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基本情報
登録情報 | データベース: PDB / ID: 7dsw | ||||||
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タイトル | Structure of a human NHE1-CHP1 complex under pH 7.5 | ||||||
![]() | Sodium/hydrogen exchanger 1 | ||||||
![]() | MEMBRANE PROTEIN / Transporter | ||||||
機能・相同性 | ![]() sodium:proton antiporter activity involved in regulation of cardiac muscle cell membrane potential / cation-transporting ATPase complex / Sodium/Proton exchangers / regulation of the force of heart contraction by cardiac conduction / positive regulation of calcium:sodium antiporter activity / Hyaluronan uptake and degradation / regulation of cardiac muscle cell membrane potential / cellular response to electrical stimulus / potassium:proton antiporter activity / sodium:proton antiporter activity ...sodium:proton antiporter activity involved in regulation of cardiac muscle cell membrane potential / cation-transporting ATPase complex / Sodium/Proton exchangers / regulation of the force of heart contraction by cardiac conduction / positive regulation of calcium:sodium antiporter activity / Hyaluronan uptake and degradation / regulation of cardiac muscle cell membrane potential / cellular response to electrical stimulus / potassium:proton antiporter activity / sodium:proton antiporter activity / positive regulation of action potential / maintenance of cell polarity / positive regulation of calcineurin-NFAT signaling cascade / regulation of pH / sodium ion export across plasma membrane / cardiac muscle cell differentiation / cellular response to acidic pH / sodium ion import across plasma membrane / ion binding / protein phosphatase 2B binding / intracellular sodium ion homeostasis / cardiac muscle cell contraction / response to acidic pH / regulation of stress fiber assembly / regulation of cardiac muscle contraction by calcium ion signaling / positive regulation of mitochondrial membrane permeability / cellular response to cold / cellular response to antibiotic / regulation of focal adhesion assembly / positive regulation of cardiac muscle hypertrophy / positive regulation of the force of heart contraction / cellular response to organic cyclic compound / intercalated disc / monoatomic ion transport / potassium ion transmembrane transport / proton transmembrane transport / T-tubule / cellular response to epinephrine stimulus / response to muscle stretch / phosphatidylinositol-4,5-bisphosphate binding / stem cell differentiation / regulation of intracellular pH / phospholipid binding / cellular response to mechanical stimulus / cellular response to insulin stimulus / calcium-dependent protein binding / cell migration / lamellipodium / protein complex oligomerization / protein-macromolecule adaptor activity / cellular response to hypoxia / positive regulation of cell growth / basolateral plasma membrane / molecular adaptor activity / calmodulin binding / positive regulation of apoptotic process / membrane raft / apical plasma membrane / focal adhesion / negative regulation of apoptotic process / perinuclear region of cytoplasm / cell surface / positive regulation of transcription by RNA polymerase II / mitochondrion / extracellular exosome / nucleoplasm / identical protein binding / membrane / 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: 3.3 Å | ||||||
![]() | Dong, Y. / Gao, Y. / Li, B. / Zhang, X.C. / Zhao, Y. | ||||||
![]() | ![]() タイトル: Structure and mechanism of the human NHE1-CHP1 complex. 著者: Yanli Dong / Yiwei Gao / Alina Ilie / DuSik Kim / Annie Boucher / Bin Li / Xuejun C Zhang / John Orlowski / Yan Zhao / ![]() ![]() 要旨: Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and ...Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and volume homeostasis. Calcineurin B-homologous protein 1 (CHP1) is an obligate binding partner that promotes NHE1 biosynthetic maturation, cell surface expression and pH-sensitivity. Dysfunctions of either protein are associated with neurological disorders. Here, we elucidate structures of the human NHE1-CHP1 complex in both inward- and inhibitor (cariporide)-bound outward-facing conformations. We find that NHE1 assembles as a symmetrical homodimer, with each subunit undergoing an elevator-like conformational change during cation exchange. The cryo-EM map reveals the binding site for the NHE1 inhibitor cariporide, illustrating how inhibitors block transport activity. The CHP1 molecule differentially associates with these two conformational states of each NHE1 monomer, and this association difference probably underlies the regulation of NHE1 pH-sensitivity by CHP1. | ||||||
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構造の表示
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構造ビューア | 分子: ![]() ![]() |
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-検証レポート
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-関連構造データ
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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: 46610.219 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: 化合物 | ChemComp-LBN / 研究の焦点であるリガンドがあるか | N | |
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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 NHE1-CHP1 complex under pH 7.5 / タイプ: COMPLEX 詳細: Calcineurin B homologous protein 1 (CHP1) was not successfully resolved in this map because of conformational heterogeneity. Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.23 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: 6.5 |
試料 | 濃度: 6 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: The NHE1-CHP1 complex was reconstituted into lipid nanodiscs. |
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil |
急速凍結 | 装置: FEI VITROBOT MARK III / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K |
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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 / 倍率(公称値): 13000 X / 最大 デフォーカス(公称値): 2200 nm / 最小 デフォーカス(公称値): 1200 nm / Cs: 2.7 mm / アライメント法: COMA FREE |
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 | 電子線照射量: 60 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 2462 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
画像スキャン | 横: 3838 / 縦: 3710 / 動画フレーム数/画像: 32 / 利用したフレーム数/画像: 1-32 |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 108712 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: AB INITIO MODEL |