结核杆菌抗原Ag85A基因的克隆及在大肠杆菌中的表达
Journal Title: Di-er Junyi Daxue Xuebao - Year 2008, Vol 29, Issue 2
Abstract
目的:将结核分枝杆菌Ag85A抗原基因克隆并在大肠杆菌中表达。方法:用PCR方法从结核分枝杆菌基因组中扩增Ag85A抗原基因,然后将其插入到原核表达载体pGEX5T中,构建成pGEX5TAg85A重组质粒。经IPTG诱导使该基因在E.coli k802菌中表达,亲和层析法纯化蛋白,Western印迹法验证表达蛋白的抗原性。结果:扩增出了约0.9 kb的单一条带,并成功地构建了pGEX5TAg85A重组子；经IPTG诱导后,Ag85A蛋白在k802菌中获得了表达,表达的蛋白条带大小约58 000,与预期结果相符;纯化后获得了较单一的蛋白条带。蛋白纯化前后均可被结核病患者血清特异地识别。结论:成功地克隆了Ag85A抗原基因,并将其在大肠杆菌中进行了表达、纯化,为将其应用于结核病诊断和防治的研究奠定了基础。
Authors and Affiliations
Qing-min WANG, Shu-han SUN
Keywords
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