Main types
Glycopeptide linkage of protein is called glycopeptide bond for short. The types of glycopeptide chains can be summarized as follows:
① N-glycoside bond type: oligosaccharide chain (GlcNAC β - Hydroxyl group) is connected with the amide group of Asn, the a-amino group of the N-terminal, the W-amino group of Lys or Arg
② O-glycoside bond type: oligosaccharide chain (GalNAC α - Hydroxy) and Ser serine, Thr threonine, tyrosine and hydroxylysine hydroxyproline The hydroxyl group of is connected. ③ S-glycoside bond type: glycopeptide bond with cysteine as the junction point.
④ Ester glycoside bond type: take the free carboxyl group of aspartic acid and glutamic acid as the connection point.
