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:
影响因子:
--
通讯作者:
Kamura T
中科院分区:
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
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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