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基本情報
登録情報 | データベース: PDB / ID: 7ukh | ||||||
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タイトル | Human Kv4.2-KChIP2-DPP6 channel complex in an open state, intracellular region | ||||||
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![]() | MEMBRANE PROTEIN / potassium channel complex | ||||||
機能・相同性 | ![]() ER retention sequence binding / regulation of potassium ion export across plasma membrane / Kv4.2-KChIP2 channel complex / A-type (transient outward) potassium channel activity / Phase 1 - inactivation of fast Na+ channels / positive regulation of potassium ion export across plasma membrane / clustering of voltage-gated potassium channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / membrane repolarization during cardiac muscle cell action potential / membrane repolarization ...ER retention sequence binding / regulation of potassium ion export across plasma membrane / Kv4.2-KChIP2 channel complex / A-type (transient outward) potassium channel activity / Phase 1 - inactivation of fast Na+ channels / positive regulation of potassium ion export across plasma membrane / clustering of voltage-gated potassium channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / membrane repolarization during cardiac muscle cell action potential / membrane repolarization / regulation of membrane repolarization / Voltage gated Potassium channels / regulation of potassium ion transmembrane transport / anchoring junction / neuronal cell body membrane / postsynaptic specialization membrane / regulation of heart contraction / locomotor rhythm / action potential / plasma membrane raft / voltage-gated potassium channel activity / potassium channel activity / detection of calcium ion / regulation of signal transduction / potassium channel regulator activity / neuronal action potential / muscle contraction / voltage-gated potassium channel complex / sensory perception of pain / potassium ion transmembrane transport / GABA-ergic synapse / potassium ion transport / protein homooligomerization / chemical synaptic transmission / cellular response to hypoxia / dendritic spine / perikaryon / transmembrane transporter binding / postsynaptic membrane / neuronal cell body / synapse / dendrite / calcium ion binding / protein-containing complex binding / glutamatergic synapse / signal transduction / metal ion binding / identical protein binding / plasma membrane / cytoplasm 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: 2.33 Å | ||||||
![]() | Zhao, H. / Dai, Y. / Lee, C.H. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Activation and closed-state inactivation mechanisms of the human voltage-gated K4 channel complexes. 著者: Wenlei Ye / Hongtu Zhao / Yaxin Dai / Yingdi Wang / Yu-Hua Lo / Lily Yeh Jan / Chia-Hsueh Lee / ![]() 要旨: The voltage-gated ion channel activity depends on both activation (transition from the resting state to the open state) and inactivation. Inactivation is a self-restraint mechanism to limit ion ...The voltage-gated ion channel activity depends on both activation (transition from the resting state to the open state) and inactivation. Inactivation is a self-restraint mechanism to limit ion conduction and is as crucial to membrane excitability as activation. Inactivation can occur when the channel is open or closed. Although open-state inactivation is well understood, the molecular basis of closed-state inactivation has remained elusive. We report cryo-EM structures of human K4.2 channel complexes in inactivated, open, and closed states. Closed-state inactivation of K4 involves an unprecedented symmetry breakdown for pore closure by only two of the four S4-S5 linkers, distinct from known mechanisms of open-state inactivation. We further capture K4 in a putative resting state, revealing how voltage sensor movements control the pore. Moreover, our structures provide insights regarding channel modulation by KChIP2 and DPP6 auxiliary subunits. Our findings elucidate mechanisms of closed-state inactivation and voltage-dependent activation of the K4 channel. | ||||||
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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 | ![]() | 299.3 KB | 表示 | ![]() |
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PDB形式 | ![]() | 232.5 KB | 表示 | ![]() |
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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 | ![]() 26581MC ![]() 7uk5C ![]() 7ukcC ![]() 7ukdC ![]() 7ukeC ![]() 7ukfC ![]() 7ukgC 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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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 59049.332 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: タンパク質 | 分子量: 28975.486 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #3: 化合物 | ChemComp-ZN / #4: 化合物 | ChemComp-CA / 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: 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 Kv4.2-KChIP2-DPP6 channel complex in an open state, intracellular region 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: ![]() |
由来(組換発現) | 生物種: ![]() |
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: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1600 nm / 最小 デフォーカス(公称値): 600 nm |
撮影 | 電子線照射量: 85.9 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: NONE |
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3次元再構成 | 解像度: 2.33 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 278343 / 対称性のタイプ: POINT |