O-linked glycosylation of retroviral envelope gene products.

Abstract:

:Treatment of [3H]glucosamine-labeled Friend mink cell focus-forming virus (FrMCF) gp70 with excess peptide:N-glycanase F (PNGase F) resulted in removal of the expected seven N-linked oligosaccharide chains; however, approximately 10% of the glucosamine label was retained in the resulting 49,000-Mr (49K) product. For [3H]mannose-labeled gp70, similar treatment led to removal of all the carbohydrate label from the protein. Prior digestion of the PNGase F-treated gp70 with neuraminidase resulted in an additional size shift, and treatment with O-glycanase led to the removal of almost all of the PNGase F-resistant sugars. These results indicate that gp70 possesses sialic acid-containing O-linked oligosaccharides. Analysis of intracellular env precursors demonstrated that O-linked sugars were present in gPr90env, the polyprotein intermediate which contains complex sugars, but not in the primary translation product, gPr80env, and proteolytic digestion studies allowed localization of the O-linked carbohydrates to a 10K region near the center of the gp70 molecule. Similar substituents were detected on the gp70s of ecotropic and xenotropic murine leukemia viruses and two subgroups of feline leukemia virus, indicating that O-linked glycosylation is a conserved feature of retroviral env proteins.

journal_name

J Virol

journal_title

Journal of virology

authors

Pinter A,Honnen WJ

doi

10.1128/JVI.62.3.1016-1021.1988

subject

Has Abstract

pub_date

1988-03-01 00:00:00

pages

1016-21

issue

3

eissn

0022-538X

issn

1098-5514

journal_volume

62

pub_type

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