ASB7 regulates spindle dynamics and genome integrity by targeting DDA3 for proteasomal degradation.

ASB7 regulates spindle dynamics and genome integrity by targeting DDA3 for proteasomal degradation.
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DOI:
10.1083/jcb.201603062
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发表时间:
2016-10-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kamura T
Kamura T
中科院分区:
其他
文献类型:
--
作者:
Uematsu K;Okumura F;Tonogai S;Joo-Okumura A;Alemayehu DH;Nishikimi A;Fukui Y;Nakatsukasa K;Kamura T

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Uematsu等人表明,ASB 7泛素化DDA 3,其促进Kif 2a介导的微管(MT)解聚以进行蛋白酶体降解。MT的存在阻止了ASB 7-DDA 3的相互作用,这表明了一个反馈回路来适当地调节MT聚合和纺锤体动力学。纺锤体的适当动态调节对于成功的细胞分裂是必不可少的。然而,在有丝分裂中调节纺锤体动力学的分子机制还没有完全理解。在这项研究中,我们表明,Cullin 5相互作用的细胞因子信号传导盒蛋白ASB 7的抑制泛素化DDA 3,纺锤体动力学的调节器,从而针对它的蛋白酶体降解。微管(MT)的存在阻止了ASB 7-DDA 3的相互作用,从而稳定了DDA 3。ASB 7的敲除降低了MT聚合,增加了染色体不对齐的细胞比例,而这种表型通过缺失DDA 3而得以挽救。总的来说,这些数据表明,ASB 7通过控制DDA 3的表达在调节纺锤体动力学和基因组完整性方面起着至关重要的作用。
Uematsu et al. show that ASB7 ubiquitinates DDA3, which facilitates Kif2a-mediated depolymerization of microtubules (MTs) for proteasomal degradation. The presence of MTs prevents the ASB7–DDA3 interaction, suggesting a feedback loop to appropriately regulate MT polymerization and spindle dynamics. Proper dynamic regulation of the spindle is essential for successful cell division. However, the molecular mechanisms that regulate spindle dynamics in mitosis are not fully understood. In this study, we show that Cullin 5–interacting suppressor of cytokine signaling box protein ASB7 ubiquitinates DDA3, a regulator of spindle dynamics, thereby targeting it for proteasomal degradation. The presence of microtubules (MTs) prevented the ASB7–DDA3 interaction, thus stabilizing DDA3. Knockdown of ASB7 decreased MT polymerization and increased the proportion of cells with unaligned chromosomes, and this phenotype was rescued by deletion of DDA3. Collectively, these data indicate that ASB7 plays a crucial role in regulating spindle dynamics and genome integrity by controlling the expression of DDA3.
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