Article ; Online: 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.
2019 Volume 52, Issue 5, Page(s) 1223–1235
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), ... ...
| 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. Strikingly, TASK-1 inhibition by the low affinity antiarrhythmic TASK-1 blockers propafenone, amiodarone and carvedilol was also strongly diminished by mutations at this novel binding site. Conclusion: We have identified the A293 binding site in the central cavity of TASK-1 and propose that this site might represent a conserved site of action for many low affinity antiarrhythmic TASK-1 blockers. |
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| MeSH term(s) | Amino Acid Substitution ; Animals ; Anti-Arrhythmia Agents/chemistry ; Binding Sites ; Humans ; Mutagenesis, Site-Directed ; Mutation, Missense ; Nerve Tissue Proteins/antagonists & inhibitors ; Nerve Tissue Proteins/chemistry ; Nerve Tissue Proteins/genetics ; Nerve Tissue Proteins/metabolism ; Potassium Channels, Tandem Pore Domain/antagonists & inhibitors ; Potassium Channels, Tandem Pore Domain/chemistry ; Potassium Channels, Tandem Pore Domain/genetics ; Potassium Channels, Tandem Pore Domain/metabolism ; Xenopus laevis | |||||
| Chemical Substances | Anti-Arrhythmia Agents ; Nerve Tissue Proteins ; Potassium Channels, Tandem Pore Domain ; potassium channel subfamily K member 3 (1HQ3YCN4GS) | |||||
| Language | English | |||||
| Publishing date | 2019-04-18 | |||||
| Publishing country | Germany | |||||
| Document type | Journal Article | |||||
| ZDB-ID | 1067572-3 | |||||
| ISSN | 1421-9778 ; 1015-8987 | |||||
| ISSN (online) | 1421-9778 | |||||
| ISSN | 1015-8987 | |||||
| DOI | 10.33594/000000083 | |||||
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| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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