UMMS Affiliation

Department of Molecular Genetics and Microbiology

Date

4-1-1997

Document Type

Article

Subjects

Amino Acid Sequence; Animals; Binding Sites; COS Cells; Cysteine; Disulfides; Glycosylation; HN Protein; Molecular Sequence Data; Newcastle disease virus; Protein Folding; Rabbits; Recombinant Fusion Proteins

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Determinants of glycosylation site usage were explored by using the hemagglutinin-neuraminidase (HN) glycoprotein of the paramyxovirus Newcastle disease virus. The amino acid sequence of the HN protein, a type II glycoprotein, has six N-linked glycosylation addition sites, G1 to G6, two of which, G5 and G6, are not used for the addition of carbohydrate (L. McGinnes and T. Morrison, Virology 212:398-410, 1995). The sequence of this protein also has 13 cysteine residues in the ectodomain (C2 to C14). Mutation of either cysteine 13 or cysteine 14 resulted in the addition of another oligosaccharide chain to the protein. These cysteine residues flank the normally unused G6 glycosylation addition site, and mutation of the G6 site eliminated the extra glycosylation found in the cysteine mutants. These results suggested that failure to form an intramolecular disulfide bond resulted in the usage of a normally unused glycosylation site. This conclusion was confirmed by preventing cotranslational disulfide bond formation in cells by using dithiothreitol. Under these conditions, the wild-type protein acquired extra glycosylation, which was eliminated by mutation of the G6 site. These results suggest that localized folding events on the nascent chain, such as disulfide bond formation, which block access to the oligosaccharyl transferase are a determinant of glycosylation site usage.

Rights and Permissions

Citation: J Virol. 1997 Apr;71(4):3083-9.

Related Resources

Link to Article in PubMed

Journal Title

Journal of virology

PubMed ID

9060670

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