Global View of Domain-Specific O-Linked Mannose Glycosylation in Glycoengineered Cells
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Protein O-linked mannose (O-Man) glycosylation is an evolutionary conserved posttranslational modification that fulfills important biological roles during embryonic development. Three nonredundant enzyme families, POMT1/POMT2, TMTC1-4, and TMEM260, selectively coordinate the initiation of protein O-Man glycosylation on distinct classes of transmembrane proteins, including α-dystroglycan, cadherins, and plexin receptors. However, a systematic investigation of their substrate specificities is lacking, in part due to the ubiquitous expression of O-Man glycosyltransferases in cells, which precludes analysis of pathway-specific O-Man glycosylation on a proteome-wide scale. Here, we apply a targeted workflow for membrane glycoproteomics across five human cell lines to extensively map O-Man substrates and genetically deconstruct O-Man initiation by individual and combinatorial knockout of O-Man glycosyltransferase genes. We established a human cell library for the analysis of substrate specificities of individual O-Man initiation pathways by quantitative glycoproteomics. Our results identify 180 O-Man glycoproteins, demonstrate new protein targets for the POMT1/POMT2 pathway, and show that TMTC1-4 and TMEM260 pathways widely target distinct Ig-like protein domains of plasma membrane proteins involved in cell-cell and cell-extracellular matrix interactions. The identification of O-Man on Ig-like folds adds further knowledge on the emerging concept of domain-specific O-Man glycosylation which opens for functional studies of O-Man-glycosylated adhesion molecules and receptors.
Original language | English |
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Article number | 100796 |
Journal | Molecular & cellular proteomics : MCP |
Volume | 23 |
Issue number | 7 |
Number of pages | 19 |
ISSN | 1535-9476 |
DOIs | |
Publication status | Published - 2024 |
Bibliographical note
Publisher Copyright:
Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.
- cadherin, CRISPR/cas, dystroglycan, genetic engineering, glycobiology, lectins, mass spectrometry (MS), O-man, plexin, post-translational modification (PTM), protein domains, protein O-mannosyltransferases
Research areas
ID: 402284385