Solution structure of CnErg1 (Ergtoxin), a HERG specific scorpion toxinTorres, A.M., Bansal, P., Alewood, P.F., Bursill, J.A., Kuchel, P.W., Vandenberg, J.I.
(2003) FEBS Lett 539: 138-142
- PubMed: 12650941
- DOI: https://doi.org/10.1016/s0014-5793(03)00216-3
- Primary Citation of Related Structures:
- PubMed Abstract:
The three-dimensional structure of chemically synthesized CnErg1 (Ergtoxin), which specifically blocks HERG (human ether-a-go-go-related gene) K+ channels, was determined by nuclear magnetic resonance spectroscopy. CnErg1 consists of a triple-stranded beta-sheet and an alpha-helix, as is typical of K+ channel scorpion toxins. The peptide structure differs from the canonical structures in that the first beta-strand is shorter and is nearer to the second beta-strand rather than to the third beta-strand on the C-terminus. There is also a large hydrophobic patch on the surface of the toxin, surrounding a central lysine residue, Lys13. We postulate that this hydrophobic patch is likely to form part of the binding surface of the toxin.
School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia. firstname.lastname@example.org