对增长因子响应转录因子复合体的功能分析
1Transcription Laboratory, Imperial Cancer Research Fund, London, England.
Cell
|April 23, 1993
概括
血清反应因子 (SRF) 和Elk-1蛋白相互作用对于基因调节至关重要. 修改后的SRF和Elk-1蛋白恢复了突变基因促进者的功能,证明了它们在转录中的合作作用.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 蛋白质与蛋白质之间的相互作用
背景情况:
- 血清反应因子 (SRF) 是一种转录因子,它与c-fos血清反应元素 (SRE) 结合.
- SRF与辅助因子Elk-1合作,在SRE中形成一个三元复合体.
- 目前正在调查SRF和Elk-1在转录调节中的精确功能合作.
研究的目的:
- 调查SRF和Elk-1在转录调节中的功能合作.
- 确定特定蛋白质域和修饰在SRF-Elk-1复合体形成和活性中的作用.
- 为了证明SRF和Elk-1的改变结合特异性衍生物可以恢复突变SRE的活性.
主要方法:
- 构建SRF和Elk-1的改变结合特异性衍生品.
- 用SRF和Elk-1衍生物感染细胞,以评估突变SRE的活性.
- 对依赖于Elk-1酸化和特定SRF序列的转录激活的分析.
主要成果:
- 工程 SRF 和 Elk-1 衍生品在一个突变的,不活跃的 SRE.形成了一个三元复合体.
- 这些衍生物的同时表达恢复了对突变的SRE的血清调节活性.
- 转录激活依赖于Elk-1酸化和参与三元复合体形成的特定SRF域.
结论:
- SRF和Elk-1在SRE的三元复合体内功能合作,调节基因转录.
- 在SRF中的特定域和Elk-1的酸化状态对于这种合作转录激活至关重要.
- 这些发现提供了SRF和Elk-1之间的功能协同作用的直接证据.
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