巨型引物PCR法对抗CD3改型单链抗体的定点诱变

PROGRESS IN BIOCHEMISTRY AND BIOPHYSICS(2001)

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Abstract
亲和力是影响改型单链抗体应用于临床的重要因素之一.利用巨型引物PCR定点诱变方法,设计并化学合成出两组含多个突变位点的简并引物,在第一轮PCR中使用简并引物分别扩增出含突变碱基的两条特异性的DNA片段,即巨型引物,将其经琼脂糖凝胶电泳分离纯化后,作为3'和5'的两端引物应用于第二轮PCR反应中.通过改变标准PCR反应条件,调整引物与模板的浓度,扩增出特异性较强的目的DNA条带.PCR产物经回收后,进行DNA测序.测序结果表明利用该方法扩增得到特异的抗CD3改型单链抗体的突变体库.
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Key words
anti-CD3 ScFv,site-directed mutagenesis,polymerase chain reaction,megaprimer,slow annealing
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