Protein-bound glycogen is linked to tyrosine residues.

摘要: Tyrosine-glycogen obtained from retina proteoglycogen by exhaustive proteolytic digestion was radiolabelled with 125I. The 125I-labelled tyrosine-glycogen degraded amylolytic to a very small radioactive product, which identified as iodotyrosine h.p.l.c. mixture used released glucose and maltose that were alpha-linked the phenolic hydroxy group of p-nitrophenol. No free found before or after intact [125I]iodotyrosine-glycogen subjected two cycles Edman degradation procedure. linkage between protein glycogen alkali-stable. Therefore it is concluded protein-bound O-glycosidically linked tyrosine. amino acid has not been heretofore be involved in carbohydrates proteins.