通过Lem4对激酶和酸酶活动的协调,可以在线粒分裂过程中重新组装核外
Claudio Asencio1, Iain F Davidson, Rachel Santarella-Mellwig
1European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
Cell
|July 10, 2012
概括
核外改造需要去化BAF蛋白. 保存的蛋白质Lem4/LEM-4L通过抑制酶和与酸酶相互作用来调节这一过程,确保适当的细胞分裂.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 核外 (NE) 的拆卸和重新组装是元生动物中细胞分裂过程中的关键事件.
- 蛋白质BAF (障碍自一体化因子) 的线性酸化破坏了它与染色质和内核膜蛋白的相互作用,促进了NE的分解.
- 在线细胞退出期间BAF脱酸化的精确调节,对于NE重组至关重要,仍然在很大程度上是未知的.
研究的目的:
- 为了研究控制 BAF 脱化过程中的调控机制在线索性退出.
- 为了确定参与BAF脱化和随后的核外改造的蛋白质.
- 阐明Lem4/LEM-4L在核外动态中的保留功能.
主要方法:
- 利用模型生物C. elegans和人类细胞系.
- 调查了LEM-4L及其人体正方体Lem4 (ANKLE2) 在BAF脱化中的作用.
- 进行了体内和体外实验,以分析Lem4/LEM-4L与激酶 (VRK-1) 和酶 (PP2A) 的相互作用.
主要成果:
- LEM-4L和Lem4对于 BAF 在线粒退出过程中的脱化至关重要.
- Lem4/LEM-4L抑制了线粒激酶VRK-1对BAF的活性.
- 4/LEM-4L与酸酶PP2A相互作用,并且对于酸酶PP2A去酸化BAF而言是必需的.
- 通过Lem4/LEM-4L的协调调节,确保了适当的转移后核膜的形成.
结论:
- 4/LEM-4L作为BAF脱的关键调节者,集成来自酶和酸酶通路的信号.
- 在控制核外重组的Lem4/LEM-4L的功能是保存跨物种,从C.elegans到人类.
- 了解Lem4/LEM-4L的作用,可以了解细胞分裂和核膜动态的基本过程.
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