Structure of the Ndc80 complex and its interactions at the yeast kinetochore–microtubule interface
- Harvard University, Boston, MA (United States)
- Harvard University, Boston, MA (United States); Harvard Medical School, Boston, MA (United States)
The conserved Ndc80 kinetochore complex, Ndc80c, is the principal link between mitotic spindle microtubules and centromere-associated proteins. We used AlphaFold 2 (AF2) to obtain predictions of the Ndc80 ‘loop’ structure and of the Ndc80 : Nuf2 globular head domains that interact with the Dam1 subunit of the heterodecameric DASH/Dam1 complex (Dam1c). The predictions guided design of crystallizable constructs, with structures close to the predicted ones. The Ndc80 ‘loop’ is a stiff, α-helical ‘switchback’ structure; AF2 predictions and positions of preferential cleavage sites indicate that flexibility within the long Ndc80c rod occurs instead at a hinge closer to the globular head. Conserved stretches of the Dam1 C terminus bind Ndc80c such that phosphorylation of Dam1 serine residues 257, 265 and 292 by the mitotic kinase Ipl1/Aurora B can release this contact during error correction of mis-attached kinetochores. We integrate the structural results presented here into our current molecular model of the kinetochore–microtubule interface. The model illustrates how multiple interactions between Ndc80c, DASH/Dam1c and the microtubule lattice stabilize kinetochore attachments.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- American Cancer Society; National Institutes of Health (NIH); USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2469543
- Journal Information:
- Open Biology, Journal Name: Open Biology Journal Issue: 3 Vol. 13; ISSN 2046-2441
- Publisher:
- The Royal SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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