N-glycosylation and O-glycosylation
There are two types of glycoproteins:
- In N-glycosylation (see on the right), the addition of sugar chains can happen at the amide nitrogen on the side-chain of the asparagine.
- In O-glycosylation, the addition of sugar chains can happen on the hydroxyl oxygen on the side-chain of hydroxylysine, hydroxyproline, serine, or threonine.
Read more about this topic: Glycoprotein