HURP controls spindle dynamics to promote proper interkinetochore tension and efficient kinetochore capture.

HURP controls spindle dynamics to promote proper interkinetochore tension and efficient kinetochore capture.
复制标题

DOI:
10.1083/jcb.200511132
复制
发表时间:
2006-06-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Fang G
Fang G
中科院分区:
其他
文献类型:
--
作者:
Wong J;Fang G

文献摘要

参考文献

被引文献

相似文献

通过有丝分裂调节因子的功能基因组筛选,我们确定肝癌上调蛋白(HURP)是染色体会聚和排列所需的蛋白质。在 HURP 耗尽的细胞中,未对齐染色体的持续存在和对齐染色体上姐妹动粒张力的降低导致纺锤体检查点的激活。尽管这些缺陷暂时延迟了有丝分裂进程,但 HeLa 细胞在没有解决这些缺陷的情况下启动了后期。这种检查点停滞的旁路为染色体错误分离和基因组不稳定提供了肿瘤特异性机制。从机制上讲,HURP 与有丝分裂纺锤体共定位,浓度梯度向染色体增加。 HURP 在体外直接与微管结合并增强其聚合。在体内,HURP稳定有丝分裂微管,促进微管聚合和双极纺锤体形成,并降低有丝分裂纺锤体的周转率。因此,HURP 控制纺锤体的稳定性和动力学,以实现前期有效的动粒捕获、及时的染色体会聚到中期板以及后期启动时适当的动粒间张力。
Through a functional genomic screen for mitotic regulators, we identified hepatoma up-regulated protein (HURP) as a protein that is required for chromosome congression and alignment. In HURP-depleted cells, the persistence of unaligned chromosomes and the reduction of tension across sister kinetochores on aligned chromosomes resulted in the activation of the spindle checkpoint. Although these defects transiently delayed mitotic progression, HeLa cells initiated anaphase without resolution of these deficiencies. This bypass of the checkpoint arrest provides a tumor-specific mechanism for chromosome missegregation and genomic instability. Mechanistically, HURP colocalized with the mitotic spindle in a concentration gradient increasing toward the chromosomes. HURP binds directly to microtubules in vitro and enhances their polymerization. In vivo, HURP stabilizes mitotic microtubules, promotes microtubule polymerization and bipolar spindle formation, and decreases the turnover rate of the mitotic spindle. Thus, HURP controls spindle stability and dynamics to achieve efficient kinetochore capture at prometaphase, timely chromosome congression to the metaphase plate, and proper interkinetochore tension for anaphase initiation.
DOI: 10.1101/gad.245603
发表时间: 2003-02-01
影响因子: 10.5
作者:
Gergely, F;Draviam, VM;Raff, JW
通讯作者: Raff, JW
DOI: 10.1073/pnas.081076898
发表时间: 2001-04-10
影响因子: 11.1
作者:
Skoufias, DA;Andreassen, PR;Margolis, RL
通讯作者: Margolis, RL
DOI: 10.1126/science.1105103
发表时间: 2005-02-04
期刊: SCIENCE
影响因子: 56.9
作者:
de Lichtenberg, U;Jensen, LJ;Bork, P
通讯作者: Bork, P
DOI: 10.1038/ng1434
发表时间: 2004-10-01
期刊: NATURE GENETICS
影响因子: 30.8
作者:
Segal, E;Friedman, N;Regev, A
通讯作者: Regev, A
响应染色体单向化的检查点延迟后期是由未连接的动物学产生的抑制信号介导的。
DOI: 10.1083/jcb.130.4.941
发表时间: 1995-08
影响因子: 7.8
作者:
RIEDER, CL;COLE, RW;KHODJAKOV, A;SLUDER, G
通讯作者: SLUDER, G