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Selective bioorthogonal probe for N-glycan hybrid structures.

Mana Mohan Mukherjee1, Lara K Abramowitz1, Bhoj Kumar2

  • 1Laboratory of Cell and Molecular Biology, NIDDK, National Institutes of Health, Bethesda, MD.

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Summary

Researchers developed a new chemical reporter to specifically label hybrid N-glycans, a type of glycoprotein. This tool enables precise imaging of hybrid N-glycan-bearing proteins within cells.

Keywords:
1,3-Pr2-6-OTs GlcNAlkBioorthogonal chemistryEnzymatic labelingFibrillarin nuclear proteinHybrid N-Glycan

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Area of Science:

  • Glycobiology
  • Chemical Biology
  • Cellular Imaging

Background:

  • Metabolic labeling of glycoproteins and glycolipids using tagged monosaccharides is challenging due to shared precursor pathways.
  • Achieving selectivity in labeling is difficult, particularly for the complex and ubiquitous N-linked glycosylation, which has three main GlcNAc-containing N-glycan structures (oligomannose, hybrid, and complex).

Approach:

  • Developed a novel metabolic chemical reporter (MCR), 1,3-Pr2-6-OTs GlcNAlk, designed for selective labeling of hybrid N-glycan structures.
  • Established a general strategy to define the selectivity of labeling with chemically tagged monosaccharides.
  • Applied this strategy to confirm specific incorporation of 1,3-Pr2-6-OTs GlcNAlk into hybrid N-glycans.

Key Points:

  • 1,3-Pr2-6-OTs GlcNAlk demonstrates high specificity for labeling hybrid N-glycans.
  • The MCR facilitates the study of intracellular localization and trafficking of proteins modified with hybrid N-glycans.
  • This advancement offers a precise tool for investigating the roles of hybrid N-glycans in cellular processes.

Conclusions:

  • 1,3-Pr2-6-OTs GlcNAlk represents a next-generation MCR for targeted hybrid N-glycan labeling.
  • The developed methodology provides a robust approach for assessing MCR selectivity.
  • This work enables advanced imaging studies of hybrid N-glycan-associated protein dynamics.