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Abstract
Strong kinetochore-microtubule attachments are essential for faithful segregation of sister chromatids during mitosis. The Dam1 and Ndc80 complexes are the main microtubule binding components of the Saccharomyces cerevisiae kinetochore. Cooperation between these two complexes enhances kinetochore-microtubule coupling and is regulated by Aurora B kinase. We show that the Ndc80 complex can simultaneously bind and bridge across two Dam1 complex rings through a tripartite interaction, each component of which is regulated by Aurora B kinase. Mutations in any one of the Ndc80p interaction regions abrogates the Ndc80 complex's ability to bind two Dam1 rings in vitro, and results in kinetochore biorientation and microtubule attachment defects in vivo. We also show that an extra-long Ndc80 complex, engineered to space the two Dam1 rings further apart, does not support growth. Taken together, our work suggests that each kinetochore in vivo contains two Dam1 rings and that proper spacing between the rings is vital.
Highlights
Kinetochores link replicated chromosomes to spindle microtubules
We provide evidence that the kinetochore requires the Ndc80 complex to bind and bridge two Dam1 complex rings in vivo and that Aurora B kinase regulates the interactions at both rings
Phosphorylation of all five sites fully disrupts the interaction between the Dam1 and Ndc80 complexes (Lampert et al, 2010; Tien et al, 2010)
Summary
Kinetochores link replicated chromosomes to spindle microtubules. They form attachments flexible and strong enough to stay attached to microtubules during assembly and disassembly. The two complexes interact on microtubules, significantly increasing the strength of Ndc complex attachment to microtubules (Lampert et al, 2010, 2013; Tien et al, 2010). How these two complexes interact on microtubules remains uncertain with conflicting results reported in the literature (Lampert et al, 2013; Maure et al, 2011)
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