Spatiotemporal dynamics of Spc105 regulates the assembly of the Drosophila kinetochore.
Spatiotemporal dynamics of Spc105 regulates the assembly of the Drosophila kinetochore.
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DOI:
10.1098/rsob.110032
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发表时间:
2012-02
期刊:
影响因子:
5.8
通讯作者:
Glover DM
中科院分区:
文献类型:
--
作者:
Venkei Z;Przewloka MR;Ladak Y;Albadri S;Sossick A;Juhasz G;Novák B;Glover DM
The formation of kinetochores shortly before each cell division is a prerequisite for proper chromosome segregation. The synchronous mitoses of Drosophila syncytial embryos have provided an ideal in vivo system to follow kinetochore assembly kinetics and so address the question of how kinetochore formation is regulated. We found that the nuclear exclusion of the Spc105/KNL1 protein during interphase prevents precocious assembly of the Mis12 complex. The nuclear import of Spc105 in early prophase and its immediate association with the Mis12 complex on centromeres are thus the first steps in kinetochore assembly. The cumulative kinetochore levels of Spc105 and Mis12 complex then determine the rate of Ndc80 complex recruitment commencing only after nuclear envelope breakdown. The carboxy-terminal part of Spc105 directs its nuclear import and is sufficient for the assembly of all core kinetochore components and CENP-C, when localized ectopically to centrosomes. Super-resolution microscopy shows that carboxy-terminus of Spc105 lies at the junction of the Mis12 and Ndc80 complexes on stretched kinetochores. Our study thus indicates that physical accessibility of kinetochore components plays a crucial role in the regulation of Drosophila kinetochore assembly and leads us to a model in which Spc105 is a licensing factor for its onset.
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DOI:
10.1007/978-1-60327-993-2_6
发表时间:
2009-01-01
期刊:
MITOSIS: METHODS AND PROTOCOLS
影响因子:
--
作者:
D'Avino, Pier Paolo;Archambault, Vincent;Glover, David M.
通讯作者:
Glover, David M.
影响因子:
64.5
作者:
Ciferri, Claudio;Pasqualato, Sebastiano;Musacchio, Andrea
通讯作者:
Musacchio, Andrea
DOI:
10.1016/j.cub.2009.02.056
发表时间:
2009-04-28
期刊:
Current biology : CB
影响因子:
--
作者:
Joglekar AP;Bloom K;Salmon ED
通讯作者:
Salmon ED
影响因子:
12.3
作者:
Meraldi P;McAinsh AD;Rheinbay E;Sorger PK
通讯作者:
Sorger PK
影响因子:
10.5
作者:
Häcker, U;Perrimon, N
通讯作者:
Perrimon, N