期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 297, 期 3, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jbc.2021.101024
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Aurora-B forms a complex with myosin-IIB during late mitosis, phosphorylating myosin-IIB and inhibiting its ability to form filaments, leading to filament disassembly. This process is important for cytokinesis, as demonstrated by the failure to rescue cytokinesis defects with a phosphomimetic mutation at threonine 1847 in myosin-IIB.
Cytokinesis, the final step of mitosis, is mediated by an actomyosin contractile ring, the formation of which is temporally and spatially regulated following anaphase onset. AuroraB is a member of the chromosomal passenger complex, which regulates various processes during mitosis; it is not understood, however, how Aurora-B is involved in cytokinesis. Here, we show that Aurora-B and myosin-IIB form a complex in vivo during telophase. Aurora-B phosphorylates the myosin-IIB rod domain at threonine 1847 (T1847), abrogating the ability of myosin-IIB monomers to form filaments. Furthermore, phosphorylation of myosin-IIB filaments by Aurora-B also promotes filament disassembly. We show that myosin-IIB possessing a phosphomimetic mutation at T1847 was unable to rescue cytokinesis failure caused by myosin-IIB depletion. Cells expressing a phosphoresistant mutation at T1847 had significantly longer intercellular bridges, implying that Aurora-Bmediated phosphorylation of myosin-IIB is important for abscission. We propose that myosin-IIB is a substrate of Aurora-B and reveal a new mechanism of myosin-IIB regulation by Aurora-B in the late stages of mitosis.
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