Molecular organization of the Ndc80 complex, an essential kinetochore component

DOI Web Site 被引用文献6件
  • Ronnie R. Wei
    Department of Biological Chemistry and Molecular Pharmacology, and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115; and Department of Biology and Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, MA 02139
  • Peter K. Sorger
    Department of Biological Chemistry and Molecular Pharmacology, and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115; and Department of Biology and Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, MA 02139
  • Stephen C. Harrison
    Department of Biological Chemistry and Molecular Pharmacology, and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115; and Department of Biology and Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, MA 02139

書誌事項

公開日
2005-04-04
DOI
  • 10.1073/pnas.0501168102
公開者
Proceedings of the National Academy of Sciences

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<jats:p>The four-protein Ndc80 complex, an essential kinetochore component conserved from yeast to humans, plays an indispensable role in proper chromosome alignment and segregation during mitosis. In higher eukaryotes, the homologous complex probably resides in the middle domain of the trilaminar kinetochore, linking centromeric heterochromatin with microtubule-associated structures. We have prepared recombinant Ndc80 complex by pairwise coexpression of its components (Ndc80p and Nuf2p; Spc24p and Spc25p) and shown that they form independently stable subcomplexes. Rotary shadowing electron microscopy, combined with limited proteolysis and antibody labeling, demonstrates that the heterotetrameric Ndc80 complex is an ≈570-Å-long rod, with globular regions at either end. The shaft contains α-helical coiled-coil segments from each of the two subcomplexes, linked end-to-end. When integrated with published observations derived from inactivating the components of Ndc80, the molecular organization we deduce suggests that the Spc24p/Spc25p end of the rod faces the centromere and the Ndc80p/Nuf2p end faces a spindle microtubule.</jats:p>

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