Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.1 kDa 
• Atom Count: 283 
• Modelled Residue Count: 36 
• Deposited Residue Count: 36 
• Unique protein chains: 1

 1LGL

Solution structure of HERG-specific scorpion toxin BeKm-1

• PDB DOI: 10.2210/pdb1LGL/pdb
• BMRB: 5184

• Classification: TOXIN
• Organism(s): Mesobuthus eupeus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-04-16 Released: 2002-11-20 
• Deposition Author(s): Korolokova, Y.V., Bocharov, E.V., Angelo, K., Maslennikov, I.V., Grinenko, O.V., Lipkin, A.V., Nosireva, E.D., Pluzhnikov, K.A., Olesen, S.-P., Arseniev, A.S., Grishin, E.V.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

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

• PubMed: 12151390 
• DOI: 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.

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Related Citations: 

• An ERG Channel Inhibitor from the Scorpion Buthus eupeus
  Korolkova, Y.V., Kozlov, S.A., Lipkin, A.V., Pluzhnikov, K.A., Hadley, J.K., Filippov, A.K., Brown, D.A., Angelo, K., Strobek, D., Jespersen, T., Olesen, S.P., Jensen, B.S., Grishin, E.V.
  (2001) J Biol Chem 276: 9868

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Organizational Affiliation: 

Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya, 16/10, 117997 Moscow, Russia. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BeKm-1 toxin	A	36	Mesobuthus eupeus	Mutation(s): 0
UniProt
Find proteins for Q9BKB7 (Mesobuthus eupeus) Explore Q9BKB7  Go to UniProtKB:  Q9BKB7

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-11-20 
Deposition Author(s): Korolokova, Y.V., Bocharov, E.V., Angelo, K., Maslennikov, I.V., Grinenko, O.V., Lipkin, A.V., Nosireva, E.D., Pluzhnikov, K.A., Olesen, S.-P., Arseniev, A.S., Grishin, E.V.

Revision History  

• Version 1.0: 2002-11-20
  Type: Initial release
  
• Version 1.1: 2008-04-28
  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