Solution structure of HERG-specific scorpion toxin BeKm-1

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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New binding site on common molecular scaffold provides HERG channel specificity of scorpion toxin BeKm-1.

Korolkova, Y.V.Bocharov, E.V.Angelo, K.Maslennikov, I.V.Grinenko, O.V.Lipkin, A.V.Nosyreva, E.D.Pluzhnikov, K.A.Olesen, S.P.Arseniev, A.S.Grishin, E.V.

(2002) J Biol Chem 277: 43104-43109

  • DOI: https://doi.org/10.1074/jbc.M204083200
  • Primary Citation of Related Structures:  
    1J5J, 1LGL

  • PubMed Abstract: 

    The scorpion toxin BeKm-1 is unique among a variety of known short scorpion toxins affecting potassium channels in its selective action on ether-a-go-go-related gene (ERG)-type channels. BeKm-1 shares the common molecular scaffold with other short scorpion toxins. The toxin spatial structure resolved by NMR consists of a short alpha-helix and a triple-stranded antiparallel beta-sheet. By toxin mutagenesis study we identified the residues that are important for the binding of BeKm-1 to the human ERG K+ (HERG) channel. The most critical residues (Tyr-11, Lys-18, Arg-20, Lys-23) are located in the alpha-helix and following loop whereas the "traditional" functional site of other short scorpion toxins is formed by residues from the beta-sheet. Thus the unique location of the binding site of BeKm-1 provides its specificity toward the HERG channel.

  • Organizational Affiliation

    Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya, 16/10, 117997 Moscow, Russia. july@ibch.ru

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BeKm-1 toxin36Mesobuthus eupeusMutation(s): 0 
Find proteins for Q9BKB7 (Mesobuthus eupeus)
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Go to UniProtKB:  Q9BKB7
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UniProt GroupQ9BKB7
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2002-11-20
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-12-27
    Changes: Data collection