Schwarzmann, F. and Prang, N. and Reichelt, B. and Rinkes, B. and Haist, S. and Marschall, M. and Wolf, Hans J. (1994) Negatively cis-acting elements in the distal part of the promoter of Epstein-Barr virus trans-activator gene BZLF1. The Journal of general virology 75 ( P, pp. 1999-2006.
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Epstein-Barr virus (EBV) replicates in a latent or a lytic way in the infected organism, depending on the type and level of differentiation of the host cell. The switch between latency and lytic replication was previously shown, for Burkitt's lymphoma cell lines, to depend on the viral BZLF1 gene product. Protein-DNA assays were used to identify the cis-acting elements that represent the link between regulating signal transduction pathways and the viral cascade of gene expression. Specific binding of proteins to several sites of the BZLF1 promoter during latency was shown. Induction of the lytic cycle by stimulation with 12-O-tetradecanoyl-phorbol 13-acetate abolished the binding of these proteins to the distal promoter (positions -227 to -551), suggesting a functional role for the down-regulation of promoter activity during latency. Computer analysis identified a multiply repeated sequence motif, HI, in this region and exonuclease III footprints confirmed that these sites act as specific protein recognition sites. Using a set of reporter plasmids we were able to demonstrate a negative regulatory effect of the HI motif in some B lymphoid cell lines, in contrast to epithelial HeLa cells. The HI silencer elements are different from other silencer elements described so far in respect of their sequence and protein-binding pattern during the activation of BZLF1.
|Institutions:||Medicine > Lehrstuhl für Medizinische Mikrobiologie und Hygiene|
|Subjects:||600 Technology > 610 Medical sciences Medicine|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||06 Apr 2011 10:04|
|Last Modified:||21 Jul 2011 04:10|
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