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Appearance of Early and Late Components of Epstein-Barr Virus-Associated Membrane Antigen in Daudi Cells Superinfected with P3HR-1 Virus

T. Sekizawa

M. Yoshida

^* Department of Microbiology, Kumamoto University Medical School, Kumamoto, 860
Department of Microbiology, Tohoku University School of Dentistry, Sendai, 980
Department of Pediatrics, Wakayama Medical College, Wakayama, 640 Japan

This study investigated the synthesis of membrane antigen (MA) as well as virus capsid antigen (VCA) and early antigen (EA) in Daudi cells which had been superinfected with the P3HR-1 strain of Epstein-Barr virus (EBV) and then treated with trypsin to remove initially absorbed MA-positive material from the cell surface. Synthesis of MA, VCA and EA was completely inhibited by puromycin. A marked reduction in the frequency of MA positive cells was observed in superinfected cells cultured in the presence of either cytosine arabinoside (Ara-C) or phosphonoacetate (PA); however, a small fraction of MA synthesis occurred, suggesting an inhibitor insensitive component in MA. A differential absorption of EBV antibody-positive human serum with the Ara-C treated or untreated infected cells detected two antigenically different components in MA: early (Ara-C insensitive) and late (Ara-C sensitive) MA.

Received 4 May 1977; accepted 29 July 1977.