Abstract
Cell lines were established by co-transfection of cloned M-ABA Epstein-Barr virus (EBV) DNA fragments with plasmids conferring resistance to dominant selective markers. A baby hamster kidney cell line carrying the HindIII-I1 fragment exhibits a nuclear antigen of 82 000 daltons, serologically defined as EBV-determined nuclear antigen (EBNA) 1. Furthermore, a Rat-1 cell line transfected with DNA of the clone pM 780-28 containing three large internal repeats (BglII-U) and the adjacent BglII-C fragment expresses a nuclear antigen of 82 000 daltons which can be visualized only by a subset of anti EBNA-positive human sera. Sera recognizing the 82 000-dalton protein of the transfected cell line reacted with a protein of the same size in the non-producer line Raji, designated as EBNA 2. Conversely, sera without reactivity to the 82 000-dalton protein failed to react with EBNA 2 of Raji cells. P3HR-1 and Daudi cells with large deletions in BglII-U and -C are devoid of EBNA 2. The data presented provide evidence that a second EBNA protein is encoded by the region of the EBV genome which is deleted in the non-transforming P3HR-1 strain.
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Selected References
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