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基本情報
登録情報 | ![]() | |||||||||
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タイトル | Cryo-EM structure of the human inward-rectifier potassium 2.1 channel (Kir2.1) - R312H mutant | |||||||||
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![]() | Ion channel / Potassium Channel / Kir channel / MEMBRANE PROTEIN | |||||||||
機能・相同性 | ![]() Sensory perception of sour taste / Classical Kir channels / regulation of skeletal muscle contraction via regulation of action potential / relaxation of skeletal muscle / voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization / magnesium ion transport / membrane repolarization during action potential / Phase 4 - resting membrane potential / membrane repolarization during cardiac muscle cell action potential / regulation of membrane repolarization ...Sensory perception of sour taste / Classical Kir channels / regulation of skeletal muscle contraction via regulation of action potential / relaxation of skeletal muscle / voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization / magnesium ion transport / membrane repolarization during action potential / Phase 4 - resting membrane potential / membrane repolarization during cardiac muscle cell action potential / regulation of membrane repolarization / membrane depolarization during cardiac muscle cell action potential / regulation of resting membrane potential / regulation of monoatomic ion transmembrane transport / positive regulation of potassium ion transmembrane transport / inward rectifier potassium channel activity / cardiac muscle cell action potential involved in contraction / regulation of cardiac muscle cell contraction / relaxation of cardiac muscle / potassium ion import across plasma membrane / regulation of heart rate by cardiac conduction / intracellular potassium ion homeostasis / intercalated disc / phosphatidylinositol-4,5-bisphosphate binding / voltage-gated potassium channel complex / potassium ion transmembrane transport / T-tubule / cellular response to mechanical stimulus / potassium ion transport / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / protein homotetramerization / dendritic spine / postsynaptic membrane / neuronal cell body / glutamatergic synapse / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 6.0 Å | |||||||||
![]() | Fernandes CAH / Zuniga D / Venien-Bryan C | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Biochemical, biophysical, and structural investigations of two mutants (C154Y and R312H) of the human Kir2.1 channel involved in the Andersen-Tawil syndrome. 著者: Dania Zuniga / Andreas Zoumpoulakis / Rafael F Veloso / Laurie Peverini / Sophie Shi / Alexandre Pozza / Valérie Kugler / Françoise Bonneté / Tahar Bouceba / Renaud Wagner / Pierre-Jean ...著者: Dania Zuniga / Andreas Zoumpoulakis / Rafael F Veloso / Laurie Peverini / Sophie Shi / Alexandre Pozza / Valérie Kugler / Françoise Bonneté / Tahar Bouceba / Renaud Wagner / Pierre-Jean Corringer / Carlos A H Fernandes / Catherine Vénien-Bryan / ![]() 要旨: Inwardly rectifying potassium (Kir) channels play a pivotal role in physiology by establishing, maintaining, and regulating the resting membrane potential of the cells, particularly contributing to ...Inwardly rectifying potassium (Kir) channels play a pivotal role in physiology by establishing, maintaining, and regulating the resting membrane potential of the cells, particularly contributing to the cellular repolarization of many excitable cells. Dysfunction in Kir2.1 channels is implicated in several chronic and debilitating human diseases for which there are currently no effective treatments. Specifically, Kir2.1-R312H and Kir2.1-C154Y mutations are associated with Andersen-Tawil syndrome (ATS) in humans. We have investigated the impact of these two mutants in the trafficking of the channel to the cell membrane and function in Xenopus laevis oocytes. Despite both mutations being trafficked to the cell membrane at different extents and capable of binding PIP (phosphatidylinositol-4,5-bisphosphate), the main modulator for channel activity, they resulted in defective channels that do not display K current, albeit through different molecular mechanisms. Coexpression studies showed that R312H and C154Y are expressed and associated with the WT subunits. While WT subunits could rescue R312H dysfunction, the presence of a unique C154Y subunit disrupts the function of the entire complex, which is a typical feature of mutations with a dominant-negative effect. Molecular dynamics simulations showed that Kir2.1-C154Y mutation induces a loss in the structural plasticity of the selectivity filter, impairing the K flow. In addition, the cryo-EM structure of the Kir2.1-R312H mutant has been reconstructed. This study identified the molecular mechanisms by which two ATS-causing mutations impact Kir2.1 channel function and provide valuable insights that can guide potential strategies for the development of future therapeutic interventions for ATS. | |||||||||
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その他 | ![]() ![]() ![]() | 73 MB 77.1 MB 77.1 MB | ||
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-検証レポート
文書・要旨 | ![]() | 665.3 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 664.9 KB | 表示 | |
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-関連構造データ
関連構造データ | ![]() 8qqlMC M: このマップから作成された原子モデル 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 ![]() |
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EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
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注釈 | Full map | ||||||||||||||||||||||||||||||||||||
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: 0.73 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
-追加マップ: Sharpened map
ファイル | emd_18595_additional_1.map | ||||||||||||
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注釈 | Sharpened map | ||||||||||||
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密度ヒストグラム |
-ハーフマップ: Half-map
ファイル | emd_18595_half_map_1.map | ||||||||||||
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注釈 | Half-map | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Half-map
ファイル | emd_18595_half_map_2.map | ||||||||||||
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注釈 | Half-map | ||||||||||||
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密度ヒストグラム |
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試料の構成要素
-全体 : Human inward-rectifier potassium 2.1 channel (Kir2.1) containing ...
