- PDB-8jbk: Crystal structure of Na+,K+-ATPase in the E1.3Na+ state -
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データベース: PDB / ID: 8jbk
タイトル
Crystal structure of Na+,K+-ATPase in the E1.3Na+ 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 / 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:potassium-exchanging ATPase complex ...Basigin interactions / Ion homeostasis / P-type potassium transmembrane transporter activity / 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: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 / sodium ion transport / organelle membrane / potassium ion import across plasma membrane / ATPase activator activity / sperm flagellum / intercalated disc / lateral plasma membrane / 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: FEBS Lett / 年: 2023 タイトル: Crystal structures of Na ,K -ATPase reveal the mechanism that converts the K -bound form to Na -bound form and opens and closes the cytoplasmic gate. 著者: Ryuta Kanai / Bente Vilsen / Flemming Cornelius / Chikashi Toyoshima / 要旨: Na ,K -ATPase (NKA) plays a pivotal role in establishing electrochemical gradients for Na and K across the cell membrane by alternating between the E1 (showing high affinity for Na and low affinity ...Na ,K -ATPase (NKA) plays a pivotal role in establishing electrochemical gradients for Na and K across the cell membrane by alternating between the E1 (showing high affinity for Na and low affinity for K ) and E2 (low affinity to Na and high affinity to K ) forms. Presented here are two crystal structures of NKA in E1·Mg and E1·3Na states at 2.9 and 2.8 Å resolution, respectively. These two E1 structures fill a gap in our description of the NKA reaction cycle based on the atomic structures. We describe how NKA converts the K -bound E2·2K form to an E1 (E1·Mg ) form, which allows high-affinity Na binding, eventually closing the cytoplasmic gate (in E1 ~ P·ADP·3Na ) after binding three Na , while keeping the extracellular ion pathway sealed. We now understand previously unknown functional roles for several parts of NKA and that NKA uses even the lipid bilayer for gating the ion pathway.
温度: 283 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 6.2 詳細: 285 mM NaCl, 25 mM MgCl2, 15.4% (w/v) PEG2000MME, 7% (w/v) glycerol, 5 mM GSH, 0.1 mM DTT and 1 mg/ml butylhydroxytoluen, 100 mM MES