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当前位置: 首页 > 文章 > 鸡γ-干扰素的可溶性表达及纯化产物的抗NDV活性 东北农业大学学报 2011,42 (9) 43-48
Position: Home > Articles > Soluble expression of chicken interferon-gamma and activity of purified expression product against NDV Journal of Northeast Agricultural University 2011,42 (9) 43-48

鸡γ-干扰素的可溶性表达及纯化产物的抗NDV活性

作  者：
代丽;单安山;孙进华;尹佳佳;李远见
单  位：
东北农业大学动物营养研究所
关键词：
鸡γ-干扰素;克隆;可溶性表达;病毒活性
摘  要：
将鸡γ-干扰素(chIFN-γ)基因先克隆,接着通过大肠杆菌表达后进行产物纯化与活性检测。通过PCR方法以带有信号肽的重组质粒PMD-18T-preIFN-γ为模板,扩增无信号肽chIFN-γ基因片段,克隆至原核表达载体pProEXTM HTa,构建重组表达质粒pProEXTM HTa-chIFN-γ,在大肠杆菌BL21(DE3)中经IPTG诱导表达,然后利用Novagen蛋白纯化试剂盒进行天然纯化可溶性蛋白,并进行SDS-PAGE、Western blot鉴定,同时利用CEF-NDV系统测定抗病毒活性。结果表明,459 bp的chIFN-γ成熟蛋白编码基因被成功克隆,同时chIFN-γ蛋白在大肠杆菌中也获得了成功表达,分子质量约为20 ku,能与抗His的单克隆抗体发生特异性反应。表达蛋白一部分形成包涵体,另一部分以可溶形式存在,可溶性蛋白经镍柱在天然条件下的纯化得率约为1.9 mg·mL-1。生物学活性试验表明,1 54稀释纯化的重组chIFN-γ(rchIFN-γ)孵育CEF细胞后能抵抗100TCID50的NDV(新城疫Ⅳ系弱毒苗)攻击。研究纯化获得的rchIFN-γ具有较好的抗病毒活性,为研制新型抗病毒干扰素制剂奠定基础。
译  名：
Soluble expression of chicken interferon-gamma and activity of purified expression product against NDV
作  者：
DAI Li, SHAN Anshan, SUN Jinhua, YIN Jiajia,LI Yuanjian(Institute of Animal Nutrition,Northeast Agricultural University,Harbin 150030,China)
关键词：
chicken interferon-gamma;cloning;soluble expression;antiviral activity
摘  要：
chIFN-γ mature protein gene was amplified by RT-PCR from recombinant PMD-18TpreIFN-γ and then cloned into the prokaryotic expression vector pProEXTMHTa.Recombinant expression plasmid of pProEXTMHTa-chIFN-γ was constructed and then transformed into the competent E.coli BL21(DE3) cells for expression with IPTG induction.Purified soluble rchIFN-γ proteins were obtained by His.Bind Purification Kit(Novagen) and identified by SDS-PAGE gel and Western blot assay.The antiviral activity was detected by CEF-NDV system.A 459 bp cDNA encoding chIFN-γ mature protein gene was cloned and successfully expressed in E.coli with approximate molecular weight of 20 ku,which could be recognized by anti-His mAb against chIFN-γ.The recombinant chIFN-γ proteins were expressed to form inclusion bodies with a portion of soluble protein.The soluble rchIFN-γ proteins were purified by Ni-NTA column under a native condition with the yield of 1.9 mg.mL-1.The purified recombinant chIFN-γ(rchIFN-γ) proteins by 1∶54dilution could resist 100 TCID50 NDV virus attack.There fore,the purified rchIFN-γ proteins by Ni-NTA column under a native condition had better antiviral activity,which will establish a basis for further developing new type antiviral interferon praeparatum.

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