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Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl

[Image: see text] The publication of the first high-resolution crystal structure of a eukaryotic Cys-loop receptor, GluClα, has provided valuable structural information on this important class of ligand-gated ion channels (LGIC). However, limited functional data exist for the GluCl receptors. Before...

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Autores principales: Daeffler, Kristina N.-M., Lester, Henry A., Dougherty, Dennis A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2014
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4201344/
https://www.ncbi.nlm.nih.gov/pubmed/25051140
http://dx.doi.org/10.1021/cb500323d
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author Daeffler, Kristina N.-M.
Lester, Henry A.
Dougherty, Dennis A.
author_facet Daeffler, Kristina N.-M.
Lester, Henry A.
Dougherty, Dennis A.
author_sort Daeffler, Kristina N.-M.
collection PubMed
description [Image: see text] The publication of the first high-resolution crystal structure of a eukaryotic Cys-loop receptor, GluClα, has provided valuable structural information on this important class of ligand-gated ion channels (LGIC). However, limited functional data exist for the GluCl receptors. Before applying the structural insights from GluCl to mammalian Cys-loop receptors such as nicotinic acetylcholine and GABA receptors, it is important to ensure that established functional features of mammalian Cys-loop receptors are present in the more distantly related GluCl receptors. Here, we seek to identify ligand-binding interactions that are generally associated with Cys-loop receptors, including the frequently observed cation−π interaction. Our studies were performed on the highly homologous GluClβ receptor, because GluClα is not activated by glutamate in Xenopus laevis oocytes. Mutagenesis of the signal peptide and pore lining helix was performed to enhance functional expression and sensitivity to applied ligand, respectively. Conventional and unnatural amino acid mutagenesis indicate a strong cation−π interaction between Y206 and the protonated amine of glutamate, as well as other important ionic and hydrogen bond interactions between the ligand and the binding site, consistent with the crystal structure.
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spelling pubmed-42013442015-07-22 Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl Daeffler, Kristina N.-M. Lester, Henry A. Dougherty, Dennis A. ACS Chem Biol [Image: see text] The publication of the first high-resolution crystal structure of a eukaryotic Cys-loop receptor, GluClα, has provided valuable structural information on this important class of ligand-gated ion channels (LGIC). However, limited functional data exist for the GluCl receptors. Before applying the structural insights from GluCl to mammalian Cys-loop receptors such as nicotinic acetylcholine and GABA receptors, it is important to ensure that established functional features of mammalian Cys-loop receptors are present in the more distantly related GluCl receptors. Here, we seek to identify ligand-binding interactions that are generally associated with Cys-loop receptors, including the frequently observed cation−π interaction. Our studies were performed on the highly homologous GluClβ receptor, because GluClα is not activated by glutamate in Xenopus laevis oocytes. Mutagenesis of the signal peptide and pore lining helix was performed to enhance functional expression and sensitivity to applied ligand, respectively. Conventional and unnatural amino acid mutagenesis indicate a strong cation−π interaction between Y206 and the protonated amine of glutamate, as well as other important ionic and hydrogen bond interactions between the ligand and the binding site, consistent with the crystal structure. American Chemical Society 2014-07-22 2014-10-17 /pmc/articles/PMC4201344/ /pubmed/25051140 http://dx.doi.org/10.1021/cb500323d Text en Copyright © 2014 American Chemical Society Terms of Use (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html)
spellingShingle Daeffler, Kristina N.-M.
Lester, Henry A.
Dougherty, Dennis A.
Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title_full Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title_fullStr Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title_full_unstemmed Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title_short Functional Evaluation of Key Interactions Evident in the Structure of the Eukaryotic Cys-Loop Receptor GluCl
title_sort functional evaluation of key interactions evident in the structure of the eukaryotic cys-loop receptor glucl
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4201344/
https://www.ncbi.nlm.nih.gov/pubmed/25051140
http://dx.doi.org/10.1021/cb500323d
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