集体非结构性相互作用驱动着转录因子的染色质结合
Abrar A Abidi1, Gina M Dailey1,2, Robert Tjian1,2
1Department of Molecular and Cell Biology, University of California, Berkeley, United States.
bioRxiv : the preprint server for biology
|June 4, 2025
概括
转录因子 (TF) 使用内在失序区域 (IDR) 进行染色质结合和自我关联,而不仅仅是DNA结合域 (DBD). 这些IDR促进了广泛的合作相互作用,重新定义了活细胞中的TF特异性.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 细胞生物学 细胞生物学
背景情况:
- 细胞转录因子 (TFs) 具有结构化的DNA结合域 (DBDs) 和内在无序区域 (IDRs).
- 由于在活细胞中的测量挑战,IDRs在TF染色体结合和核组织中的功能尚不清楚.
研究的目的:
- 通过一种新的单分子技术,研究IDRs如何影响TF关联和染色质结合.
- 阐明IDRs在TF特异性和核组织中的作用.
主要方法:
- 利用近距离辅助光激活 (PAPA),一种单分子技术,研究活细胞中的TF相互作用.
- 专注于转录因子Sp1和Klf1,分析它们的自我关联和染色体结合.
主要成果:
- IDR残留物组成决定了TF自我结合和染色体结合.
- 隔离的Sp1 DBD对染色质的结合较弱;隔离的IDR显示与染色质结合的Sp1的相互作用较差,增强了DNA结合能力.
- 不同类型的DBD恢复了IDR相互作用和染色体关联,表明IDR通过短暂的DNA接触来调解广泛的合作性结合支架.
结论:
- IDR对于TF相互作用和染色体关联至关重要,挑战了TF特异性的经典模型.
- 活体内TF特异性来自DBD序列偏好和多种IDR介导相互作用的组合.
- PAPA是研究其本源细胞环境中的非结构化相互作用的强大工具.
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