The Epstein-Barr nuclear antigen 3A (EBNA3A) is one of only six viral proteins essential for Epstein-Barr virus-induced transformation of primary human B cells in vitro. Viral proteins such as EBNA3A are able to interact with cellular proteins, manipulating various biochemical and signalling pathways to initiate and maintain the transformed state of infected cells. EBNA3A has been reported to have one nuclear-localization signal and is targeted to the nucleus during transformation, where it associates with components of the nuclear matrix. By using enhanced green fluorescent protein-tagged deletion mutants of EBNA3A in combination with site-directed mutagenesis, an additional five functional nuclear-localization signals have been identified in the EBNA3A protein. Two of these (aa 63-66 and 375-381) were computer-predicted, whilst the remaining three (aa 394-398, 573-578 and 598-603) were defined functionally in this study.
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