...
首页> 外文期刊>Molecular and Cellular Biology >In Vivo Analysis of Importin α Proteins Reveals Cellular Proliferation Inhibition and Substrate Specificity
【24h】

In Vivo Analysis of Importin α Proteins Reveals Cellular Proliferation Inhibition and Substrate Specificity

机译:Importinα蛋白的体内分析显示细胞增殖抑制和底物特异性。

获取原文
           

摘要

The “classical” nuclear import pathway depends on importins α and β. Humans have only one importin β, while six α importins have been described. Whether or not distinct α importins are essential for specific import pathways in living human cells is unclear. We used RNA interference technology to specifically down-regulate the expression of ubiquitously expressed human α importins in HeLa cells. Down-regulation of importins α3, α5, α7, and β strongly inhibited HeLa cell proliferation, while down-regulation of importins α1 and α4 had only a minor effect or no effect. Nucleoplasmin import was not prevented by down-regulation of any α importin, indicating that the importin α/β pathway was generally not affected. In contrast, importin α3 or α5 down-regulation specifically inhibited the nuclear import of the Ran guanine nucleotide exchange factor, RCC1. Coinjection of recombinant α importins and RCC1 into down-regulated cells demonstrated that these transport defects were specifically caused by the limited availability of importin α3 in both cases. Thus, importin α3 is the only α importin responsible for the classical nuclear import of RCC1 in living cells.
机译:“经典的”核输入途径取决于输入蛋白α和β。人类只有一个重要的输入素β,而已经描述了六个重要的输入素。目前尚不清楚不同的αimportin是否对于活人细胞中的特定输入途径必不可少。我们使用RNA干扰技术专门下调HeLa细胞中普遍表达的人α导入素的表达。 Importinsα3,α5,α7和β的下调强烈抑制HeLa细胞的增殖,而Importinsα1和α4的下调仅产生很小的作用或没有作用。不能通过下调任何αimportin来阻止核质素的输入,这表明importinα/β途径通常不受影响。相反,importinα3或α5下调会特异性抑制Ran鸟嘌呤核苷酸交换因子RCC1的核输入。将重组αimportin和RCC1共注入到下调的细胞中表明,这两种转运缺陷是由于在两种情况下importinα3的有限可用性所引起的。因此,importinα3是负责活细胞中RCC1的经典核输入的唯一αimportin。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号