6Y5V

Structure of Human Potassium Chloride Transporter KCC3b (S45D/T940D/T997D) in KCl


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.08 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Phospho-regulation, nucleotide binding and ion access control in potassium-chloride cotransporters.

Chi, G.Ebenhoch, R.Man, H.Tang, H.Tremblay, L.E.Reggiano, G.Qiu, X.Bohstedt, T.Liko, I.Almeida, F.G.Garneau, A.P.Wang, D.McKinley, G.Moreau, C.P.Bountra, K.D.Abrusci, P.Mukhopadhyay, S.M.M.Fernandez-Cid, A.Slimani, S.Lavoie, J.L.Burgess-Brown, N.A.Tehan, B.DiMaio, F.Jazayeri, A.Isenring, P.Robinson, C.V.Durr, K.L.

(2021) EMBO J 40: e107294-e107294

  • DOI: 10.15252/embj.2020107294
  • Primary Citation of Related Structures:  
    6Y5V, 7AIN, 7AIO, 7AIP, 7AIQ, 7AIR, 7NGB

  • PubMed Abstract: 
  • 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 ...

    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.


    Organizational Affiliation

    OMass Therapeutics, Ltd., Oxford, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Solute carrier family 12 member 6A, B1100Homo sapiensMutation(s): 0 
Gene Names: SLC12A6KCC3
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UHW9 (Homo sapiens)
Explore Q9UHW9 
Go to UniProtKB:  Q9UHW9
PHAROS:  Q9UHW9
GTEx:  ENSG00000140199 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UHW9
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC, D 3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A],
F [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.08 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European CommissionUnited Kingdom115766

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-15
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2021-06-09
    Changes: Database references, Structure summary
  • Version 2.2: 2021-07-28
    Changes: Database references