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100+ datasets found
  1. R

    Data from: Asparagine N-linked glycosylation

    biopax2, biopax3 +5
  2. e

    N-glycosylation site

    Updated Sep 1, 2020
  3. o

    Data from: Site-specific N-glycosylation of HeLa cell glycoproteins

  4. Data from: Deciphering Protein O‑Glycosylation: Solid-Phase Chemoenzymatic...

    Updated Jun 24, 2018
  5. R

    Data from: Diseases of glycosylation

    biopax2, biopax3 +5
  6. s


  7. R

    Data from: O-linked glycosylation of mucins

    biopax2, biopax3 +5
  8. o

    Data from: Site-specific O-Glycosylation Analysis of Human Blood Plasma...

    Updated Jun 5, 2015
  9. o

    Data from: Topological N-glycosylation and site-specific N-glycan sulfation...

  10. o

    Site-specific N-glycosylation Characterization of Recombinant SARS-CoV-2...

    Updated Oct 5, 2020
  11. t

    BIOGRID CURATED DATA FOR PUBLICATION: Oligosaccharyltransferase subunits...

    Updated Dec 1, 2014
  12. d

    Data from: RNA-Seq analysis of glycosylation related gene expression in...

    Updated May 1, 2019
  13. e

    Data from: The Glycosylation Design Space for Recombinant Lysosomal...

    Updated May 31, 2019
  14. Data from: SugarPy facilitates the universal, discovery-driven analysis of...

    Updated Oct 25, 2020
  15. o

    Data from: N-glycosylation Profiling of Colorectal Cancer Cell Lines Reveals...

  16. o

    Data from: Galectin binding to cells and glycoproteins with genetically...

  17. o

    Data from: Influence of Glycosylation Inhibition on the Binding of KIR3DL1...

  18. t

    BIOGRID CURATED DATA FOR PUBLICATION: Influence of N-glycosylation on...

    Updated Aug 4, 2007
  19. d

    To understand how glycosylation on human B cells is regulated during...

    Updated Sep 6, 2011
  20. o

    Data from: Proteome-wide Identification of Glycosylation-dependent...

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Giovanni Dall'Olio, Asparagine N-linked glycosylation [Dataset].

Data from: Asparagine N-linked glycosylation

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Giovanni Dall'Olio

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N-linked glycosylation is the most important form of post-translational modification for proteins synthesized and folded in the Endoplasmic Reticulum (Stanley et al. 2009). An early study in 1999 revealed that about 50% of the proteins in the Swiss-Prot database at the time were N-glycosylated (Apweiler et al. 1999). It is now established that the majority of the proteins in the secretory pathway require glycosylation in order to achieve proper folding.
The addition of an N-glycan to a protein can have several roles (Shental-Bechor & Levy 2009). First, glycans enhance the solubility and stability of the proteins in the ER, the golgi and on the outside of the cell membrane, where the composition of the medium is strongly hydrophilic and where proteins, that are mostly hydrophobic, have difficulty folding properly. Second, N-glycans are used as signal molecules during the folding and transport process of the protein: they have the role of labels to determine when a protein must interact with a chaperon, be transported to the golgi, or targeted for degradation in case of major folding defects. Third, and most importantly, N-glycans on completely folded proteins are involved in a wide range of processes: they help determine the specificity of membrane receptors in innate immunity or in cell-to-cell interactions, they can change the properties of hormones and secreted proteins, or of the proteins in the vesicular system inside the cell.
All N-linked glycans are derived from a common 14-sugar oligosaccharide synthesized in the ER, which is attached co-translationally to a protein while this is being translated inside the reticulum. The process of the synthesis of this glycan, known as Synthesis of the N-glycan precursor or LLO, constitutes one of the most conserved pathways in eukaryotes, and has been also observed in some eubacteria. The attachment usually happens on an asparagine residue within the consensus sequence asparagine-X-threonine by an complex called oligosaccharyl transferase (OST).
After being attached to an unfolded protein, the glycan is used as a label molecule in the folding process (also known as Calnexin/Calreticulin cycle) (Lederkremer 2009). The majority of the glycoproteins in the ER require at least one glycosylated residue in order to achieve proper folding, even if it has been shown that a smaller portion of the proteins in the ER can be folded without this modification.
Once the glycoprotein has achieved proper folding, it is transported via the cis-Golgi through all the Golgi compartments, where the glycan is further modified according to the properties of the glycoprotein. This process involves relatively few enzymes but due to its combinatorial nature, can lead to several millions of different possible modifications. The exact topography of this network of reactions has not been established yet, representing one of the major challenges after the sequencing of the human genome (Hossler et al. 2006).
Since N-glycosylation is involved in an great number of different processes, from cell-cell interaction to folding control, mutations in one of the genes involved in glycan assembly and/or modification can lead to severe development problems (often affecting the central nervous system). All the diseases in genes involved in glycosylation are collectively known as Congenital Disorders of Glycosylation (CDG) (Sparks et al. 2003), and classified as CDG type I for the genes in the LLO synthesis pathway, and CDG type II for the others.

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