7AIP

Structure of Human Potassium Chloride Transporter KCC1 in NaCl (Reference Map)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.12 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 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 4A, B1,074Homo sapiensMutation(s): 0 
Gene Names: SLC12A4KCC1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UP95 (Homo sapiens)
Explore Q9UP95 
Go to UniProtKB:  Q9UP95
PHAROS:  Q9UP95
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UP95
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,
E [auth J]
3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseD [auth F],
F [auth M]
2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP (Subject of Investigation/LOI)
Query on ATP

Download Ideal Coordinates CCD File 
G [auth A],
I [auth B]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
H [auth A],
J [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A, B L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.12 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-02
    Type: Initial release
  • Version 1.1: 2021-06-09
    Changes: Database references
  • Version 1.2: 2021-07-28
    Changes: Database references