Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa
Odorant-binding proteins (OBP) are secreted in the nasal mucus at the vicinity of olfactory receptors (ORs). They act, at least, as an interface between hydrophobic and volatile odorant molecules and the hydrophilic medium bathing the ORs. They have also been hypothesized to be part of the molecular...
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Frontiers Media S.A.
2019-01-01
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| Series: | Frontiers in Endocrinology |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fendo.2018.00816/full |
| _version_ | 1819111432153726976 |
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| author | Patricia Nagnan-Le Meillour Alexandre Joly Chrystelle Le Danvic Chrystelle Le Danvic Arul Marie Séverine Zirah Jean-Paul Cornard |
| author_facet | Patricia Nagnan-Le Meillour Alexandre Joly Chrystelle Le Danvic Chrystelle Le Danvic Arul Marie Séverine Zirah Jean-Paul Cornard |
| author_sort | Patricia Nagnan-Le Meillour |
| collection | DOAJ |
| description | Odorant-binding proteins (OBP) are secreted in the nasal mucus at the vicinity of olfactory receptors (ORs). They act, at least, as an interface between hydrophobic and volatile odorant molecules and the hydrophilic medium bathing the ORs. They have also been hypothesized to be part of the molecular coding of odors and pheromones, by forming specific complexes with odorant molecules that could ultimately stimulate ORs to trigger the olfactory transduction cascade. In a previous study, we have evidenced that pig olfactory secretome was composed of numerous olfactory binding protein isoforms, generated by O-GlcNAcylation and phosphorylation. In addition, we have shown that recombinant OBP (stricto sensu) produced in yeast is made up of a mixture of isoforms that differ in their phosphorylation pattern, which in turn determines binding specificity. Taking advantage of the high amount of OBP secreted by a single animal, we performed a similar study, under exactly the same experimental conditions, on native isoforms isolated from pig, Sus scrofa, nasal tissue. Four fractions were obtained by using strong anion exchange HPLC. Mapping of phosphorylation and O-GlcNAcylation sites by CID-nanoLC-MS/MS allowed unambiguous localization of phosphosites at S13 and T122 and HexNAc sites at S13 and S19. T112 or T115 could also be phosphorylated. BEMAD analysis suggested extra phosphosites located at S23, S24, S41, S49, S57, S67, and T71. Due to the very low stoichiometry of GlcNAc-peptides and phosphopeptides, these sites were identified on total mixture of OBP isoforms instead of HPLC-purified OBP isoforms. Nevertheless, binding properties of native OBP isoforms to specific ligands in S. scrofa were monitored by fluorescence spectroscopy. Recombinant phosphorylated OBP-Pichia isoforms bind steroids and fatty acids with slight differences. Native isoforms, that are phosphorylated but also O-GlcNAcylated show radically different binding affinities for the same compounds, which strongly suggests that O-GlcNAcylation increases the binding specificity of OBP isoforms. These findings extend the role of O-GlcNAc in regulating the function of proteins involved in many mechanisms of metabolic homeostasis, including extracellular signaling in olfaction. Data is available via ProteomeXChange with identifier PXD011371. |
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| id | doaj.art-59bd84c47f9a45d2a4ceda301e30872a |
| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-12-22T03:57:31Z |
| publishDate | 2019-01-01 |
