FMR1 KH0-KH1域坐标m6在脆弱X综合征中的A结合和相分离
Xian Zhou1, Chen-Jun Guo2, Rui Wang2
1State Key Laboratory of Cardiology and Medical Innovation Center, Department of Reproductive Medicine Center, Shanghai East Hospital, Frontier Science Center for Stem Cell Research, School of Life Sciences and Technology, Tongji University, Shanghai, 200092, China; School of Life Science and Technology, ShanghaiTech University, Shanghai, China.
脆弱的X信使核糖蛋白1 (FMR1) 域KH1结合m6ARNA,而KH0调节液-液相分离 (LLPS). KH0中的突变破坏了RNA结合,并导致异常的LLPS,将m6A与脆弱X综合征联系起来.
科学领域:
- 分子生物学分子生物学
- 神经科学是一个神经科学.
- 结构生物学 结构生物学
背景情况:
- 脆弱的X信使核糖蛋白1 (FMR1) 通过m6ARNA相互作用对神经发育至关重要.
- 在RNA结合和疾病发病过程中,FMR1的KH0和KH1域的特定作用尚不清楚.
研究的目的:
- 阐明KH0和KH1域在FMR1.1中的不同功能.
- 为了研究m6ARNA结合,液体-液体相分离 (LLPS) 和脆弱X综合征病原体之间的相互作用.
主要方法:
- 用于改变FMR1域内的特定氨基酸残留物,采用了位点导向的突变发生.
- 使用AlphaFold3结构建模和模拟来预测和分析蛋白质结构和相互作用.
- 进行液-液相分离 (LLPS) 试验,以评估突变和RNA修饰对FMR1行为的影响.
主要成果:
- 确定KH1域为m6ARNA结合的主要接口.
- 发现KH0域,特别是Arg138,可以调节FMR1的液体-液体相分离 (LLPS) 特性.
- 病原性突变在KH0中破坏了RNA结合,并诱导了异常的LLPS聚合,而m6A修饰的RNA在KH0中抑制了LLPS.
- 通过结构模拟,通过疏水和静电网络介导的KH0和KH1之间的协同相互作用被揭示出来.
结论:
- FMR1的KH1域是关键的m6ARNA结合部位,其KH0域调节LLPS.
- 由FMR1突变驱动的m6ARNA结合和异常LLPS的失调与脆弱X综合征有机械联系.
- FMR1 KH0域代表了由RNA调节和相分离影响的神经发育障碍的潜在治疗标.
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