CRM1-IN-1

一种新的蛋白核转运研究工具：Leptomycin B

  蛋白和mRNA在细胞核和细胞质之间的运输称为入核和出核，它是维持细胞动态稳定的重要因素。这些细胞成分的进核、出核是蛋白合成、细胞增殖和细胞凋亡的关键步骤。这种运输需要一些其它蛋白因子的辅助并要求这些被运输物质上有一特定的可识别定位序列。入核信号称为核定位信号(NLS)，出核信号称为核输出信号(NES)。  入核和出核在核孔复合物上发生，它是嵌在核膜上的超分子多肽复合物。小分子和离子是被动扩散的，而蛋白和RNA的运输则需要信号介导并消耗能量。CRM1，即exportin

Analysis of Nuclear and Cytoplasmic Degradation of p53 in Cells after Stress

Until recently, the accepted model held that p53 degradation occurs exclusively on cytoplasmic proteasomes and, hence, has an absolute requirement for nuclear export of p53 via the CRM1 pathway. However, proteasomes are abundant

Using the cre-lox recombination system to assess functional impairment caused by amino acid substitutions in yeast proteins

resembles the canonical leucine-rich nuclear export sequence (NES) found in proteins that bind Crm1p exportin. To test the function of the putative NES, site-directed mutations that cause substitutions of conserved NES-A residues were first selected