4RUF

Human K2P4.1 (TRAAAK) potassium channel, W262S mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.299 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Transmembrane Helix Straightening and Buckling Underlies Activation of Mechanosensitive and Thermosensitive K2P Channels.

Lolicato, M.Riegelhaupt, P.M.Arrigoni, C.Clark, K.A.Minor, D.L.

(2014) Neuron 84: 1198-1212

  • DOI: 10.1016/j.neuron.2014.11.017
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Mechanical and thermal activation of ion channels is central to touch, thermosensation, and pain. The TRAAK/TREK K(2P) potassium channel subfamily produces background currents that alter neuronal excitability in response to pressure, temperature, sig ...

    Mechanical and thermal activation of ion channels is central to touch, thermosensation, and pain. The TRAAK/TREK K(2P) potassium channel subfamily produces background currents that alter neuronal excitability in response to pressure, temperature, signaling lipids, and anesthetics. How such diverse stimuli control channel function is unclear. Here we report structures of K(2P)4.1 (TRAAK) bearing C-type gate-activating mutations that reveal a tilting and straightening of the M4 inner transmembrane helix and a buckling of the M2 transmembrane helix. These conformational changes move M4 in a direction opposite to that in classical potassium channel activation mechanisms and open a passage lateral to the pore that faces the lipid bilayer inner leaflet. Together, our findings uncover a unique aspect of K(2P) modulation, indicate a means for how the K(2P) C-terminal cytoplasmic domain affects the C-type gate which lies ∼40Å away, and suggest how lipids and bilayer inner leaflet deformations may gate the channel.


    Organizational Affiliation

    Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California 93858-2330, USA; Departments of Biochemistry and Biophysics, and Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, California 93858-2330, USA; California Institute for Quantitative Biomedical Research, University of California, San Francisco, San Francisco, California 93858-2330, USA; Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Electronic address: daniel.minor@ucsf.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium channel subfamily K member 4
A, B
309Homo sapiensMutation(s): 3 
Gene Names: KCNK4TRAAK
Find proteins for Q9NYG8 (Homo sapiens)
Go to UniProtKB:  Q9NYG8
NIH Common Fund Data Resources
PHAROS  Q9NYG8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download CCD File 
A, B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.299 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.053α = 90
b = 127.982β = 90
c = 130.406γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-17
    Type: Initial release
  • Version 1.1: 2015-01-07
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Refinement description