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Gordadze, A.V.* ; Onunwor, C.W.* ; Peng, R.S.* ; Poston, D.* ; Kremmer, E. ; Ling, P.D.*

EBNA2 amino acids 3 to 30 are required for induction of LMP-1 and immortalization maintenance.

J. Virol. 78, 3919-3929 (2004)

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Epstein-Barr virus (EBV) nuclear antigen 2 (EBNA2), a direct transcriptional activator of viral and cellular genes, is required for EBV-induced B-cell transformation. The functional role of conserved regions within the amino terminus of the protein preceding the poly-proline region has yet to be fully characterized. Thus, we tested whether the EBNA2 amino-terminal 30 amino acid residues, containing evolutionarily conserved region 1, are required for stimulating viral and cellular gene expression necessary for B-cell transformation in a viral transcomplementation assay. We found that these residues are required for its ability to induce LMP-1 expression in lymphoblastoid cell lines (LCLs), to stimulate LMP-1 promoter reporter plasmids in transient-cotransfection assays, and to rescue LCL growth following inactivation of endogenous wild-type EBNA2 protein. Deletion of amino acid residues 3 to 30 also impaired its ability to self-associate in coimmunoprecipitation assays. These data indicate that EBNA2 residues 3 to 30 comprise an essential domain required for induction of LMP-1 expression and, consequently, for maintenance of the immortalized phenotype of LCLs. The ability to self-associate into dimers or multimers conferred by this domain may be an important mechanism for these effects.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

ISSN (print) / ISBN 0022-538X

e-ISSN 1098-5514

Journal Journal of Virology

Quellenangaben Volume: 78, Issue: 8, Pages: 3919-3929

Publisher American Society for Microbiology (ASM)

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Molecular Immunology (IMI)