PMID: 9525854Apr 29, 1998Paper

Structural conservation in prokaryotic and eukaryotic potassium channels

Science
R MacKinnonB T Chait

Abstract

Toxins from scorpion venom interact with potassium channels. Resin-attached, mutant K+ channels from Streptomyces lividans were used to screen venom from Leiurus quinquestriatus hebraeus, and the toxins that interacted with the channel were rapidly identified by mass spectrometry. One of the toxins, agitoxin2, was further studied by mutagenesis and radioligand binding. The results show that a prokaryotic K+ channel has the same pore structure as eukaryotic K+ channels. This structural conservation, through application of techniques presented here, offers a new approach for K+ channel pharmacology.

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