The internal loop of fission yeast Ndc80 binds Alp7/TACC-Alp14/TOG and ensures proper chromosome attachment.

The Ndc80 outer kinetochore complex plays a critical role in kinetochore-microtubule attachment, yet our understanding of the mechanism by which this complex interacts with spindle microtubules for timely and accurate chromosome segregation remains limited. Here we address this issue using an ndc80 mutant (ndc80-NH12) from fission yeast that contains a ...
point mutation within a ubiquitous internal loop. This mutant is normal for assembly of the Ndc80 complex and bipolar spindle formation, yet defective in proper end-on attachment to the spindle microtubule, with chromosome alignment defects and mis-segregation happening later during mitosis. We have found that ndc80-NH12 exhibits impaired localization of the microtubule-associated protein complex Alp7/TACC-Alp14/TOG to the mitotic kinetochore. Consistently, wild type Ndc80 binds these two proteins, while the Ndc80-NH12 mutant protein displays a substantial reduction of interaction. Crucially, forced targeting of Alp7-Alp14 to the outer kinetochore rescues ndc80-NH12 mutant phenotypes. The loop is previously shown to bind Dis1/TOG, by which it ensures initial chromosome capture during early mitosis. Strikingly, ndc80-NH12 is normal in Dis1 localization. Genetic results indicate that the loop recruits Dis1/TOG and Alp7/TACC-Alp14/TOG independently. Our work, therefore, establishes that the Ndc80 loop plays sequential roles in spindle-kinetochore attachment by connecting the Ndc80 complex to Dis1/TOG and Alp7/TACC-Alp14/TOG.
Mol. Biol. Cell
Date: Feb. 20, 2013
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