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Journal of Virology, April 2005, p. 4506-4509, Vol. 79, No. 7
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.7.4506-4509.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Epstein-Barr Virus with the Latent Infection Nuclear Antigen 3B Completely Deleted Is Still Competent for B-Cell Growth Transformation In Vitro
Adrienne Chen,
Matthew DiVisconte,
Xiaoqun Jiang,
Carol Quink, and
Fred Wang*
Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
Received 1 October 2004/
Accepted 23 November 2004
The Epstein-Barr virus (EBV) nuclear antigen 3B (EBNA-3B) is considered nonessential for EBV-mediated B-cell growth transformation in vitro based on three virus isolates with EBNA-3B mutations. Two of these isolates could potentially express truncated EBNA-3B products, and, similarly, we now show that the third isolate, IB4, has a point mutation and in-frame deletion of 263 amino acids. In order to test whether a virus with EBNA-3B completely deleted can immortalize B-cell growth, we first cloned the EBV genome as a bacterial artificial chromosome (BAC) and showed that the BAC-derived virus was B-cell immortalization competent. Deletion of the entire EBNA-3B open reading frame from the EBV BAC had no adverse impact on growth of EBV-immortalized B cells, providing formal proof that EBNA-3B is not essential for EBV-mediated B-cell growth transformation in vitro.
* Corresponding author. Mailing address: Channing Laboratory, 181 Longwood Ave., Boston, MA 02115. Phone: (617) 525-4258. Fax: (617) 525-4257. E-mail:
fwang{at}rics.bwh.harvard.edu.
Journal of Virology, April 2005, p. 4506-4509, Vol. 79, No. 7
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.7.4506-4509.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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