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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9iiv | ||||||
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| タイトル | human alpha 7 nicotinic acetylcholine receptor in complex with GAT107 and calcium (open state) | ||||||
要素 | Neuronal acetylcholine receptor subunit alpha-7 | ||||||
キーワード | MEMBRANE PROTEIN / Ligand-gated ion channel / Positive allosteric modulator / Ago-PAM / Allosteric modulation / Calcium potentiation | ||||||
| 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 / chloride channel regulator activity / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity ...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 / chloride channel regulator activity / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity / short-term memory / acetylcholine binding / dendritic spine organization / regulation of amyloid precursor protein catabolic process / acetylcholine receptor signaling pathway / positive regulation of amyloid-beta formation / negative regulation of amyloid-beta formation / response to amyloid-beta / positive regulation of protein metabolic process / modulation of excitatory postsynaptic potential / negative regulation of tumor necrosis factor production / plasma membrane raft / monoatomic ion channel activity / toxic substance binding / monoatomic ion transport / negative regulation of cytokine production involved in inflammatory response / positive regulation of excitatory postsynaptic potential / positive regulation of long-term synaptic potentiation / negative regulation of canonical NF-kappaB signal transduction / response to nicotine / excitatory postsynaptic potential / regulation of membrane potential / synapse organization / cognition / calcium channel activity / 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 / learning or memory / postsynaptic membrane / response to hypoxia / positive regulation of ERK1 and ERK2 cascade / positive regulation of MAPK cascade / neuron projection / postsynapse / positive regulation of cell population proliferation / synapse / dendrite / 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) | ||||||
| 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: 2.89 Å | ||||||
データ登録者 | Liu, S. / Zheng, Y. / Tian, C. | ||||||
| 資金援助 | 1件
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引用 | ジャーナル: Cell Discov / 年: 2025タイトル: Structural basis for allosteric agonism of human α7 nicotinic acetylcholine receptors. 著者: Sanling Liu / Yining Zheng / Haopeng Chen / Xin Li / Qipeng Yan / Wenjun Mu / Yaning Fu / Huan Chen / Hongwei Hou / Lei Liu / Changlin Tian / ![]() 要旨: The α7 nicotinic acetylcholine receptor (nAChR), a pentameric ligand-gated ion channel, plays important roles in cognition, neuroprotection, and anti-inflammation. As a potential drug target, α7 ...The α7 nicotinic acetylcholine receptor (nAChR), a pentameric ligand-gated ion channel, plays important roles in cognition, neuroprotection, and anti-inflammation. As a potential drug target, α7 nAChR has different binding sites for different ligands, particularly agonists and positive allosteric modulators (PAMs). Ago-PAMs can both directly activate and allosterically modulate α7 nAChR. However, the mechanism underlying α7 nAChR modulation by ago-PAM has yet to be fully elucidated. Here, we present cryo-EM structures of α7 nAChR in complex with the ago-PAM GAT107 and Ca in the open and desensitized states, respectively. Our results from both structural comparisons and functional assays suggest an allosteric mechanism underlying GAT107 modulation and calcium potentiation of α7 nAChR, involving local conformational changes in the ECD-TMD coupling region and a global structural rearrangement in the transmembrane domain. This work provides a new mechanism of α7 nAChR gating distinct from that of conventional agonist binding. These findings would aid in drug design and enrich our biophysical understanding of pentameric ligand-gated ion channels. | ||||||
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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
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ダウンロード
| PDBx/mmCIF形式 | 9iiv.cif.gz | 407.5 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9iiv.ent.gz | 304.4 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9iiv.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ii/9iiv ftp://data.pdbj.org/pub/pdb/validation_reports/ii/9iiv | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 60606MC ![]() 9iirC 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 |
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リンク
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集合体
| 登録構造単位 | ![]()
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要素
| #1: タンパク質 | 分子量: 57616.250 Da / 分子数: 5 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CHRNA7, NACHRA7 / 細胞株 (発現宿主): HEK293 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P36544#2: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #3: 糖 | ChemComp-NAG / #4: 化合物 | ChemComp-CA / 研究の焦点であるリガンドがあるか | N | Has protein modification | 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 |
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試料調製
| 構成要素 | 名称: human alpha 7 nicotinic acetylcholine receptor in complex with GAT107 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: 8 |
| 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 |
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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): 1700 nm / 最小 デフォーカス(公称値): 1100 nm |
| 撮影 | 電子線照射量: 54 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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| 3次元再構成 | 解像度: 2.89 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 118309 / 対称性のタイプ: POINT |
| 精密化 | 交差検証法: NONE |
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Homo sapiens (ヒト)
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FIELD EMISSION GUN