The C-terminus of Ubl4A is critical for pro-death activity and association with the Arp2/3 complex.

The C-terminus of Ubl4A is critical for pro-death activity and association with the Arp2/3 complex.
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DOI:
10.1016/j.bbrc.2018.08.123
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发表时间:
2018-09-18
影响因子:
3.1
通讯作者:
Xiang J
Xiang J
中科院分区:
生物学4区
文献类型:
--
作者:
Yao Q;Zhang H;Zhao Y;Ye Z;Lee YJ;Xiang J

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Ubl4A 是一种小型泛素样蛋白,参与多种细胞功能。我们已经证明,Ubl4A 对于体内饥饿介导的细胞死亡的存活至关重要。其根本机制是通过与肌动蛋白相关蛋白 Arp2/3 复合物相互作用并促进肌动蛋白分支。有趣的是,Ubl4A“放回”至 Ubl4A 缺陷细胞也会导致细胞死亡。去除Ubl4A N端显着增强其细胞毒性,表明Ubl4A的促死亡活性主要来自其C端区域。体外蛋白质下拉实验表明,Ubl4A 的 C 端区域可以直接与 Arp2/3 复合物相互作用。 Ubl4A C 末端天冬氨酸向丙氨酸 (D122A) 的单点突变消除了其结合 Arp2/3 复合物的能力。这种突变还会破坏容易被蛋白酶降解的 Ubl4A 蛋白的稳定性。重要的是,野生型 Ubl4A 的表达可以诱导结肠癌细胞死亡,但这种促死亡活性在 D122A 突变体中减弱。这些数据表明 Ubl4A C 末端,尤其是 D122,对于 Ubl4A-Arp2/3 相互作用及其促死亡功能至关重要。
Ubl4A is a small ubiquitin-like protein involved in diverse cellular functions. We have shown that Ubl4A is critical for survival of the starvation-mediated cell death in vivo. The underlying mechanism for this is through interaction with the actin-related protein Arp2/3 complex and promotion of actin branching. Interestingly, “put-back” of Ubl4A to Ubl4A-deficient cells also results in cell death. Removal of the Ubl4A N-terminus significantly enhances its cytotoxicity, indicating that the pro-death activity of Ubl4A is mainly from its C-terminal region. In vitro protein pull-down assays show that the C-terminal region of Ubl4A can directly interact with the Arp2/3 complex. The single point mutation of an aspartic acid to alanine (D122A) in the Ubl4A C-terminus abolishes its ability to bind the Arp2/3 complex. This mutation also destabilizes Ubl4A proteins susceptible to protease degradation. Importantly, expression of wild-type Ubl4A can induce cell death in colon cancer cells, but such pro-death activity is diminished in the D122A mutant. These data suggest that Ubl4A C-terminus, especially D122, is critical for Ubl4A-Arp2/3 interaction and its pro-death function.
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