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来源:百度知道 编辑:UC知道 时间:2024/05/30 06:17:30
本实验以大肠杆菌(TG1)基因组作为模板,利用分子生物学方法,应用PCR技术从大肠杆菌中克隆出腺苷甲硫氨酸合成酶的编码基因metK,并将PCR回收产物连接到T克隆载体后转化E.coli DH5a做基因文库,连接到高表达载体PET28a后导入E.coli BL21(DE3)中进行大量地表达。再通过构建融合及天然蛋白表达载体的metK基因PCR扩增产物在1%的琼脂糖凝胶上电泳,说明重组基因是否准确;通过对构建融合蛋白的克隆载体,表达载体及用于构建天然蛋白的克隆载体和表达载体的双酶切凝胶电泳分析,说明目的基因的准确载入;通过蛋白质SDS-PAGE,表明纯化蛋白亚基相对分子质量为43kD左右;通过对添加了各种重组大肠杆菌SAM合成酶进行酶促反应的反应液HPLC检测,说明构建的融合蛋白并未影响酶的活性,可以正常地催化底物甲硫氨酸及ATP酶促合成SAM。

This experiment (TG1) the genome team takes the template by the backwoods coli, the use molecular biology method, applies the PCR technology to clone the adenosine methionine synzyme from the backwoods coli code gene metK, after and connects the PCR recycling product the T cloning vehicle, transforms E.coli DH5a to do the gene bank, after connecting high expression vector PET28a, inducts E.coli in BL21(DE3) to carry on expresses massively. Again the expression vector through the construction fusion and the natural protein metK gene PCR to increase the product on 1% agarose gelatin the electrophoresis, the explanation recombination gene to be whether accurate; Through to constructs the fusion protein the cloning vehicle, the expression vector and uses in constructing the natural protein the cloning vehicle and the expression vector the double enzyme to cut the gel electrophoresis analysis, explains the goal gene accurate load; Through protein SDS-PAGE, indicated that the purification