+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7tj9 | ||||||
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タイトル | Cryo-EM structure of the human Nax channel in complex with beta3 solved in GDN | ||||||
要素 | (Sodium channel ...) x 2 | ||||||
キーワード | TRANSPORT PROTEIN / Sodium Channel / NaV / Ion Channel | ||||||
機能・相同性 | 機能・相同性情報 regulation of sodium ion transmembrane transporter activity / SA node cell action potential / regulation of ventricular cardiac muscle cell membrane depolarization / sodium ion homeostasis / voltage-gated sodium channel activity involved in cardiac muscle cell action potential / atrial cardiac muscle cell action potential / voltage-gated monoatomic ion channel activity / regulation of atrial cardiac muscle cell membrane depolarization / membrane depolarization during cardiac muscle cell action potential / positive regulation of sodium ion transport ...regulation of sodium ion transmembrane transporter activity / SA node cell action potential / regulation of ventricular cardiac muscle cell membrane depolarization / sodium ion homeostasis / voltage-gated sodium channel activity involved in cardiac muscle cell action potential / atrial cardiac muscle cell action potential / voltage-gated monoatomic ion channel activity / regulation of atrial cardiac muscle cell membrane depolarization / membrane depolarization during cardiac muscle cell action potential / positive regulation of sodium ion transport / sodium channel inhibitor activity / ventricular cardiac muscle cell action potential / membrane depolarization during action potential / voltage-gated sodium channel complex / cardiac muscle cell action potential involved in contraction / cellular homeostasis / regulation of monoatomic ion transmembrane transport / Interaction between L1 and Ankyrins / voltage-gated sodium channel activity / positive regulation of heart rate / sodium ion transport / Phase 0 - rapid depolarisation / regulation of heart rate by cardiac conduction / membrane depolarization / glial cell projection / neuronal action potential / sodium channel regulator activity / sodium ion transmembrane transport / cardiac muscle contraction / muscle contraction / protein localization to plasma membrane / response to bacterium / Z disc / nervous system development / transmembrane transporter binding / axon / 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: 2.9 Å | ||||||
データ登録者 | Noland, C.L. / Kschonsak, M. / Ciferri, C. / Payandeh, J. | ||||||
資金援助 | 1件
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引用 | ジャーナル: Nat Commun / 年: 2022 タイトル: Structure-guided unlocking of Na reveals a non-selective tetrodotoxin-sensitive cation channel. 著者: Cameron L Noland / Han Chow Chua / Marc Kschonsak / Stephanie Andrea Heusser / Nina Braun / Timothy Chang / Christine Tam / Jia Tang / Christopher P Arthur / Claudio Ciferri / Stephan ...著者: Cameron L Noland / Han Chow Chua / Marc Kschonsak / Stephanie Andrea Heusser / Nina Braun / Timothy Chang / Christine Tam / Jia Tang / Christopher P Arthur / Claudio Ciferri / Stephan Alexander Pless / Jian Payandeh / 要旨: Unlike classical voltage-gated sodium (Na) channels, Na has been characterized as a voltage-insensitive, tetrodotoxin-resistant, sodium (Na)-activated channel involved in regulating Na homeostasis. ...Unlike classical voltage-gated sodium (Na) channels, Na has been characterized as a voltage-insensitive, tetrodotoxin-resistant, sodium (Na)-activated channel involved in regulating Na homeostasis. However, Na remains refractory to functional characterization in traditional heterologous systems. Here, to gain insight into its atypical physiology, we determine structures of the human Na channel in complex with the auxiliary β3-subunit. Na reveals structural alterations within the selectivity filter, voltage sensor-like domains, and pore module. We do not identify an extracellular Na-sensor or any evidence for a Na-based activation mechanism in Na. Instead, the S6-gate remains closed, membrane lipids fill the central cavity, and the domain III-IV linker restricts S6-dilation. We use protein engineering to identify three pore-wetting mutations targeting the hydrophobic S6-gate that unlock a robust voltage-insensitive leak conductance. This constitutively active Na-QTT channel construct is non-selective among monovalent cations, inhibited by extracellular calcium, and sensitive to classical Na channel blockers, including tetrodotoxin. Our findings highlight a functional diversity across the Na channel scaffold, reshape our understanding of Na physiology, and provide a template to demystify recalcitrant ion channels. | ||||||
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 | 7tj9.cif.gz | 276.7 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7tj9.ent.gz | 205.5 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7tj9.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 | 7tj9_validation.pdf.gz | 1.6 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7tj9_full_validation.pdf.gz | 1.6 MB | 表示 | |
XML形式データ | 7tj9_validation.xml.gz | 46.5 KB | 表示 | |
CIF形式データ | 7tj9_validation.cif.gz | 66.6 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/tj/7tj9 ftp://data.pdbj.org/pub/pdb/validation_reports/tj/7tj9 | HTTPS FTP |
-関連構造データ
関連構造データ | 25920MC 7tj8C 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
-Sodium channel ... , 2種, 2分子 AB
#1: タンパク質 | 分子量: 199684.469 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: SCN7A, SCN6A / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: Q01118 |
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#2: タンパク質 | 分子量: 24723.209 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: SCN3B, KIAA1158 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: Q9NY72 |
-糖 , 2種, 6分子
#3: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose |
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#7: 糖 | ChemComp-NAG / |
-非ポリマー , 5種, 17分子
#4: 化合物 | #5: 化合物 | #6: 化合物 | ChemComp-PLM / #8: 化合物 | #9: 化合物 | ChemComp-Q7G / | |
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-詳細
研究の焦点であるリガンドがあるか | N |
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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
構成要素 | 名称: Complex between human Nax and the Beta3 auxiliary subunit タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
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 |
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
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): 1500 nm / 最小 デフォーカス(公称値): 500 nm |
撮影 | 電子線照射量: 1.067 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.18.2_3874: / 分類: 精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 1420422 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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