Spatiotemporal control of mitosis by the conserved spindle matrix protein Megator.

Spatiotemporal control of mitosis by the conserved spindle matrix protein Megator.
复制标题

DOI:
10.1083/jcb.200811012
复制
发表时间:
2009-03-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Maiato H
Maiato H
中科院分区:
其他
文献类型:
--
作者:
Lince-Faria M;Maffini S;Orr B;Ding Y;Cláudia Florindo;Sunkel CE;Tavares A;Johansen J;Johansen KM;Maiato H

文献摘要

参考文献

被引文献

相似文献

假设纺锤体基质介导染色体运动,但其存在和功能仍有争议。在这篇报告中,我们发现Megator (Mtor),与人类核孔复合体蛋白易位启动子区(Tpr)对应的果蝇黑ogaster蛋白,和纺锤体组装检查点(SAC)蛋白Mad2形成一个保守复合体,定位于活细胞中核衍生的纺锤体基质。光漂白实验后的荧光恢复支持Mtor保留在纺锤体微管周围,在纺锤体微管周围表现出明显的动态特性。Mtor/Tpr促进Mad2和Mps1向无附着着丝点(KTs)募集,而不是Mad1,介导正常的有丝分裂持续时间和SAC反应。在后期,Mtor参与纺锤体伸长,从而影响正常的染色体运动。我们提出Mtor/Tpr作为SAC的空间调节因子,它确保了Mad2在有丝分裂开始时有效地招募到未附着的kt和适当的纺锤体成熟,而纺锤体基质中Mad2的富集有助于将扩散的“等待后期”信号的作用限制在纺锤体附近。
A putative spindle matrix has been hypothesized to mediate chromosome motion, but its existence and functionality remain controversial. In this report, we show that Megator (Mtor), the Drosophila melanogaster counterpart of the human nuclear pore complex protein translocated promoter region (Tpr), and the spindle assembly checkpoint (SAC) protein Mad2 form a conserved complex that localizes to a nuclear derived spindle matrix in living cells. Fluorescence recovery after photobleaching experiments supports that Mtor is retained around spindle microtubules, where it shows distinct dynamic properties. Mtor/Tpr promotes the recruitment of Mad2 and Mps1 but not Mad1 to unattached kinetochores (KTs), mediating normal mitotic duration and SAC response. At anaphase, Mtor plays a role in spindle elongation, thereby affecting normal chromosome movement. We propose that Mtor/Tpr functions as a spatial regulator of the SAC, which ensures the efficient recruitment of Mad2 to unattached KTs at the onset of mitosis and proper spindle maturation, whereas enrichment of Mad2 in a spindle matrix helps confine the action of a diffusible “wait anaphase” signal to the vicinity of the spindle.
DOI: 10.1083/jcb.200712028
发表时间: 2008-06-16
期刊: The Journal of cell biology
影响因子: --
作者:
Tighe A;Staples O;Taylor S
通讯作者: Taylor S
染色体运动和主轴矩阵。
DOI: 10.1083/jcb.99.1.137s
发表时间: 1984-07
影响因子: 7.8
作者:
Pickett-Heaps, J;Spurck, T;Tippit, D
通讯作者: Tippit, D
DOI: 10.1111/j.1469-7580.2005.00407.x
发表时间: 2005-05-01
期刊: JOURNAL OF ANATOMY
影响因子: 2.4
作者:
McCullough, S;Lucocq, J
通讯作者: Lucocq, J
DOI: 10.1091/mbc.e05-01-0011
发表时间: 2005-09-01
影响因子: 3.3
作者:
Scott, RJ;Lusk, CP;Wozniak, RW
通讯作者: Wozniak, RW
DOI: 10.1091/mbc.e08-03-0324
发表时间: 2009-01-01
影响因子: 3.3
作者:
Xu, Quanbin;Zhu, Songcheng;Liu, Xuedong
通讯作者: Liu, Xuedong