Mapping the O-Mannose glycoproteome in saccharomyces cerevisiae

O-Mannosylation is a vital protein modification conserved from fungi to humans. Yeast is a perfect model to study this post-translational modification, because in contrast to mammals O-mannosylation is the only type of O-glycosylation. In an essential step toward the full understanding of protein O-...

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Hauptverfasser: Neubert, Patrick (VerfasserIn) , Zatorska, Ewa (VerfasserIn) , Loibl, Martin (VerfasserIn) , Castells Ballester, Joan (VerfasserIn) , Strahl, Sabine (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: January 13, 2016
In: Molecular & cellular proteomics
Year: 2016, Jahrgang: 15, Heft: 4, Pages: 1323-1337
ISSN:1535-9484
DOI:10.1074/mcp.M115.057505
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1074/mcp.M115.057505
Verlag, kostenfrei, Volltext: http://www.mcponline.org/content/15/4/1323
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Verfasserangaben:Patrick Neubert, Adnan Halim, Martin Zauser, Andreas Essig, Hiren J. Joshi, Ewa Zatorska, Ida Signe Bohse Larsen, Martin Loibl, Joan Castells-Ballester, Markus Aebi, Henrik Clausen, and Sabine Strahl

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520 |a O-Mannosylation is a vital protein modification conserved from fungi to humans. Yeast is a perfect model to study this post-translational modification, because in contrast to mammals O-mannosylation is the only type of O-glycosylation. In an essential step toward the full understanding of protein O-mannosylation we mapped the O-mannose glycoproteome in baker's yeast. Taking advantage of an O-glycan elongation deficient yeast strain to simplify sample complexity, we identified over 500 O-glycoproteins from all subcellular compartments for which over 2300 O-mannosylation sites were mapped by electron-transfer dissociation (ETD)-based MS/MS. In this study, we focus on the 293 O-glycoproteins (over 1900 glycosylation sites identified by ETD-MS/MS) that enter the secretory pathway and are targets of ER-localized protein O-mannosyltransferases. We find that O-mannosylation is not only a prominent modification of cell wall and plasma membrane proteins, but also of a large number of proteins from the secretory pathway with crucial functions in protein glycosylation, folding, quality control, and trafficking. The analysis of glycosylation sites revealed that O-mannosylation is favored in unstructured regions and β-strands. Furthermore, O-mannosylation is impeded in the proximity of N-glycosylation sites suggesting the interplay of these types of post-translational modifications. The detailed knowledge of the target proteins and their O-mannosylation sites opens for discovery of new roles of this essential modification in eukaryotes, and for a first glance on the evolution of different types of O-glycosylation from yeast to mammals. 
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