核包装组装依赖CHMP-7在没有BAF-LEM介导的孔封闭的情况下
Sarah R Barger1, Lauren Penfield2, Shirin Bahmanyar1
1Yale University, Department of Molecular, Cellular, Developmental Biology, 266 Whitney Ave., New Haven, CT 06511.
bioRxiv : the preprint server for biology
|July 18, 2023
概括
在C. elegans中,阻碍自身整合因子 (BAF) 和LEM域蛋白在二次变异过程中冗余地封闭核外 (NE) 孔. BAF-LEM结合和LEMD2-CHMP7的不同作用确保了NE的完整性,并防止了组件的故障.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 屏障与自集成因子 (BAF) 交叉链接染色素用于核包膜 (NE) 组装后线粒分裂.
- BAF还与LEM域蛋白相互作用,以修复相间NE断裂.
- LEMD2-CHMP7适配器封闭了线粒状微管周围的NE孔,但BAF-LEM的参与尚不清楚.
研究的目的:
- 调查BAF-LEM结合和LEMD2-CHMP7在C. elegans卵细胞中二次变异后核包裹密封中的作用.
- 确定这些因素对围绕螺旋微管周围的NE孔封闭的明显贡献.
主要方法:
- 在C. elegans卵细胞中核封闭的分析,介质变化后II.
- 研究BAF-LEM结合和LEMD2-CHMP7功能的研究.
- 对NE透性屏障维护和NE组装的评估.
主要成果:
- BAF-LEM结合和LEM-2/CHMP-7在螺旋微管周围的NE孔封闭中具有不同的作用.
- LEM-2/EMR-1 (emerin) 与BAF-1一起冗余地运行,以封闭NE.
- 受损的BAF-LEM结合揭示了EMR-1在NE透性中的作用和LEM-2-CHMP-7在防止NE组件故障中的作用.
- LEM-2的WH域招募CHMP-7,而LEM-2独立的池也对NE稳定性有所贡献.
结论:
- 围绕螺旋微管的核外孔闭合涉及冗余机制.
- 这些机制防止NE组装故障,支持胚胎发生.
- BAF-LEM相互作用和LEMD2-CHMP7的功能是合作的,并且可以保持NE的完整性.
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