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| spelling | doaj.art-59bd84c47f9a45d2a4ceda301e30872a2022-12-21T18:39:49ZengFrontiers Media S.A.Frontiers in Endocrinology1664-23922019-01-01910.3389/fendo.2018.00816429973Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofaPatricia Nagnan-Le Meillour0Alexandre Joly1Chrystelle Le Danvic2Chrystelle Le Danvic3Arul Marie4Séverine Zirah5Jean-Paul Cornard6Unité de Glycobiologie Structurale et Fonctionnelle, UMR8576, USC-UGSF INRA 1409, CNRS-Université de Lille, Lille, FranceUnité de Glycobiologie Structurale et Fonctionnelle, UMR8576, USC-UGSF INRA 1409, CNRS-Université de Lille, Lille, FranceUnité de Glycobiologie Structurale et Fonctionnelle, UMR8576, USC-UGSF INRA 1409, CNRS-Université de Lille, Lille, FranceALLICE R&D, Paris, FranceUnité Molécules de Communication et Adaptation des Microorganismes, Muséum National d'Histoire Naturelle, UMR 7245 CNRS/MNHN, Paris, FranceUnité Molécules de Communication et Adaptation des Microorganismes, Muséum National d'Histoire Naturelle, UMR 7245 CNRS/MNHN, Paris, FranceLaboratoire de Spectroscopie Infrarouge et Raman, UMR8516 CNRS-Université de Lille, Lille, FranceOdorant-binding proteins (OBP) are secreted in the nasal mucus at the vicinity of olfactory receptors (ORs). They act, at least, as an interface between hydrophobic and volatile odorant molecules and the hydrophilic medium bathing the ORs. They have also been hypothesized to be part of the molecular coding of odors and pheromones, by forming specific complexes with odorant molecules that could ultimately stimulate ORs to trigger the olfactory transduction cascade. In a previous study, we have evidenced that pig olfactory secretome was composed of numerous olfactory binding protein isoforms, generated by O-GlcNAcylation and phosphorylation. In addition, we have shown that recombinant OBP (stricto sensu) produced in yeast is made up of a mixture of isoforms that differ in their phosphorylation pattern, which in turn determines binding specificity. Taking advantage of the high amount of OBP secreted by a single animal, we performed a similar study, under exactly the same experimental conditions, on native isoforms isolated from pig, Sus scrofa, nasal tissue. Four fractions were obtained by using strong anion exchange HPLC. Mapping of phosphorylation and O-GlcNAcylation sites by CID-nanoLC-MS/MS allowed unambiguous localization of phosphosites at S13 and T122 and HexNAc sites at S13 and S19. T112 or T115 could also be phosphorylated. BEMAD analysis suggested extra phosphosites located at S23, S24, S41, S49, S57, S67, and T71. Due to the very low stoichiometry of GlcNAc-peptides and phosphopeptides, these sites were identified on total mixture of OBP isoforms instead of HPLC-purified OBP isoforms. Nevertheless, binding properties of native OBP isoforms to specific ligands in S. scrofa were monitored by fluorescence spectroscopy. Recombinant phosphorylated OBP-Pichia isoforms bind steroids and fatty acids with slight differences. Native isoforms, that are phosphorylated but also O-GlcNAcylated show radically different binding affinities for the same compounds, which strongly suggests that O-GlcNAcylation increases the binding specificity of OBP isoforms. These findings extend the role of O-GlcNAc in regulating the function of proteins involved in many mechanisms of metabolic homeostasis, including extracellular signaling in olfaction. Data is available via ProteomeXChange with identifier PXD011371.https://www.frontiersin.org/article/10.3389/fendo.2018.00816/fullO-GlcNAcodorant-binding proteinphosphorylationCID-nano-LC-MS/MSfluorescence spectroscopypheromone |
| spellingShingle | Patricia Nagnan-Le Meillour Alexandre Joly Chrystelle Le Danvic Chrystelle Le Danvic Arul Marie Séverine Zirah Jean-Paul Cornard Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa Frontiers in Endocrinology O-GlcNAc odorant-binding protein phosphorylation CID-nano-LC-MS/MS fluorescence spectroscopy pheromone |
| title | Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa |
| title_full | Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa |
| title_fullStr | Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa |
| title_full_unstemmed | Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa |
| title_short | Binding Specificity of Native Odorant-Binding Protein Isoforms Is Driven by Phosphorylation and O-N-Acetylglucosaminylation in the Pig Sus scrofa |
| title_sort | binding specificity of native odorant binding protein isoforms is driven by phosphorylation and o n acetylglucosaminylation in the pig sus scrofa |
| topic | O-GlcNAc odorant-binding protein phosphorylation CID-nano-LC-MS/MS fluorescence spectroscopy pheromone |
| url | https://www.frontiersin.org/article/10.3389/fendo.2018.00816/full |
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