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-Structure paper
| タイトル | Microtubule end stabilisation by cooperative oligomers of Ska and Ndc80 complexes. |
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| ジャーナル・号・ページ | EMBO J, Year 2026 |
| 掲載日 | 2026年3月20日 |
著者 | Renjith M Radhakrishnan / Lauren Stokes / Matthew Day / Pim J Huis In 't Veld / Vladimir A Volkov / ![]() |
| PubMed 要旨 | During mitosis, properly aligned chromosomes stabilise microtubule ends with the help of kinetochores to ensure timely segregation of chromosomes. Microtubule-binding components of the human outer ...During mitosis, properly aligned chromosomes stabilise microtubule ends with the help of kinetochores to ensure timely segregation of chromosomes. Microtubule-binding components of the human outer kinetochore, such as Ndc80 and Ska complexes, are present in multiple copies and together bind several microtubule ends, creating a highly multivalent binding interface. Whereas Ndc80:Ndc80 and Ndc80:microtubule binding is crucial for interface stability, Ndc80 alone in absence of Ska is unable to support stable kinetochore-attachments. Using cryo-electron tomography, we demonstrate that oligomeric Ndc80:Ska assemblies stabilise microtubule ends against shortening by strengthening lateral contacts between tubulin protofilaments at microtubule plus-ends. We further identify a point mutation within the SKA1 microtubule-binding domain that does not affect microtubule-binding of individual Ska molecules, but does abolish Ska:Ska interactions. Finally, we report that oligomerisation of Ska, in a cooperative fashion together with the Ndc80, is necessary to maintain stable microtubule attachments both in vivo and in vitro. |
リンク | EMBO J / PubMed:41862644 |
| 手法 | EM (サブトモグラム平均) |
| 解像度 | 22.0 - 30.0 Å |
| 構造データ | ![]() EMDB-56085: Oligomer of the human Ndc80 complex decorating a microtubule ![]() EMDB-56086: Ndc80-decorated microtubule ![]() EMDB-56087: Microtubules in presence of Ndc80 and Ska, non-Ndc80 microtubule-bound molecules ![]() EMDB-56088: Ndc80-decorated microtubule |
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Homo sapiens (ヒト)