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We have examined and compared the host-cell-dependent glycosylation of the G glycoprotein of vesicular-stomatitis virus (Hazelhurst strain) and the E1 and E2 glycoproteins of Sindbis virus replicated by baby-hamster kidney, chicken-embryo fibroblast and mouse L929 monolayer cell cultures. The results of endo-beta-N-acetylglucosaminidase H digestion of viral proteins labelled with [3H]mannose or leucine and Pronase-digested glycopeptides labelled with [3H]mannose indicated that both the G protein and the E1 protein contained a similar mixture of endoglycosidase-resistant oligosaccharides of the complex acidic type and less extensively processed endoglycosidase-sensitive oligosaccharides of the neutral or hybrid type, with a relatively greater content of the endoglycosidase-sensitive oligosaccharides for virus replicated in the chicken as against hamster or mouse cells. A large fraction of the G protein and the majority of the E1 proteins from the mammalian host cells contained acidic-type oligosaccharides at both glycosylation sites, whereas most of the G and E1 glycoproteins from the avian host cells and essentially all of the E2 protein from all three host-cell types contained an acidic-type oligosaccharide at one site and neutral- or hybrid-type oligosaccharide at the other site. The relative increase in neutral- and hybrid-type oligosaccharides with five-mannose core structures observed for the G and E1 proteins of virus released from the avian host cells suggested that two specific steps in oligosaccharide processing (mediated by alpha-mannoside II and N-acetylglucosaminyltransferase I) were less efficient at one of the glycosylation sites of the vesicular-stomatitis-virus G protein and Sindbis-virus E1 protein in the avian as against mammalian host cells.

Hazelhurst-vesicular-stomatitis-virus G and Sindbis-virus E1 glycoproteins undergo similar host-cell-dependent variation in oligosaccharide processing