摘要：为了研究Stat3入核的分子机制,将SV40大T 抗原的经典核定位序列NLS(nuclear localization sequence)分别融合在Stat3-GFP分子和缺失突变体Dstat3-GFP的分子之间,构建Stat3-NLS-GFP和Dstat3-NLS-GFP融合分子.转染293T细胞,以NLS-GFP为阳性对照,通过激光共聚焦显微镜的观察融合分子的亚细胞位置,未经白介素-6刺激的Stat3-NLS-GFP和经白介素-6刺激的Stat3-GFP呈胞核分布,未经白介素-6刺激的Stat3-GFP和Dstat3-NLS-GFP呈胞浆分布. 初步证明Stat3入核是由于获得了核定位序列.
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