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. 1977 Aug;23(2):217–226. doi: 10.1128/jvi.23.2.217-226.1977

Carbohydrates of Influenza Virus. I. Glycopeptides Derived from Viral Glycoproteins After Labeling with Radioactive Sugars

Ralph T Schwarz 1, Michael F G Schmidt 1, Ursula Anwer 1, Hans-Dieter Klenk 1
PMCID: PMC515823  PMID: 886648

Abstract

The carbohydrate moiety of the influenza glycoproteins NA, HA1, and HA2 were analyzed by labeling with radioactive sugars. Analysis of glycopeptides obtained after digestion with Pronase indicated that there are at least two different types of carbohydrate side chains. The side chain of type I is composed of glucosamine, mannose, galactose, and fucose. It is found on NA, HA1, and HA2. The side chain of type II contains a high amount of mannose and is found only on NA and HA2. The molecular weights of the corresponding glycopeptides obtained from virus grown in chicken embryo cells are 2,600 for type I and 2,000 for type II. The glycoproteins of virus grown in MDBK cells have a higher molecular weight than those of virus grown in chicken embryo cells, and there is a corresponding difference in the molecular weights of the glycopeptides. Under conditions of partial inhibition of glycosylation, virus particles were isolated that contained hemagglutinin with reduced carbohydrate content. Glycopeptide analysis indicated that this reduction is due to the lack of whole carbohydrate side chains and not to the incorporation of incomplete ones. This observation suggests that glycosylation of the viral glycoproteins involves en bloc transfer of the core sugars to the polypeptide chains.

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Selected References

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