通过内核膜酸酶复合体抑制TGF-β/SMAD信号传递
Zhe Ji1, Wing-Yan Skyla Siu1, Maria Emilia Dueñas2,3
1Sir William Dunn School of Pathology, University of Oxford, Oxford, UK.
Nature communications
|April 11, 2025
概括
转化生长因子-β (TGF-β) 信号通过核内受体调节的SMADs (R-SMADs) 的脱酸化被禁用. 一个MAN1-CTDNEP1-NEP1R1复合体调解了这一关键的R-SMAD失活.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 信号传导传导是指信号的传导.
背景情况:
- 转化生长因子-β (TGF-β) 超级家族的细胞因子通过受体调节的SMAD (R-SMAD) 转录因子调节细胞命运.
- R-SMAD激活涉及细胞质酸化,导致核积累和下游信号传输.
- 在核中R-SMAD失活的机制对于正确的信号终止至关重要.
研究的目的:
- 阐明细胞核内通过脱化脱R-SMAD失活的基础分子机制.
- 为了确定负责R-SMAD脱的特定酸酶.
- 为了研究脚手架蛋白 MAN1 在这种无活化过程中的作用.
主要方法:
- 蛋白相互作用的结构预测和域映射.
- 位点定向突变发生,以评估蛋白质功能.
- 分析R-SMAD局部化和信号活动,以应对复杂的干扰.
主要成果:
- R-SMAD脱化是由一个涉及MAN1和CTDNEP1-NEP1R1酸酶的内核膜复合体介导的.
- MAN1充当了支架,独立地与CTDNEP1-NEP1R1和R-SMAD结合,以促进R-SMAD的失活.
- 破坏MAN1-CTDNEP1-NEP1R1复合体导致异常的核R-SMAD积累和信号,即使没有TGF-β刺激.
- 与疾病相关的MAN1突变损害了这种非活化过程.
结论:
- CTDNEP1-NEP1R1被确定为关键的R-SMAD酸酶.
- MAN1-CTDNEP1-NEP1R1复合体为TGF-β信号失活提供了机制基础.
- 这个复合体的功能障碍,特别是由于MAN1突变,导致异常的细胞信号和疾病.
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