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O-linked glycosylation of the mucin domain of the herpes simplex virus type 1 specific glycoprotein gC-1 is temporally regulated in a seed-and-spread manner.

Journal article
Authors Rickard Nordén
Adnan Halim
Kristina Nyström
Eric P Bennett
Ulla Mandel
Sigvard Olofsson
Jonas Nilsson
Göran Larson
Published in The Journal of biological chemistry
Volume 290
Issue 8
Pages 5078-5091
ISSN 1083-351X
Publication year 2015
Published at Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine
Institute of Biomedicine, Department of Infectious Medicine
Pages 5078-5091
Language en
Links dx.doi.org/10.1074/jbc.M114.616409
Subject categories Clinical virology, Virology, Chemistry, Infectious Medicine, Clinical Laboratory Medicine

Abstract

The herpes simplex virus type 1 (HSV-1) glycoprotein gC-1, participating in viral receptor interactions and immunity interference, harbors a mucin-like domain with multiple clustered O-linked glycans. Using HSV-1 infected diploid human fibroblasts, an authentic target for HSV-1 infection, and a protein immunoaffinity procedure, we enriched fully glycosylated gC-1 and a series of its biosynthetic intermediates. This fraction was subjected to trypsin digestion and a LC-MS/MS glycoproteomics approach. In parallel, we characterized the expression patterns of the 20 isoforms of human GalNAc transferases responsible for initiation of O-linked glycosylation. The gC-1 O-glycosylation was regulated in an orderly manner initiated by synchronous addition of one GalNAc unit each to T87 and T91, and one GalNAc unit to either T99 or T101, forming a core glycopeptide for subsequent additions of in all 11 GalNAc residues to selected Ser and Thr residues of the T76-L107 stretch of the mucin domain. The expression patterns of GalNAc transferases in the infected cells suggested that initial additions of GalNAc were carried out by initiating GalNAc transferases, in particular GalNAc-T2, whereas subsequent GalNAc additions were carried out by follow up transferases, in particular GalNAc-T10. Essentially all of the susceptible Ser or Thr residues had to acquire their GalNAc units before any elongation to longer O-linked glycans of the gC-1-associated GalNAc units was permitted. Since the GalNAc occupancy pattern is of relevance for receptor binding of gC-1, the data provides a model to delineate biosynthetic steps of O-linked glycosylation of the gC-1 mucin domain in HSV-1 infected target cells.

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