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• W1974384968 abstract "The elements that regulate O-glycosylation are poorly understood. We have developed a novel in vivo system to analyze the role of flanking sequence on the modification of a single well characterized O-glycosylation site derived from human von Willebrand factor (PHMAQVTVGPGL). A secreted chimeric reporter protein, containing the human von Willebrand factor sequence, an antibody recognition epitope, and a heart muscle kinase site, was engineered and expressed in COS7 and MCF-7 cells. Glycosylated and non-glycosylated forms of the immunoprecipitated reporter were resolved electrophoretically and their relative amounts quantitated. Using mutational analysis we find that the glycosylation apparatus of COS7 cells can accommodate a broad range of changes in the flanking sequence without compromising glycosylation, but that the distribution of charged amino acids flanking the O-glycosylation site can have a profound influence on glycosylation with position −1 relative to the glycosylation site being particularly sensitive. A combination of acidic residues at positions −1 and +3 almost completely eliminates glycosylation of the reporter in both COS7 and MCF-7 cells. The overall density of charged amino acids is less important since substitution of acidic residues at position −2, +1, and +2 had no effect in the level of glycosylation observed. The elements that regulate O-glycosylation are poorly understood. We have developed a novel in vivo system to analyze the role of flanking sequence on the modification of a single well characterized O-glycosylation site derived from human von Willebrand factor (PHMAQVTVGPGL). A secreted chimeric reporter protein, containing the human von Willebrand factor sequence, an antibody recognition epitope, and a heart muscle kinase site, was engineered and expressed in COS7 and MCF-7 cells. Glycosylated and non-glycosylated forms of the immunoprecipitated reporter were resolved electrophoretically and their relative amounts quantitated. Using mutational analysis we find that the glycosylation apparatus of COS7 cells can accommodate a broad range of changes in the flanking sequence without compromising glycosylation, but that the distribution of charged amino acids flanking the O-glycosylation site can have a profound influence on glycosylation with position −1 relative to the glycosylation site being particularly sensitive. A combination of acidic residues at positions −1 and +3 almost completely eliminates glycosylation of the reporter in both COS7 and MCF-7 cells. The overall density of charged amino acids is less important since substitution of acidic residues at position −2, +1, and +2 had no effect in the level of glycosylation observed." @default.
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• W1974384968 date "1996-03-01" @default.
• W1974384968 modified "2023-10-04" @default.
• W1974384968 title "Charge Distribution of Flanking Amino Acids Influences O-Glycan Acquisition in Vivo" @default.
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• W1974384968 doi "https://doi.org/10.1074/jbc.271.12.7061" @default.
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