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- PDB-7n3n: CryoEM structure of human NKCC1 state Fu-I -

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Basic information

Entry
Database: PDB / ID: 7n3n
TitleCryoEM structure of human NKCC1 state Fu-I
ComponentsSolute carrier family 12 member 2
KeywordsMEMBRANE PROTEIN / Sodium / potassium / chloride / co-transporter / ions / human / CTD / TMD / full-length / furosemide / diuretic / loop diuretic
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 / transepithelial chloride transport / Cation-coupled Chloride cotransporters / potassium ion transmembrane transporter activity / intracellular chloride ion homeostasis / negative regulation of vascular wound healing / ammonium transmembrane transport / sodium ion homeostasis / ammonium channel activity / chloride ion homeostasis / cell projection membrane / cellular response to potassium ion / T cell chemotaxis / cellular response to chemokine / potassium ion homeostasis / intracellular sodium ion homeostasis / hyperosmotic response / sodium ion import across plasma membrane / intracellular potassium ion homeostasis / cell volume homeostasis / regulation of spontaneous synaptic transmission / gamma-aminobutyric acid signaling pathway / maintenance of blood-brain barrier / potassium ion import across plasma membrane / lateral plasma membrane / transport across blood-brain barrier / monoatomic ion transport / sodium ion transmembrane transport / cytoplasmic vesicle membrane / chloride transmembrane transport / basal plasma membrane / 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 / Amino acid permease/ SLC12A domain / SLC12A transporter family / Amino acid permease
Similarity search - Domain/homology
Chem-FUN / Solute carrier family 12 member 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.33 Å
AuthorsMoseng, M.A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)RO1 AI145069 United States
CitationJournal: Sci Adv / Year: 2022
Title: Inhibition mechanism of NKCC1 involves the carboxyl terminus and long-range conformational coupling.
Authors: Mitchell A Moseng / Chih-Chia Su / Kerri Rios / Meng Cui / Meinan Lyu / Przemyslaw Glaza / Philip A Klenotic / Eric Delpire / Edward W Yu /
Abstract: The Na-K-2Cl cotransporter-1 (NKCC1) is an electroneutral Na-dependent transporter responsible for simultaneously translocating Na, K, and Cl ions into cells. In human tissue, NKCC1 plays a critical ...The Na-K-2Cl cotransporter-1 (NKCC1) is an electroneutral Na-dependent transporter responsible for simultaneously translocating Na, K, and Cl ions into cells. In human tissue, NKCC1 plays a critical role in regulating cytoplasmic volume, fluid intake, chloride homeostasis, and cell polarity. Here, we report four structures of human NKCC1 (hNKCC1), both in the absence and presence of loop diuretic (bumetanide or furosemide), using single-particle cryo-electron microscopy. These structures allow us to directly observe various novel conformations of the hNKCC1 dimer. They also reveal two drug-binding sites located at the transmembrane and cytosolic carboxyl-terminal domains, respectively. Together, our findings enable us to delineate an inhibition mechanism that involves a coupled movement between the cytosolic and transmembrane domains of hNKCC1.
History
DepositionJun 1, 2021Deposition site: RCSB / Processing site: RCSB
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Revision 1.2Apr 19, 2023Group: Structure summary / Category: struct / Item: _struct.title
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Solute carrier family 12 member 2
B: Solute carrier family 12 member 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)263,8284
Polymers263,1672
Non-polymers6612
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Solute carrier family 12 member 2 / Basolateral Na-K-Cl symporter / Bumetanide-sensitive sodium-(potassium)-chloride cotransporter 2


Mass: 131583.422 Da / Num. of mol.: 2 / Fragment: UNP residues 288-1211 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P55011
#2: Chemical ChemComp-FUN / 5-(AMINOSULFONYL)-4-CHLORO-2-[(2-FURYLMETHYL)AMINO]BENZOIC ACID / Furosemide


Mass: 330.744 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C12H11ClN2O5S / Feature type: SUBJECT OF INVESTIGATION / Comment: medication*YM
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: human NKCC1 in a detergent micelle with furosemide / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightValue: 131 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.33 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 264766 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00413315
ELECTRON MICROSCOPYf_angle_d0.68718061
ELECTRON MICROSCOPYf_dihedral_angle_d5.7431780
ELECTRON MICROSCOPYf_chiral_restr0.0472081
ELECTRON MICROSCOPYf_plane_restr0.0062243

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