热力学原理将体外转录因子亲缘关系与细胞中单分子染色质状态联系起来
Julia M Schaepe1, Torbjörn Fries2, Benjamin R Doughty3
1Bioengineering Department, Stanford University, Stanford, CA 94305, USA.
bioRxiv : the preprint server for biology
|February 20, 2025
概括
了解转录因子 (TF) 结合需要知道DNA序列背景如何影响TF搜索和占用. 这项研究量化了TF结合动力学和红色素克鲁佩尔样因子 (KLF1) 的体内占用率.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 生物物理学的生物物理.
背景情况:
- 对转录因子 (TF) 结合和色素可访问性的定量理解是有限的.
- 关键问题包括序列上下文对亲和关系的影响,TF DNA搜索机制,TF占用动力学和动机语法协调.
- 红状腺克鲁佩尔样因子 (eKLF/KLF1) 是人类的一个TF,对红细胞发育至关重要.
研究的目的:
- 量化研究eKLF/KLF1结合和染色质占用的分子机制.
- 为了将体外生物物理测量与体内TF和核细胞组动力学相关联.
- 开发基于序列和生物物理参数的TF结合的预测模型.
主要方法:
- 高通量体外TF结合率和亲和力测试.
- 在生物单分子TF和核酶体占用量测量工程DNA序列.
- 应用线性能量和热力学模型来分析具有约束力的数据.
主要成果:
- 边缘DNA序列显著调节TF亲和力,影响TF搜索参数.
- 动机识别概率是亲和力变化的主要驱动因素,而不是居住时间.
- 在体外和体内观察到一致的TF停留时间分钟.
- 生物物理参数准确地预测了新型动机语法中的体内染色质状态.
结论:
- 侧面序列在调节转录因子结合亲和力和搜索动态方面发挥着至关重要的作用.
- 试管生物物理测量为预测体内TF行为提供了坚实的基础.
- 综合生物物理数据的热力学建模可以根据动机语法准确预测色素状态.
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