1Y2P

Solution structure of Hstx3P


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function,structures with the lowest energy,structures with the least restraint violations,structures with favorable non-bond energy,structures with acceptable covalent geometry,back calculated data agree with experimental NOESY spectrum 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The impact of the fourth disulfide bridge in scorpion toxins of the alpha-KTx6 subfamily

Carrega, L.Mosbah, A.Ferrat, G.Beeton, C.Andreotti, N.Mansuelle, P.Darbon, H.De Waard, M.Sabatier, J.M.

(2005) Proteins 61: 1010-1023

  • DOI: 10.1002/prot.20681
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Animal toxins are highly reticulated and structured polypeptides that adopt a limited number of folds. In scorpion species, the most represented fold is the alpha/beta scaffold in which an helical structure is connected to an antiparallel beta-sheet ...

    Animal toxins are highly reticulated and structured polypeptides that adopt a limited number of folds. In scorpion species, the most represented fold is the alpha/beta scaffold in which an helical structure is connected to an antiparallel beta-sheet by two disulfide bridges. The intimate relationship existing between peptide reticulation and folding remains poorly understood. Here, we investigated the role of disulfide bridging on the 3D structure of HsTx1, a scorpion toxin potently active on Kv1.1 and Kv1.3 channels. This toxin folds along the classical alpha/beta scaffold but belongs to a unique family of short-chain, four disulfide-bridged toxins. Removal of the fourth disulfide bridge of HsTx1 does not affect its helical structure, whereas its two-stranded beta-sheet is altered from a twisted to a nontwisted configuration. This structural change in HsTx1 is accompanied by a marked decrease in Kv1.1 and Kv1.3 current blockage, and by alterations in the toxin to channel molecular contacts. In contrast, a similar removal of the fourth disulfide bridge of Pi1, another scorpion toxin from the same structural family, has no impact on its 3D structure, pharmacology, or channel interaction. These data highlight the importance of disulfide bridging in reaching the correct bioactive conformation of some toxins.


    Organizational Affiliation

    Laboratoire d'Ingénierie des Protéines, CNRS FRE 2738, IFR Jean Roche, Faculté de Médecine Nord, Marseille Cedex, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Neurotoxin HsTX1
A
34Heterometrus spiniferMutation(s): 0 
Find proteins for P59867 (Heterometrus spinifer)
Go to UniProtKB:  P59867
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function,structures with the lowest energy,structures with the least restraint violations,structures with favorable non-bond energy,structures with acceptable covalent geometry,back calculated data agree with experimental NOESY spectrum 
  • Olderado: 1Y2P Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance