Site-specific phosphorylation of ZYG-1 regulates ZYG-1 stability and centrosome number.

Site-specific phosphorylation of ZYG-1 regulates ZYG-1 stability and centrosome number.
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DOI:
10.1016/j.isci.2023.108410
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发表时间:
2023-12-15
期刊:
影响因子:
5.8
通讯作者:
Song, Mi Hye
Song, Mi Hye
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Medley, Jeffrey C.;Yim, Rachel N.;DiPanni, Joseph;Sebou, Brandon;Shaffou, Blake;Cramer, Evan;Wu, Colin;Kabara, Megan;Song, Mi Hye

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纺锤体双极性对基因组完整性至关重要。中心体的数量通常决定着双极性,因此中心体组装的严格控制对细胞的忠实分裂至关重要。主中心体调节因子ZYG-1/Plk4在这一过程中起关键作用。在秀丽隐杆线虫中,酪蛋白激酶II (CK2)通过控制中心体相关的ZYG-1水平负向调节中心体复制。在这里,我们研究了CK2作为ZYG-1的调节因子及其对中心体组装的影响。我们发现CK2在体外磷酸化ZYG-1,并在体内与ZYG-1发生物理相互作用。耗尽CK2或阻断CK2靶位点的ZYG-1磷酸化可导致中心体扩增。不可磷酸化的ZYG-1突变体表现出ZYG-1水平升高,导致中心体上ZYG-1和下游因子增加,从而驱动中心体扩增。此外,抑制26S蛋白酶体可以防止模拟磷酸化的ZYG-1的降解。我们的研究结果表明,ck2依赖性的ZYG-1磷酸化通过蛋白酶体降解来控制ZYG-1水平,从而限制中心体数量。耗尽酪蛋白激酶II (CK2)导致额外的中心体CK2直接磷酸化ZYG-1, ZYG-1被CK2磷酸化触发蛋白酶体降解ZYG-1, CK2依赖性磷酸化ZYG-1调节中心体数量;细胞;细胞生物学;分子生物学;遗传学
Spindle bipolarity is critical for genomic integrity. As centrosome number often dictates bipolarity, tight control of centrosome assembly is vital for faithful cell division. The master centrosome regulator ZYG-1/Plk4 plays a pivotal role in this process. In C. elegans, casein kinase II (CK2) negatively regulates centrosome duplication by controlling centrosome-associated ZYG-1 levels. Here, we investigated CK2 as a regulator of ZYG-1 and its impact on centrosome assembly. We show that CK2 phosphorylates ZYG-1 in vitro and physically interacts with ZYG-1 in vivo. Depleting CK2 or blocking ZYG-1 phosphorylation at CK2 target sites leads to centrosome amplification. Non-phosphorylatable ZYG-1 mutants exhibit elevated ZYG-1 levels, leading to increased ZYG-1 and downstream factors at centrosomes, thus driving centrosome amplification. Moreover, inhibiting the 26S proteasome prevents degradation of the phospho-mimetic ZYG-1. Our findings suggest that CK2-dependent phosphorylation of ZYG-1 controls ZYG-1 levels via proteasomal degradation to limit centrosome number. Depleting casein kinase II (CK2) leads to extra centrosomes CK2 directly phosphorylates ZYG-1 ZYG-1 phosphorylation by CK2 triggers proteasomal degradation of ZYG-1 CK2-dependent phosphorylation of ZYG-1 regulates centrosome number Biological sciences; Cell; Cell biology; Molecular biology; Genetics
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