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Four EBNA2 Domains Are Important for EBNALP Coactivation

Department of Medicine and Microbiology and Molecular Genetics, Channing Laboratory, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts

Received 6 March 2004/ Accepted 28 May 2004

EBNA2 transcriptional activation and regulated EBNALP coactivation are critical for Epstein-Barr virus-infected primary B-lymphocyte growth transformation. EBNALP coactivation requires the EBNA2 acidic activation domain (E2AD); EBNALP can bind to E2AD. EBNALP has now been found to bind less well to EBNA2 amino acids 1 to 58, which has been identified to be a second transcriptional activation domain, E2AD2. E2AD2 was specifically coactivated by EBNALP. Moreover, E2AD, E2AD2, EBNA2 RG domain, and the intermediate domain between RG and E2AD had significant roles in EBNA2-mediated activation and EBNALP coactivation.

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