- PDB-9vj2: Crystal structure of palytoxin-bound Na+,K+-ATPase in the E2P state -
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基本情報
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データベース: PDB / ID: 9vj2
タイトル
Crystal structure of palytoxin-bound Na+,K+-ATPase in the E2P state
要素
(Sodium/potassium-transporting ATPase subunit ...) x 2
FXYD domain-containing ion transport regulator
キーワード
MEMBRANE PROTEIN / ion pump / P-type ATPase
機能・相同性
機能・相同性情報
Basigin interactions / Ion homeostasis / P-type potassium transmembrane transporter activity / positive regulation of sodium ion export across plasma membrane / Ion transport by P-type ATPases / regulation of monoatomic ion transport / positive regulation of potassium ion import across plasma membrane / P-type sodium:potassium-exchanging transporter activity / sodium:potassium-exchanging ATPase complex / membrane repolarization ...Basigin interactions / Ion homeostasis / P-type potassium transmembrane transporter activity / positive regulation of sodium ion export across plasma membrane / Ion transport by P-type ATPases / regulation of monoatomic ion transport / positive regulation of potassium ion import across plasma membrane / P-type sodium:potassium-exchanging transporter activity / 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 / intracellular sodium ion homeostasis / regulation of calcium ion transmembrane transport / ion channel regulator activity / relaxation of cardiac muscle / regulation of cardiac muscle contraction by calcium ion signaling / positive regulation of sodium ion transmembrane transport / sodium ion transport / organelle membrane / potassium ion import across plasma membrane / intracellular potassium ion homeostasis / ATPase activator activity / lateral plasma membrane / intercalated disc / sperm flagellum / transporter activator activity / ATP metabolic process / 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 / metal ion binding 類似検索 - 分子機能
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: How palytoxin transforms the Na,K pump into a cation channel. 著者: Ryuta Kanai / Naoki Tsunekawa / Flemming Cornelius / Bente Vilsen / Chikashi Toyoshima / 要旨: Palytoxin (PTX), a potent marine toxin, has long been known to transform Na,K-ATPase (NKA), an indispensable ion pump, into a nonselective cation channel. It has been postulated that PTX takes ...Palytoxin (PTX), a potent marine toxin, has long been known to transform Na,K-ATPase (NKA), an indispensable ion pump, into a nonselective cation channel. It has been postulated that PTX takes control of the two gates on either side of a channel-like pore. These gates normally open and close alternately, synchronized with chemical events, never opening simultaneously. A critical question is whether palytoxin takes over the control of the two gates or creates a new pathway. Here, we present structures of NKA with bound palytoxin in three different states. PTX binds to NKA in E2P, occupying the physiological Na exit pathway, similar to istaroxime, a new-generation cardiotonic steroid. Adding Na and ATP/ADP to the NKA·PTX complex induces an open channel traversing the entire membrane alongside the physiological ion pathway. As AlF, a stable transition state analog of phosphate replaces phosphate in the NKA·PTX complex preformed in E2P, the complex appears to undergo the normal reaction cycle from E2P to E1·Na. PTX occupies the space between the transmembrane helices M4 and M6, thereby preventing the closure of the extracellular half of the ion pathway. These structures demonstrate that the architecture of NKA is fundamentally different from "a pore with two gates." Each half of the ion pathway comprises three segments, including a movable component that plays a pivotal role in translocating the bound cations by connecting the constant part to an appropriate inlet. The ion pathway of NKA transforms dynamically, ensuring that the two halves never exist simultaneously.
温度: 288 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 6.2 詳細: 140 mM MgCl2, 25 mM NaCl, 15.4% (w/v) PEG2000MME, 7% (w/v) glycerol, 0.4 mM palytoxin, 1 mM BeCl3, 3.5 mM NaF, 5 mM GSH, 0.1 mM DTT and 1 mg/ml butylhydroxytoluen, 100 mM MES