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Published on: July 30, 2020
Aurora Kinase B Phosphorylates Histone H3.3 at Serine 31 during Mitosis in Mammalian Cells
Miao Li1, Qiang Dong2, Bing Zhu3
1Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program, School of Life Sciences, Peking University, Beijing, 100081, China; National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; National Institute of Biological Sciences, Beijing 102206, China.
Abstract:
Serine 31 of histone H3.3 is phosphorylated during mitosis in mammalian cells and has been shown to influence chromosome segregation. We established a screening system to identify candidate kinase(s) phosphorylating H3.3S31 by using siRNA library targeting 720 human kinases, and we confirmed the results with an independent kinase inhibitor screen. Aurora kinase B was the best candidate hit in both screens. Moreover, the kinase activity of Aurora B on H3.3S31 was biochemically confirmed with nucleosomal substrates in vitro.
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