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. 1986 Aug;59(2):411–419. doi: 10.1128/jvi.59.2.411-419.1986

Molecular characterization of Marek's disease herpesvirus B antigen.

R J Isfort, I Sithole, H J Kung, L F Velicer
PMCID: PMC253091  PMID: 3016305

Abstract

The Marek's disease herpesvirus (MDHV) B antigen (MDHV-B) was identified and molecularly characterized as a set of three glycoproteins of 100,000, 60,000, and 49,000 apparent molecular weight (gp100, gp60, and gp49, respectively) by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) after immunoprecipitation from [35S]methionine-labeled infected cells by specific rabbit antiserum directed against MDHV-B (R alpha B), as previously determined by immunodiffusion. Further identification was accomplished by blocking this immunoprecipitation with highly purified MDHV-B. The same set of three polypeptides was also immunoprecipitated from [35S]methionine- and 14C-labeled infected cells with two other sera shown to have anti-B activity, i.e., rabbit anti-MDHV-infected-cell plasma membrane (R alpha PM) and immune chicken serum from birds naturally infected with MDHV. The three herpesvirus of turkeys (HVT) B-antigen (HVT-B) glycoproteins immunoprecipitated with all three sera containing anti-B activity were also shown to be identical in size to those of MDHV-B by immunoprecipitation and SDS-PAGE. These data serve to clarify the molecular identification of the polypeptides found in common between MDHV and HVT by linking them to MDHV-B, previously identified only by immunodiffusion, and to a similarly sized set of immunologically related common glycoproteins called gp100, gp60, and gp49, detected with monoclonal antibody by other workers. Tunicamycin inhibition of N-linked glycosylation resulted in either nonglycosylated or O-linked glycosylated putative precursors of MDHV-B and HVT-B with apparent molecular weights of 88,000, called pr88, and 44,000, tentatively called pr44, both immunoprecipitable with all three sera. However, the relationships of these two polypeptides to each other and to the overall precursor-processing relationship of the MDHV-B complex remains to be elucidated. The three fully glycosylated B-antigen polypeptides were not connected by disulfide linkage. Collectively, the data presented here and by others support the conclusion that all three glycoproteins now identified as gp100, gp60, and gp49 have MDHV-B determinants. Finally, detection of the same three polypeptides with well-absorbed R alpha PM, which was directed against purified infected-cell plasma membranes, suggests that at least one component of the B-antigen complex has a plasma membrane location in the infected cell.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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