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- PDB-7ngb: Structure of Wild-Type Human Potassium Chloride Transporter KCC3 ... -

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Basic information

Entry
Database: PDB / ID: 7ngb
TitleStructure of Wild-Type Human Potassium Chloride Transporter KCC3 in NaCl (LMNG/CHS)
ComponentsIsoform 2 of Solute carrier family 12 member 6
KeywordsTRANSPORT PROTEIN / CCC / transporter / human membrane protein / homodimer / KCC3 / KCC / potassium-chloride coupled transporter / Structural Genomics / Structural Genomics Consortium / SGC
Function / homology
Function and homology information


Defective SLC12A6 causes agenesis of the corpus callosum, with peripheral neuropathy (ACCPN) / potassium ion transmembrane transporter activity / potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / cellular hypotonic response / cellular hypotonic salinity response / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane ...Defective SLC12A6 causes agenesis of the corpus callosum, with peripheral neuropathy (ACCPN) / potassium ion transmembrane transporter activity / potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / cellular hypotonic response / cellular hypotonic salinity response / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane / monoatomic ion transport / chloride transmembrane transport / potassium ion transmembrane transport / cellular response to glucose stimulus / basolateral plasma membrane / chemical synaptic transmission / angiogenesis / axon / synapse / protein kinase binding / membrane / metal ion binding / plasma membrane
Similarity search - Function
K/Cl co-transporter / SLC12A transporter, C-terminal / Solute carrier family 12 / Amino acid permease/ SLC12A domain / SLC12A transporter family / Amino acid permease
Similarity search - Domain/homology
Solute carrier family 12 member 6
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.64 Å
AuthorsChi, G. / Man, H. / Pike, A.C.W. / Wang, D. / McKinley, G. / Mukhopadhyay, S.M.M. / MacLean, E.M. / Chalk, R. / Moreau, C. / Snee, M. ...Chi, G. / Man, H. / Pike, A.C.W. / Wang, D. / McKinley, G. / Mukhopadhyay, S.M.M. / MacLean, E.M. / Chalk, R. / Moreau, C. / Snee, M. / Abrusci, P. / Arrowsmith, C.H. / Bountra, C. / Edwards, A.M. / Marsden, B.D. / Burgess-Brown, N.A. / Duerr, K.L.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
European Commission United Kingdom
CitationJournal: EMBO J / Year: 2021
Title: Phospho-regulation, nucleotide binding and ion access control in potassium-chloride cotransporters.
Authors: Gamma Chi / Rebecca Ebenhoch / Henry Man / Haiping Tang / Laurence E Tremblay / Gabriella Reggiano / Xingyu Qiu / Tina Bohstedt / Idlir Liko / Fernando G Almeida / Alexandre P Garneau / Dong ...Authors: Gamma Chi / Rebecca Ebenhoch / Henry Man / Haiping Tang / Laurence E Tremblay / Gabriella Reggiano / Xingyu Qiu / Tina Bohstedt / Idlir Liko / Fernando G Almeida / Alexandre P Garneau / Dong Wang / Gavin McKinley / Christophe P Moreau / Kiran D Bountra / Patrizia Abrusci / Shubhashish M M Mukhopadhyay / Alejandra Fernandez-Cid / Samira Slimani / Julie L Lavoie / Nicola A Burgess-Brown / Ben Tehan / Frank DiMaio / Ali Jazayeri / Paul Isenring / Carol V Robinson / Katharina L Dürr /
Abstract: Potassium-coupled chloride transporters (KCCs) play crucial roles in regulating cell volume and intracellular chloride concentration. They are characteristically inhibited under isotonic conditions ...Potassium-coupled chloride transporters (KCCs) play crucial roles in regulating cell volume and intracellular chloride concentration. They are characteristically inhibited under isotonic conditions via phospho-regulatory sites located within the cytoplasmic termini. Decreased inhibitory phosphorylation in response to hypotonic cell swelling stimulates transport activity, and dysfunction of this regulatory process has been associated with various human diseases. Here, we present cryo-EM structures of human KCC3b and KCC1, revealing structural determinants for phospho-regulation in both N- and C-termini. We show that phospho-mimetic KCC3b is arrested in an inward-facing state in which intracellular ion access is blocked by extensive contacts with the N-terminus. In another mutant with increased isotonic transport activity, KCC1Δ19, this interdomain interaction is absent, likely due to a unique phospho-regulatory site in the KCC1 N-terminus. Furthermore, we map additional phosphorylation sites as well as a previously unknown ATP/ADP-binding pocket in the large C-terminal domain and show enhanced thermal stabilization of other CCCs by adenine nucleotides. These findings provide fundamentally new insights into the complex regulation of KCCs and may unlock innovative strategies for drug development.
History
DepositionFeb 9, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 9, 2021Provider: repository / Type: Initial release
Revision 1.1Jul 28, 2021Group: Database references / Category: citation / Item: _citation.journal_volume
Revision 1.2Oct 16, 2024Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_admin / pdbx_entity_branch_descriptor / pdbx_entry_details / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

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Assembly

Deposited unit
A: Isoform 2 of Solute carrier family 12 member 6
B: Isoform 2 of Solute carrier family 12 member 6
hetero molecules


Theoretical massNumber of molelcules
Total (without water)246,0506
Polymers244,4352
Non-polymers1,6164
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area8270 Å2
ΔGint-2 kcal/mol
Surface area73380 Å2

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Components

#1: Protein Isoform 2 of Solute carrier family 12 member 6 / Electroneutral potassium-chloride cotransporter 3 / K-Cl cotransporter 3


Mass: 122217.359 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC12A6, KCC3 / Production host: Homo sapiens (human) / References: UniProt: Q9UHW9
#2: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#3: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestN
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: Homodimeric membrane protein complex / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.24 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %

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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 FIELD
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 37.8 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 3155

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.17.1_3660refinement
PHENIX1.17.1_3660refinement
EM softwareName: cryoSPARC / Version: 2 / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.64 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 175990 / Symmetry type: POINT
RefinementCross valid method: NONE

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