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基本情報
登録情報 | データベース: PDB / ID: 8qql | |||||||||
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タイトル | Cryo-EM structure of the human inward-rectifier potassium 2.1 channel (Kir2.1) - R312H mutant | |||||||||
![]() | Inward rectifier potassium channel 2 | |||||||||
![]() | MEMBRANE PROTEIN / Ion channel / Potassium Channel / Kir channel | |||||||||
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 / positive regulation of potassium ion transmembrane transport / inward rectifier potassium channel activity / regulation of monoatomic ion transmembrane transport / cardiac muscle cell action potential involved in contraction / intracellular potassium ion homeostasis / regulation of cardiac muscle cell contraction / relaxation of cardiac muscle / potassium ion import across plasma membrane / regulation of heart rate by cardiac conduction / intercalated disc / voltage-gated potassium channel complex / phosphatidylinositol-4,5-bisphosphate binding / potassium ion transmembrane transport / T-tubule / potassium ion transport / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / cellular response to mechanical stimulus / 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 | 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: 6 Å | |||||||||
![]() | Fernandes, C.A.H. / 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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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 222.5 KB | 表示 | ![]() |
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PDB形式 | ![]() | 180.1 KB | 表示 | ![]() |
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その他 | ![]() |
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アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 18595MC 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 ![]() |
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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: 36148.816 Da / 分子数: 4 / 変異: R312H / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() 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 inward-rectifier potassium 2.1 channel (Kir2.1) containing the Andersen-syndrome related mutation R312H タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7.4 詳細: 20 mM Tris-HCl pH 7.4, 150 mM KCl, 1 mM EDTA, 0.59 mM DDM |
緩衝液成分 | 濃度: 20 mM / 名称: Tris(hydroxymethyl)aminomethane hydrochloride / 式: tris-hcl |
試料 | 濃度: 0.6 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: GOLD / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K / 詳細: Blotting force 0, blotting time 3s |
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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: TFS KRIOS 詳細: Preliminary grid screening was performed manually at a Glacios 2 microscope. |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 165000 X / 最大 デフォーカス(公称値): 2400 nm / 最小 デフォーカス(公称値): 1200 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm / アライメント法: BASIC |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 2.35 sec. / 電子線照射量: 40 e/Å2 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 |
電子光学装置 | エネルギーフィルター名称: TFS Selectris X |
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解析
EMソフトウェア |
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 2787753 詳細: A blob picking followed by 2D classification was performed to generate templates for automated template-picking. Initially, 2,787,753 particles were selected after template-picking, which ...詳細: A blob picking followed by 2D classification was performed to generate templates for automated template-picking. Initially, 2,787,753 particles were selected after template-picking, which were submitted to three rounds do 2D classification to remove false picks, ice contamination and classes with unclear features. | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 146539 / クラス平均像の数: 4 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 7zdz Accession code: 7zdz / Chain residue range: 195-367 / Pdb chain residue range: 195-367 / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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