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1、溫州醫(yī)學(xué)院碩士學(xué)位論文4.hrlL.11/His蛋白的生物學(xué)活性測(cè)定含10%新生牛血清和2ng/mLhlL6的RPMll640培養(yǎng)液培養(yǎng)IL.6依賴細(xì)胞株T1165,活性測(cè)定前用只含有10%新生牛血清的RPMll640培養(yǎng)液洗滌3次,以除去原培養(yǎng)基中的hlL6。調(diào)整細(xì)胞濃度為1-2×105/mL,接種到96孔平底培養(yǎng)板,每孔加100此,加入不同稀釋度IL.11待檢樣品,100此/孔,每份設(shè)3個(gè)重復(fù)孔。設(shè)含ILll標(biāo)準(zhǔn)品的陽(yáng)性對(duì)照和不加IL.11的陰性對(duì)照。培養(yǎng)48~72h后,每孔加10此MTT,繼續(xù)培養(yǎng)“h,輕輕
2、吸出150皿上清,加入150此二甲亞砜(DMSO),溶解10min后,570nM測(cè)定吸光度值。結(jié)果1.重組質(zhì)粒的構(gòu)建經(jīng)PCR擴(kuò)增的hrlL-11基因片段長(zhǎng)度為510bp,與預(yù)計(jì)大小相符。經(jīng)序列比對(duì)準(zhǔn)確無(wú)誤,無(wú)讀碼錯(cuò)誤。2.重組蛋白表達(dá)純化重組質(zhì)粒pET2la-hrlL一11轉(zhuǎn)化BL-21(DE3)感受態(tài)細(xì)菌,經(jīng)IPTG誘導(dǎo)表達(dá),目的蛋白占菌體總蛋白的20%,主要以包涵體的形式存在,分子量19KD。在Ni.NTA親和層析中采用30--200mmol/L咪唑的梯度洗脫,最后hrlL.11蛋白的純度達(dá)到95%以上。3.
3、重組蛋白Westernblotting鑒定Westernblot結(jié)果證實(shí),目的蛋白是帶有6His標(biāo)簽的IL.11重組蛋白。4.重組蛋白的生物學(xué)活性測(cè)定利用Tl165細(xì)胞體外增殖實(shí)驗(yàn)檢測(cè)hrlL.11生物學(xué)活性,結(jié)果表明,純化蛋白的比活達(dá)lxl06IU/mg,與IL.11標(biāo)準(zhǔn)品相當(dāng)。結(jié)論2溫州醫(yī)學(xué)院碩士學(xué)位論文1.成功構(gòu)建了pET2la-hrIL一11高效表達(dá)質(zhì)粒2.成功制備了純度大于95%的hrIL.11蛋白3.獲得了具有IL.11生物學(xué)活性的hrIL.11蛋白關(guān)鍵詞重組人白細(xì)胞介素11;原核表達(dá);純化;生物學(xué)活
4、性溫州醫(yī)學(xué)院碩士學(xué)位論文ProkaryoticExpressionPurificationandIdentificationofRecombinantHumanIL.11ProteinObjectiveABSTRACTToconstructhumaninterleukin一11(hrlL-11)expressionvectorandexpress,purify,refoldhrlL-11protein,andinvestigateitsbiologicalactivity.MethodsI.Constructio
5、nofhrlL-11expressingplasmidTheDNAencodinghrlL一11wasrequiredbyPCRandinsertedintothevectorpET21a(+).ThehrlL·11proteinwasdesignedtocontainsingle6xHistagatitsC-terminalforpurification.TheexpressionplasmidwasverifiedbyDNAsequencingfrombothdirectionswimT7promoteran
6、dT7terminatorprimers.2.ExpressionandpurificationofhrlL一11proteinE.colicellstransformedwithPET21a(+)containingbaiL一11insertweregrownin500mLLuriabrothmediumwithampicillinat37℃.WhenOD600oftheculturereached0.4.0.6.1mmol/LIPTGWasaddedtoinducebacterialcellstoproduc
7、ehrlL.11protein.Afterincubatedat37℃for4hours,thecellswereharvestedbycentrifI.tgationat10,0009for5minutes.nlepelletWassuspendedin30mLofcelllysisbufferandthendisruptedbysonication.Afterwashing,thepelletswereresuspendedanddissolvedincolumnbuffer,filteredby0.22肛m
8、membraneandpurifiedbyaffinitychromatographyontheNi-NTAcolumn.3.RefoldingofhrlL-11proteinandWesternblottingThepurifiedproteinwasadjustedto50---100Itg/mLandrefoldedbydialysisagainst20volbuf