1LGL image
Entry Detail
PDB ID:
1LGL
Keywords:
Title:
Solution structure of HERG-specific scorpion toxin BeKm-1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2002-04-16
Release Date:
2002-11-20
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
20
Selection Criteria:
target function
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:BeKm-1 toxin
Chain IDs:A
Chain Length:36
Number of Molecules:1
Biological Source:Mesobuthus eupeus
Ligand Molecules
Primary Citation

Abstact

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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Primary Citation of related structures