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

Wiedmann, F.; Kiper, A. K.; Bedoya, M.; Ratte, A.; Rinné, S.; Kraft, M.; Waibel, M.; Anad, P.; Wenzel, W.; González, W.; Katus, H. A.; Decher, N.; Schmidt, C.

Abstract:
Background/Aims: 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. Methods: Alanine-scanning mutagenesis together with two-electrode voltage-clamp recordings were combined with in silico docking experiments. Results: Here, we have identified Q126 located in the M2 segment together with L239 and N240 of the M4 segment as amino acids essential for the A293-mediated inhibition of TASK‑1. These data indicate a binding site which is different to that of A1899 for which also residues of the pore signature sequence and the late M4 segments are essential. Using in silico docking experiments, we propose a binding site at the lower end of the cytosolic pore, located at the entry to lateral side fenestrations of TASK-1. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000095214
Veröffentlicht am 14.06.2019
Originalveröffentlichung
DOI: 10.33594/000000083
Scopus
Zitationen: 3
Coverbild
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1015-8987, 1421-9778
KITopen-ID: 1000095214
HGF-Programm 43.21.04 (POF III, LK 01)
Erschienen in Cellular physiology and biochemistry
Band 52
Heft 5
Seiten 1223-1235
Schlagworte A1899, A293, Atrial arrhythmopathy, Atrial cardiomyopathy, Atrial fibrillation, AVE1231, Drug binding site, K2P3.1, KCNK3, TASK-1, Two-pore-domain potassium channels
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