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- W2056575357 abstract "We recently reported that the transferrin receptor (TfR) contains O-linked GalNAc residues [1]. To investigate whether this modification is shared by transferrin receptors in other mammals, we investigated the glycosylation of TfR in hamster cells. To facilitate our analysis the lectin-resistant Chinese hamster ovary (CHO) cell line Lec8 was used. These cells are unable to galactosylate glycoproteins, resulting in truncation of the Ser/Thr-linked oligosaccharides to a single residue of terminal α-linked GalNAc. This structure is bound with high affinity by the lectin Helix pomatia agglutinin (HPA). The TfR was affinity purified from Lec8 cells metabolically radiolabeled with [3H]glucosamine and the receptor was found to bind tightly to HPA-Sepharose. Treatment of the purified TfR with mild alkalne/borohydride released [3H]GalNAcitol, demonstrating the presence of O-linked GalNAc. We also found that many other unidentified [3H]glucosamine-labeled glycoproteins from Lec8 cells were bound by HPA-Sepharose. The bound and unbound glycoproteins were separated by SDS/PAGE and individual species were selected for treatment with mild base/borohydride. Treatment of glycoproteins bound by HPA, but not those unbound, resulted in the release of [3H]GalNAcitol. These studies demonstrate both that the hamster TfR contains O-linked oligosaccharides and that this approach may have general utility for identifying the presence of these oligosaccharides in other glycoproteins." @default.
- W2056575357 created "2016-06-24" @default.
- W2056575357 creator A5023341393 @default.
- W2056575357 creator A5033521535 @default.
- W2056575357 date "1992-01-01" @default.
- W2056575357 modified "2023-09-28" @default.
- W2056575357 title "The hamster transferrin receptor contains Ser/Thr-linked oligosaccharides: use of a lectin-resistant CHO cell line to identify glycoproteins containing these linkages" @default.
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- W2056575357 doi "https://doi.org/10.1016/0165-022x(94)90068-x" @default.
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