- EMDB-71540: Human OCTN2 bound to carnitine in the occluded conformation -
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基本情報
登録情報
データベース: EMDB / ID: EMD-71540
タイトル
Human OCTN2 bound to carnitine in the occluded conformation
マップデータ
Primary unsharpened map. Has strong density for the ligands of interest, carnitine and Na . Density for modelled water molecules require sharpened map (available as an auxiliary map).
試料
細胞器官・細胞要素: Novel organic cation transport 2 (OCTN2;SLC22A5) bound to carnitine in the occluded conformation.
National Health and Medical Research Council (NHMRC, Australia)
APP2016308
オーストラリア
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Structural basis of sodium ion-dependent carnitine transport by OCTN2. 著者: James S Davies / Yi C Zeng / Chelsea Briot / Simon H J Brown / Renae M Ryan / Alastair G Stewart / 要旨: Carnitine is essential for the import of long-chain fatty acids into mitochondria, where they are used for energy production. The carnitine transporter OCTN2 (novel organic cation transporter 2, ...Carnitine is essential for the import of long-chain fatty acids into mitochondria, where they are used for energy production. The carnitine transporter OCTN2 (novel organic cation transporter 2, SLC22A5) mediates carnitine uptake across the plasma membrane and as such facilitates fatty acid metabolism in most tissues. OCTN2 dysfunction causes systemic primary carnitine deficiency (SPCD), a potentially lethal disorder. Despite its importance in metabolism, the mechanism of high-affinity, sodium ion-dependent transport by OCTN2 is unclear. Here we report cryo-EM structures of human OCTN2 in three conformations: inward-facing ligand-free, occluded carnitine- and Na-bound, and inward-facing ipratropium-bound. These structures define key interactions responsible for carnitine transport and identify an allosterically coupled Na binding site housed within an aqueous cavity, separate from the carnitine-binding site. Combined with electrophysiology data, we provide a framework for understanding variants associated with SPCD and insight into how OCTN2 functions as the primary human carnitine transporter.
ダウンロード / ファイル: emd_71540.map.gz / 形式: CCP4 / 大きさ: 125 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Primary unsharpened map. Has strong density for the ligands of interest, carnitine and Na . Density for modelled water molecules require sharpened map (available as an auxiliary map).