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1、生物技術(shù)通訊??一-一,LETTERSINBIOTECHNOLOGYVol.·21No.·4Jut.‘,.2010497doi:10.3969/j.issn.1009—0002.2010.04.O11研究報(bào)告沙門茵外膜蛋白D的原核表達(dá)及多克隆抗體制備郭曉雅,師長(zhǎng)宏,邵成,趙勇,史皆然第四軍醫(yī)大學(xué)a.西京醫(yī)院呼吸內(nèi)科;b.實(shí)驗(yàn)動(dòng)物中心;陜西西安710032[摘要]目的:在大腸桿菌中表達(dá)沙門菌外膜蛋白(OMP)D,純化后制備兔抗OMPD抗體。方法:用PCR方法從鼠傷寒沙門菌中擴(kuò)增出ompD基因,并插入融合表達(dá)載體pET一28a(+)的多克隆位點(diǎn),構(gòu)建重組表達(dá)質(zhì)粒pET28a(+)一o
2、mpD;以重組質(zhì)粒轉(zhuǎn)化大腸桿菌BL21(DE3),篩選陽(yáng)性重組菌株,經(jīng)IG誘導(dǎo)目的蛋白表達(dá),在變性條件下對(duì)目的蛋白進(jìn)行親和層析純化;以表達(dá)的0MPD蛋白免疫家兔,制備抗OMPD的多克隆抗體并進(jìn)行鑒定。結(jié)果:擴(kuò)增了ompD基因,測(cè)序證實(shí)正確后亞克隆于表達(dá)載體pET一28a(+)中,經(jīng)PCR篩選和酶切鑒定獲得陽(yáng)性克隆,經(jīng)誘導(dǎo)在大腸桿菌中表達(dá)出相對(duì)分子質(zhì)量為40xlO。的目的蛋白并進(jìn)行純化;純化的OMPD免疫家兔后,能有效地刺激特異性抗體的產(chǎn)生,抗血清的效價(jià)達(dá)到1:10000以上,且具有良好的特異性。結(jié)論:構(gòu)建ompD基因的原核表達(dá)載體,并在大腸桿菌中獲得高效表達(dá);制備出兔抗OMPD抗
3、體,效價(jià)及特異性均良好,為進(jìn)一步制備腸黏膜高親和力疫苗奠定了基礎(chǔ)。[關(guān)鍵詞]外膜蛋白D;沙門菌;原核表達(dá);多克隆抗體[中圖分類號(hào)]Q78;R392.1[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)]1009—0002(2010)O4—0497—04ProkaryoticExpressionofSalmonellaOuterMembraneProteinDandDevelopmentofitsPolyclonalAntibodyGUOXiao—Y,SHIChang-Hong~,SHA0Cheng~,ZHA0Yon,SHIe—Ranaa.RespiratoryMedicineDepartmentofXi
4、jingHospital;b.LaboratoryAnimalCenter;FourthMilitaryMedicalUniversity,Xi"an710032,China[Abstract]Objective:ToobtainSalmonellaoutermembraneprotein(OMP)DexpressedinE.coliBL21(DE3)forproducingitspolyclonalantibody.Methods:TheompDgeneamplifiedfromS.typhimuriumbyPCRwasinsertedintoexpressionplasmid
5、pET-28a(+)toconstructrecombinantplasmidpET一28a(+)一ompD.Therecombinantplas—midwastransformedintoE.coliBL21(DE3)fortheexpressionOMPDunderIPTGinduction.TheproteinOMPDwaspurifiedwithNi+-NTAsystemandusedtoimmunizerabbitstoprepareanti—OMPDantibody,andtheanti—body'spropertieswereidentified.Results:T
6、heSalmonellaompDgenewasconfirmedbyDNAsequencing,andpositiverecombinantcloneswereidentifiedbyrestrictionenzymedigestionanalysisandDNAsequencing.Afterin—ductionwithIPTG,OMPDwithMrbeing40kDawasexpressedinE.coliBI21(DE3)andwaspurified.Rabbitpolyclonalantibodywithagoodspecificitywasobtained,andthe
7、titerwasaboveof1:10000.Conclusion:TherecombinantexpressionplasmidofOMPDwasconstructedsuccessfullyandexpressedinE.coli.Thepreparedrab—bitanti—OMPDantibodyhadahightiterandspecificity,whichlaidafoundationforthepreparationofintestinalmucosaimmuno