湖北大学
硕士学位论文
Toll-like信号途径蛋白质相互作用的研究
姓名:***
阿里巴巴 私有化
申请学位级别:硕士
专业:生物化学与分子生物学
指导教师:***
20070501
摘要
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Toll—like受体识别病原相关的分子模式,主要在调控天然免疫中发挥作用。在肝脏中Toll—like受体激活炎症信号通路如NF—如,JNK,p38和干扰索信号通路,并且起着调控抗病毒、抗细菌应答,病毒感染和伤口愈合的作用。
本文主要针对Toll—like信号途径相关蛋白筛选人类肝脏cDNA文库所得到的新的蛋白质相互作用进行进一步的验证。这三对待验证的相互作用对为:IRF3和SGTA,LBP和PRDX4,Pellin02和TH^P7。
工作主要包括以下内容:
parated(1)以pCDNA3.卜HisA为骨架载体,构建载体Myc-gfp和Flag-man。将编码IRF3,LBP,Pellin02的基因分别克隆到载体Myc-gfp上,并将编码SGTA,PRDX4,TRY7的基因克隆到载体Flag-man。大众翻译
(2)合成超折叠绿色荧光蛋白基因,改造载体pEGFP-C1,用超折叠绿色荧光蛋白基因替换
amway
pEoFP-Cl上的绿色荧光蛋白基因,完成定位载体pSFBFP.C1的改造。并将编码IRF3的基因克隆到载体pSFGFP-Cl上,将编码SGTA的基因克隆到载体pDsRed.C1。
(3)将编码IRF3,LBP,Pellin02的基因分别克隆到载体pGEx上,将编码SGTA,PRDX4,THAP7的基因克隆到载体pET28a上。重组质粒pGEX-IRF3和pGEX-PelIin02转化XLIO-Gold。重组质粒pET'28a—SGTA,pET28a-THAP7转化BL21(DE3),分别接种单菌落培养,并在诱导表达后进行纯化。这四种蛋白能有效地进行表达和纯化。
(4)表达质粒Myc-IRF3,Myc—Pdlm02,Myc—LBP,Hag—SGTA,Hag-THAF7,Flag-PRDX4分别转染HEK293细胞,并通过免疫印记检测6种蛋白的表达。免疫印记结果显示这六种蛋白都能在HEK293细胞中表达。
(5)通过免疫共沉淀验证IRF3和SGTA,LBP和PRDX4,Pellin02和THAP7的之间的互作,结果显示这三对蛋白都能互作。
(6)GST—pulldown验证IRF3和SGTA,Pellin02和THAP7的互作。
(7)利用免疫荧光检测LBP和PRDX4,Pellin02和THAP7在细胞中的定位,并将质粒pSFGFP.IRF3,pDsRed.SGTA共转染Hela细胞验证在细胞中的定
bowling
位。结果显示PRDX4,Pellin02,THAP7,mF3,SGTA都定位于细胞质中,而LBP定位于细胞质或细胞膜上。雅思口语技巧
关键词:Toll-like受体;免疫共沉淀;蛋白质相互作用;超折叠绿色荧光蛋白
Ⅱ
Abstract
Toll··likereceptor(TLRs)recognizepathogen—-associatedmolecularpatternsandarecruciallyinvolvedintheregulationofinnateimmuneresponse.Toll-likereceptorspromoteproinfiammatorysignalingsuchasthenuclearfactor-B,c-Jun-N-terminal
kinase(INK)’p38,andinterferonpathwaysintheliverandregulateantivkalandantibacterialresponses,hepaticinjuryandwoundhealing.
Inthisresearch,newprotein-proteininteractionsinToll-likesignalpathwaywhichwereobtainedbyscreeninglivercDNAlibrarywillbefurthertested.Fordetails,threepairsofprotein-proteininteractionstobestudiedareIRF3andSGTA,LBPandPRDX4,Pellin02andTHAP7.
Severalaspectsmainlyincludedinthisstudyaredescribedasfollows:动词的现在分词
(1)Theplasmidsldye—gfPandFlag-manwereconstructedforco-immunoprecipationbasedonDCDNA3.1-HisA.andtheinterestedgenesencodingforIRF3,LBPandPellin02werecloncdintothevectorMyc—gfprespectively.whilethecorrespondinggenesencodingforSGTA,PRDX4,THAP7wererespectivelyclonedintovectorFlag-man。
(2)Thegeneencodingforsuperfoldergreenfluorescenceproteinwassynthesized,
thenplasmidpSFGFP-C1Wasconstructedforproteinssub。cllularco·-localizationbyreplacing啦geneofpEGFP·C1withsfg在,gene.ThegeneencodingforIRF3wasclonedintothevectorpSFGFP-C1,whilethegeneencodingforSGTAwasclonedintothevectorpDsRed—C1.
法语考试
dgg(3)TheinterestedgenesencodingforIRF3,LBPandPellin02wereclonedintovectorpGEXrespectively,whilethecorrespondinggenesencodingforSGTA,PRDX4,THAP7wererespectivelyclonedintovectorpET28a。TheconstructedplasmidspGEX-IRF3andpGEX—Pellin02weretransformedintoE.coliXLIO-Gold.TheconstructedplasmidspET28a-SGTAandpET28a-THAP7weretransformedintoE.coliB121(DE3)。ThesinglecloneWasrespectivelycultured,andtheculturewasinducedbyadditionofIPTGforexpressionandpurificationoftargetproteins.Itshowsthatthefourproteinscanbeexpressedandpurified.
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(4)ExpressionplasmidsMyc-IRF3,Myc-Pellin02,Myc-LBP,Flag·SGTA,Flag-THAF7,Hag-PRDX4weretransfectedintocelllineHEK293respectively,expressionofthesesproteinswasdetectedbywesternblotting.
(5)TheinteractionsofproteinsIRF3andSGTA,LBPandPRDX4,Pellin02andTHAP7
weretestedbyco-immunoprecipation.ItidentifiedthattheinteractionsbetweenIRF3andSGTA,LBPandPRDX4,Pellin02andTHAP7.
(6)Twopairsofprotein-proteininteractionsIRF3andSGTA,Pellin02andT卧P7wereanalyzedbyGST-pulldown.
f7)Proteinsco-localizationofLBPandPRDX4,Pellin02andTHAP7weretested
byimmunofluoreseence,andplasmidspSFGFP-IRF3andpDsRed-SGTAwereco-UansfectedintocelllineHelafor
testingtheirsub-cellularlocalization.ItshowsthatPRDX4,Pellin02,THAP7,ⅡtF3andSGTAlocateintheCytoplasm,whilethatLBPlocatesintheCytoplasmorcellmembrane.
Keywords:Toll-likereceptor;immunoprecipation;protein-proteininteraction:superfoldergreenfluorescenceprotein
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