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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8sgi | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of human NCX1 in complex with SEA0400 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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![]() | TRANSPORT PROTEIN / Na/Ca exchanger / sodium calcium exchanger | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() relaxation of smooth muscle / calcium:sodium antiporter activity / vascular associated smooth muscle contraction / regulation of cell communication by electrical coupling / negative regulation of protein serine/threonine kinase activity / calcium ion export / membrane depolarization during cardiac muscle cell action potential / sodium ion export across plasma membrane / regulation of the force of heart contraction / cell communication by electrical coupling involved in cardiac conduction ...relaxation of smooth muscle / calcium:sodium antiporter activity / vascular associated smooth muscle contraction / regulation of cell communication by electrical coupling / negative regulation of protein serine/threonine kinase activity / calcium ion export / membrane depolarization during cardiac muscle cell action potential / sodium ion export across plasma membrane / regulation of the force of heart contraction / cell communication by electrical coupling involved in cardiac conduction / intracellular sodium ion homeostasis / sodium ion import across plasma membrane / calcium ion import / calcium ion transport into cytosol / Sodium/Calcium exchangers / cardiac muscle cell development / regulation of cardiac muscle contraction by calcium ion signaling / Reduction of cytosolic Ca++ levels / ankyrin binding / relaxation of cardiac muscle / calcium ion transmembrane import into cytosol / negative regulation of cytosolic calcium ion concentration / cellular response to caffeine / positive regulation of the force of heart contraction / calcium ion import across plasma membrane / intercalated disc / regulation of cardiac conduction / positive regulation of bone mineralization / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / calcium ion homeostasis / Ion homeostasis / cytoskeletal protein binding / monoatomic ion transport / cardiac muscle contraction / muscle contraction / axon terminus / response to muscle stretch / T-tubule / sodium ion transmembrane transport / regulation of heart rate / cell periphery / cellular response to reactive oxygen species / sarcolemma / calcium ion transmembrane transport / Z disc / intracellular calcium ion homeostasis / regulation of gene expression / transmembrane transporter binding / postsynapse / calmodulin binding / postsynaptic density / axon / neuronal cell body / synapse / dendrite / calcium ion binding / nucleoplasm / 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: 2.9 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | Xue, J. / Jiang, Y. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural mechanisms of PIP activation and SEA0400 inhibition in human cardiac sodium-calcium exchanger NCX1. 著者: Jing Xue / Weizhong Zeng / Scott John / Nicole Attiq / Michela Ottolia / Youxing Jiang / ![]() 要旨: Na/Ca exchangers (NCXs) transport Ca across the plasma membrane in exchange for Na and play a vital role in maintaining cellular Ca homeostasis. Our previous structural study of human cardiac NCX1 ...Na/Ca exchangers (NCXs) transport Ca across the plasma membrane in exchange for Na and play a vital role in maintaining cellular Ca homeostasis. Our previous structural study of human cardiac NCX1 (HsNCX1) reveals the overall architecture of the eukaryotic exchanger and the formation of the inactivation assembly by the intracellular regulatory domain that underlies the cytosolic Na-dependent inactivation and Ca activation of NCX1. Here, we present the cryo-EM structures of HsNCX1 in complex with a physiological activator phosphatidylinositol 4,5-bisphosphate (PIP), or pharmacological inhibitor SEA0400, that enhances the inactivation of the exchanger. We demonstrate that PIP binding stimulates NCX1 activity by inducing a conformational change at the interface between the transmembrane (TM) and cytosolic domains that destabilizes the inactivation assembly. In contrast, SEA0400 binding in the TM domain of NCX1 stabilizes the exchanger in an inward-facing conformation that facilitates the formation of the inactivation assembly, thereby promoting the Na-dependent inactivation of NCX1. Thus, this study reveals the structural basis of PIP activation and SEA0400 inhibition of NCX1 and provides some mechanistic understandings of cellular regulation and pharmacology of NCX family proteins. #1: ジャーナル: bioRxiv / 年: 2025 タイトル: Structural mechanisms of PIP activation and SEA0400 inhibition in human cardiac sodium-calcium exchanger NCX1. 著者: Jing Xue / Weizhong Zeng / Scott John / Nicole Attiq / Michela Ottolia / Youxing Jiang / ![]() 要旨: Na/Ca exchangers (NCXs) transport Ca across the plasma membrane in exchange for Na and play a vital role in maintaining cellular Ca homeostasis. Our previous structural study of human cardiac NCX1 ...Na/Ca exchangers (NCXs) transport Ca across the plasma membrane in exchange for Na and play a vital role in maintaining cellular Ca homeostasis. Our previous structural study of human cardiac NCX1 (HsNCX1) reveals the overall architecture of the eukaryotic exchanger and the formation of the inactivation assembly by the intracellular regulatory domain that underlies the cytosolic Na-dependent inactivation and Ca activation of NCX1. Here we present the cryo-EM structures of HsNCX1 in complex with a physiological activator phosphatidylinositol 4,5-bisphosphate (PIP), or pharmacological inhibitor SEA0400 that enhances the inactivation of the exchanger. We demonstrate that PIP binding stimulates NCX1 activity by inducing a conformational change at the interface between the TM and cytosolic domains that destabilizes the inactivation assembly. In contrast, SEA0400 binding in the TM domain of NCX1 stabilizes the exchanger in an inward-facing conformation that facilitates the formation of the inactivation assembly, thereby promoting the Na-dependent inactivation of NCX1. Thus, this study reveals the structural basis of PIP activation and SEA0400 inhibition of NCX1 and provides some mechanistic understandings of cellular regulation and pharmacology of NCX family proteins. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 198.1 KB | 表示 | ![]() |
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PDB形式 | ![]() | 146.5 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
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 | ![]() 40456MC ![]() 9iv8C 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
-タンパク質 , 1種, 1分子 A
#1: タンパク質 | 分子量: 109181.070 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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-抗体 , 2種, 2分子 LH
#2: 抗体 | 分子量: 21740.082 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#3: 抗体 | 分子量: 26435.598 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
-非ポリマー , 4種, 11分子 






#4: 化合物 | ChemComp-EKY / | ||||
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#5: 化合物 | ChemComp-CA / #6: 化合物 | #7: 水 | ChemComp-HOH / | |
-詳細
研究の焦点であるリガンドがあるか | Y |
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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 |
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試料調製
構成要素 |
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由来(天然) |
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由来(組換発現) | 生物種: ![]() | ||||||||||||||||||||||||
緩衝液 | pH: 7.4 | ||||||||||||||||||||||||
試料 | 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: 300 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 |
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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): 2000 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 60 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (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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EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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: 368227 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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