2AXK

Solution structure of discrepin, a scorpion venom toxin blocking K+ channels.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy and best secondary structure 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Solution structure of discrepin, a new K+-channel blocking peptide from the alpha-KTx15 subfamily.

Prochnicka-Chalufour, A.Corzo, G.Satake, H.Martin-Eauclaire, M.-F.Murgia, A.R.Prestipino, G.D'Suze, G.Possani, L.D.Delepierre, M.

(2006) Biochemistry 45: 1795-1804

  • DOI: 10.1021/bi0519248
  • Primary Citation of Related Structures:  
    2AXK

  • PubMed Abstract: 
  • Discrepin, isolated from the venom of the Venezuelan scorpion Tityus discrepans, blocks preferentially the I(A) currents of the voltage-dependent K+ channel of rat cerebellum granular cells in an irreversible way. It contains 38 amino acid residues with a pyroglutamic acid as the N-terminal residue [D'Suze, G ...

    Discrepin, isolated from the venom of the Venezuelan scorpion Tityus discrepans, blocks preferentially the I(A) currents of the voltage-dependent K+ channel of rat cerebellum granular cells in an irreversible way. It contains 38 amino acid residues with a pyroglutamic acid as the N-terminal residue [D'Suze, G., Batista, C. V., Frau, A., Murgia, A. R., Zamudio, F. Z., Sevcik, C., Possani, L. D., and Prestipino, G. (2004) Arch. Biochem. Biophys. 430, 256-63]. It is the most distinctive member of the alpha-KTx15 subfamily of scorpion toxins. Six members of the alpha-KTx15 subfamily have been reported so far to be specific for this subtype of the K+ channel; however, none of them have had their three-dimensional structure determined, and no information for the residues possibly involved in channel recognition and binding is available. Natural discrepin (n-discrepin) was prepared from scorpion venom, and its synthetic analogue (s-discrepin) was obtained by solid-phase synthesis. Analysis of two-dimensional 1H NMR spectra of n- and s-discrepin indicates that both peptides have the same structure. Here we report the solution structure of s-discrepin determined by NMR using 565 meaningful distance constraints derived from the volume integration of the two-dimensional NOESY spectrum, 22 dihedrals, and three hydrogen bonds. Discrepin displays the alpha/beta scaffold, characteristic of scorpion toxins. Some features of the proposed interacting surface between the toxin and channel as well as the opposite "alpha-helix surface" are discussed in comparison with those of other alpha-KTx15 members. Both n- and s-discrepin exhibit similar physiological actions as verified by patch-clamp and binding and displacement experiments.


    Related Citations: 
    • Discrepin, a new peptide of the sub-family alpha-ktx15, isolated from the scorpion Tityus discrepans irreversibly blocks K+-channels (IA currents) of cerebellum granular cells.
      D'Suze, G., Batista, C.V.F., Frau, A., Murgia, A.R., Zamudio, F.Z., Sevcik, C., Possani, L.D., Prestipino, G.
      (2004) Arch Biochem Biophys 430: 256

    Organizational Affiliation

    Unité de RMN des Biomolécules URA 2185 CNRS, Institut Pasteur, 28 Rue du Dr Roux, 75724 Paris Cedex 15, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
discrepinA38N/AMutation(s): 0 
UniProt
Find proteins for P84777 (Tityus discrepans)
Explore P84777 
Go to UniProtKB:  P84777
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy and best secondary structure 
  • OLDERADO: 2AXK Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-20
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-12-25
    Changes: Derived calculations, Polymer sequence