Abstract:The trinuclear ruthenium amine Ruthenium Red (RuR) inhibits diverse ion channels including K2P potassium channels, TRPs, the mitochondrial calcium uniporter, CALHMs, ryanodine receptors, and Piezos. Despite this extraordinary array, there is very limited information for how RuR engages its targets. Here, using X-ray crystallographic and electrophysiological studies of an RuR-sensitive K2P, K2P2.1 (TREK-1) I110D, we show that RuR acts by binding an acidic residue pair comprising the 'Keystone inhibitor site' un… Show more
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