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The two-pore-domain potassium channel TASK-1 regulates atrial action potential duration. Due to the atrium-specific expression of TASK-1 in the human heart and the functional upregulation of TASK-1 currents in atrial fibrillation (AF), TASK-1 represents a promising target for the treatment of AF. Therefore, detailed knowledge of the molecular determinants of TASK-1 inhibition may help to identify new drugs for the future therapy of AF. In the current study, the molecular determinants of TASK-1 inhibition by the potent and antiarrhythmic compound A293 (AVE1231) were studied in detail.

cellular physiology and biochemistry

Identification of the A293 (AVE1231) Binding Site in the Cardiac Two-PoreDomain Potassium Channel TASK-1: a Common Low Affinity Antiarrhythmic Drug Binding Site