Eukaryotic cells synthesize many different kinds of glycoconjugates including glycoproteins, glycolipids and proteoglycans. Different cell compartments are equipped with specific synthetic enzymes that are used to build and modify the glycans. Once synthesized, the glycoconjugates reside in different cell locations or are secreted out of the cell.
In the lumen of the endoplasmic reticulum (ER) N-glycans are transferred to specific asparagine residues of the nascent polypeptide, a process intimately associated with protein folding (1).
As the protein migrates through the ER and Golgi apparatus, specific enzymes trim back the glycan chain, while other enzymes add new monosaccharides to the glycan structure (2).
In the Golgi, the glycoproteins are sorted for distribution to their final destination: cell compartments (such as the vacuole), the cell surface, or they are secreted (3) (Fig. 1).
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