1WZ5

Solution structure of Pi1-3p


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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This is version 1.3 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:  
    1WZ5, 1Y2P

  • 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 by two disulfide bridges ...

    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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium channel blocking toxin 1A35Pandinus imperatorMutation(s): 2 
UniProt
Find proteins for Q10726 (Pandinus imperator)
Explore Q10726 
Go to UniProtKB:  Q10726
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ10726
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ABA
Query on ABA
A L-PEPTIDE LINKINGC4 H9 N O2ALA
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2005-04-19 
  • Deposition Author(s): Ferrat, G.

Revision History  (Full details and data files)

  • Version 1.0: 2005-04-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Data collection, Database references, Derived calculations