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To determine the particular intracellular steps in the glycosylation of the vesicular stomatitis virus (VSV) glycoprotein that were altered in several lectin-resistant CHO cell lines, VSV-infected parental and mutant cells were pulse-labeled for 30 and 120 min with [3H]mannose and [3H]glucosamine. Cell-associated viral glycopeptides were analyzed by gel filtration combined with specific glycosidase digestions and compared with the corresponding mature virion oligosaccharides. The intracellular glycosylation of the VSV glycoprotein in a mutant cell line resistant to phytohemagglutinin was identical to that in the normal cells except for a complete block in processing at a specific step in the final trimming of the oligomannosyl core from five to three mannoses. The results demonstrated that a double-mutant cell line selected from the phytohemagglutinin-resistant cells for resistance to concanavalin A had an additional defect in one of the earliest stages of glycosylation, resulting in smaller precursor oligosaccharides linked to protein.

journal of virology

Altered synthesis and processing of oligosaccharides of vesicular stomatitis virus glycoprotein in different lectin-resistant Chinese hamster ovary cell lines