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
- PubMed Abstract:
- 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
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 sc ...
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.
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya, 16/10, 117997 Moscow, Russia. email@example.com