+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8st2 | ||||||||||||
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タイトル | The 3alpha2beta stoichiometry of human alpha4beta2 nicotinic acetylcholine receptor in complex with acetylcholine | ||||||||||||
要素 |
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キーワード | TRANSPORT PROTEIN / cys-loop ligand-gated pentameric ion channels / cation-selective channel / acetylcholine | ||||||||||||
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 / negative regulation of action potential / positive regulation of dopamine secretion / regulation of dopamine metabolic process / behavioral response to nicotine / acetylcholine-gated monoatomic cation-selective channel activity / inhibitory postsynaptic potential / nervous system process / synaptic transmission, cholinergic / acetylcholine binding / acetylcholine receptor signaling pathway / postsynaptic specialization membrane / heterocyclic compound binding / regulation of synapse assembly / regulation of dendrite morphogenesis / action potential / regulation of dopamine secretion / plasma membrane raft / 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 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.94 Å | ||||||||||||
データ登録者 | Kang, G. / Hibbs, R.E. | ||||||||||||
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
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8st2.cif.gz | 1 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8st2.ent.gz | 873.4 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8st2.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 8st2_validation.pdf.gz | 1.4 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8st2_full_validation.pdf.gz | 1.4 MB | 表示 | |
XML形式データ | 8st2_validation.xml.gz | 80.7 KB | 表示 | |
CIF形式データ | 8st2_validation.cif.gz | 124.2 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/st/8st2 ftp://data.pdbj.org/pub/pdb/validation_reports/st/8st2 | HTTPS FTP |
-関連構造データ
関連構造データ | 40755MC 8sszC 8st0C 8st1C 8st3C 8st4C M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 (文献) |
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類似構造データ | 類似検索 - 機能・相同性F&H 検索 |
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
-Neuronal acetylcholine receptor subunit ... , 2種, 5分子 ABDCE
#1: タンパク質 | 分子量: 44862.367 Da / 分子数: 3 / 断片: UNP residues 27-364,582-627 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CHRNA4, NACRA4 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P43681 #2: タンパク質 | 分子量: 46748.863 Da / 分子数: 2 / 断片: UNP residues 26-355,442-502 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CHRNB2 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P17787 |
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-抗体 , 2種, 4分子 FJGK
#3: 抗体 | 分子量: 26378.596 Da / 分子数: 2 / 由来タイプ: 天然 / 由来: (天然) Mus musculus (ハツカネズミ) #4: 抗体 | 分子量: 51195.668 Da / 分子数: 2 / 由来タイプ: 天然 / 由来: (天然) Mus musculus (ハツカネズミ) |
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-糖 , 2種, 11分子
#5: 多糖 | #6: 糖 | ChemComp-NAG / |
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-非ポリマー , 3種, 12分子
#7: 化合物 | #8: 化合物 | ChemComp-NA / | #9: 水 | ChemComp-HOH / | |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: A complex of two Fab fragments with the 3alpha2beta stoichiometry of human alpha4beta2 nicotinic receptor bound to acetylcholine タイプ: COMPLEX / Entity ID: #1-#4 / 由来: MULTIPLE SOURCES |
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由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Homo sapiens (ヒト) |
緩衝液 | pH: 7.4 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE / 湿度: 100 % |
-電子顕微鏡撮影
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: OTHER |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 800 nm |
撮影 | 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
-解析
EMソフトウェア | 名称: PHENIX / バージョン: 1.20.1_4487 / カテゴリ: モデル精密化 |
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CTF補正 | タイプ: NONE |
3次元再構成 | 解像度: 2.94 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 56216 / 対称性のタイプ: POINT |