FLAG标记的Kir2.3通道的构建、表达及其对Kir2.3通道功能的影响
首发时间:2012-11-13
摘要:目的:构建FLAG标记的Kir2.3通道蛋白,为进一步研究通道的生理功能和调节机制奠定基础。方法:运用聚合酶链式反应(PCR)技术,将FLAG标记短肽DNA碱基序列插入到Kir2.3通道氨基末端,构建重组质粒DNA:FLAG-Kir2.3-pGEMHE,采用菌落PCR方法挑取阳性克隆;表达于非洲爪蟾卵母细胞,验证加入标记后,是否影响Kir2.3通道蛋白的功能;进行免疫细胞化学实验,检测FLAG标记短肽表达情况。结果:经测序验证,FLAG-Kir2.3-pGEMHE重组质粒DNA构建成功,没有碱基突变。FLAG标记短肽没有影响Kir2.3通道功能, FLAG-Kir2.3-pGEMHE成功表达于非洲爪蟾卵母细胞,双电极电压钳可以记录到电流。免疫细胞化学实验证实FLAG标记短肽表达。结论:成功构建重组质粒DNA,FLAG标记短肽已与Kir2.3通道蛋白成功融合并有效表达。
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Construction of FLAG tagged Kir2.3 channel, its expression and functional study
Abstract:Objective: Flag tag will be inserted into the upstream of Kir2.3-pGEMHE DNA sequence, which will laid a basis for future research. Methods: The DNA base sequence corresponding to the amino acid sequence of Flag peptide was inserted into the N-terminal of Kir2.3 by PCR. The recombinant plasmid DNA FLAG-Kir2.3-pGEMHE would be constructed. The correct clones were chosen by the method of colony PCR and sent for sequencing. Flag-Kir2.3 will be expressed in the Xenopus oocytes. Consequence of Flag tagging on the Kir2.3 channel protein function will be studied. Immunocytochemistry method will be applied to confirm that the Flag-Kir2.3 has expressed on the membrane of the Xenopus oocytes. Results: After examination by sequencing, we were sure that the Flag tag had been inserted into the N-terminal of Kir2.3-pGEMHE. FLAG-Kir2.3 was expressed in the Xenopus oocytes successfully. Channel currents were recorded by TEVC. Immunocytochemistry experiments showed that the Flag tag was fused with Kir2.3 channel protein successfully. Conclusion: FLAG-Kir2.3-pGEMHE, is constructed by means of PCR successfully. Moreover, the Flag tagged protein has expressed stably and Kir2.3 channel function is not affected. These results laid a basis for future research.
Keywords: Molecular pharmacology DNA Recombination Kir2.3 FLAG
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