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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The carbohydrate moiety of a glycoprotein is typically linked to the protein through a glycosidic bond involving the anomeric carbon of the sugar and a specific amino acid residue. The most common linkages are N-glycosidic (to asparagine) and O-glycosidic, which links the sugar to

A. Serine or threonine
✓
B. Lysine or arginine
C. Cysteine or methionine
D. Glycine or proline

📝 Explanation

O-linked glycosylation involves the formation of a glycosidic bond between the anomeric carbon of a sugar (often N-acetylgalactosamine) and the hydroxyl group of a serine or threonine residue in the protein. N-linked glycosylation links to the amide nitrogen of asparagine.

📖 Additional Information

  • Serine or threonine
  • Lysine or arginine
  • Cysteine or methionine
  • Glycine or proline

O-linked glycosylation involves the formation of a glycosidic bond between the anomeric carbon of a sugar (often N-acetylgalactosamine) and the hydroxyl group of a serine or threonine residue in the protein. N-linked glycosylation links to the amide nitrogen of asparagine.

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