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In Epstein-Barr virus (EBV)-carrying nonproducer Raji cells, the induction of the viral replicative cycle by chemical treatment is limited to only the early stage and viral DNA synthesis is totally inhibited. We previously showed the absence of two messenger RNAs that are encoded by the BamHI-A fragment of the EBV genome and that correspond to open reading frames BALF2 and BARF1 in chemically induced Raji cells. Since the BALF2 gene encodes a 135-kDa DNA-binding protein which was immunoprecipitated by antibody against ICP8 protein, a key protein in herpes simplex virus replication, we asked whether the lack of productive cycle in Raji cells is due to the absence of expression of the BALF2 gene. We transfected the Raji cell line with the BALF2 gene. After chemical induction, the BALF2-transfected cells expressed not only early antigens but also late antigens. In these cultures, the viral particles were detected by electron microscopy. The expression of late antigens was completely inhibited by arabinofuranosylthymine, which is a specific inhibitor of viral DNA replication. The BALF2 gene might play an essential role in the induction of the EBV-lytic cycle.

journal of virology

The lytic cycle of Epstein-Barr virus in the nonproducer Raji line can be rescued by the expression of a 135-kilodalton protein encoded by the BALF2 open reading frame