转录因子与NIPBL/MAU2形成三元复合体,以在增强剂上定位凝聚蛋白
Gregory Fettweis1, Kaustubh Wagh2, Diana A Stavreva2
1Laboratory of Gene Expression and Cancer, GIGA-Molecular & Computational Biology, University of Liège, 4000 Liège, Belgium.
Nucleic acids research
|May 16, 2025
概括
凝聚素加载器NIPBL (NIPBL/MAU2) 对增强剂的局部化是由转录因子相互作用介导的. 在NIPBL中的特定LxxLL基因结合MAU2和类固醇受体,如葡萄糖皮质体受体 (GR),影响基因调节.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 凝聚体复合体对于基因组架构至关重要.
- 凝聚素复合物的定位到特定的染色质位点的机制尚不清楚.
- 转录因子相互作用被假设为引导凝聚力加载器 (NIPBL/MAU2) 到增强剂.
研究的目的:
- 阐明NIPBL在染色体定位中的作用.
- 为了在NIPBL中确定负责转录因子相互作用的特定动机.
- 了解基因调节中NIPBL-转录因子复合体的结构基础.
主要方法:
- 在NIPBL中识别LxxLL图案.
- 生物化学试验研究NIPBL-MAU2异构体的形成.
- AlphaFold2和分子对接用于三元复合体的结构分析.
- 对依赖NIPBL的转录程序的分析.
主要成果:
- 在NIPBL中确定了两个LxxLL图案集群,调节其动态和互动组.
- 一个集群对于NIPBL-MAU2异构体稳定性至关重要.
- 第二个集群中介于与类固醇受体连接体结合域的结合,以葡萄糖皮质体受体 (GR) 为例.
- 一个三元复合体GR-NIPBL-MAU2的结构特征和显示为GR-依赖基因调节的重要.
结论:
- 对增强剂的NIPBL局部化通过通过特定的LxxLL动机与转录因子的直接相互作用来调解.
- 这些相互作用对于维持NIPBL-MAU2复合体和将其招募到特定的基因组部位至关重要.
- 这些发现提供了关于转录因子 (如GR) 如何参与凝聚蛋白加载器来调节基因表达的结构性见解.
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