Solution Structure of Psmalmotoxin 1, the First Characterized Specific Blocker of ASIC1a NA+ channel

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Recombinant production and solution structure of PcTx1, the specific peptide inhibitor of ASIC1a proton-gated cation channels

Escoubas, P.Bernard, C.Lambeau, G.Lazdunski, M.Darbon, H.

(2003) Protein Sci 12: 1332-1343

  • DOI: https://doi.org/10.1110/ps.0307003
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Acid-sensing ion channels (ASICs) are thought to be important ion channels, particularly for the perception of pain. Some of them may also contribute to synaptic plasticity, learning, and memory. Psalmotoxin 1 (PcTx1), the first potent and specific blocker of the ASIC1a proton-sensing channel, has been successfully expressed in the Drosophila melanogaster S2 cell recombinant expression system used here for the first time to produce a spider toxin. The recombinant toxin was identical in all respects to the native peptide, and its three-dimensional structure in solution was determined by means of (1)H 2D NMR spectroscopy. Surface characteristics of PcTx1 provide insights on key structural elements involved in the binding of PcTx1 to ASIC1a channels. They appear to be localized in the beta-sheet and the beta-turn linking the strands, as indicated by electrostatic anisotropy calculations, surface charge distribution, and the presence of residues known to be implicated in channel recognition by other inhibitor cystine knot (ICK) toxins.

  • Organizational Affiliation

    Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), CNRS UMR 6097, Sophia-Antipolis, 06560 Valbonne, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Psalmotoxin 140Psalmopoeus cambridgeiMutation(s): 0 
Find proteins for P60514 (Psalmopoeus cambridgei)
Explore P60514 
Go to UniProtKB:  P60514
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60514
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations