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Cell Division
How Cells Verify Chromosome Spindle Attachment
Description
The spindle assembly checkpoint helps cells verify that chromosomes are attached to the spindle before division continues. It acts as a safety step during cell division and helps prevent errors in chromosome separation.
This checkpoint is controlled by kinetochores, which are protein structures o...
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Transcript
纺锤体组装检查点是一种监控从中期向后期过渡的监控机制。
该检验点可确保所有染色体正确连接到有丝分裂纺锤体的相对两极。在所有染色体实现双定向之前,该检验点会延迟后期的启动,通过感知着丝粒动粒内部产生的张力,从而 防止染色体过早或错误地分离。
动粒-纺锤体连接的缺失会导致动粒外层与内层之间产生极小的张力。这种不足的张力水平会生成一个被纺锤体组装检查点通路所感知的负信号。
这种负信号促进有丝分裂检验点通路组分Mad2向未附着的动粒募集。未附着的动粒催化Mad2发生构象改变,从而激活该蛋白。活化的Mad2与其他检验点通路组分结合,形成有丝分裂检验点复合物(mitotic checkpoint complex, MCC)。
MCC 与 Cd...
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