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基本情報
登録情報 | データベース: PDB / ID: 7yie | ||||||
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タイトル | Human KCNH5-closed state 2 | ||||||
![]() | Potassium voltage-gated channel subfamily H member 5 | ||||||
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機能・相同性 | ![]() Voltage gated Potassium channels / ![]() ![]() ![]() ![]() ![]() ![]() 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | ![]() ![]() ![]() | ||||||
![]() | Zhang, M.F. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Mechanism underlying delayed rectifying in human voltage-mediated activation Eag2 channel. 著者: Mingfeng Zhang / Yuanyue Shan / Duanqing Pei / ![]() 要旨: The transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains ...The transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains unknown at the molecular level. Here, we report six conformations of the human Eag2 (hEag2) ranging from closed, pre-open, open, and pore dilation but non-conducting states captured by cryo-electron microscopy (cryo-EM). These multiple states illuminate dynamics of the selectivity filter and ion permeation pathway with delayed rectifier properties and Cole-Moore effect at the atomic level. Mechanistically, a short S4-S5 linker is coupled with the constrict sites to mediate voltage transducing in a non-domain-swapped configuration, resulting transitions for constrict sites of F464 and Q472 from gating to open state stabilizing for voltage energy transduction. Meanwhile, an additional potassium ion occupied at positions S6 confers the delayed rectifier property and Cole-Moore effects. These results provide insight into voltage transducing and potassium current across membrane, and shed light on the long-sought Cole-Moore effects. #1: ![]() タイトル: Mechanism underlying delayed rectifying in human voltage-mediated activation Eag2 channel. 著者: Mingfeng Zhang / Yuanyue Shan / Duanqing Pei / ![]() 要旨: The transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains ...The transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains unknown at the molecular level. Here, we report six conformations of the human Eag2 (hEag2) ranging from closed, pre-open, open, and pore dilation but non-conducting states captured by cryo-electron microscopy (cryo-EM). These multiple states illuminate dynamics of the selectivity filter and ion permeation pathway with delayed rectifier properties and Cole-Moore effect at the atomic level. Mechanistically, a short S4-S5 linker is coupled with the constrict sites to mediate voltage transducing in a non-domain-swapped configuration, resulting transitions for constrict sites of F464 and Q472 from gating to open state stabilizing for voltage energy transduction. Meanwhile, an additional potassium ion occupied at positions S6 confers the delayed rectifier property and Cole-Moore effects. These results provide insight into voltage transducing and potassium current across membrane, and shed light on the long-sought Cole-Moore effects. | ||||||
履歴 |
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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 | ![]() | 475.5 KB | 表示 | ![]() |
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PDB形式 | ![]() | 383.5 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 | ![]() 33856MC ![]() 7yidC ![]() 7yifC ![]() 7yigC ![]() 7yihC ![]() 7yijC 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: 112011.516 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() ![]() #2: 化合物 | ChemComp-K / #3: 水 | ChemComp-HOH / | ![]() 研究の焦点であるリガンドがあるか | Y | |
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-実験情報
-実験
実験 | 手法: ![]() |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: ![]() |
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試料調製
構成要素 | 名称: human KCNH5 / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.06 MDa / 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 |
緩衝液成分 | 濃度: 150 mM / 名称: sodium chloride![]() ![]() |
試料 | 包埋: NO / シャドウイング: NO / 染色![]() ![]() |
試料支持 | グリッドのタイプ: Quantifoil R1.2/1.3 |
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![]() ![]() |
電子レンズ | モード: BRIGHT FIELD![]() ![]() |
撮影 | 電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.19.2_4158: / 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: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 126938 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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