Architecture of the human Ndc80-Hec1 complex, a critical constituent of the outer kinetochore

Claudio Ciferri, Jennifer De Lucall, Silvia Monzani, Karin J. Ferrari, Dejan Ristic, Claire Wyman, Holger Stark, John Kilmartin, Edward D. Salmon, Andrea Musacchio

Research output: Contribution to journalArticlepeer-review


The Ndc80 complex is a constituent of the outer plate of the kinetochore and plays a critical role in establishing the stable kinetochore-microtubule interactions required for chromosome segregation in mitosis. The Ndc80 complex is evolutionarily conserved and contains the four subunits Spc24, Spc25, Nuf2, and Ndc80 (whose human homologue is called Heel). All four subunits are predicted to contain globular domains and extensive coiled coil regions. To gain an insight into the organization of the human Ndc80 complex, we reconstituted it using recombinant methods. The hydrodynamic properties of the recombinant Ndc80 complex are identical to those of the endogenous HeLa cell complex and are consistent with a 1:1:1:1 stoichiometry of the four subunits and a very elongated shape. Two tight Hec1-Nuf2 and Spc24-Spc25 subcomplexes, each stabilized by a parallel heterodimeric coiled coil, maintain this organization. These subcomplexes tetramerize via an interaction of the C- and N-terminal portions of the Hec1-Nuf2 and Spc24-Spc25 coiled coils, respectively. The recombinant complex displays normal kinetochore localization upon injection in HeLa cells and is therefore a faithful copy of the endogenous Ndc80 complex.

Original languageEnglish
Pages (from-to)29088-29095
Number of pages8
JournalJournal of Biological Chemistry
Issue number32
Publication statusPublished - Aug 12 2005

ASJC Scopus subject areas

  • Biochemistry

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