Stimulation of human insulin receptor gene expression by retinoblastoma gene product.

Stimulation of human insulin receptor gene expression by retinoblastoma gene product.
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视网膜母细胞瘤基因产物刺激人胰岛素受体基因表达。

DOI:
10.1074/jbc.270.35.20525
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发表时间:
1995
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
Tsai,SY
Tsai,SY
中科院分区:
--
文献类型:
--
作者:
Shen,WJ;Kim,HS;Tsai,SY

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多个顺式作用元件已被定义为对人胰岛素受体(hIR)基因表达的转录调节很重要。我们在这里报告,这些元件之一还介导视网膜母细胞瘤基因产物(Rb)对 hIR 启动子活性的刺激。负责 Rb 刺激的顺式元件定位于位于 hIR 基因的 -643 至 -607 之间的 GA 和 GC 盒。我们之前已经证明这些 GA 和 GC 盒以高亲和力结合 Sp1,并负责 E1a 激活 hIR 启动子活性。这些序列的突变完全消除了 hIR 启动子活性的 Rb 依赖性增强。此外,我们定位了 Rb N 端结构域中的三个区域参与 hIR 启动子活性的刺激。我们的结果代表了首批证明 Rb N 末端多个磷酸化位点具有功能重要性的研究之一。最后,介绍了 Rb 激活 hIR 启动子的机制。
Multiple cis-acting elements have been defined to be important for the transcriptional regulation of the human insulin receptor (hIR) gene expression. We report here that one of these elements also mediated the stimulation of hIR promoter activity by the retinoblastoma gene product (Rb). The cis-element responsible for Rb stimulation was localized to the GA and GC boxes situated between −643 to −607 of the hIR gene. We have previously demonstrated that these GA and GC boxes bind Sp1 with high affinity and are responsible for E1a activation of hIR promoter activity. Mutation of these sequences completely abolished Rb-dependent enhancement of hIR promoter activity. In addition, we localized three regions in the N-terminal domain of Rb to be involved in stimulation of hIR promoter activity. Our results represent one of the first studies to demonstrate a functional importance assigned to the multiple phosphorylation sites in the N terminus of Rb. Finally, the mechanism by which Rb activates the hIR promoter are presented.
该信号序列足以直接输出大肠杆菌K-12的外膜蛋白OmpA
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