Details

Autor(en) / Beteiligte

• Wei, Ronnie R.
• Schnell, Jason R.
• Larsen, Nicholas A.
• Sorger, Peter K.
• Chou, James J.
• Harrison, Stephen C.

Titel

Structure of a Central Component of the Yeast Kinetochore: The Spc24p/Spc25p Globular Domain

Ist Teil von

• Structure (London), 2006-06, Vol.14 (6), p.1003-1009

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2006

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Freely accessible e-journals

Beschreibungen/Notizen

• The Ndc80 complex, a kinetochore component conserved from yeast to humans, is essential for proper chromosome alignment and segregation during mitosis. It is an ∼570 Å long, rod-shaped assembly of four proteins—Ndc80p (Hec1), Nuf2p, Spc24p, and Spc25p—with globular regions at either end of a central shaft. The complex bridges from the centromere-proximal inner kinetochore layer at its Spc24/Spc25 globular end to the microtubule binding outer kinetochore layer at its Ndc80/Nuf2 globular end. We report the atomic structures of the Spc24/Spc25 globular domain, determined both by X-ray crystallography at 1.9 Å resolution and by NMR. Spc24 and Spc25 fold tightly together into a single globular entity with pseudo-2-fold symmetry. Conserved residues line a common hydrophobic core and the bottom of a cleft, indicating that the functional orthologs from other eukaryotes will have the same structure and suggesting a docking site for components of the inner kinetochore.