全体 | 名称: Human inward-rectifier potassium 2.1 channel (Kir2.1) containing the Andersen-syndrome related mutation R312H |
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要素 |
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-超分子 #1: Human inward-rectifier potassium 2.1 channel (Kir2.1) containing ...
超分子 | 名称: Human inward-rectifier potassium 2.1 channel (Kir2.1) containing the Andersen-syndrome related mutation R312H タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 / 含まれる分子: all |
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由来(天然) | 生物種: ![]() |
-分子 #1: Inward rectifier potassium channel 2
分子 | 名称: Inward rectifier potassium channel 2 / タイプ: protein_or_peptide / ID: 1 / コピー数: 4 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 36.148816 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: RFVKKDGHCN VQFINVGEKG QRYLADIFTT CVDIRWRWML VIFCLAFVLS WLFFGCVFWL IALLHGDLDA SKEGKACVSE VNSFTAAFL FSIETQTTIG YGFRCVTDEC PIAVFMVVFQ SIVGCIIDAF IIGAVMAKMA KPKKRNETLV FSHNAVIAMR D GKLCLMWR ...文字列: RFVKKDGHCN VQFINVGEKG QRYLADIFTT CVDIRWRWML VIFCLAFVLS WLFFGCVFWL IALLHGDLDA SKEGKACVSE VNSFTAAFL FSIETQTTIG YGFRCVTDEC PIAVFMVVFQ SIVGCIIDAF IIGAVMAKMA KPKKRNETLV FSHNAVIAMR D GKLCLMWR VGNLRKSHLV EAHVRAQLLK SRITSEGEYI PLDQIDINVG FDSGIDRIFL VSPITIVHEI DEDSPLYDLS KQ DIDNADF EIVVILEGMV EATAMTTQCH SSYLANEILW GHRYEPVLFE EKHYYKVDYS RFHKTYEVPN TPLCSARDLA UniProtKB: Inward rectifier potassium channel 2 |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 0.6 mg/mL |
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緩衝液 | pH: 7.4 / 構成要素 - 濃度: 20.0 mM / 構成要素 - 式: tris-hcl 構成要素 - 名称: Tris(hydroxymethyl)aminomethane hydrochloride 詳細: 20 mM Tris-HCl pH 7.4, 150 mM KCl, 1 mM EDTA, 0.59 mM DDM |
グリッド | モデル: Quantifoil R1.2/1.3 / 材質: GOLD / メッシュ: 200 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: CONTINUOUS / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 25 sec. |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV / 詳細: Blotting force 0, blotting time 3s. |
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電子顕微鏡法
顕微鏡 | TFS KRIOS |
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特殊光学系 | エネルギーフィルター - 名称: TFS Selectris X |
詳細 | Preliminary grid screening was performed manually at a Glacios 2 microscope. |
撮影 | フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 撮影したグリッド数: 1 / 実像数: 10762 / 平均露光時間: 2.35 sec. / 平均電子線量: 40.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | C2レンズ絞り径: 50.0 µm / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 最大 デフォーカス(公称値): 2.4 µm / 最小 デフォーカス(公称値): 1.2 µm / 倍率(公称値): 165000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER ホルダー冷却材: NITROGEN |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |