Selective induction of discrete epitopes of herpes simplex virus type 1-specified glycoprotein C by interference with terminal steps in glycosylation.
We have described two types of oligosaccharide modification influencing the antigenicity of the herpes simplex virus type 1 (HSV-1)-specified glycoprotein C (gC-1). First, the expression of several epitopes belonging to antigenic site II of gC-1 is dependent on the peripheral galactose of N-linked oligosaccharides. We have also shown that treatment of HSV-1-infected cells with 5-n-propyl-2'-deoxyuridine (PdU) under certain circumstances results in other modifications of peripheral carbohydrate determinants, which are associated with increased antigenic activity of gC-1. In the present study we have mapped and characterized the epitopes susceptible to PdU induction by analysing the reactivity to a number of monoclonal antibodies defining several epitopes of antigenic sites I and II. The results indicate that the strict galactose dependence of epitopes and the PdU-induced increase of antigenic activity are independent and unrelated phenomena. Thus, we identified galactose-dependent epitopes that were not PdU-inducible and vice versa, and some epitopes were both galactose-dependent and PdU-inducible. The results support a model where PdU treatment blocks synthesis of an antigen-masking carbohydrate determinant. In addition, PdU treatment of HSV-1-infected cells seemed to increase the antigenic activity of other HSV-1 glycoproteins.
Olofsson
S
S
Department of Clinical Virology, University of Göteborg, Sweden.
Sjöblom
I
I
Glorioso
J C
JC
Jeansson
S
S
Datema
R
R
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000956:Antigens, Viral / Q000276:immunology* / Q000378:metabolism; D002460:Cell Line; D003857:Deoxyuridine / Q000494:pharmacology; D000939:Epitopes; D006031:Glycosylation; D010504:Periodic Acid; D015531:Radioimmunoprecipitation Assay; D018139:Simplexvirus / Q000276:immunology* / Q000502:physiology; D014759:Viral Envelope Proteins / Q000276:immunology* / Q000378:metabolism; D014779:Virus Replication
D000911:Antibodies, Monoclonal; D000956:Antigens, Viral; D000939:Epitopes; D014759:Viral Envelope Proteins; C038535:glycoprotein gC, herpes simplex virus type 1; D010504:Periodic Acid; C009288:metaperiodate; D003857:Deoxyuridine