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- 基本情報
基本情報
| 登録情報 | データベース: PDB / ID: 8ut1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| タイトル | Alpha7-nicotinic acetylcholine receptor bound to epibatidine | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|  要素 | Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|  キーワード | MEMBRANE PROTEIN / Ion channel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 機能・相同性 |  機能・相同性情報 sensory processing / synaptic transmission involved in micturition / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity / short-term memory ...sensory processing / synaptic transmission involved in micturition / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity / short-term memory / cation channel complex / dendritic spine organization / chloride channel regulator activity / acetylcholine binding / regulation of amyloid precursor protein catabolic process / acetylcholine receptor signaling pathway / neurotransmitter receptor complex / positive regulation of amyloid-beta formation / positive regulation of protein metabolic process / negative regulation of amyloid-beta formation / response to amyloid-beta / ligand-gated ion channel signaling pathway / monoatomic ion channel activity / modulation of excitatory postsynaptic potential / plasma membrane raft / negative regulation of tumor necrosis factor production / positive regulation of excitatory postsynaptic potential / toxic substance binding / monoatomic ion transport / negative regulation of canonical NF-kappaB signal transduction / negative regulation of cytokine production involved in inflammatory response / positive regulation of long-term synaptic potentiation / regulation of membrane potential / excitatory postsynaptic potential / response to nicotine / electron transport chain / synapse organization / calcium channel activity / cognition / memory / intracellular calcium ion homeostasis / positive regulation of angiogenesis / calcium ion transport / transmembrane signaling receptor activity / amyloid-beta binding / monoatomic ion transmembrane transport / chemical synaptic transmission / postsynaptic membrane / learning or memory / periplasmic space / response to hypoxia / electron transfer activity / positive regulation of ERK1 and ERK2 cascade / postsynapse / neuron projection / positive regulation of MAPK cascade / iron ion binding / positive regulation of cell population proliferation / heme binding / dendrite / synapse / endoplasmic reticulum membrane / signal transduction / protein homodimerization activity / membrane / plasma membrane 類似検索 - 分子機能 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 生物種 |  Homo sapiens (ヒト)   Escherichia coli (大腸菌) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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: 2.3 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|  データ登録者 | Burke, S.M. / Hibbs, R.E. / Noviello, C.M. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 資金援助 |  米国, 1件 
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|  引用 |  ジャーナル: Cell / 年: 2024 タイトル: Structural mechanisms of α7 nicotinic receptor allosteric modulation and activation. 著者: Sean M Burke / Mariia Avstrikova / Colleen M Noviello / Nuriya Mukhtasimova / Jean-Pierre Changeux / Ganesh A Thakur / Steven M Sine / Marco Cecchini / Ryan E Hibbs /    要旨: The α7 nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel that plays an important role in cholinergic signaling throughout the nervous system. Its unique physiological ...The α7 nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel that plays an important role in cholinergic signaling throughout the nervous system. Its unique physiological characteristics and implications in neurological disorders and inflammation make it a promising but challenging therapeutic target. Positive allosteric modulators overcome limitations of traditional α7 agonists, but their potentiation mechanisms remain unclear. Here, we present high-resolution structures of α7-modulator complexes, revealing partially overlapping binding sites but varying conformational states. Structure-guided functional and computational tests suggest that differences in modulator activity arise from the stable rotation of a channel gating residue out of the pore. We extend the study using a time-resolved cryoelectron microscopy (cryo-EM) approach to reveal asymmetric state transitions for this homomeric channel and also find that a modulator with allosteric agonist activity exploits a distinct channel-gating mechanism. These results define mechanisms of α7 allosteric modulation and activation with implications across the pentameric receptor superfamily. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 履歴 | 
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- 構造の表示
構造の表示
| 構造ビューア | 分子:  Molmil  Jmol/JSmol | 
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- ダウンロードとリンク
ダウンロードとリンク
- ダウンロード
ダウンロード
| PDBx/mmCIF形式 |  8ut1.cif.gz | 727.2 KB | 表示 |  PDBx/mmCIF形式 | 
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| PDB形式 |  pdb8ut1.ent.gz | 619.1 KB | 表示 |  PDB形式 | 
| PDBx/mmJSON形式 |  8ut1.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 |  8ut1_validation.pdf.gz | 2.5 MB | 表示 |  wwPDB検証レポート | 
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| 文書・詳細版 |  8ut1_full_validation.pdf.gz | 2.5 MB | 表示 | |
| XML形式データ |  8ut1_validation.xml.gz | 70 KB | 表示 | |
| CIF形式データ |  8ut1_validation.cif.gz | 100.6 KB | 表示 | |
| アーカイブディレクトリ |  https://data.pdbj.org/pub/pdb/validation_reports/ut/8ut1  ftp://data.pdbj.org/pub/pdb/validation_reports/ut/8ut1 | HTTPS FTP | 
-関連構造データ
| 関連構造データ |  42526MC  8utbC  8uzjC  8v80C  8v82C  8v86C  8v88C  8v89C  8v8aC  8v8cC  8v8dC 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 ( | 
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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
リンク
- 集合体
集合体
| 登録構造単位 |  
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| 1 | 
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- 要素
要素
-タンパク質 , 1種, 5分子 ABCDE    
| #1: タンパク質 | 分子量: 67220.797 Da / 分子数: 5 / 由来タイプ: 組換発現 由来: (組換発現)  Homo sapiens (ヒト), (組換発現)   Escherichia coli (大腸菌) 遺伝子: CHRNA7, NACHRA7, cybC, CHRNA7 / 発現宿主:  Homo sapiens (ヒト) / 参照: UniProt: P36544, UniProt: P0ABE7 | 
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-糖 , 3種, 15分子 
| #2: 多糖 | beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #3: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #5: 糖 | ChemComp-NAG / | 
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-非ポリマー , 5種, 75分子 








| #4: 化合物 | ChemComp-CA / #6: 化合物 | ChemComp-POV / ( #7: 化合物 | ChemComp-9Z9 / ( #8: 化合物 | ChemComp-EPJ / #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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| Has protein modification | Y | 
-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
試料調製
| 構成要素 | 名称: Alpha7-nicotinic acetylcholine receptor bound to epibatidine タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT | 
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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 | 
- 電子顕微鏡撮影
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: FLOOD BEAM | 
| 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: 44 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) | 
- 解析
解析
| EMソフトウェア | 
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| 対称性 | 点対称性: C5 (5回回転対称) | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 2.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 133947 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 拘束条件 | 
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