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

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


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: https://doi.org/10.1038/ncomms1917
  • Primary Citation of Related Structures:  
    3S3W, 3S3X

  • 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 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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amiloride-sensitive cation channel 2, neuronal
A, B, C
459Gallus gallusMutation(s): 0 
Gene Names: ACCN2ASIC1
Membrane Entity: Yes 
Find proteins for Q1XA76 (Gallus gallus)
Explore Q1XA76 
Go to UniProtKB:  Q1XA76
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1XA76
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
D, E, F
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.469α = 90
b = 142.689β = 90
c = 159.736γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SADABSdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2012-06-06
    Changes: Structure summary
  • Version 1.2: 2012-07-18
    Changes: Database references
  • Version 1.3: 2015-05-27
    Changes: Refinement description
  • Version 1.4: 2017-11-08
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 2.1: 2023-09-13
    Changes: Data collection, Database references, Refinement description, Structure summary