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- PDB-6pzt: cryo-EM structure of human NKCC1 -

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Basic information

Entry
Database: PDB / ID: 6pzt
Titlecryo-EM structure of human NKCC1
ComponentsSolute carrier family 12 member 2
KeywordsTRANSPORT PROTEIN / NKCC1
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 / inorganic anion import across plasma membrane / inorganic cation import across plasma membrane / chloride:monoatomic cation symporter activity / sodium:potassium:chloride symporter activity / metal ion transmembrane transporter activity ...positive regulation of cell volume / positive regulation of aspartate secretion / transepithelial ammonium transport / regulation of matrix metallopeptidase secretion / cell body membrane / inorganic anion import across plasma membrane / inorganic cation import across plasma membrane / chloride:monoatomic cation symporter activity / sodium:potassium:chloride symporter activity / metal ion transmembrane transporter activity / transepithelial chloride transport / potassium ion transmembrane transporter activity / Cation-coupled Chloride cotransporters / ammonium transmembrane transport / sodium ion homeostasis / intracellular chloride ion homeostasis / negative regulation of vascular wound healing / chloride ion homeostasis / cellular response to potassium ion / ammonium transmembrane transporter activity / intracellular potassium ion homeostasis / cell projection membrane / sodium ion import across plasma membrane / intracellular sodium ion homeostasis / potassium ion homeostasis / cellular response to chemokine / T cell chemotaxis / hyperosmotic response / gamma-aminobutyric acid signaling pathway / cell volume homeostasis / regulation of spontaneous synaptic transmission / maintenance of blood-brain barrier / potassium ion import across plasma membrane / transport across blood-brain barrier / sodium ion transmembrane transport / lateral plasma membrane / monoatomic ion transport / chloride transmembrane transport / basal plasma membrane / cell projection / cell periphery / Hsp90 protein binding / cytoplasmic vesicle membrane / extracellular vesicle / cell body / protein-folding chaperone binding / 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 family / SLC12A transporter, C-terminal / Solute carrier family 12 / 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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsCao, E. / Wang, Q. / Yang, X.
CitationJournal: Nat Commun / Year: 2020
Title: Structure of the human cation-chloride cotransporter NKCC1 determined by single-particle electron cryo-microscopy.
Authors: Xiaoyong Yang / Qinzhe Wang / Erhu Cao /
Abstract: The secondary active cation-chloride cotransporters (CCCs) utilize the existing Na and/or K gradients to move Cl into or out of cells. NKCC1 is an intensively studied member of the CCC family and ...The secondary active cation-chloride cotransporters (CCCs) utilize the existing Na and/or K gradients to move Cl into or out of cells. NKCC1 is an intensively studied member of the CCC family and plays fundamental roles in regulating trans-epithelial ion movement, cell volume, chloride homeostasis and neuronal excitability. Here, we report a cryo-EM structure of human NKCC1 captured in a partially loaded, inward-open state. NKCC1 assembles into a dimer, with the first ten transmembrane (TM) helices harboring the transport core and TM11-TM12 helices lining the dimer interface. TM1 and TM6 helices break α-helical geometry halfway across the lipid bilayer where ion binding sites are organized around these discontinuous regions. NKCC1 may harbor multiple extracellular entryways and intracellular exits, raising the possibility that K, Na, and Cl ions may traverse along their own routes for translocation. NKCC1 structure provides a blueprint for further probing structure-function relationships of NKCC1 and other CCCs.
History
DepositionAug 1, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 25, 2020Provider: repository / Type: Initial release

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Structure visualization

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)263,3372
Polymers263,3372
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
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: 131668.484 Da / Num. of mol.: 2 / Mutation: K289N, G351R
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC12A2, NKCC1
Production host: Mammalian expression vector BsrGI-MCS-pcDNA3.1 (others)
References: UniProt: P55011

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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 NKCC1Na-K-Cl cotransporter / Type: CELL / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Mammalian expression vector BsrGI-MCS-pcDNA3.1 (others)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
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: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 10 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.15_3459: / Classification: refinement
EM software
IDNameCategory
2SerialEMimage acquisition
4CTFFINDCTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 90803 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0076194
ELECTRON MICROSCOPYf_angle_d0.7058494
ELECTRON MICROSCOPYf_dihedral_angle_d7.1843450
ELECTRON MICROSCOPYf_chiral_restr0.0471016
ELECTRON MICROSCOPYf_plane_restr0.0041104

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