4XTL

Crystal structure of the light-driven sodium pump KR2 in the monomeric blue form, pH 4.3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Crystal structure of a light-driven sodium pump.

Gushchin, I.Shevchenko, V.Polovinkin, V.Kovalev, K.Alekseev, A.Round, E.Borshchevskiy, V.Balandin, T.Popov, A.Gensch, T.Fahlke, C.Bamann, C.Willbold, D.Buldt, G.Bamberg, E.Gordeliy, V.

(2015) Nat Struct Mol Biol 22: 390-395

  • DOI: https://doi.org/10.1038/nsmb.3002
  • Primary Citation of Related Structures:  
    4XTL, 4XTN, 4XTO

  • PubMed Abstract: 

    Recently, the first known light-driven sodium pumps, from the microbial rhodopsin family, were discovered. We have solved the structure of one of them, Krokinobacter eikastus rhodopsin 2 (KR2), in the monomeric blue state and in two pentameric red states, at resolutions of 1.45 Å and 2.2 and 2.8 Å, respectively. The structures reveal the ion-translocation pathway and show that the sodium ion is bound outside the protein at the oligomerization interface, that the ion-release cavity is capped by a unique N-terminal α-helix and that the ion-uptake cavity is unexpectedly large and open to the surface. Obstruction of the cavity with the mutation G263F imparts KR2 with the ability to pump potassium. These results pave the way for the understanding and rational design of cation pumps with new specific properties valuable for optogenetics.


  • Organizational Affiliation

    1] Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology, Dolgoprudniy, Russia. [2] Institute of Complex Systems (ICS), ICS-6, Structural Biochemistry, Research Center Jülich, Jülich, Germany. [3] Institute of Crystallography, University of Aachen (RWTH), Aachen, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sodium pumping rhodopsin288Dokdonia eikastaMutation(s): 0 
Gene Names: NaR
Membrane Entity: Yes 
UniProt
Find proteins for N0DKS8 (Dokdonia eikasta)
Explore N0DKS8 
Go to UniProtKB:  N0DKS8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupN0DKS8
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LFA
Query on LFA

Download Ideal Coordinates CCD File 
AA [auth A]
BA [auth A]
C [auth A]
CA [auth A]
D [auth A]
AA [auth A],
BA [auth A],
C [auth A],
CA [auth A],
D [auth A],
DA [auth A],
E [auth A],
EA [auth A],
F [auth A],
FA [auth A],
G [auth A],
GA [auth A],
H [auth A],
HA [auth A],
I [auth A],
IA [auth A],
J [auth A],
JA [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A],
Y [auth A],
Z [auth A]
EICOSANE
C20 H42
CBFCDTFDPHXCNY-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
KA [auth A],
LA [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
B [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
LYR
Query on LYR
A
L-PEPTIDE LINKINGC26 H42 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.18α = 90
b = 80.84β = 90
c = 232.84γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-01
    Type: Initial release
  • Version 1.1: 2015-04-08
    Changes: Database references
  • Version 1.2: 2015-04-22
    Changes: Database references
  • Version 1.3: 2015-04-29
    Changes: Database references
  • Version 1.4: 2015-05-13
    Changes: Database references
  • Version 1.5: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description