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-Structure paper
| タイトル | Structural basis for human NKCC1 inhibition by loop diuretic drugs. |
|---|---|
| ジャーナル・号・ページ | EMBO J, Vol. 44, Issue 5, Page 1540-1562, Year 2025 |
| 掲載日 | 2025年1月28日 |
著者 | Yongxiang Zhao / Pietro Vidossich / Biff Forbush / Junfeng Ma / Jesse Rinehart / Marco De Vivo / Erhu Cao / ![]() |
| PubMed 要旨 | Na-K-Cl cotransporters functions as an anion importers, regulating trans-epithelial chloride secretion, cell volume, and renal salt reabsorption. Loop diuretics, including furosemide, bumetanide, and ...Na-K-Cl cotransporters functions as an anion importers, regulating trans-epithelial chloride secretion, cell volume, and renal salt reabsorption. Loop diuretics, including furosemide, bumetanide, and torsemide, antagonize both NKCC1 and NKCC2, and are first-line medicines for the treatment of edema and hypertension. NKCC1 activation by the molecular crowding sensing WNK kinases is critical if cells are to combat shrinkage during hypertonic stress; however, how phosphorylation accelerates NKCC1 ion transport remains unclear. Here, we present co-structures of phospho-activated NKCC1 bound with furosemide, bumetanide, or torsemide showing that furosemide and bumetanide utilize a carboxyl group to coordinate and co-occlude a K, whereas torsemide encroaches and expels the K from the site. We also found that an amino-terminal segment of NKCC1, once phosphorylated, interacts with the carboxyl-terminal domain, and together, they engage with intracellular ion exit and appear to be poised to facilitate rapid ion translocation. Together, these findings enhance our understanding of NKCC-mediated epithelial ion transport and the molecular mechanisms of its inhibition by loop diuretics. |
リンク | EMBO J / PubMed:39875725 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.5 - 2.7 Å |
| 構造データ | EMDB-45081, PDB-9c0e: EMDB-45083, PDB-9c0g: EMDB-45084, PDB-9c0h: |
| 化合物 | ![]() ChemComp-ATP: ![]() ChemComp-FUN: ![]() ChemComp-K: ![]() ChemComp-CL: ![]() ChemComp-NA: ![]() ChemComp-MG: ![]() PDB-1atu: ![]() ChemComp-HOH: ![]() ChemComp-82U: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Sodium potassium chloride cotransporter / phosphorylation / outward-open state / furosemide / outward-open / torsemide / bumetanide |
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