同因子结合唤起了霍克斯蛋白之间的DNA结合特异性的潜在差异
Matthew Slattery1, Todd Riley, Peng Liu
1Department of Biochemistry and Molecular Biophysics, Columbia University, 701 West 168(th) Street, HHSC 1104, New York, NY 10032, USA.
转录因子在与辅助因子形成复合物时获得新的DNA结合能力. 这项研究揭示了Drosophila Hox蛋白如何通过Extradenticle-Homothorax辅因子改变识别特性.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物化学 生物化学
背景情况:
- 转录因子家族具有相同的DNA结合相似性,但在体内有不同的功能.
- 转录因子通常将DNA结合为多蛋白质复合体,表明DNA结合特异性的改变.
研究的目的:
- 为了研究转录因子复合体的形成是否会改变DNA结合的特异性.
- 开发一种方法来确定转录因子复合体的DNA序列亲缘关系.
主要方法:
- 开发了SELEX-seq,一个实验和计算平台.
- 应用了SELEX-seq对所有八种Drosophila Hox蛋白和外-同胸部 (Exd) 辅因子.
主要成果:
- 当与Exd.复杂化时,Drosophila Hox蛋白质表现出新的DNA识别特性.
- 埃克斯-霍克斯特异性分为三个类,与霍克斯基因对齐.
- DNA结构预测表明,前后霍克斯蛋白质具有明显的小槽地形偏好.
结论:
- 协因子相互作用,如Exd与Hox蛋白,导致新兴的DNA识别特性.
- 这些新出现的特性有助于转录因子的体内特异性.
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