135 390 

Selective blocker of ERG1 channel

BeKm-1 toxin is a peptide toxin that has been isolated from the venom of the Central Asian scorpion Buthus eupeus. BeKm-1 toxin has been reported to be a highly selective inhibitor of the human ether-a-go-go ERG1 channel (hERG1)BeKm-1 inhibits hERG1 channels expressed in HEK-293 cells with an IC50 of 3.3 nM, but has no effect at 100 nM on human EAG, human SK1, rat SK2, human IK, human BK, KCNQ1/KCNE1, KCNQ2/KCNQ3, and KCNQ4 channels. It has also minimal effects on rat ELK1 channel. BeKm-1 inhibits the human ERG1 + KCNE1 combination transiently expressed in HEK-293 cells with an IC50 value in the range of 10 to 30 nM. BeKm-1 toxin preferentially blocks human ERG channel through the closed (resting) state, although some open channel blockade is also reported to occur.

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AA sequence: Arg-Pro-Thr-Asp-Ile-Lys-Cys7-Ser-Glu-Ser-Tyr-Gln-Cys13-Phe-Pro-Val-Cys17-Lys-Ser-Arg-Phe-Gly-Lys-Thr-Asn-Gly-Arg-Cys28-Val-Asn-Gly-Phe-Cys33-Asp-Cys35-Phe-OH
Disulfide bonds: Cys7-Cys28, Cys13-Cys33, and Cys17-Cys35
Length (aa): 36
Formula: C174H261N51O52S6
Molecular Weight: 4091.70 Da
Appearance: White lyophilized solid
Solubility: water and saline buffer
CAS number: Not available
Source: Synthetic
Purity rate: > 97%

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Interaction simulation of hERG K+ channel with its specific BeKm-1 peptide: insights into the selectivity of molecular recognition.

BeKm-1, a peptide inhibitor of human ether-a-go-go-related gene potassium currents, prolongs QTc intervals in isolated rabbit heart.

Preferential closed channel blockade of HERG potassium currents by chemically synthesised BeKm-1 scorpion toxin.

New binding site on common molecular scaffold provides HERG channel specificity of scorpion toxin BeKm-1.

An ERG channel inhibitor from the scorpion Buthus eupeus.

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