2ZXE

Crystal structure of the sodium - potassium pump in the E2.2K+.Pi state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report



Literature

Crystal structure of the sodium - potassium pump at 2.4 A resolution

Shinoda, T.Ogawa, H.Cornelius, F.Toyoshima, C.

(2009) Nature 459: 446-450

  • DOI: 10.1038/nature07939
  • Primary Citation of Related Structures:  
    2ZXE

  • PubMed Abstract: 
  • Sodium-potassium ATPase is an ATP-powered ion pump that establishes concentration gradients for Na(+) and K(+) ions across the plasma membrane in all animal cells by pumping Na(+) from the cytoplasm and K(+) from the extracellular medium. Such gradie ...

    Sodium-potassium ATPase is an ATP-powered ion pump that establishes concentration gradients for Na(+) and K(+) ions across the plasma membrane in all animal cells by pumping Na(+) from the cytoplasm and K(+) from the extracellular medium. Such gradients are used in many essential processes, notably for generating action potentials. Na(+), K(+)-ATPase is a member of the P-type ATPases, which include sarcoplasmic reticulum Ca(2+)-ATPase and gastric H(+), K(+)-ATPase, among others, and is the target of cardiac glycosides. Here we describe a crystal structure of this important ion pump, from shark rectal glands, consisting of alpha- and beta-subunits and a regulatory FXYD protein, all of which are highly homologous to human ones. The ATPase was fixed in a state analogous to E2.2K(+).P(i), in which the ATPase has a high affinity for K(+) and still binds P(i), as in the first crystal structure of pig kidney enzyme at 3.5 A resolution. Clearly visualized now at 2.4 A resolution are coordination of K(+) and associated water molecules in the transmembrane binding sites and a phosphate analogue (MgF(4)(2-)) in the phosphorylation site. The crystal structure shows that the beta-subunit has a critical role in K(+) binding (although its involvement has previously been suggested) and explains, at least partially, why the homologous Ca(2+)-ATPase counter-transports H(+) rather than K(+), despite the coordinating residues being almost identical.


    Organizational Affiliation

    Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Na, K-ATPase alpha subunitA1028Squalus acanthiasMutation(s): 0 
Gene Names: atn1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Na,K-ATPase; shark
Find proteins for Q4H132 (Squalus acanthias)
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Go to UniProtKB:  Q4H132
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Na+,K+-ATPase beta subunitB305Squalus acanthiasMutation(s): 0 
Gene Names: atp1b1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Na,K-ATPase; shark
Find proteins for C4IX13 (Squalus acanthias)
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Phospholemman-like proteinG74Squalus acanthiasMutation(s): 0 
Gene Names: fxyd10
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Na,K-ATPase; shark
Find proteins for Q70Q12 (Squalus acanthias)
Explore Q70Q12 
Go to UniProtKB:  Q70Q12
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CLR
Query on CLR

Download CCD File 
A
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
NAG
Query on NAG

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B
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
MF4
Query on MF4

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A
TETRAFLUOROMAGNESATE(2-)
F4 Mg
XVYWAXYEHHUKQW-UHFFFAOYSA-J
 Ligand Interaction
K
Query on K

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A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 223.815α = 90
b = 50.914β = 105.12
c = 163.786γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-05-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary