Reference: Anderson M, et al. (2009) Function and assembly of DNA looping, clustering, and microtubule attachment complexes within a eukaryotic kinetochore. Mol Biol Cell 20(19):4131-9

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Abstract


Monitoring Editor: David G. Drubin The kinetochore is a complex protein-DNA assembly that provides the mechanical linkage between microtubules and the centromere DNA of each chromosome. Centromere DNA in all eukaryotes is wrapped around a unique nucleosome that contains the histone H3 variant, CENP-A (Cse4p in S. cerevisiae). Here we report that the inner kinetochore complex (CBF3) is required for pericentric DNA looping at the Cse4p-containing nucleosome. DNA within the pericentric loop occupies a spatially confined area that is radially displaced from the interpolar central spindle. Microtubule-binding kinetochore complexes are not involved in pericentric DNA looping but are required for the geometric organization of DNA loops around the spindle microtubules in metaphase. Thus the mitotic segregation apparatus is a composite structure comprised of kinetochore and interpolar microtubules, the kinetochore, and organized pericentric DNA loops. The linkage of microtubule-binding to centromere DNA-looping complexes positions the pericentric chromatin loops and stabilizes the dynamic properties of individual kinetochore complexes in mitosis.

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Journal Article
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Anderson M, Haase J, Yeh E, Bloom K
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