Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain.
PLoS One. 2013 Sep 16;8(9):e73723. doi: 10.1371/journal.pone.0073723. eCollection 2013.
Poliovirus protease 2A (2A(pro)) obstructs host gene expression by reprogramming transcriptional and post-transcriptional regulatory events during infection. Here we demonstrate that expression of 2A(pro) induces a selective nucleo-cytoplasm translocation of several important RNA binding proteins and splicing factors. Subcellular fractionation studies, together with immunofluorescence microscopy revealed an asymmetric distribution of HuR and TIA1/TIAR in 2A(pro) expressing cells, which modulates splicing of the human Fas exon 6. Consistent with this result, knockdown of HuR or overexpression of TIA1/TIAR, leads to Fas exon 6 inclusion in 2A(pro)-expressing cells. Therefore, poliovirus 2A(pro) can target alternative pre-mRNA splicing by regulating protein shuttling between the nucleus and the cytoplasm.
脊髓灰质炎病毒蛋白酶 2A(2A(pro)) 通过在感染过程中重新编程转录和转录后调控事件来阻碍宿主基因表达。在这里,我们证明 2A(pro) 的表达诱导了几种重要的 RNA 结合蛋白和剪接因子的选择性核质易位。亚细胞分级分离研究以及免疫荧光显微镜观察显示,在表达 2A(pro) 的细胞中 HuR 和 TIA1/TIAR 呈不对称分布,这调节了人 Fas 外显子 6 的剪接。与这一结果一致的是,HuR 的敲低或 TIA1/TIAR 的过表达导致 Fas 外显子 6 在表达 2A(pro)的细胞中包含。因此,脊髓灰质炎病毒 2A(pro) 可以通过调节核质之间的蛋白质穿梭来靶向替代的前体 mRNA 剪接。