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Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites

Diverse ligands of the muscle nicotinic acetylcholine receptor (nAChR) are used as muscle relaxants during surgery. Although a plethora of such molecules exists in the market, there is still a need for new drugs with rapid on/off-set, increased selectivity, and so forth. We found that pyrroloiminoqu...

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Autores principales: Kudryavtsev, Denis S., Spirova, Ekaterina N., Shelukhina, Irina V., Son, Lina V., Makarova, Yana V., Utkina, Natalia K., Kasheverov, Igor E., Tsetlin, Victor I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5923396/
https://www.ncbi.nlm.nih.gov/pubmed/29597332
http://dx.doi.org/10.3390/md16040109
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author Kudryavtsev, Denis S.
Spirova, Ekaterina N.
Shelukhina, Irina V.
Son, Lina V.
Makarova, Yana V.
Utkina, Natalia K.
Kasheverov, Igor E.
Tsetlin, Victor I.
author_facet Kudryavtsev, Denis S.
Spirova, Ekaterina N.
Shelukhina, Irina V.
Son, Lina V.
Makarova, Yana V.
Utkina, Natalia K.
Kasheverov, Igor E.
Tsetlin, Victor I.
author_sort Kudryavtsev, Denis S.
collection PubMed
description Diverse ligands of the muscle nicotinic acetylcholine receptor (nAChR) are used as muscle relaxants during surgery. Although a plethora of such molecules exists in the market, there is still a need for new drugs with rapid on/off-set, increased selectivity, and so forth. We found that pyrroloiminoquinone alkaloid Makaluvamine G (MG) inhibits several subtypes of nicotinic receptors and ionotropic γ-aminobutiric acid receptors, showing a higher affinity and moderate selectivity toward muscle nAChR. The action of MG on the latter was studied by a combination of electrophysiology, radioligand assay, fluorescent microscopy, and computer modeling. MG reveals a combination of competitive and un-competitive inhibition and caused an increase in the apparent desensitization rate of the murine muscle nAChR. Modeling ion channel kinetics provided evidence for MG binding in both orthosteric and allosteric sites. We also demonstrated that theα1 (G153S) mutant of the receptor, associated with the myasthenic syndrome, is more prone to inhibition by MG. Thus, MG appears to be a perspective hit molecule for the design of allosteric drugs targeting muscle nAChR, especially for treating slow-channel congenital myasthenic syndromes.
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spelling pubmed-59233962018-05-03 Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites Kudryavtsev, Denis S. Spirova, Ekaterina N. Shelukhina, Irina V. Son, Lina V. Makarova, Yana V. Utkina, Natalia K. Kasheverov, Igor E. Tsetlin, Victor I. Mar Drugs Article Diverse ligands of the muscle nicotinic acetylcholine receptor (nAChR) are used as muscle relaxants during surgery. Although a plethora of such molecules exists in the market, there is still a need for new drugs with rapid on/off-set, increased selectivity, and so forth. We found that pyrroloiminoquinone alkaloid Makaluvamine G (MG) inhibits several subtypes of nicotinic receptors and ionotropic γ-aminobutiric acid receptors, showing a higher affinity and moderate selectivity toward muscle nAChR. The action of MG on the latter was studied by a combination of electrophysiology, radioligand assay, fluorescent microscopy, and computer modeling. MG reveals a combination of competitive and un-competitive inhibition and caused an increase in the apparent desensitization rate of the murine muscle nAChR. Modeling ion channel kinetics provided evidence for MG binding in both orthosteric and allosteric sites. We also demonstrated that theα1 (G153S) mutant of the receptor, associated with the myasthenic syndrome, is more prone to inhibition by MG. Thus, MG appears to be a perspective hit molecule for the design of allosteric drugs targeting muscle nAChR, especially for treating slow-channel congenital myasthenic syndromes. MDPI 2018-03-28 /pmc/articles/PMC5923396/ /pubmed/29597332 http://dx.doi.org/10.3390/md16040109 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kudryavtsev, Denis S.
Spirova, Ekaterina N.
Shelukhina, Irina V.
Son, Lina V.
Makarova, Yana V.
Utkina, Natalia K.
Kasheverov, Igor E.
Tsetlin, Victor I.
Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title_full Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title_fullStr Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title_full_unstemmed Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title_short Makaluvamine G from the Marine Sponge Zyzzia fuliginosa Inhibits Muscle nAChR by Binding at the Orthosteric and Allosteric Sites
title_sort makaluvamine g from the marine sponge zyzzia fuliginosa inhibits muscle nachr by binding at the orthosteric and allosteric sites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5923396/
https://www.ncbi.nlm.nih.gov/pubmed/29597332
http://dx.doi.org/10.3390/md16040109
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