3UKM

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.273 

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Ligand Structure Quality Assessment 


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Literature

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

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

(2012) Science 335: 432-436

  • DOI: https://doi.org/10.1126/science.1213274
  • Primary Citation of Related Structures:  
    3UKM

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium channel subfamily K member 1
A, B, C, D
280Homo sapiensMutation(s): 3 
Gene Names: HOHO1K2P1 (TWIK-1)KCNK1KCNO1TWIK1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O00180 (Homo sapiens)
Explore O00180 
Go to UniProtKB:  O00180
PHAROS:  O00180
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00180
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UND
Query on UND

Download Ideal Coordinates CCD File 
E [auth A],
K [auth B],
L [auth C],
R [auth D]
UNDECANE
C11 H24
RSJKGSCJYJTIGS-UHFFFAOYSA-N
K
Query on K

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
I [auth A]
J [auth A]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
M [auth C],
N [auth C],
O [auth C],
P [auth C],
Q [auth C]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.273 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.08α = 90
b = 123.171β = 94.91
c = 119.305γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
CNSrefinement
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

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