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The Journal of Immunology, Vol 138, Issue 2 593-599, Copyright © 1987 by American Association of Immunologists

ARTICLES

The glycine-alanine repeating region is the major epitope of the Epstein-Barr nuclear antigen-1 (EBNA-1)

H Rumpold, GH Rhodes, PL Bloch, DA Carson and JH Vaughan

The Epstein-Barr nuclear antigen-1 (EBNA-1) is a protein containing a large glycine-alanine repeat that has been shown to be antigenic. Antibodies to EBNA-1 can be detected by means of immunoblotting. Preincubation of antisera with purified EBNA-1 protein inhibits the binding of IgG antibodies in this system, indicating that those epitopes detected by immunoblots are also accessible on the native molecule. A number of synthetic peptides the sequences of which were derived from the glycine-alanine repeating region of EBNA-1 and from regions adjacent to it also inhibited antibody binding to EBNA-1. These showed, however, a 1000-fold variation in their inhibitory activities. Peptides containing only glycine and alanine were the most effective inhibitors. The anti-EBNA-1 antibodies did not react with several other peptides representing sequences from unrelated proteins. At saturating concentrations of peptide 85 to 100% of anti-EBNA-1, antibody binding was inhibited in all sera tested with one exception. Similar results are obtained when antibody binding is assayed by an enzyme immunosorbent assay by using partially purified EBNA-1 to coat the plates. Thus the glycine-alanine region, either through its primary structure or through conformations assumed by this region, forms the major epitope(s) of the EBNA-1 molecule.


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D. Lang, R. Vornhagen, M. Rothe, W. Hinderer, H.-H. Sonneborn, and B. Plachter
Cross-Reactivity of Epstein-Barr Virus-Specific Immunoglobulin M Antibodies with Cytomegalovirus Antigens Containing Glycine Homopolymers
Clin. Vaccine Immunol., July 1, 2001; 8(4): 747 - 756.
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