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1、·276·中國神經(jīng)免疫學和神經(jīng)病學雜志201i年7月第18卷第4期ChinJNeuroimmunol&Neurol2011,Vo1.18,No.4人AChR—Fc融合蛋白真核表達載體的構(gòu)建和表達常婷林宏劉煜李柱一摘要:目的構(gòu)建含人AChRal亞單位胞外段(Hal一210)一IgG1Fc融合基因的真核表達載體,表達人AChR—Fc融合蛋白。方法擴增Hal-210基因,插入含有CMV啟動子、小鼠Kappa鏈先導序列以及人IgG1從鉸鏈區(qū)到CH3基因片段的真核表達載體pAN1782中,構(gòu)建重組表達載體pAN—Hal一210,并經(jīng)酶切、測序鑒定;采用脂質(zhì)體
2、法將重組載體轉(zhuǎn)染CHO-K1細胞,經(jīng)G418加壓篩選、ELlSA檢測,挑選高表達融合蛋白的陽性轉(zhuǎn)化子擴大培養(yǎng);表達的AChR—Fc融合蛋白經(jīng)ProteinA親和層析柱純化,SDS-PAGE、Westernblot鑒定。結(jié)果酶切及測序結(jié)果證實Hal一210基因序列正確,真核表達載體pAN—Hal一210構(gòu)建成功;ELISA檢測證實\ChR—Fc融合蛋白在細胞培養(yǎng)上清中呈分泌表達;SDS-PAGE結(jié)果顯示該融合蛋白的相對分子質(zhì)量約為5【000;Westernblot結(jié)果顯示該融合蛋白能被特異性單克隆抗體mAb198所識別。結(jié)論成功構(gòu)建pAN—Hal一2
3、1O真核表達載體,并獲得具有生物活性的AChR—Fc融合蛋白,為進一步開展融合蛋白靶向B細胞治療重癥?。篔己力的研究奠定了基礎(chǔ)。關(guān)鍵詞:重癥肌無力;融合蛋白;真核表達;CHO—K1細胞中圖分類號:R746.1文獻標識碼:A文章編號:1006—2963(2011)04—0276—04ConstructionandexpressionofafusionproteincontainingextracellulardomainofhumanAChRalandFcfragmentofhumanIgG1CHANGTing,LINHong,LJUY,LZhu—y
4、i.DepartmentofNeurology,TangduHospital,gFourthMilitaryMedicalUniversity,Xi’anShaanxi710038,ChinaCorrespondingauthor:LIZhu~yi,Email:lizhuyi@fmmu.edu.cn.ABSTRACT:ObjectiveToconstructeukaryoticexpressionvectorcontainingtheextracellulardomainofthehumanAChRM—subunit(Hal一210)andFcfr
5、agmentofhumanIgG1,andtoexpresshumanAChR—Fcfusionprotein.MethodsTheextracellulardomainofHal一210wasamplifiedandinsertedintopAN1782eukaryoticexpressionvectorwithacytomegaloviruspromoter,amurineimmunoglobulini~-chainleadersequenceandthehumangenomicIgG71constantregionfromthehingeto
6、theendofCH3.RecombinantexpressionvectorpAN—Hal一210wasconstructedandevaluatedbyrestrictionenzymeanalysisandsequencing.TherightpAN—Hal一210plasmidwastransfectedintoCHO—K1cellswithlipofectinreagentandselectedbyG418.Thepositiveclonewithhighexpressingfusionproteinwereselectedthrough
7、ELISAdetectionandcultured.AfterpurifiedbyproteinAaffinitycolumnchromatography,theAChR—FcfusionproteinwasidentifiedbySDS_PAGEandWesternblotassay.ResultsRestrictionenzymeandsequencingindicatedHal一210genesequencewascorrectandpAN—Hal一210hadbeenconstructedsuccessfully.AChR—Fcfusion
8、proteincouldbedetectedbyELISAassayintheCHO-K1culturesupernata