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首页> 外文期刊>Virology >The truncated C-terminal E2 (E2-TR) protein of bovine papillomavirus (BPV) type-1 is a transactivator that modulates transcription in vivo and in vitro in a manner distinct from the E2-TA and E8?E2 gene products
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The truncated C-terminal E2 (E2-TR) protein of bovine papillomavirus (BPV) type-1 is a transactivator that modulates transcription in vivo and in vitro in a manner distinct from the E2-TA and E8?E2 gene products

机译:牛乳头瘤病毒(BPV)1型的截短的C端E2(E2-TR)蛋白是一种反式激活因子,以不同于E2-TA和E8?E2基因产物的方式在体内和体外调节转录

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摘要

The E2 open reading frame of bovine papillomavirus (BPV)-1 encodes a 410 amino acid (aa) transcriptional activator, E2-TA, and collinear polypeptides-E2-TR (243 aa) and E8?E2 (196 aa). E8?E2 and E2-TR share the DNA-binding domain of E2-TA, and both have been defined as transcriptional repressors. Although purified E2-TR and E8?E2 proteins specifically bound E2 sites with similar affinities, only the E2-TR stimulated transcription. Here we show that E2-TR trans-activates E2-dependent promoters 5 to 10-fold in cooperation with cellular factors and in a dose-dependent fashion in epithelial cells and fibroblasts of animal or human origin while E2-TA activated >100-fold and the E8?E2 had no effect. However, in contrast to E2-TA, E2-TR activated transcription from a promoter-proximal position. E2-TR also partially inhibited the BPV-1 P89 or heterologous promoters whereas E8?E2 led to complete repression. Thus, the BPV-1 E2-TR modulates viral gene expression in a manner distinct from other E2 proteins.
机译:牛乳头瘤病毒(BPV)-1的E2开放阅读框编码410个氨基酸(aa)的转录激活因子E2-TA和共线多肽-E2-TR(243aa)和E8?E2(196aa)。 E8→E2和E2-TR共享E2-TA的DNA结合结构域,并且都被定义为转录阻遏物。尽管纯化的E2-TR和E8?E2蛋白以相似的亲和力特异性结合E2位点,但只有E2-TR刺激转录。在这里,我们显示E2-TR与细胞因子合作并在动物或人类来源的上皮细胞和成纤维细胞中以剂量依赖的方式反激活E2依赖性启动子5至10倍,而E2-TA激活> 100倍而E8?E2没有作用。但是,与E2-TA相反,E2-TR会从启动子附近位置激活转录。 E2-TR也部分抑制了BPV-1 P89或异源启动子,而E8→E2导致完全抑制。因此,BPV-1 E2-TR以不同于其他E2蛋白的方式调节病毒基因的表达。

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