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Structure of glycoproteins. Glycoproteins are mainly glycosylated with N-linked and O-linked glycans. N-glycans are attached to the asparagine residues, and they are processed in the Golgi apparatus to yield oligomannose, hybrid, and complex-type N-glycan structures. The mucin-type O-linked glycosylation mainly contains four common O-linked glycan cores. Non-mucin-type O-glycosylations are produced by attaching GlcNAc, mannose, fucose, glucose, galactose, or xylose to the amino acid.
