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2 Janelia Publications

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    Gonen Lab
    08/12/12 | The structure of purified kinetochores reveals multiple microtubule-attachment sites.
    Gonen S, Akiyoshi B, Iadanza MG, Shi D, Duggan N, Biggins S, Gonen T
    Nature Structural & Molecular Biology. 2012 Aug 12;19(9):925-9. doi: 10.1038/nsmb.2358

    Chromosomes must be accurately partitioned to daughter cells to prevent aneuploidy, a hallmark of many tumors and birth defects. Kinetochores are the macromolecular machines that segregate chromosomes by maintaining load-bearing attachments to the dynamic tips of microtubules. Here, we present the structure of isolated budding-yeast kinetochore particles, as visualized by EM and electron tomography of negatively stained preparations. The kinetochore appears as an  126-nm particle containing a large central hub surrounded by multiple outer globular domains. In the presence of microtubules, some particles also have a ring that encircles the microtubule. Our data, showing that kinetochores bind to microtubules via multivalent attachments, lay the foundation to uncover the key mechanical and regulatory mechanisms by which kinetochores control chromosome segregation and cell division.

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    Gonen Lab
    08/01/12 | Recent progress in membrane protein structures and investigation methods.
    Gonen T, Waksman G
    Current Opinion in Structural Biology. 2012 Aug;22(4):467-8. doi: 10.1016/j.sbi.2012.07.002