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登録情報 | データベース: PDB / ID: 7wys | ||||||||||||
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タイトル | Crystal structures of Na+,K+-ATPase in complex with istaroxime | ||||||||||||
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![]() | MEMBRANE PROTEIN / Na+ / K+-ATPase / ion transport / Cardiotonic steroids | ||||||||||||
機能・相同性 | ![]() Basigin interactions / Ion homeostasis / Na+/K+-exchanging ATPase / positive regulation of sodium ion export across plasma membrane / positive regulation of potassium ion import across plasma membrane / regulation of monoatomic ion transport / Ion transport by P-type ATPases / transporter activator activity / P-type sodium:potassium-exchanging transporter activity / sodium ion binding ...Basigin interactions / Ion homeostasis / Na+/K+-exchanging ATPase / positive regulation of sodium ion export across plasma membrane / positive regulation of potassium ion import across plasma membrane / regulation of monoatomic ion transport / Ion transport by P-type ATPases / transporter activator activity / P-type sodium:potassium-exchanging transporter activity / sodium ion binding / sodium:potassium-exchanging ATPase complex / membrane repolarization / establishment or maintenance of transmembrane electrochemical gradient / sodium ion export across plasma membrane / positive regulation of potassium ion transmembrane transport / regulation of calcium ion transmembrane transport / intracellular sodium ion homeostasis / ion channel regulator activity / intracellular potassium ion homeostasis / regulation of cardiac muscle contraction by calcium ion signaling / relaxation of cardiac muscle / positive regulation of sodium ion transmembrane transport / organelle membrane / potassium ion import across plasma membrane / potassium ion binding / ATPase activator activity / sperm flagellum / intercalated disc / lateral plasma membrane / ATP metabolic process / regulation of sodium ion transport / cardiac muscle contraction / T-tubule / proton transmembrane transport / protein localization to plasma membrane / sarcolemma / transmembrane transport / intracellular calcium ion homeostasis / melanosome / ATPase binding / regulation of gene expression / protein-macromolecule adaptor activity / basolateral plasma membrane / cell adhesion / protein stabilization / apical plasma membrane / axon / innate immune response / protein kinase binding / ATP hydrolysis activity / ATP binding / membrane / plasma membrane 類似検索 - 分子機能 | ||||||||||||
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![]() | Ogawa, H. / Cornelius, F. / Kanai, R. / Motoyama, K. / Vilsen, B. / Toyoshima, C. | ||||||||||||
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![]() | ![]() タイトル: Cryoelectron microscopy of Na,K-ATPase in the two E2P states with and without cardiotonic steroids. 著者: Ryuta Kanai / Flemming Cornelius / Bente Vilsen / Chikashi Toyoshima / ![]() ![]() 要旨: Cryoelectron microscopy (cryo-EM) was applied to Na+,K+-ATPase (NKA) to determine the structures of two E2P states, one (E2PATP) formed by ATP and Mg2+ in the forward reaction, and the other (E2PPi) ...Cryoelectron microscopy (cryo-EM) was applied to Na+,K+-ATPase (NKA) to determine the structures of two E2P states, one (E2PATP) formed by ATP and Mg2+ in the forward reaction, and the other (E2PPi) formed by inorganic phosphate (Pi) and Mg2+ in the backward reaction, with and without ouabain or istaroxime, representatives of classical and new-generation cardiotonic steroids (CTSs). These two E2P states exhibit different biochemical properties. In particular, K+-sensitive acceleration of the dephosphorylation reaction is not observed with E2PPi, attributed to the presence of a Mg2+ ion in the transmembrane cation binding sites. The cryo-EM structures of NKA demonstrate that the two E2P structures are nearly identical but Mg2+ in the transmembrane binding cavity is identified only in E2PPi, corroborating the idea that it should be denoted as E2PPi·Mg2+. We can now explain why the absence of transmembrane Mg2+ in E2PATP confers the K+ sensitivity in dephosphorylation. In addition, we show that ATP bridges the actuator (A) and nucleotide binding (N) domains, stabilizing the E2PATP state; CTS binding causes hardly any changes in the structure of NKA, both in E2PATP and E2PPi·Mg2+, indicating that the binding mechanism is conformational selection; and istaroxime binds to NKA, extending its aminoalkyloxime group deep into the cation binding site. This orientation is upside down compared to that of classical CTSs with respect to the steroid ring. Notably, mobile parts of NKA are resolved substantially better in the electron microscopy (EM) maps than in previous X-ray structures, including sugars sticking out from the β-subunit and many phospholipid molecules. #1: ![]() タイトル: Binding of cardiotonic steroids to Na 著者: Kanai, R. / Cornelius, F. / Ogawa, H. / Motoyama, K. / Vilsen, B. / Toyoshima, C. #2: ![]() タイトル: Cryo-electron microscopy of Na+, K+-ATPase in the two E2P states with and without cardiotonic steroids 著者: Kanai, R. / Cornelius, F. / Vilsen, B. / Toyoshima, C. | ||||||||||||
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