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Poly(dI.dC)

LightShiftTM 聚(dI-dC)

Company: Thermo Fisher Scientific
Catalog#: 20148E
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A Detailed and Radioisotope-free Protocol for Electrophoretic Mobility Shift Assay (EMSA)
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2020-08-20
[Abstract]  To comprehensively characterize the functions of a transcription factor (TF), it is required to analyze the interaction of this TF with its targeted loci. Several methods such as β-glucuronidase (GUS) or luciferase reporter, yeast one-hybrid (Y1H), chromatin-immunoprecipitation (ChIP), and electrophoretic mobility shift assay (EMSA) assays have been developed. Of these, EMSA is an in vitro method which can prove the direct interaction between TF and targeted DNA fragment. In the present protocol, DNA probes are labeled with Biotin. Therefore, it is safer for researchers when they do not need to use radioisotope-labeled probes. In addition, this protocol is to provide a detailed procedure for a successful EMSA assay. The interested recombinant protein can be mixed with ... [摘要]  [摘要] 为了全面表征转录因子(TF)的功能,需要分析该TF与目标基因座的相互作用。已经开发了几种方法,例如β-葡萄糖醛酸苷酶(GUS)或荧光素酶报道基因,酵母单杂交(Y1H),染色质免疫沉淀(ChIP )和电泳迁移率变动分析(EMSA)分析。其中,EMSA是体外的 可以证明TF与目标DNA片段之间直接相互作用的方法。在本协议中,DNA探针用生物素标记。因此,当研究人员不需要使用放射性同位素标记的探针时,它更安全。此外,该协议还将为成功的EMSA分析提供详细的程序。可以将感兴趣的重组蛋白与靶向DNA探针混合,以在室温(25°C)下进行结合反应。之后,反应混合物可以在天然聚丙烯酰胺凝胶中运行,并转移到带正电的尼龙膜上。最后,可以通过生物素-链霉亲和素化学发光检测结果并可视化。

[背景 ] EMSA是检测蛋白(之间的直接相互作用的有效方法例如,转录因子)和DNA片段(陈,2011)。通常,与蛋白质结合的DNA探针的移动速度比凝胶中的游离DNA探针的移动速度慢。可以观察到这种蛋白质-DNA复合物的移动带移位,而游离DNA探针向凝胶底部的移动速度更快。基于此特征,可以用放射性同位素[ 例如Phosphorus-32(32 ...

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