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时间:2019-03-06
《猪α1 干扰素基因的克隆与原核表达》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、中国农学通报2010,26(11):1-6ChineseAgriculturalScienceBulletin猪α1干扰素基因的克隆与原核表达1211杨永胜,陈春花,宋勤叶,左玉柱(1河北农业大学动物科技学院,河北保定071001;2河北省邯郸市动物疫病预防控制中心,河北邯郸056005)摘要:根据猪α1干扰素(pocineinterferon-alpha1,poIFN-α1)的全基因序列(EU364896)设计合成1对特异引物,通过RT-PCR从三元杂交仔猪外周血淋巴细胞扩增出poIFN-α1全基因,将该基因克隆到p
2、GEM-T载体,构建重组质粒pGEM-T-poIFN-α1,进行测序。以pGEM-T-poIFN-α1为模板,经PCR扩增带有酶切位点的poIFN-α1基因,将其定向克隆到原核表达载体pGEX-6P-1中,构建重组表达载体pGEX-6P-poIFNα1,转化大肠杆菌BL21(DE3)进行蛋白诱导表达和鉴定,并确定蛋白最佳表达条件。序列分析表明,克隆的poIFN-α1基因全长546bp,编码181个氨基酸,前23个氨基酸组成信号肽,无糖基化位点。SDS-PAGE和Westernblotting证实重组表达菌经IPTG诱导
3、后,可表达相对分子质量约46ku的融合蛋白(GST-poIFN-α1)。当以1.0mmol/L的IPTG于37℃下诱导表达9h时,蛋白表达量最高。poIFN-α1基因的克隆与表达为进一步研究其抗病毒活性,开发病毒治疗和疫苗免疫增强用生物制剂奠定了基础。关键词:猪α1干扰素;克隆;原核表达;鉴定中图分类号:S852.4文献标志码:A论文编号:2009-2772CloneandProkaryoticExpressionofPorcineInterferon-α1Gene1211YangYongsheng,ChenChunh
4、ua,SongQinye,ZuoYuzhu(1CollegeofAnimalScienceandTechnology,HebeiAgriculturalUniversity,Baodinghebei071001;2HandanCenterforAnimalDiseaseControlandPrevention,Handanhebei056005)Abstract:Apairofspecificprimerforporcineinterferon-alpha1(poIFN-α1)wasdesignedandsynthes
5、izedaccordingtogenesequence(EU364896),andpoIFN-α1genewasamplifiedbyRT-PCRfromperipheralsbloodlymphocytes(PBLC)ofternaryhybridpiglet.ThenpoIFN-α1completegenewasclonedintopGEM-Tvectorandsequenced.Moreover,poIFN-α1genewithenzymesiteswasclonedintoprokaryoticexpressi
6、onvectorpGEX-6P-1toconstructrecombinantexpressionplasmidpGEX-6P-poIFN-α1andtransformitintoE.coliBL21(DE3).RecombinantpoIFNα1wasexpressedandidentifiedwithexpressionconditionsconfirmed.TheanalysisofsequenceindicatedthattheclonedpoIFN-α1geneconsistedof546bpencoding
7、181aminoacidswithasignalpeptideof23aminoacidsbutwithoutglycosylationsite.Theselectedrecombinantexpressedapproximatelya46kufusionproteinwithglutathioneS-transferase(GST)andpoIFN-α1whichwasdemonstratedbySDS-PAGEandWesternblotting.Theamountoffusionproteinreachedthe
8、highestwhentherecombinantswereinducedfor9hourson37℃with1.0mmol/LIPTG.CloneandexpressionofpoIFN-α1genelaidafoundationforthestudyofantiviralactivityandutilizationofpoIF
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