Spatiotemporal coordination of the RSF1-PLK1-Aurora B cascade establishes mitotic signaling platforms

Ho-Soo Lee (), Sunwoo Min, Ye-Eun Jung, Sunyoung Chae, June Heo, Jae-Ho Lee, TaeSoo Kim, Ho-Chul Kang, Makoto Nakanish, Sun-Shin Cha and Hyeseong Cho ()
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Ho-Soo Lee: Ajou University School of Medicine
Sunwoo Min: Ajou University School of Medicine
Ye-Eun Jung: Ewha Womans University
Sunyoung Chae: Ajou University School of Medicine
June Heo: Ajou University School of Medicine
Jae-Ho Lee: Ajou University School of Medicine
TaeSoo Kim: Ewha Womans University
Ho-Chul Kang: Ajou University School of Medicine
Makoto Nakanish: The University of Tokyo
Sun-Shin Cha: Ewha Womans University
Hyeseong Cho: Ajou University School of Medicine

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract The chromatin remodeler RSF1 enriched at mitotic centromeres is essential for proper chromosome alignment and segregation and underlying mechanisms remain to be disclosed. We here show that PLK1 recruitment by RSF1 at centromeres creates an activating phosphorylation on Thr236 in the activation loop of Aurora B and this is indispensable for the Aurora B activation. In structural modeling the phosphorylated Thr236 enhances the base catalysis by Asp200 nearby, facilitating the Thr232 autophosphorylation. Accordingly, RSF1-PLK1 is central for Aurora B-mediated microtubule destabilization in error correction. However, under full microtubule-kinetochore attachment RSF1-PLK1 positions at kinetochores, halts activating Aurora B and phosphorylates BubR1, regardless of tension. Spatial movement of RSF1-PLK1 to kinetochores is triggered by Aurora B-mediated phosphorylation of centromeric histone H3 on Ser28. We propose a regulatory RSF1-PLK1 axis that spatiotemporally controls on/off switch on Aurora B. This feedback circuit among RSF1-PLK1-Aurora B may coordinate dynamic microtubule-kinetochore attachment in early mitosis when full tension yet to be generated.

Date: 2021
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DOI: 10.1038/s41467-021-26220-z

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