A noncatalytic function of the topoisomerase II CTD in Aurora B recruitment to inner centromeres during mitosis.

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The Journal of cell biology, ISSN: 1540-8140, Vol: 213, Issue: 6, Page: 651-64

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Edgerton, Heather, Johansson, Marnie, Keifenheim, Daniel, Mukherjee, Soumya, Chacón, Jeremy M, Bachant, Jeff, Gardner, Melissa K, Clarke, Duncan J
Rockefeller University Press
Biochemistry, Genetics and Molecular Biology
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Faithful chromosome segregation depends on the precise timing of chromatid separation, which is enforced by checkpoint signals generated at kinetochores. Here, we provide evidence that the C-terminal domain (CTD) of DNA topoisomerase IIα (Topo II) provides a novel function at inner centromeres of kinetochores in mitosis. We find that the yeast CTD is required for recruitment of the tension checkpoint kinase Ipl1/Aurora B to inner centromeres in metaphase but is not required in interphase. Conserved CTD SUMOylation sites are required for Ipl1 recruitment. This inner-centromere CTD function is distinct from the catalytic activity of Topo II. Genetic and biochemical evidence suggests that Topo II recruits Ipl1 via the Haspin-histone H3 threonine 3 phosphorylation pathway. Finally, Topo II and Sgo1 are equally important for Ipl1 recruitment to inner centromeres. This indicates H3 T3-Phos/H2A T120-Phos is a universal epigenetic signature that defines the eukaryotic inner centromere and provides the binding site for Ipl1/Aurora B.

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