Block of the hERG channel by bupivacaine: Electrophysiological and modeling insights towards stereochemical optimization

Sintra Grilo, Liliana; Carrupt, Pierre-Alain; Abriel, Hugues; Daina, Antoine (2011). Block of the hERG channel by bupivacaine: Electrophysiological and modeling insights towards stereochemical optimization. European journal of medicinal chemistry, 46(8), pp. 3486-98. Paris: Elsevier Masson SAS 10.1016/j.ejmech.2011.05.015

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The hERG voltage-gated potassium channel mediates the cardiac I(Kr) current, which is crucial for the duration of the cardiac action potential. Undesired block of the channel by certain drugs may prolong the QT interval and increase the risk of malignant ventricular arrhythmias. Although the molecular determinants of hERG block have been intensively studied, not much is known about its stereoselectivity. Levo-(S)-bupivacaine was the first drug reported to have a higher affinity to block hERG than its enantiomer. This study strives to understand the principles underlying the stereoselectivity of bupivacaine block with the help of mutagenesis analyses and molecular modeling simulations. Electrophysiological measurements of mutated hERG channels allowed for the identification of residues involved in bupivacaine binding and stereoselectivity. Docking and molecular mechanics simulations for both enantiomers of bupivacaine and terfenadine (a non-stereoselective blocker) were performed inside an open-state model of the hERG channel. The predicted binding modes enabled a clear depiction of ligand-protein interactions. Estimated binding affinities for both enantiomers were consistent with electrophysiological measurements. A similar computational procedure was applied to bupivacaine enantiomers towards two mutated hERG channels (Tyr652Ala and Phe656Ala). This study confirmed, at the molecular level, that bupivacaine stereoselectively binds the hERG channel. These results help to lay the foundation for structural guidelines to optimize the cardiotoxic profile of drug candidates in silico.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Ionenkanalkrankheiten 04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Ionenkanalkrankheiten
UniBE Contributor:	Abriel, Hugues
ISSN:	0223-5234
Publisher:	Elsevier Masson SAS
Funders:	[4] Swiss National Science Foundation
Projects:	[12] In vivo relevance of the PY and PDZ-domain binding motifs of the cardiac sodium channel Nav1.5 Official URL
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:20
Last Modified:	05 Dec 2022 14:05
Publisher DOI:	10.1016/j.ejmech.2011.05.015
PubMed ID:	21624711
Web of Science ID:	000292670000035
URI:	https://boris.unibe.ch/id/eprint/6854 (FactScience: 211893)