Molecular control of kinetochore-microtubule dynamics and chromosome oscillations.
Molecular control of kinetochore-microtubule dynamics and chromosome oscillations.
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DOI:
10.1038/ncb2033
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发表时间:
2010-04
影响因子:
21.3
通讯作者:
Meraldi, Patrick
中科院分区:
文献类型:
--
作者:
Amaro, Ana C.;Samora, Catarina P.;Holtackers, Rene;Wang, Enxiu;Kingston, Isabel J.;Alonso, Maria;Lampson, Michael;McAinsh, Andrew D.;Meraldi, Patrick
Chromosome segregation in metazoans requires the alignment of sister-kinetochores onto the metaphase plate. During chromosome alignment, bioriented kinetochores move chromosomes by regulating the plus-end dynamics of the attached microtubules. The bundles of kinetochore-bound microtubules alternate between growth and shrinkage, leading to regular oscillations along the spindle axis. However, the molecular mechanisms that coordinate microtubule plus-end dynamics remain unknown. Here we show that CENP-H, a subunit of the CENP-A NAC/CAD kinetochore complex, is essential for this coordination, as kinetochores lacking CENP-H establish bioriented attachments, but fail to generate regular oscillations, due to an uncontrolled rate of microtubule plus-end turnover. These alterations lead to rapid erratic movements that disrupt metaphase plate organization. Moreover, we show that the abundance of the CENP-A NAC/CAD subunits CENP-H and CENP-I dynamically change on individual sister-kinetochores in vivo, as they preferentially bind the sister-kinetochore attached to growing microtubules, and that one other subunit, CENP-Q, binds microtubules in vitro. Thus, we propose that CENP-A NAC/CAD is a direct regulator of kinetochore-microtubule dynamics, which physically links centromeric DNA to microtubule plus-ends.
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影响因子:
21.3
作者:
Carroll, Christopher W.;Silva, Mariana C. C.;Godek, Kristina M.;Jansen, Lars E. T.;Straight, Aaron F.
通讯作者:
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