NMR solution structure of leech peptide HSTX-I

  • Classification: TOXIN
  • Organism(s): Haemadipsa sylvestris
  • Mutation(s): Yes 
  • Membrane Protein: Yes  OPM

  • Deposited: 2020-04-29 Released: 2020-06-24 
  • Deposition Author(s): Schroeder, C.I., McMahon, K.L.
  • Funding Organization(s): Australian Research Council (ARC), National Health and Medical Research Council (NHMRC, Australia)

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Pharmacological activity and NMR solution structure of the leech peptide HSTX-I.

McMahon, K.L.Tay, B.Deuis, J.R.Tanaka, B.S.Peigneur, S.Jin, A.H.Tytgat, J.Waxman, S.G.Dib-Hajj, S.D.Vetter, I.Schroeder, C.I.

(2020) Biochem Pharmacol 181: 114082-114082

  • DOI: https://doi.org/10.1016/j.bcp.2020.114082
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The role of voltage-gated sodium (Na V ) channels in pain perception is indisputable. Of particular interest as targets for the development of pain therapeutics are the tetrodotoxin-resistant isoforms Na V 1.8 and Na V 1.9, based on animal as well as human genetic studies linking these ion channel subtypes to the pathogenesis of pain. However, only a limited number of inhibitors selectively targeting these channels have been reported. HSTX-I is a peptide toxin identified from saliva of the leech Haemadipsa sylvestris. The native 23-residue peptide, stabilised by two disulfide bonds, has been reported to inhibit rat Na V 1.8 and mouse Na V 1.9 with low micromolar activity, and may therefore represent a scaffold for development of novel modulators with activity at human tetrodotoxin-resistant Na V isoforms. We synthetically produced this hydrophobic peptide in high yield using a one-pot oxidation and single step purification and determined the three-dimensional solution structure of HSTX-I using NMR solution spectroscopy. However, in our hands, the synthetic HSTX-I displayed only very modest activity at human Na V 1.8 and Na V 1.9, and lacked analgesic efficacy in a murine model of inflammatory pain.

  • Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HSTX-I24Haemadipsa sylvestrisMutation(s): 1 
Membrane Entity: Yes 
Find proteins for A0A2L1DGG0 (Haemadipsa sylvestris)
Explore A0A2L1DGG0 
Go to UniProtKB:  A0A2L1DGG0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2L1DGG0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaFT160100055
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP1162503
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP1139961

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-24
    Type: Initial release
  • Version 1.1: 2020-10-28
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Database references, Other