Abstract
Glycosylation of the envelope glycoprotein of vesicular stomatitis virus was examined using virus-infected HeLa cells that were pulse-labeled with radioactive sugar precursors. The intracellular sites of glycosylation and the stepwise elongation of the carbohydrate side chains of the G protein were monitored by membrane fractionation and gel filtration of Pronase-digested glycopeptides. The results with short pulses of sugar label (5 to 10 mtein linkage (glucosamine and mannose) are added to G which was associated with the rough endoplasmic reticulum-enriched membrane fraction, whereas the more distal sugars (galactose, sialic acid, fucose, and possibly more glucosamine) are added in the light-density internal membrane fraction. Accumulation of mature G was observed in the plasma membrane-enriched fraction. The gel filtration studies indicated that the initial glycosylation event may be the en bloc addition of a mannose and glucosamine oligomer, followed by the stepwise addition of the more distal sugars.
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Selected References
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