Mps1是脊椎动物线粒检查点中必不可少的一种与kinetochore相关的激酶
A Abrieu1, L Magnaghi-Jaulin, J A Kahana
1Ludwig Institute for Cancer Research, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
Cell
|July 20, 2001
概括
线粒检查点确保细胞分裂前适当的染色体附着. 一种称为Mps1的激酶对于这个检查点至关重要,它在Mad2上游起作用,以调节细胞循环的进展.
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:
- 线粒检查点通过确保所有染色体都附着在螺杆微管中来防止过早的亚纳相发作.
- 据认为,未连接的基内托可释放激活的Mad2,抑制酶促进复合物/环体 (APC/C) 并延迟酶所需的蛋白解.
研究的目的:
- 调查脊椎动物Mps1同类在建立和维持线粒体检查点中的作用.
- 为了确定Mps1在Mad2介导的信号通路中的位置.
主要方法:
- 实验中使用了Xenopus蛋提取物进行实验.
- 评估了Mps1的激酶活性,以评估其在检查点功能中的必要性.
- 研究了Mps1枯竭对Mad2和CENP-E局部化的影响.
主要成果:
- 一种脊椎动物的Mps1同类基因作为基因关联激酶,对线粒检查点至关重要.
- Mps1在Mad2-介导的APC/C抑制的上游作用,因为高的Mad2水平在Mps1-贫乏的提取物中挽救检查点损失.
- 对于CENP-E在kinetochore的招募和保留,Mps1是必需的,这对于Mad1和Mad2的kinetochore关联至关重要.
结论:
- 对于建立和维护线性检查点,Mps1激酶活性是不可或缺的.
- Mps1在Mad2的上游运作,在抑制APC/C.C.的kinetochore-dependent信号通路中发挥关键作用.
- 在CENP-E的招募中,Mps1的作用对于随后的Mad1和Mad2的动态本地化至关重要,从而确保了细胞周期的适当调节.
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