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The kinetochore-bound Ska1 complex tracks depolymerizing microtubules and binds to curved protofilaments.

Developmental cell | 2012

To ensure equal chromosome segregation during mitosis, the macromolecular kinetochore must remain attached to depolymerizing microtubules, which drive chromosome movements. How kinetochores associate with depolymerizing microtubules, which undergo dramatic structural changes forming curved protofilaments, has yet to be defined in vertebrates. Here, we demonstrate that the conserved kinetochore-localized Ska1 complex tracks with depolymerizing microtubule ends and associates with both the microtubule lattice and curved protofilaments. In contrast, the Ndc80 complex, a central player in the kinetochore-microtubule interface, binds only to the straight microtubule lattice and lacks tracking activity. We demonstrate that the Ska1 complex imparts its tracking capability to the Ndc80 complex. Finally, we present a structure of the Ska1 microtubule-binding domain that reveals its interaction with microtubules and its regulation by Aurora B. This work defines an integrated kinetochore-microtubule interface formed by the Ska1 and Ndc80 complexes that associates with depolymerizing microtubules, potentially by interacting with curved microtubule protofilaments.

Pubmed ID: 23085020 RIS Download

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Associated grants

  • Agency: PHS HHS, United States
    Id: NIDDK-K01-DK085198
  • Agency: NIGMS NIH HHS, United States
    Id: P01-GM-047467
  • Agency: NIGMS NIH HHS, United States
    Id: GM052468-17
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM088313
  • Agency: NIDDK NIH HHS, United States
    Id: K01 DK085198
  • Agency: NIGMS NIH HHS, United States
    Id: P01 GM047467
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM052468
  • Agency: NIGMS NIH HHS, United States
    Id: GM088313
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM098389
  • Agency: NIGMS NIH HHS, United States
    Id: R37 GM052468
  • Agency: NIGMS NIH HHS, United States
    Id: GM098389

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