CENP-C Is a Structural Platform for Kinetochore Assembly
Centromeres provide a region of chromatin upon which kinetochores are assembled in mitosis [ 1, 2]. Centromeric protein C (CENP-C) is a core component of this centromeric chromatin [ 3, 4] that, when depleted, prevents the proper formation of both centromeres and kinetochores [ 5–10]. CENP-C localiz...
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Veröffentlicht in: | Current biology 2011-03, Vol.21 (5), p.399-405 |
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Zusammenfassung: | Centromeres provide a region of chromatin upon which kinetochores are assembled in mitosis [
1, 2]. Centromeric protein C (CENP-C) is a core component of this centromeric chromatin [
3, 4] that, when depleted, prevents the proper formation of both centromeres and kinetochores [
5–10]. CENP-C localizes to centromeres throughout the cell cycle via its C-terminal part [
6, 8], whereas its N-terminal part appears necessary for recruitment of some but not all components of the Mis12 complex of the kinetochore [
8]. We now find that all kinetochore proteins belonging to the KMN (
KNL1/Spc105, the
Mis12 complex, and the
Ndc80 complex) network [
1] bind to the N-terminal part of
Drosophila CENP-C. Moreover, we show that the Mis12 complex component Nnf1 interacts directly with CENP-C in vitro. To test whether CENP-C's N-terminal part was sufficient to recruit KMN proteins, we targeted it to the centrosome by fusing it to a domain of Plk4 kinase [
11]. The Mis12 and Ndc80 complexes and Spc105 protein were then all recruited to centrosomes at the expense of centromeres, leading to mitotic abnormalities typical of cells with defective kinetochores. Thus, the N-terminal part of
Drosophila CENP-C is sufficient to recruit core kinetochore components and acts as the principal linkage between centromere and kinetochore during mitosis.
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► The amino-terminal part of the centromeric protein CENP-C binds kinetochore proteins ► The CENP-C's N-terminus is sufficient to recruit KMN proteins even to ectopic sites ► The expression of this fragment of CENP-C in culture cells leads to mitotic defects ► In mitosis, CENP-C functions as a linker between centromeres and kinetochores |
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ISSN: | 0960-9822 1879-0445 |
DOI: | 10.1016/j.cub.2011.02.005 |