalian fibroblasts, and recorded ACh-elicited single-channel currents with or without calcium. KEY RESULTS: Both cryo-EM and MD simulations show calcium bound to a site between the extracellular and transmembrane domains of each α4 subunit (ECD-TMD site). Substituting alanine for anionic ...KEY RESULTS: Both cryo-EM and MD simulations show calcium bound to a site between the extracellular and transmembrane domains of each α4 subunit (ECD-TMD site). Substituting alanine for anionic residues at the ECD-TMD site abolishes stoichiometry-selective calcium potentiation, as monitored by single-channel patch clamp electrophysiology. Additionally, MD simulation reveals calcium association at subunit interfaces within the extracellular domain. Substituting alanine for anionic residues at the ECD sites reduces or abolishes stoichiometry-selective calcium potentiation. CONCLUSIONS AND IMPLICATIONS: Stoichiometry-selective calcium potentiation of the α4β2 nACh receptor is achieved by calcium association with topographically distinct sites framed by anionic ...CONCLUSIONS AND IMPLICATIONS: Stoichiometry-selective calcium potentiation of the α4β2 nACh receptor is achieved by calcium association with topographically distinct sites framed by anionic residues within the α4 subunit and between the α4 and β2 subunits. Stoichiometry-selective calcium potentiation could result from the greater number of calcium sites in the stoichiometric form with three rather than two α4 subunits. The results are relevant to modulation of signalling via α4β2 nACh receptors in physiological and pathophysiological conditions.
全体 : A complex of three Fab fragments with the 2alpha3beta stoichiomet...
全体
名称: A complex of three Fab fragments with the 2alpha3beta stoichiometry of the full-length human alpha4beta2 nicotinic receptor bound to acetylcholine
要素
複合体: A complex of three Fab fragments with the 2alpha3beta stoichiometry of the full-length human alpha4beta2 nicotinic receptor bound to acetylcholine
超分子 #1: A complex of three Fab fragments with the 2alpha3beta stoichiomet...
超分子
名称: A complex of three Fab fragments with the 2alpha3beta stoichiometry of the full-length human alpha4beta2 nicotinic receptor bound to acetylcholine タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#4