FEBS Lett. 1990 Jun 18;266(1-2):167-70.

Location and characterization of the three carbohydrate prosthetic groups of human protein HC.

Escribano J, Lopex-Otin C, Hjerpe A, Grubb A, Mendez E.

Source

Servicio de Endocrinologia, Hospital Ramon y Cajal, Madrid, Spain.

Abstract

Three different carbohydrate prosthetic groups associated to three chymotryptic peptides, Q1, Q2 and Q3, were isolated from the reduced and carboxymethylated human protein HC. The first oligosaccharide forms an O-glycosidic linkage with a threonine residue at position 5 in the polypeptide chain of protein HC. The second and third carbohydrate prosthetic groups form N-linkages with asparagine residues at positions 17 and 96. Oligosaccharides present in Q1 contain 1 residue of NANA, 2 of GalNAc and 1 of Gal corresponding to the following structure: -O-GalNAc-GalNAc-Gal-NANA. Q2 contains 3 NANA, 9 GlcNAc, 2 Gal and 3 Man, and Q3 contains 2 NANA, 5 GlcNAc, 1 Gal and 2 Man. The sugar compositions of Q2 and Q3 oligosaccharides are compatible with that of the complex kind. The amount of oligosaccharides present in Q1, Q2 and Q3 corresponded respectively to 3.0%, 12.2% and 7.3% of the weight of protein HC. No difference was found between the carbohydrate composition of urinary and plasma protein HC.

PMID:: 1694784; [PubMed - indexed for MEDLINE]

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