Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing
Posttranslational modifications occurring during the biosynthesis of G protein-coupled receptors include glycosylation and palmitoylation at conserved cysteine residues located in the carboxyl-terminus (Ctail) of the receptor. In a number of these receptors, these modifications play an important rol...
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doaj-1e0c201faf4b4ad88ea8cff89508957c2020-11-24T21:56:02ZengFrontiers Media S.A.Frontiers in Cell and Developmental Biology2296-634X2016-07-01410.3389/fcell.2016.00076206091Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processingBrenda Melo-Nava0Patricia Casas-González1Marco Pérez-Solís2Jean Castillo-Badillo3José L. Maravillas-Montero4Eduardo Jardón-Valadez5Teresa Zariñán6Arturo Aguilar-Rojas7Nathalie GALLAY8Eric Reiter9Alfredo Ulloa-Aguirre10IMSSIMSSIMSSIMSSUniversidad Nacional Autónoma de MéxicoUniversidad Autónoma MetropolitanaUniversidad Nacional Autónoma de MéxicoIMSSInstitut National de la Recherche AgronomiqueInstitut National de la Recherche AgronomiqueUniversidad Nacional Autónoma de MéxicoPosttranslational modifications occurring during the biosynthesis of G protein-coupled receptors include glycosylation and palmitoylation at conserved cysteine residues located in the carboxyl-terminus (Ctail) of the receptor. In a number of these receptors, these modifications play an important role in receptor function and particularly, in intracellular trafficking. In the present study, the three cysteine residues present in the carboxyl-terminus of the human FSHR were replaced with glycine by site-directed mutagenesis. Wild-type and mutant (Cys627/629/655Gly) FSHRs were then transiently expressed in HEK-293 cells and analyzed for cell-surface plasma membrane expression, agonist-stimulated signaling and internalization, and postendocytic processing in the abscence and presence of lysosome and/or proteasome inhibitors. Compared with the wild-type FSHR, the triple mutant FSHR exhibited ~70% reduction in plasma membrane expression as well as a profound attenuation in agonist-stimulated cAMP production and ERK1/2 phosphorylation. Incubation of HEK-293 cells expressing the wild-type FSHR with 2-bromopalmitate (palmitoylation inhibitor) for 6 h, decreased plasma membrane expression of the receptor by ~30%. The internalization kinetics and β-arrestin 1 and 2 recruitment were similar between the wild-type and triple mutant FSHR as disclosed by assays performed in non-equilibrium binding conditions and by confocal microscopy. Cells expressing the mutant FSHR recycled the internalized FSHR back to the plasma membrane less efficiently than those expressing the wild-type FSHR, an effect that was counteracted by proteasome but not by lysosome inhibition. These results indicate that replacement of the cysteine residues present in the carboxyl-terminus of the FSHR, impairs receptor trafficking from the endoplasmic reticulum/Golgi apparatus to the plasma membrane and its recycling from endosomes back to the cell surface following agonist-induced internalization. Since in the FSHR these cysteine residues are S-palmitoylated, the data presented emphasize on this posttranslational modification as an important factor for both upward and downward trafficking of this receptor.http://journal.frontiersin.org/Journal/10.3389/fcell.2016.00076/fullRecyclinginternalizationpalmitoylationFollicle-stimulating hormoneFollicle-stimulating hormone receptorFollitropin |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Brenda Melo-Nava Patricia Casas-González Marco Pérez-Solís Jean Castillo-Badillo José L. Maravillas-Montero Eduardo Jardón-Valadez Teresa Zariñán Arturo Aguilar-Rojas Nathalie GALLAY Eric Reiter Alfredo Ulloa-Aguirre |
spellingShingle |
Brenda Melo-Nava Patricia Casas-González Marco Pérez-Solís Jean Castillo-Badillo José L. Maravillas-Montero Eduardo Jardón-Valadez Teresa Zariñán Arturo Aguilar-Rojas Nathalie GALLAY Eric Reiter Alfredo Ulloa-Aguirre Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing Frontiers in Cell and Developmental Biology Recycling internalization palmitoylation Follicle-stimulating hormone Follicle-stimulating hormone receptor Follitropin |
author_facet |
Brenda Melo-Nava Patricia Casas-González Marco Pérez-Solís Jean Castillo-Badillo José L. Maravillas-Montero Eduardo Jardón-Valadez Teresa Zariñán Arturo Aguilar-Rojas Nathalie GALLAY Eric Reiter Alfredo Ulloa-Aguirre |
author_sort |
Brenda Melo-Nava |
title |
Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
title_short |
Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
title_full |
Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
title_fullStr |
Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
title_full_unstemmed |
Role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
title_sort |
role of cysteine residues in the carboxyl-terminus of the follicle-stimulating hormone receptor in intracellular traffic and postendocytic processing |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Cell and Developmental Biology |
issn |
2296-634X |
publishDate |
2016-07-01 |
description |
Posttranslational modifications occurring during the biosynthesis of G protein-coupled receptors include glycosylation and palmitoylation at conserved cysteine residues located in the carboxyl-terminus (Ctail) of the receptor. In a number of these receptors, these modifications play an important role in receptor function and particularly, in intracellular trafficking. In the present study, the three cysteine residues present in the carboxyl-terminus of the human FSHR were replaced with glycine by site-directed mutagenesis. Wild-type and mutant (Cys627/629/655Gly) FSHRs were then transiently expressed in HEK-293 cells and analyzed for cell-surface plasma membrane expression, agonist-stimulated signaling and internalization, and postendocytic processing in the abscence and presence of lysosome and/or proteasome inhibitors. Compared with the wild-type FSHR, the triple mutant FSHR exhibited ~70% reduction in plasma membrane expression as well as a profound attenuation in agonist-stimulated cAMP production and ERK1/2 phosphorylation. Incubation of HEK-293 cells expressing the wild-type FSHR with 2-bromopalmitate (palmitoylation inhibitor) for 6 h, decreased plasma membrane expression of the receptor by ~30%. The internalization kinetics and β-arrestin 1 and 2 recruitment were similar between the wild-type and triple mutant FSHR as disclosed by assays performed in non-equilibrium binding conditions and by confocal microscopy. Cells expressing the mutant FSHR recycled the internalized FSHR back to the plasma membrane less efficiently than those expressing the wild-type FSHR, an effect that was counteracted by proteasome but not by lysosome inhibition. These results indicate that replacement of the cysteine residues present in the carboxyl-terminus of the FSHR, impairs receptor trafficking from the endoplasmic reticulum/Golgi apparatus to the plasma membrane and its recycling from endosomes back to the cell surface following agonist-induced internalization. Since in the FSHR these cysteine residues are S-palmitoylated, the data presented emphasize on this posttranslational modification as an important factor for both upward and downward trafficking of this receptor. |
topic |
Recycling internalization palmitoylation Follicle-stimulating hormone Follicle-stimulating hormone receptor Follitropin |
url |
http://journal.frontiersin.org/Journal/10.3389/fcell.2016.00076/full |
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