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柔嫩艾美耳球虫表面抗原SAG7基因的克隆与表达 被引量:1

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摘要 应用RT-PCR方法从柔嫩艾美耳球虫杨陵株的第二代裂殖子总RNA扩增出表面抗原SAG7的基因序列,并将其克隆至pGEM-T easy载体转化DH5a菌中。再用一对特异性引物扩增出N端不含信号肽序列的SAG7基因,经BamHⅠ和HindⅢ双酶切后与同样双酶切的PET-32a(+)连接并转化大肠埃希氏菌BL21(DE3),用PCR方法和双酶切筛选阳性克隆并测序,验证读码框是否正确。将筛选的阳性克隆菌经IPTG诱导,获得了SAG7重组抗原在大肠埃希氏菌中的高效表达,表达量占菌体总蛋白的50%以上,融合蛋白的分子量约为45kDa。菌体经超声裂解后经SDS-PAGE分析,重组抗原是以包涵体形式存在。
作者 李红炳
出处 《云南畜牧兽医》 2011年第6期22-24,共3页
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