Solution structure of Pmu1a

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

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Pmu1a, a novel spider toxin with dual inhibitory activity at pain targets hNa V 1.7 and hCa V 3 voltage-gated channels.

Giribaldi, J.Chemin, J.Tuifua, M.Deuis, J.R.Mary, R.Vetter, I.Wilson, D.T.Daly, N.L.Schroeder, C.I.Bourinet, E.Dutertre, S.

(2023) FEBS J 290: 3688-3702

  • DOI: https://doi.org/10.1111/febs.16773
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Venom-derived peptides targeting ion channels involved in pain are regarded as a promising alternative to current, and often ineffective, chronic pain treatments. Many peptide toxins are known to specifically and potently block established therapeutic targets, among which the voltage-gated sodium and calcium channels are major contributors. Here, we report on the discovery and characterization of a novel spider toxin isolated from the crude venom of Pterinochilus murinus that shows inhibitory activity at both hNa V 1.7 and hCa V 3.2 channels, two therapeutic targets implicated in pain pathways. Bioassay-guided HPLC fractionation revealed a 36-amino acid peptide with three disulfide bridges named μ/ω-theraphotoxin-Pmu1a (Pmu1a). Following isolation and characterization, the toxin was chemically synthesized and its biological activity was further assessed using electrophysiology, revealing Pmu1a to be a toxin that potently blocks both hNa V 1.7 and hCa V 3. Nuclear magnetic resonance structure determination of Pmu1a shows an inhibitor cystine knot fold that is the characteristic of many spider peptides. Combined, these data show the potential of Pmu1a as a basis for the design of compounds with dual activity at the therapeutically relevant hCa V 3.2 and hNa V 1.7 voltage-gated channels.

  • Organizational Affiliation

    IBMM, CNRS, ENSCM, Université de Montpellier, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pmu1a toxin36Pterinochilus murinusMutation(s): 0 
Find proteins for P0DQZ2 (Pterinochilus murinus)
Explore P0DQZ2 
Go to UniProtKB:  P0DQZ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DQZ2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not fundedAustralia--

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-29
    Type: Initial release
  • Version 1.1: 2023-08-02
    Changes: Database references