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Variable methylation of the Epstein-Barr virus Wp EBNA gene promoter in B-lymphoblastoid cell lines 总被引:1,自引:0,他引:1
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Elliott J Goodhew EB Krug LT Shakhnovsky N Yoo L Speck SH 《Journal of virology》2004,78(24):14062-14065
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Host cell and EBNA-2 regulation of Epstein-Barr virus latent-cycle promoter activity in B lymphocytes. 总被引:5,自引:2,他引:3
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C M Rooney M Brimmell M Buschle G Allan P J Farrell J L Kolman 《Journal of virology》1992,66(1):496-504
The six latent-cycle nuclear antigens (EBNAs) of Epstein-Barr virus (EBV), whose genes share 5' leader exons and two promoters (Cp and Wp), are differentially expressed by cells of the B lineage. To examine the possibility that EBNA gene expression is regulated through selective use of Cp and Wp, we monitored the activity of promoter-chloramphenicol acetyltransferase (CAT) gene constructs transfected into EBV-positive and EBV-negative B lymphocytes and Burkitt's lymphoma cells. Wp was a much stronger promoter than Cp in EBV genome-negative B-cell lines and was used exclusively in primary B cells. When B cells were infected with transforming EBV, Cp became the stronger promoter. This switch was not observed when B cells were infected with an immortalization-deficient virus, P3HR-1, which lacks the EBNA-2 open reading frame and expresses a mutant leader protein (EBNA-LP). Cp function was transactivated when EBV-negative or P3HR-1-infected B cells were cotransfected with Cp and a 12-kb fragment of DNA (BamHI-WWYH) that spanned the P3HR-1 deletion. This activity was mapped to the EBNA-2 gene within WWYH; constructs expressing EBNA-LP did not induce Cp function, and the deletion of 405 bp from the EBNA-2 open reading frame abolished transactivation. This research demonstrates host cell and EBNA-2 regulation of latent-cycle promoter activity in B lymphocytes, a mechanism with implications for persistence of EBV-infected lymphoid cells in vivo. 相似文献
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The Epstein-Barr virus (EBV) early promoter DR contains a cis-acting element responsive to the EBV transactivator EB1 and an enhancer with constitutive and inducible activities. 总被引:19,自引:15,他引:4
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P Chavrier H Gruffat A Chevallier-Greco M Buisson A Sergeant 《Journal of virology》1989,63(2):607-614
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Identification of critical cis elements involved in mediating Epstein-Barr virus nuclear antigen 2-dependent activity of an enhancer located upstream of the viral BamHI C promoter. 总被引:8,自引:5,他引:3
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The six genes encoding the Epstein-Barr virus nuclear antigens (EBNAs) are transcribed from one of two promoters, BamHI C promoter (Cp) or BamHI W promoter (Wp), located near the left end of the viral genome. During the establishment of viral latency in B lymphocytes, Wp is used exclusively before a switch to Cp usage. We and others have previously identified an enhancer in the region upstream of Cp which requires EBNA 2 for activity (M. Woisetschlaeger, X. W. Jin, C. N. Yandava, L. A. Furmanski, J. L. Strominger, and S. H. Speck, Proc. Natl. Acad. Sci. USA 88:3942-3946, 1991; N. S. Sung, S. Kenney, D. Gutsch, and J. S. Pagano, J. Virol. 65:2164-2169, 1991). Infection of B lymphocytes with a mutant virus lacking the EBNA 2 gene results in prolonged usage of Wp and failure to switch to Cp usage, indicating that EBNA 2 transactivation of the enhancer upstream of Cp may be critical for promoter switching. In this study, we have defined the minimal EBNA 2-dependent enhancer by using a series of deletion mutants. The results of site-directed mutagenesis revealed that there are three regions of the enhancer that are important for activity, two of which appear to bind B-lymphocyte-specific factors. 相似文献
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Day L Chau CM Nebozhyn M Rennekamp AJ Showe M Lieberman PM 《Journal of virology》2007,81(12):6389-6401
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