1WXN

Solution structure of APETx2, a specific peptide inhibitor of ASIC3 proton-gated channels


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy, structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Solution structure of APETx2, a specific peptide inhibitor of ASIC3 proton-gated channels

Chagot, B.Escoubas, P.Diochot, S.Bernard, C.Lazdunski, M.Darbon, H.

(2005) Protein Sci 14: 2003-2010

  • DOI: 10.1110/ps.051378905
  • Primary Citation of Related Structures:  
    1WXN

  • PubMed Abstract: 
  • Acid-sensing ion channels (ASIC) are proton-gated sodium channels that have been implicated in pain transduction associated with acidosis in inflamed or ischemic tissues. APETx2, a peptide toxin effector of ASIC3, has been purified from an extract of the sea anemone Anthopleura elegantissima ...

    Acid-sensing ion channels (ASIC) are proton-gated sodium channels that have been implicated in pain transduction associated with acidosis in inflamed or ischemic tissues. APETx2, a peptide toxin effector of ASIC3, has been purified from an extract of the sea anemone Anthopleura elegantissima. APETx2 is a 42-amino-acid peptide cross-linked by three disulfide bridges. Its three-dimensional structure, as determined by conventional two-dimensional 1H-NMR, consists of a compact disulfide-bonded core composed of a four-stranded beta-sheet. It belongs to the disulfide-rich all-beta structural family encompassing peptide toxins commonly found in animal venoms. The structural characteristics of APETx2 are compared with that of PcTx1, another effector of ASIC channels but specific to the ASIC1a subtype and to APETx1, a toxin structurally related to APETx2, which targets the HERG potassium channel. Structural comparisons, coupled with the analysis of the electrostatic characteristics of these various ion channel effectors, led us to suggest a putative channel interaction surface for APETx2, encompassing its N terminus together with the type I-beta turn connecting beta-strands III and IV. This basic surface (R31 and R17) is also rich in aromatic residues (Y16, F15, Y32, and F33). An additional region made of the type II'-beta turn connecting beta-strands I and II could also play a role in the specificity observed for these different ion effectors.


    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, Centre National de le Recherche Scientifique, Unité Mixte de Recherche 6098, Universités d'Aix-Marseille I and II, Marseille Cedex 20, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toxin APETx2A42Anthopleura elegantissimaMutation(s): 0 
UniProt
Find proteins for P61542 (Anthopleura elegantissima)
Explore P61542 
Go to UniProtKB:  P61542
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy, structures with the least restraint violations 
  • OLDERADO: 1WXN Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-16
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance