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Lysine residues of Epstein–Barr virus-encoded nuclear antigen 2 do not confer secondary modifications via ubiquitin or SUMO-like proteins but modulate transcriptional activation

Institut für Mikrobiologie und Hygiene, Abteilung Virologie, Haus 47, Universitätskliniken, 66421 Homburg/Saar, Germany¹

Author for correspondence: Friedrich Grässer. Fax +49 6841 162 3980. e-mail graesser{at}uniklinik-saarland.de

Epstein–Barr virus nuclear antigen 2 (EBNA2) is essential for transformation through activation of viral and cellular genes. Within 487 residues, EBNA2 contains six lysine (K) residues (positions 335, 357, 359, 363, 366 and 480), which were mutated to arginine (R) residues, either individually or in combination, and tested for subcellular localization, mobility by SDS–PAGE and transactivation of three promoters. All mutants featuring the K⁴⁸⁰R mutation within the nuclear localization signal were partially cytoplasmic with a reduced level of transactivation of the latent membrane protein 1 (LMP1) promoter (-327 to +40). The K³⁶⁶R mutation also showed a decrease in transactivation of a promoter consisting only of 12 recombination signal-binding protein-J-binding sites, while all mutants with the K³³⁵R exchange showed a markedly elevated transactivation with the -327 to +40 construct and all mutants showed slightly reduced transactivation with a -634 to +40 LMP1 promoter. None of the mutants exhibited altered migration in SDS–PAGE, excluding secondary modification, i.e. through SUMO-like proteins.