EMD-45084

Single-particle
2.5 Å
EMD-45084 Deposition: 25/05/2024
Map released: 12/02/2025
Last modified: 19/02/2025
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links

EMD-45084

Phosphorylated human NKCC1 in complex with bumetanide

EMD-45084

Single-particle
2.5 Å
EMD-45084 Deposition: 25/05/2024
Map released: 12/02/2025
Last modified: 19/02/2025
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Sample Organism: Homo sapiens
Sample: Phosphorylated human NKCC1 in complex with bumetanide
Fitted models: 9c0h (Avg. Q-score: 0.602)
Raw data: EMPIAR-12539

Deposition Authors: Zhao YX, Cao EH
Structural basis for human NKCC1 inhibition by loop diuretic drugs.
PUBMED: 39875725
DOI: doi:10.1038/s44318-025-00368-6
ISSN: 1460-2075
ASTM: EMJODG
Abstract:
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.