+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-40753 | ||||||||||||
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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 |
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キーワード | cys-loop ligand-gated pentameric ion channels / cation-selective channel / acetylcholine / TRANSPORT PROTEIN | ||||||||||||
機能・相同性 | 機能・相同性情報 vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / synaptic transmission involved in micturition / quaternary ammonium group binding / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / central nervous system projection neuron axonogenesis ...vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / synaptic transmission involved in micturition / quaternary ammonium group binding / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / central nervous system projection neuron axonogenesis / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / response to acetylcholine / cholinergic synapse / acetylcholine-gated channel complex / positive regulation of dopamine secretion / regulation of dopamine metabolic process / negative regulation of action potential / behavioral response to nicotine / acetylcholine-gated monoatomic cation-selective channel activity / inhibitory postsynaptic potential / nervous system process / acetylcholine binding / synaptic transmission, cholinergic / acetylcholine receptor signaling pathway / postsynaptic specialization membrane / regulation of synapse assembly / regulation of dendrite morphogenesis / heterocyclic compound binding / regulation of dopamine secretion / plasma membrane raft / action potential / B cell activation / associative learning / membrane depolarization / social behavior / ligand-gated monoatomic ion channel activity / smooth muscle contraction / monoatomic ion transport / positive regulation of B cell proliferation / sensory perception of pain / visual perception / regulation of membrane potential / learning / response to cocaine / locomotory behavior / response to nicotine / sensory perception of sound / visual learning / memory / cognition / calcium ion transport / presynaptic membrane / chemical synaptic transmission / postsynaptic membrane / response to ethanol / response to oxidative stress / response to hypoxia / neuron projection / external side of plasma membrane / DNA repair / neuronal cell body / dendrite / synapse / protein-containing complex binding / signal transduction / membrane / plasma membrane 類似検索 - 分子機能 | ||||||||||||
生物種 | Homo sapiens (ヒト) / Mus musculus (ハツカネズミ) | ||||||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.4 Å | ||||||||||||
データ登録者 | Kang G / Hibbs RE | ||||||||||||
資金援助 | 米国, 3件
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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. | ||||||||||||
履歴 |
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-構造の表示
添付画像 |
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-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_40753.map.gz | 11.1 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-40753-v30.xml emd-40753.xml | 21.8 KB 21.8 KB | 表示 表示 | EMDBヘッダ |
FSC (解像度算出) | emd_40753_fsc.xml | 10.6 KB | 表示 | FSCデータファイル |
画像 | emd_40753.png | 442.3 KB | ||
Filedesc metadata | emd-40753.cif.gz | 7.2 KB | ||
その他 | emd_40753_half_map_1.map.gz emd_40753_half_map_2.map.gz | 80.5 MB 80.5 MB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-40753 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-40753 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_40753_validation.pdf.gz | 761.8 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_40753_full_validation.pdf.gz | 761.3 KB | 表示 | |
XML形式データ | emd_40753_validation.xml.gz | 17.9 KB | 表示 | |
CIF形式データ | emd_40753_validation.cif.gz | 23.7 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-40753 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-40753 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_40753.map.gz / 形式: CCP4 / 大きさ: 103 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.079 Å | ||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
-ハーフマップ: #1
ファイル | emd_40753_half_map_1.map | ||||||||||||
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投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: #2
ファイル | emd_40753_half_map_2.map | ||||||||||||
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投影像・断面図 |
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密度ヒストグラム |
-試料の構成要素
+全体 : A complex of three Fab fragments with the 2alpha3beta stoichiomet...
+超分子 #1: A complex of three Fab fragments with the 2alpha3beta stoichiomet...
+分子 #1: Neuronal acetylcholine receptor subunit alpha-4
+分子 #2: Neuronal acetylcholine receptor subunit beta-2
+分子 #3: IgG1 Kappa Light Chain
+分子 #4: IgG1 Heavy Chain
+分子 #6: 2-acetamido-2-deoxy-beta-D-glucopyranose
+分子 #7: ACETYLCHOLINE
+分子 #8: N-OCTANE
+分子 #9: SODIUM ION
+分子 #10: water
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
緩衝液 | pH: 7.4 |
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グリッド | モデル: Quantifoil R1.2/1.3 / 材質: COPPER / 前処理 - タイプ: GLOW DISCHARGE |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK IV |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 平均電子線量: 50.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: OTHER / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2.0 µm / 最小 デフォーカス(公称値): 0.8 µm |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |