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- EMDB-45083: Phosphorylated human NKCC1 in complex with torsemide -

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Basic information

Entry
Database: EMDB / ID: EMD-45083
TitlePhosphorylated human NKCC1 in complex with torsemide
Map dataPhosphorylated human NKCC1 in complex with torsemide
Sample
  • Complex: Phosphorylated human NKCC1 in complex with torsemide
    • Protein or peptide: Solute carrier family 12 member 2
  • Ligand: 4-(3-methylanilino)-N-[(propan-2-yl)carbamoyl]pyridine-3-sulfonamide
  • Ligand: CHLORIDE ION
  • Ligand: SODIUM ION
  • Ligand: water
KeywordsPhosphorylation / sodium potassium chloride cotransporter / outward-open / torsemide / TRANSPORT PROTEIN
Function / homology
Function and homology information


positive regulation of cell volume / positive regulation of aspartate secretion / transepithelial ammonium transport / regulation of matrix metallopeptidase secretion / cell body membrane / metal ion transmembrane transporter activity / inorganic anion import across plasma membrane / inorganic cation import across plasma membrane / chloride:monoatomic cation symporter activity / sodium:potassium:chloride symporter activity ...positive regulation of cell volume / positive regulation of aspartate secretion / transepithelial ammonium transport / regulation of matrix metallopeptidase secretion / cell body membrane / metal ion transmembrane transporter activity / inorganic anion import across plasma membrane / inorganic cation import across plasma membrane / chloride:monoatomic cation symporter activity / sodium:potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / potassium ion transmembrane transporter activity / transepithelial chloride transport / intracellular chloride ion homeostasis / ammonium transmembrane transport / negative regulation of vascular wound healing / sodium ion homeostasis / ammonium channel activity / chloride ion homeostasis / cell projection membrane / cellular response to chemokine / T cell chemotaxis / potassium ion homeostasis / intracellular sodium ion homeostasis / sodium ion import across plasma membrane / cell volume homeostasis / cellular response to potassium ion / hyperosmotic response / regulation of spontaneous synaptic transmission / gamma-aminobutyric acid signaling pathway / maintenance of blood-brain barrier / potassium ion import across plasma membrane / intracellular potassium ion homeostasis / lateral plasma membrane / transport across blood-brain barrier / monoatomic ion transport / sodium ion transmembrane transport / basal plasma membrane / cytoplasmic vesicle membrane / chloride transmembrane transport / cell periphery / cell projection / Hsp90 protein binding / extracellular vesicle / protein-folding chaperone binding / cell body / basolateral plasma membrane / neuron projection / apical plasma membrane / neuronal cell body / protein kinase binding / extracellular exosome / membrane / plasma membrane
Similarity search - Function
Solute carrier family 12 member 1/2 / Solute carrier family 12 member 2 / Amino acid permease, N-terminal / Amino acid permease N-terminal / SLC12A transporter, C-terminal / Solute carrier family 12 / SLC12A transporter family / Amino acid permease/ SLC12A domain / Amino acid permease
Similarity search - Domain/homology
Solute carrier family 12 member 2
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsZhao YX / Cao EH
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)5R01DK128592 United States
CitationJournal: EMBO J / Year: 2025
Title: Structural basis for human NKCC1 inhibition by loop diuretic drugs.
Authors: Yongxiang Zhao / Pietro Vidossich / Biff Forbush / Junfeng Ma / Jesse Rinehart / Marco De Vivo / Erhu Cao /
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 ...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.
History
DepositionMay 25, 2024-
Header (metadata) releaseFeb 12, 2025-
Map releaseFeb 12, 2025-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45083.png

Downloads & links

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Map

FileDownload / File: emd_45083.map.gz / Format: CCP4 / Size: 209.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPhosphorylated human NKCC1 in complex with torsemide
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
0.83 Å/pix.
x 380 pix.
= 315.4 Å		0.83 Å/pix.
x 380 pix.
= 315.4 Å		0.83 Å/pix.
x 380 pix.
= 315.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.13
Minimum - Maximum-0.49868938 - 0.8691817
Average (Standard dev.)0.00039441336 (±0.019529337)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions380380380
Spacing380380380
CellA=B=C: 315.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: Additional Map

Fileemd_45083_additional_1.map
AnnotationAdditional Map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: Half Map B

Fileemd_45083_half_map_1.map
AnnotationHalf Map B
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half Map A

Fileemd_45083_half_map_2.map
AnnotationHalf Map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Phosphorylated human NKCC1 in complex with torsemide

EntireName: Phosphorylated human NKCC1 in complex with torsemide
Components
  • Complex: Phosphorylated human NKCC1 in complex with torsemide
    • Protein or peptide: Solute carrier family 12 member 2
  • Ligand: 4-(3-methylanilino)-N-[(propan-2-yl)carbamoyl]pyridine-3-sulfonamide
  • Ligand: CHLORIDE ION
  • Ligand: SODIUM ION
  • Ligand: water

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Supramolecule #1: Phosphorylated human NKCC1 in complex with torsemide

SupramoleculeName: Phosphorylated human NKCC1 in complex with torsemide / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Solute carrier family 12 member 2

MacromoleculeName: Solute carrier family 12 member 2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 131.663406 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MEPRPTAPSS GAPGLAGVGE TPSAAALAAA RVELPGTAVP SVPEDAAPAS RDGGGVRDEG PAAAGDGLGR PLGPTPSQSR FQVDLVSEN AGRAAAAAAA AAAAAAAAGA GAGAKQTPAD GEASGESEPA KGSEEAKGRF RVNFVDPAAS SSAEDSLSDA A GVGVDGPN ...String:
MEPRPTAPSS GAPGLAGVGE TPSAAALAAA RVELPGTAVP SVPEDAAPAS RDGGGVRDEG PAAAGDGLGR PLGPTPSQSR FQVDLVSEN AGRAAAAAAA AAAAAAAAGA GAGAKQTPAD GEASGESEPA KGSEEAKGRF RVNFVDPAAS SSAEDSLSDA A GVGVDGPN VSFQNGGDTV LSEGSSLHSG GGGGSGHHQH YYYDTHTNTY YLRTFGHN(TPO)M DAVPRIDHYR HTAAQLGE K LLRPSLAELH DELEKEPFED GFANGEESTP TRDAVVTYTA ESKGVVKFGW IKGVLVRCML NIWGVMLFIR LSWIVGQAG IGLSVLVIMM ATVVTTITGL STSAIATNGF VRGGGAYYLI SRSLGPEFGG AIGLIFAFAN AVAVAMYVVG FAETVVELLK EHSILMIDE INDIRIIGAI TVVILLGISV AGMEWEAKAQ IVLLVILLLA IGDFVIGTFI PLESKKPKGF FGYKSEIFNE N FGPDFREE ETFFSVFAIF FPAATGILAG ANISGDLADP QSAIPKGTLL AILITTLVYV GIAVSVGSCV VRDATGNVND TI VTELTNC TSAACKLNFD FSSCESSPCS YGLMNNFQVM SMVSGFTPLI SAGIFSATLS SALASLVSAP KIFQALCKDN IYP AFQMFA KGYGKNNEPL RGYILTFLIA LGFILIAELN VIAPIISNFF LASYALINFS VFHASLAKSP GWRPAFKYYN MWIS LLGAI LCCIVMFVIN WWAALLTYVI VLGLYIYVTY KKPDVNWGSS TQALTYLNAL QHSIRLSGVE DHVKNFRPQC LVMTG APNS RPALLHLVHD FTKNVGLMIC GHVHMGPRRQ AMKEMSIDQA KYQRWLIKNK MKAFYAPVHA DDLREGAQYL MQAAGL GRM KPNTLVLGFK KDWLQADMRD VDMYINLFHD AFDIQYGVVV IRLKEGLDIS HLQGQEELLS SQEKSPGTKD VVVSVEY SK KSDLDTSKPL SEKPITHKVE EEDGKTATQP LLKKESKGPI VPLNVADQKL LEASTQFQKK QGKNTIDVWW LFDDGGLT L LIPYLLTTKK KWKDCKIRVF IGGKINRIDH DRRAMATLLS KFRIDFSDIM VLGDINTKPK KENIIAFEEI IEPYRLHED DKEQDIADKM KEDEPWRITD NELELYKTKT YRQIRLNELL KEHSSTANII VMSLPVARKG AVSSALYMAW LEALSKDLPP ILLVRGNHQ SVLTFYS

UniProtKB: Solute carrier family 12 member 2

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Macromolecule #2: 4-(3-methylanilino)-N-[(propan-2-yl)carbamoyl]pyridine-3-sulfonamide

MacromoleculeName: 4-(3-methylanilino)-N-[(propan-2-yl)carbamoyl]pyridine-3-sulfonamide
type: ligand / ID: 2 / Number of copies: 2 / Formula: A1ATU
Molecular weightTheoretical: 348.42 Da

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Macromolecule #3: CHLORIDE ION

MacromoleculeName: CHLORIDE ION / type: ligand / ID: 3 / Number of copies: 2 / Formula: CL
Molecular weightTheoretical: 35.453 Da

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Macromolecule #4: SODIUM ION

MacromoleculeName: SODIUM ION / type: ligand / ID: 4 / Number of copies: 2
Molecular weightTheoretical: 22.99 Da

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Macromolecule #5: water

MacromoleculeName: water / type: ligand / ID: 5 / Number of copies: 2 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI MORGAGNI
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 42.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.5 µm / Nominal defocus min: 0.7000000000000001 µm

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 2360417
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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