The Dam1 complex confers microtubule plus end-tracking activity to the Ndc80 kinetochore complex.

The Dam1 complex confers microtubule plus end-tracking activity to the Ndc80 kinetochore complex.
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DOI:
10.1083/jcb.200912021
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发表时间:
2010-05-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Westermann S
Westermann S
中科院分区:
其他
文献类型:
--
作者:
Lampert F;Hornung P;Westermann S

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The Ndc80 complex of kinetochores doesn't recognize microtubule tips by itself but relies on the Dam1 complex to track microtubule plus ends (see also related paper by Tien et al. in this issue). Kinetochores must remain associated with microtubule ends, as they undergo rapid transitions between growth and shrinkage. The molecular basis for this essential activity that ensures correct chromosome segregation is unclear. In this study, we have used reconstitution of dynamic microtubules and total internal reflection fluorescence microscopy to define the functional relationship between two important budding yeast kinetochore complexes. We find that the Dam1 complex is an autonomous plus end–tracking complex. The Ndc80 complex, despite being structurally related to the general tip tracker EB1, fails to recognize growing ends efficiently. Dam1 oligomers are necessary and sufficient to recruit Ndc80 to dynamic microtubule ends, where both complexes remain continuously associated. The interaction occurs specifically in the presence of microtubules and is subject to regulation by Ipl1 phosphorylation. These findings can explain how the force harvested by Dam1 is transmitted to the rest of the kinetochore via the Ndc80 complex.
动力学 - 微管附着依赖于Hec1的无序N末端尾部结构域。
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