3UKM

Crystal structure of the human two pore domain potassium ion channel K2P1 (TWIK-1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.273 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structure of the human two-pore domain potassium channel K2P1.

Miller, A.N.Long, S.B.

(2012) Science 335: 432-436

  • DOI: 10.1126/science.1213274

  • PubMed Abstract: 
  • Two-pore domain potassium (K(+)) channels (K2P channels) control the negative resting potential of eukaryotic cells and regulate cell excitability by conducting K(+) ions across the plasma membrane. Here, we present the 3.4 angstrom resolution crysta ...

    Two-pore domain potassium (K(+)) channels (K2P channels) control the negative resting potential of eukaryotic cells and regulate cell excitability by conducting K(+) ions across the plasma membrane. Here, we present the 3.4 angstrom resolution crystal structure of a human K2P channel, K2P1 (TWIK-1). Unlike other K(+) channel structures, K2P1 is dimeric. An extracellular cap domain located above the selectivity filter forms an ion pathway in which K(+) ions flow through side portals. Openings within the transmembrane region expose the pore to the lipid bilayer and are filled with electron density attributable to alkyl chains. An interfacial helix appears structurally poised to affect gating. The structure lays a foundation to further investigate how K2P channels are regulated by diverse stimuli.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium channel subfamily K member 1
A, B, C, D
280Homo sapiensMutation(s): 3 
Gene Names: KCNK1 (HOHO1, KCNO1, TWIK1)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Two-Pore Domain Potassium Channel K2P1.1 (TWIK-1)
Find proteins for O00180 (Homo sapiens)
Go to Gene View: KCNK1
Go to UniProtKB:  O00180
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A, C
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
UND
Query on UND

Download SDF File 
Download CCD File 
A, B, C, D
UNDECANE
LIPID FRAGMENT
C11 H24
RSJKGSCJYJTIGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.273 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 82.080α = 90.00
b = 123.171β = 94.91
c = 119.305γ = 90.00
Software Package:
Software NamePurpose
CBASSdata collection
CNSrefinement
HKL-3000data scaling
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-08
    Type: Initial release