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On the role of oligosaccharide trimming in the maturation of sindbis and influenza virus

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Summary

The α-glucosidase inhibitor bromoconduritol inhibits the formation of the N-linked, complex-type oligosaccharides of the glycoproteins from influenza viruses (fowl plague virus, influenza virus PR-8) and from sindbis virus. Viral glycoproteins produced in bromoconduritol-treated chickenembryo and baby-hamster kidney cells are fully glycosylated, but accumulate N-linked, high-mannose oligosaccharides of the composition Glc1Manx (GlcNAc)2 (x=7, 8, and 9). Other α-glucosidase inhibitors (nojirimycin, deoxynojirimycin, acarbose) were not specific inhibitors of oligosaccharide processing under the conditions used in the present investigation.

In bromoconduritol-treated, sindbis virus-infected chicken-embryo and baby-hamster kidney cells, the sindbis glycoproteins are metabolically stable. Specific proteolytic cleavage of the polyprotein precursors to form E2 and E1 occurs in bromoconduritol-treated chicken-embryo cells, but cleavage of PE2 to E2 is prevented in the infected baby-hamster kidney cells. Yet, release of infectious sindbis virus particles is inhibited in both cell types indicating that the formation of complex oligosaccharides is required for a late step in virus formation.

The release of virus particles from influenza virus PR-8-infected bromoconduritol-treated chicken-embryo cells is not inhibited, and virus with only high-mannose oligosaccharides is formed. In contrast, when chickenembryo cells were infected with the influenza virus fowl plague virus, release of infectious particles was inhibited. The fowl plague virus hemagglutinin is cleaved in chicken-embryo cells, in contrast to the hemagglutinin of the PR-8 virus. However, the cleavage products HA1 and HA2 do not reach the cell surface. In addition, or as a consequence, HA1 and HA2 are proteolytically broken down, whereas uncleaved hemagglutinin of PR-8 appeared metabolically stable. These results may explain the decrease in formation of fowl plague virus particles and the lack of effect on PR-8 virus in bromoconduritol-treated cells. This work thus shows different biological roles for oligosaccharide processing.

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Authors and Affiliations

  1. Institut für Virologie, Justus-Liebig-Universität Giessen, Giessen, Germany

    R. Datema, P. A. Romero, R. Rott & R. T. Schwarz

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Datema, R., Romero, P.A., Rott, R. et al. On the role of oligosaccharide trimming in the maturation of sindbis and influenza virus. Archives of Virology 81, 25–39 (1984). https://doi.org/10.1007/BF01309294

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  • DOI: https://doi.org/10.1007/BF01309294

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