丝状支原体山羊亚种特异性蛋白基因Mmc-3740的克隆表达和免疫原性分析

Cloning and Expression of Specific Protein Gene,Mmc-3740, of Mycoplasma mycoides

【目的】构建表达丝状支原体山羊亚种特异性蛋白基因Mmc-3740的重组表达菌,为Mmc-3740蛋白的进一步研究与应用奠定基础。【方法】采用PCR技术从Mmc-47中扩增出该基因,进行克隆、测序,将克隆质粒与pET-28a分别双酶切,回收正确的片段进行连接构建重组表达质粒,转化至表达菌BL21(DE3)中,IPTG诱导表达,产物用SDS-PAGE检测,用镍柱对其纯化后免疫小鼠获得高免血清,并进行Western-blot验证。【结果】成功构建了克隆和表达载体,重组菌表达目的蛋白大小约21 ku。表达产物通过镍柱纯化后可得到单一的目的蛋白条带,Western-blot检测结果显示所表达的目的蛋白有较好的免疫原性。【结论】成功在BL21(DE3)宿主菌内表达了Mmc-3740重组蛋白。

【Objective】To construct a recombinant bacterium that expresses the specific gene Mmc-3740 of Mycoplasma mycoides subsp.capri for further study and application of the protein.【Method】Mmc-47 was amplified by PCR,then cloned and sequenced.The cloned plasmids and pET-28 a were undergone a double digestion to recover the correct fragments for ligation and construction of plasmid with the recombinant expression.Verified by sequencing,the plasmid was transformed into the expression strain,BL21(DE3).The expression was induced using IPTG to obtain the products to be identified by SDSPAGE and purified through the nickel affinity chromatography to produce hyperimmune serum against mouse.The serum was then identified by the western-blot for confirmation.【Results】The cloning and expression vectors were successfully established.The molecular weight of the recombinant protein was approximately 21 ku.The expressed product was purified showing an apparent immunogenicity.【Conclusion】The Mmc-3740 recombinant protein was successfully expressed in BL21(DE3)to provide the basis for further study on the functions and characteristics of the gene.