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Differential control of transcription by homologous homeodomain coregulators.

机译:同源同源结构域调节剂对转录的差异控制。

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The human herpes simplex virus type 1 (HSV-1) transactivator VP16 and its homolog from bovine herpes-virus 1 (BHV-1) can each recruit the human homeodomain protein Oct-1 into a transcriptional regulatory complex. Here, we show that these two Oct-1 coregulators possess similar, if not identical, homeodomain recognition properties but possess different virus-specific cis-regulatory specificities: the HSV-1 VP-16 protein activates transcription from the HSV-1 VP16 response element, and the BHV-1 VP16 protein activates transcription from the BHV-1 VP16 response element. A distinct 3-bp segment, the D segment, lying 3' of the canonical TAATGARAT motif (where R is a purine) in the VP16 response element is responsible for the differential cis element recognition and transcriptional activation by these two homeodomain coregulators. These results demonstrate how a single homeodomain protein can direct differential transcriptional regulation by selective association with homologous homeodomain coregulators.
机译:人类单纯疱疹病毒1型(HSV-1)反式激活因子VP16及其来自牛疱疹病毒1(BHV-1)的同系物均可将人类同源域蛋白Oct-1募集到转录调控复合物中。在这里,我们显示这两个Oct-1调节剂具有相似的同源域识别特性,但不相同,但具有不同的病毒特异性顺式调节特异性:HSV-1 VP-16蛋白激活HSV-1 VP16响应元件的转录,并且BHV-1 VP16蛋白激活BHV-1 VP16反应元件的转录。 VP16响应元件中位于规范TAATGARAT基序(其中R为嘌呤)3'处的独特的3 bp片段D片段负责这两个同源域共调节子对顺式元件的区别识别和转录激活。这些结果证明了单个同源结构域蛋白如何通过与同源同源结构域核心调节剂的选择性结合来指导差异转录调控。

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