XBP1s activation can globally remodel N-glycan structure distribution patterns

Madeline Y. Wong, Kenny Chen, Aristotelis Antonopoulos, Brian T. Kasperc, Mahender B. Dewal, Rebecca J. Taylor, Charles A. Whittaker, Pyae P. Hein, Anne Dell, Joseph C. Genereux, Stuart M. Haslam, Lara K. Mahal, Matthew D. Shoulders

Research output: Contribution to journalArticlepeer-review

Abstract

Classically, the unfolded protein response (UPR) safeguards secretory pathway proteostasis. The most ancient arm of the UPR, the IRE1-activated spliced X-box binding protein 1 (XBP1s)-mediated response, has roles in secretory pathway maturation beyond resolving proteostatic stress. Understanding the consequences of XBP1s activation for cellular processes is critical for elucidating mechanistic connections between XBP1s and development, immunity, and disease. Here, we show that a key functional output of XBP1s activation is a cell type-dependent shift in the distribution of N-glycan structures on endogenous membrane and secreted proteomes. For example, XBP1s activity decreased levels of sialylation and bisecting GlcNAc in the HEK293 membrane proteome and secretome, while substantially increasing the population of oligomannose N-glycans only in the secretome. In HeLa cell membranes, stress-independent XBP1s activation increased the population of high-mannose and tetraantennary N-glycans, and also enhanced core fucosylation. mRNA profiling experiments suggest that XBP1s-mediated remodeling of the N-glycome is, at least in part, a consequence of coordinated transcriptional resculpting of N-glycan maturation pathways by XBP1s. The discovery of XBP1s-induced N-glycan structural remodeling on a glycome-wide scale suggests that XBP1s can act as a master regulator of N-glycan maturation. Moreover, because the sugars on cell-surface proteins or on proteins secreted from an XBP1s-activated cell can be molecularly distinct from those of an unactivated cell, these findings reveal a potential new mechanism for translating intracellular stress signaling into altered interactions with the extracellular environment.

Original languageEnglish (US)
Pages (from-to)E10089-E10098
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number43
DOIs
StatePublished - Oct 23 2018

Keywords

  • Endoplasmic reticulum
  • Glycoproteome
  • Lectin microarray
  • N-glycosylation
  • Proteostasis

ASJC Scopus subject areas

  • General

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