机构地区: 深圳大学生命科学学院
出 处: 《深圳大学学报(理工版)》 2012年第1期80-84,共5页
摘 要: 指出处理小体(processing body,P-body)在真核细胞基因表达调节过程中,特别是在逆境条件下,能为mRNA在细胞质内转运提供储存和降解场所.研究通过农杆菌转化法成功将含有处理小体荧光标记物-脱帽酶1(decapping enzyme,DCP1)与青色荧光蛋白(cyan fluorescent protein,CFP)融合蛋白基因的植物表达载体转入烟草悬浮细胞.利用激光共聚焦显微镜观察到在高温和盐胁迫下,处理小体的数量和体积都有增加.通过蔗糖密度梯度离心分析逆境条件下多核糖体的变化,发现在高温和盐胁迫下,多核糖体解体,呈现翻译抑制特征. Processing bodies(P-body) serve as key functions in regulating gene expression in eukaryotic cells, and especially under stress conditions, serve as stress-induced mRNA relocalization sites for mRNA degradation or storage. We successfully transformed P-body fluorescent marker ( DCP1 and CFP fusion protein) containing plasmid into suspension BY-2 cells. Confocal observation found that P-body increased in abundance and size under heat and salt stress conditions. Sucrose gradient ultra-centrifugation analysis demonstrated that both heat and salt stress conditions induced polysome run-off. This is characteristic of inhibition of translation initiation.