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Wnt目标基因激活需要将β-catenin分离成生物分子凝聚物
Richard A Stewart1, Zhihao Ding1, Ung Seop Jeon1
1Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America.
PLoS biology
|September 24, 2024
概括
在β-catenin本质上混乱的区域中的芳香残留物对于形成Wnt/β-catenin信号传递和基因调节所必需的生物分子凝聚物 (BMC) 至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
背景情况:
- Wnt/β-catenin通路对于干细胞的发育和维护至关重要.
- β-catenin作为转录的共同激活剂,需要核积累激活基因.
- β-catenin形成分相生物分子凝聚物 (BMC),可能与其功能有关.
研究的目的:
- 研究β-catenin生物分子凝聚物 (BMCs) 在Wnt目标基因调节中的作用.
- 探索在β-catenin的内在失序区域 (IDR) 中芳香氨基酸残留物对BMC形成和信号的贡献.
- 阐明β-catenin BMCs调节Wnt信号传递的机制.
主要方法:
- 在体外和细胞培养实验中评估β-catenin和LEF1 BMCs的可混合性.
- 在人类细胞和Drosophila melanogaster中具有改变芳香残留的β-catenin突变的特征.
- 分析Wnt目标基因激活,核进口和突变细胞中的蛋白质-蛋白质相互作用.
主要成果:
- β-catenin BMCs与LEF1 BMCs混合,支持Wnt信号传输中的作用.
- 在N端和C端的IDR中,芳香残留物对于β-catenin的BMC形成和Wnt信号活动至关重要.
- 破坏BMC形成的突变减少了所有测试的Wnt目标的激活,而不会影响核进口或对合作伙伴有约束力.
- 之前与信号无关的N端IDR对于Wnt读数和BMC形成至关重要.
结论:
- β-catenin形成核生物分子凝聚物 (BMC) 的能力与其作为Wnt通路中的转录协调器的功能密切相关.
- 在β-catenin的IDRs中的芳香残留是BMC形成和下游Wnt信号的关键决定因素.
- 这些发现提供了阶段分离和转录通过β-catenin调节之间的机制联系.
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