Abstract
A correlation between Epstein-Barr virus membrane antigen (MA) and three surface glycoproteins has been established on the basis of radio-immunoprecipitation and immunoabsorption experiments. For radio-immunoprecipitation, Epstein-Barr virus-infected cells were radiolabeled either with neuraminidase-galactose oxidase tritiated borohydride, a procedure highly specific for surface glycoproteins, or with a general tritiated amino acid mixture. Intact cells were incubated with MA(−) or MA(+) human sera, washed free of unbound immunoglobulins, and then lysed with Nonidet P-40. The antigen-antibody complexes were bound to protein A-Sepharose and after elution with sodium dodecyl sulfate were analyzed by acrylamide gel electrophoresis in sodium dodecyl sulfate. MA(+) sera specifically precipitated three glycoproteins with molecular weights of 236,000, 212,000, and 141,000 from B95-8 cells induced with 12-O-tetradecanoylphorbal-13-acetate (TPA) and from Raji cells superinfected with P3HR-1 virus. These glycoproteins were not detected on Epstein-Barr virus-negative Ramos cells treated with TPA or on B95-8 cells treated simultaneously with TPA and phosphonoacetic acid. Soybean lectin-Sepharose bound all three glycoproteins, and lectin-Sepharose-bound glycoproteins from TPA-induced P95-8 cells absorbed MA-specific antibody from MA(+) human sera. The data strongly suggest that either all three glycoproteins have MA determinants or they are part of a complex in which one or more of the components constitute the reactive antigen.
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Selected References
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