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- W1965679362 abstract "Human transferrin receptor was isolated from placenta and from the hepatocarcinoma cell line Hep G2. Asparagine-linked oligosaccharides were released by treatment of tryptic glycopeptides with endo-β-N-acetylglucosaminidase H or peptide-N4-(N-acetyl-β-glucosaminyl)asparagine amidase F. Oligosaccharide alditols were fractionated by anion-exchange high-performance liquid chromatography and by high-pH anion-exchange chromatography. Glycans from placental transferrin receptor were further characterized, after desialylation, by methylation analysis and, in part, by liquid secondary-ion mass spectrometry. Sialylation of placental transferrin receptor was examined by lectin affinity blotting with Sambucus nigra agglutinin and Maackia amurensis agglutinin. In order to trace possible inter-individual differences in N-glycosylation of the receptor, two preparations of placental transferrin receptor purified from two donors were compared. The results demonstrate that human transferrin receptor from placenta predominantly carries diantennary and triantennary N-acetyllactosaminic glycans as well as hybrid-type species, the galactose residues of which being almost completely substituted with (α2–3)-linked sialic acid residues. Distinct differences were noted in the glycosylation pattern of the receptor from different individuals. Transferrin receptor from donor A carried predominantly diantennary and triantennary complex-type glycans, in part fucosylated at the innermost N-acetylglucosamine residue, in addition to small amounts of bisected and of incomplete diantennary species. Placental transferrin receptor from donor B predominantly carried triantennary N-acetyllactosaminic glycans without fucose and hybrid-type oligosaccharides with four or five mannose residues. Distinct from placental transferrin receptor, the receptor from Hep G2 cells contained larger amounts of oligomannosidic glycans with six to nine mannose residues and tetrasialylated complex-type oligosaccharides apart from mono-, di- and trisialylated species." @default.
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- W1965679362 date "1992-04-01" @default.
- W1965679362 modified "2023-09-25" @default.
- W1965679362 title "Structure of the N-linked oligosaccharides of the human transferrin receptor" @default.
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- W1965679362 doi "https://doi.org/10.1111/j.1432-1033.1992.tb16776.x" @default.
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