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Abstract:
For proper partitioning of chromosomes in mitosis, the chromosomalpassenger complex (CPC) including Aurora B and survivin mustbe localized at the center of paired kinetochores, at the sitecalled the inner centromere. It is largely unknown what definesthe inner centromere and how the CPC is targeted to this site.Here, we show that the phosphorylation of histone H3–threonine3 (H3-pT3) mediated by Haspin cooperates with Bub1-mediatedhistone 2A–serine 121 (H2A-S121) phosphorylation in targetingthe CPC to the inner centromere in fission yeast and human cells.H3-pT3 promotes nucleosome binding of survivin, whereas phosphorylatedH2A-S121 facilitates the binding of shugoshin, the centromericCPC adaptor. Haspin colocalizes with cohesin by associatingwith Pds5, whereas Bub1 localizes at kinetochores. Thus, theinner centromere is defined by intersection of two histone kinases.
1 Laboratory of Chromosome Dynamics, Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Tokyo 113-0032, Japan. 2 Graduate Program in Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan. 3 Graduate School of Agricultural and Life Science, University of Tokyo, Yayoi, Tokyo 113-0032, Japan.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: ywatanab{at}iam.u-tokyo.ac.jp
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