Synthetic Analogs of the Snail Toxin 6-Bromo-2-Mercaptotryptamine Dimer (BrMT) Reveal That Lipid Bilayer Perturbation Does Not Underlie Its Modulation of Voltage-Gated Potassium Channels

21 February 2018, Version 1


Distinguishing membrane perturbation from more direct protein-ligand interactions is an ongoing challenge in chemical biology. Herein, we present one strategy for doing so, using dimeric 6-bromo-2-mercaptotryptamine (BrMT) and synthetic analogs. BrMT is a chemically unstable marine snail toxin that has unique effects on voltage-gated K+ channel proteins, making it an attractive medicinal chemistry lead. BrMT is amphiphilic and perturbs lipid bilayers, raising the question of whether its action against K+ channels is merely a manifestation of membrane perturbation. To determine whether medicinal chemistry approaches to improve BrMT might be viable, we synthesized BrMT and 11 analogs and determined their activities in parallel assays measuring K+ channel activity and lipid bilayer properties. Our work demonstrates a strategy for determining if drugs act by specific interactions or bilayer-dependent mechanisms, and chemically stable modulators of Kv1 channels are reported.


voltage-gated potassium channel
snail toxin
allosteric modulator
isothermal titration calorimetry
gramicidin-based fluorescence quench assay
membrane-based perturbation studies

Supplementary materials

2018 02 20 BrMT analogs SI


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