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- W1513898424 abstract "Previously, we reported that incorporation of threo-beta-fluoroasparagine into cellular protein inhibits N-linked glycosylation. We now show that short synthetic peptides which contain N-acetyl-threo-beta-fluoroasparagine fail to undergo glycosylation in a cell-free system except at extremely high substrate concentrations. An N-benzoyl-threo-beta-fluoroasparagine-containing peptide has a 100-fold lower Vmax/Km than the analogous N-benzoyl-asparagine-containing peptide. Substitution of a fluorine for a hydrogen on the beta-carbon of asparagine weakens the ability of the peptide to bind the oligosaccharyltransferase. A 100-fold excess of acetyl-threo-beta-fluoroasparaginyl-leucyl-threonine methylamide over acetyl-asparaginyl-leucyl-threonine methylamide inhibited glycosylation of the latter peptide by less than 10%. Both threo-beta-fluoroasparagine and erythro-beta-fluoroasparagine-containing peptides are glycosylated at the same rate. Glycofluoropeptides generated from beta-fluoroasparagine-containing peptides were N-glycosylated. These cell-free studies with synthetic fluoropeptides suggest that incorporation of beta-fluoroasparagine into cellular protein inhibits N-linked glycosylation by rendering protein substrates ineffective for glycosylation. In the course of this work, we also demonstrate that the N-linked glycosylating enzyme acts only on L-asparagine-containing peptides and not on D-asparagine peptides." @default.
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- W1513898424 date "1986-05-01" @default.
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- W1513898424 title "Incorporation of beta-fluoroasparagine into peptides prevents N-linked glycosylation. In vitro studies with synthetic fluoropeptides." @default.
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- W1513898424 doi "https://doi.org/10.1016/s0021-9258(19)84585-4" @default.
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