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• W1967701644 abstract "Abstract Previous studies in our laboratory have characterized 3′-azido-3′-deoxythymidine (AZT) as a potent inhibitor of glycosphingolipid biosynthesis in cultured cells (Steet, R., Alizadeh, M., Melancon, P., and Kuchta, R. D. (1999) Glycoconj. J. 16, 237–245; Yan, J.-P., Ilsley, D. D., Frohlick, C., Steet, R., Hall, E. T., Kuchta, R. D., and Melancon, P. (1995) J. Biol. Chem. 270, 22836–22841). Here, we report that AZT treatment of K562 cells results in significant alterations in the profile of N-linked oligosaccharides. Fractionation of [3H]mannose-labeled oligosaccharides from AZT-treated K562 cells using lectin affinity chromatography revealed striking changes in the branching and processing ofN-linked glycoconjugates. AZT treatment resulted in the production of fewer highly branched complex glycans (60% of control at 20 μm AZT) and a significant accumulation of core-fucosylated biantennary oligosaccharides. In addition, extension of branched oligosaccharides with multiple poly-N-acetyllactosamine repeats is nearly abolished by AZT concentrations as low as 2 μm. A shift from multiantennary to moderately branched oligosaccharides was also apparent in the melanoma cell line SK-MEL-30 upon AZT treatment.N-Linked glycans from both cell lines exhibited increased affinity for the β-galactoside-binding lectin RCA-I in the presence of AZT, suggesting that the addition of terminal sialic acid is sensitive to the drug. These results demonstrate the ability of AZT to modulate strongly the processing of asparagine-linked glycoconjugates in whole cells and reveal a novel mechanism by which AZT treatment may cause anemia." @default.
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• W1967701644 date "2000-06-06" @default.
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• W1967701644 title "3'-Azidothymidine potently Inhibits the biosynthesis of highly branched N-linked oligosaccharides and poly-N-acetyllactosamine chains in cells" @default.
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• W1967701644 doi "https://doi.org/10.1074/jbc.m004038200" @default.
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