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β-catenin 作为一种分子适配器,用于失序的 cBAF 相互作用
Yuen San Chan1, Qinyu Gao1, Sarah A Robinson1
1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA; Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX 77030, USA.
Molecular cell
|July 22, 2025
概括
像β-catenin这样的支架蛋白作为分子适配器,将BAF (SWI/SNF) 染色体重塑剂与转录因子联系起来. 这种相互作用对于调节人类细胞中的基因可访问性和功能至关重要.
科学领域:
- 分子生物学分子生物学
- 染色体生物学 染色体生物学
- 基因规则 基因规则
背景情况:
- BAF (SWI/SNF) 复合体是关键的染色质重塑剂,通过与各种结合伙伴的相互作用来调节DNA可访问性.
- BAF与各种合作伙伴,特别是支架蛋白的相互作用的确切机制仍然不完全理解.
研究的目的:
- 研究脚手架蛋白质,特别是β-catenin (CTNNB1) 在调解BAF复合体和转录因子之间的相互作用中的作用.
- 阐明β-catenin如何桥接BAF和转录因子,如类固醇生成因子1 (SF-1,NR5A1) 的分子基础.
主要方法:
- 研究了BAF抑制对SF-1/β-catenin增强剂占用率和基因激活的影响.
- 利用分子可视化技术来检查蛋白质-蛋白质相互作用.
- 评估了β-catenin作为将BAF与多个转录因子 (包括YAP1,SOX2,FOXO3和CBP/p300) 联系起来的适配器的作用.
主要成果:
- BAF抑制破坏了SF-1/β-catenin增强剂的占用率,并影响了SF-1目标基因的激活.
- β-catenin作为一个分子适配器,将SF-1连接到BAF子单元ARID1A的内在无序区域 (IDR) 通过其Armadillo重复.
- 通过IDR介导的机制,Beta-catenin被确定为将BAF与其他因素联系起来的通用适配器,包括YAP1,SOX2,FOXO3和CBP/p300.
结论:
- β-catenin作为一个关键的分子适配器,促进BAF染色体重塑剂与多种转录因子的模块化协调.
- 这种适应机制涉及β-catenin和ARID1A的IDR,对于调节基因可访问性和转录结果至关重要.
- 这些发现揭示了本质上混乱的区域和适应蛋白如何在BAF互动组内实现动态相互作用的一般原则.
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