Article number:


CAS No.:


Chemical description:

Sequence: pGlu-Phe-Thr-AspVal-Asp-Cys-Ser-Val-Ser-Lys-GIu-Cys-Trp-Ser-Val-Cys-Lys-Asp-Leu-Phe-Gly-Val-Asp-Arg-Gly-Lys-Cys-Met-Gly-Lys-Lys-Cys-Arg-Cys-Tyr-GIn-OH; Disulfide bridges: Cys7-Cys28, Cys13-Cys33, Cys17-Cys35

Molecular weight:

4230,8 g/mol

Iberiotoxin (IbTx) is a toxin that was originally isolated from Buthus tamulus scorpion venom. Iberiotoxin inhibits selectively the high conductance Ca2+-activated K+ channel (KCa1.1). This toxin does not affect other types of voltage-dependent K+ channels which are sensitive to the Charybdotoxin. Iberiotoxin is a valuable tool to study specifically Maxi-K channels.

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