NMR solution structure of Midi peptide designed based on m-conotoxins

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 19 
  • Selection Criteria: structures with the lowest energy 

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Design of bioactive peptides from naturally occurring mu-conotoxin structures.

Stevens, M.Peigneur, S.Dyubankova, N.Lescrinier, E.Herdewijn, P.Tytgat, J.

(2012) J Biol Chem 287: 31382-31392

  • DOI: https://doi.org/10.1074/jbc.M112.375733
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    To date, cone snail toxins ("conotoxins") are of great interest in the pursuit of novel subtype-selective modulators of voltage-gated sodium channels (Na(v)s). Na(v)s participate in a wide range of electrophysiological processes. Consequently, their malfunctioning has been associated with numerous diseases. The development of subtype-selective modulators of Na(v)s remains highly important in the treatment of such disorders. In current research, a series of novel, synthetic, and bioactive compounds were designed based on two naturally occurring μ-conotoxins that target Na(v)s. The initial designed peptide contains solely 13 amino acids and was therefore named "Mini peptide." It was derived from the μ-conotoxins KIIIA and BuIIIC. Based on this Mini peptide, 10 analogues were subsequently developed, comprising 12-16 amino acids with two disulfide bridges. Following appropriate folding and mass verification, blocking effects on Na(v)s were investigated. The most promising compound established an IC(50) of 34.1 ± 0.01 nM (R2-Midi on Na(v)1.2). An NMR structure of one of our most promising compounds was determined. Surprisingly, this structure does not reveal an α-helix. We prove that it is possible to design small peptides based on known pharmacophores of μ-conotoxins without losing their potency and selectivity. These data can provide crucial material for further development of conotoxin-based therapeutics.

  • Organizational Affiliation

    Laboratory of Toxicology, Katholieke Universiteit (KU) Leuven, Campus Gasthuisberg O and N2, Herestraat 49 Box 922, 3000 Leuven, Belgium.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Midi peptide designed based on m-conotoxinsA [auth 1]14Conus bullatusMutation(s): 0 
Find proteins for C1J5M7 (Conus bullatus)
Explore C1J5M7 
Go to UniProtKB:  C1J5M7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC1J5M7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 19 
  • 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: 2012-06-27
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other