3S3W

Structure of chicken acid-sensing ion channel 1 at 2.6 a resolution and ph 7.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structure of the Acid-sensing ion channel 1 in complex with the gating modifier Psalmotoxin 1.

Dawson, R.J.Benz, J.Stohler, P.Tetaz, T.Joseph, C.Huber, S.Schmid, G.Hugin, D.Pflimlin, P.Trube, G.Rudolph, M.G.Hennig, M.Ruf, A.

(2012) Nat Commun 3: 936-936

  • DOI: 10.1038/ncomms1917
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Venom-derived peptide toxins can modify the gating characteristics of excitatory channels in neurons. How they bind and interfere with the flow of ions without directly blocking the ion permeation pathway remains elusive. Here we report the crystal s ...

    Venom-derived peptide toxins can modify the gating characteristics of excitatory channels in neurons. How they bind and interfere with the flow of ions without directly blocking the ion permeation pathway remains elusive. Here we report the crystal structure of the trimeric chicken Acid-sensing ion channel 1 in complex with the highly selective gating modifier Psalmotoxin 1 at 3.0 Å resolution. The structure reveals the molecular interactions of three toxin molecules binding at the proton-sensitive acidic pockets of Acid-sensing ion channel 1 and electron density consistent with a cation trapped in the central vestibule above the ion pathway. A hydrophobic patch and a basic cluster are the key structural elements of Psalmotoxin 1 binding, locking two separate regulatory regions in their relative, desensitized-like arrangement. Our results provide a general concept for gating modifier toxin binding suggesting that both surface motifs are required to modify the gating characteristics of an ion channel.


    Organizational Affiliation

    F. Hoffmann-La Roche AG, pRED, Pharma Research & Early Development, Discovery Technologies, Grenzacherstrasse 124, Basel CH4070, Switzerland. roger.dawson@roche.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Amiloride-sensitive cation channel 2, neuronal
A, B, C
459Gallus gallusMutation(s): 0 
Gene Names: ASIC1 (ACCN2)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
ASIC1 Acid-Sensing Ion Channel (ΔASIC1; N- and C-term deletions)
Find proteins for Q1XA76 (Gallus gallus)
Go to Gene View: ASIC1
Go to UniProtKB:  Q1XA76
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 110.469α = 90.00
b = 142.689β = 90.00
c = 159.736γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
SADABSdata scaling
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2012-06-06
    Type: Structure summary
  • Version 1.2: 2012-07-18
    Type: Database references
  • Version 1.3: 2015-05-27
    Type: Refinement description
  • Version 1.4: 2017-11-08
    Type: Refinement description