Abstract
The Epstein-Barr virus (EBV)-associated membrane antigen polypeptides (350,000, 220,000, 140,000, and 85,000 daltons) are recognized by a rabbit anti-EBV serum and are present on the plasma membranes of producer cell lines, as we demonstrated previously. In this report, we show that these polypeptides are present on intact virus particles. Subcellular fractionation revealed that these antigens are distributed throughout the cell, except for the 85,000-dalton protein, which was poorly represented in the nuclear fraction. In addition, an EBV-associated protein of 160,000 daltons, which comigrates with a major component of the viral capsid, was detected in the cytoplasmic and nuclear fractions. The immunoprecipitation patterns of 13 different EBV isolates were similar, with two exceptions. First, the 350,000- and 220,000-dalton polypeptides from marmoset cell lines had slightly larger molecular sizes than the corresponding polypeptides from human cell lines. Second, B95-8 virus and B95-8-derived human and marmoset cell lines contained little of the 220,000-dalton protein; however, 883L, the human parent line of B95-8, has a normal amount of the 220,000-dalton protein. Thus, the B95-8 strain of EBV appears to be a structurally defective variant. We have not observed any variation in protein patterns associated with different EBV disease states. The 350,000-, 220,000-, and 85,000-dalton polypeptides were shown to be glycoproteins by incorporation of [3H]mannose and [3H]glucosamine and to contain N-asparagine-linked glycosyl groups by their sensitivity to tunicamycin. To simplify future work, the following nomenclature for these EBV-associated polypeptides is suggested: 350,000 (gp350), 220,000 (gp220), 160,000 (p160), 140,000 (p140), and 85,000 (gp85).
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