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1、1064細(xì)胞與分子免疫學(xué)雜志(ChinJCellMolImmuno1)2013,29(10·論著·文章編號:1007—8738(2013)10—1064—04定點突變和隨機突變PCR構(gòu)建噬菌體突變次級抗體庫方法的比較劉洋,余洋,王巖,趙煒疆(汕頭大學(xué)醫(yī)學(xué)院神經(jīng)科學(xué)中心,廣東汕頭515041)[摘要]目的以突變TomlinsonI庫中篩選的抗細(xì)胞黏附分子L1的胞外區(qū)單鏈抗體為例,對定點突變和隨機突變兩種構(gòu)建噬菌體抗體次級庫的方法進(jìn)行比較。方法設(shè)計定點突變和隨機PCR引物在基因水平經(jīng)PCR、酶切、連接將已有噬菌粒引入突變后轉(zhuǎn)染大腸桿菌構(gòu)建噬菌體次級抗體庫;之后使用噬菌體ELISA確定
2、陽性單克隆比例,采用皮爾森X2檢驗進(jìn)行比較。結(jié)果兩種方法構(gòu)建的次級抗體庫庫容分別為1.4X10pfu/mL和2.5×10pfu/mL,兩庫陽性單克隆比例分別為32.5%和35.5%,二者相比差異無統(tǒng)計學(xué)意義(P>0.05)。結(jié)論兩種突變方法都有望獲得高親和力的抗體。[關(guān)鍵詞]定點突變PCR;隨機突變PCR;噬菌體次級抗體庫;單克隆[中圖分類號]R392.11,Q754,Q782[文獻(xiàn)標(biāo)志碼]AComparisonofsite-mutatedanderror-pronePCRmethodsforconstructingthesecondaryphageantibodylibrari
3、esLIUYang,YUYang,WANGYan,ZHAOWeijiangCenterforNeuroseienee,MedicalCollege,ShantouUniversity,Shantou515041,ChhaalAbstractlobjectiveTocomparesite-mutatedPCRanderror-pronePCRmethodsinconstructingthesecondaryphageantibodylibrariesderivedfr0maprimaryextracelulardomainofcelladhesionmoleculeL1(L1-ec
4、d)bindingsingle-chainvariablefragment(scFv)antibody.MethodsSecondarymutantphagelibrarieswereestablishedbytransfectingthemutatedphageattheDNAIeveltoEcoliTG1withdesignedsite-mutatedPCRorerror-pronePCRprimers.Usingtheselectedphagemidasthetemplate,themutatedplasmidwasamplifiedbyPCRandthenconstruc
5、tedwithrestrictionenzymecuttingandIigation.Phage-basedELISAwasusedtocalculatetheratiosofthepositivemonoclonesfromthetwoIibrariesandtheresultswerestatisticallycomparedusingthePearsonmethod.ResultsThesizeofthetwoIibrarieswere1.4×10。pfu/mL(site-mutatedlibrary)and2.5X10。pfu/mL(error-pronelibrary)
6、,respectively.Theratiosofpositivecloneswere32.5%and35.5%.respectively.ThePvaluewas0.67。showingnosignificantdiference.ConclusionThesetwomethodscanbewidelyusedtoobtainantibodieswithahighaffinityonthebasisoftheexistingphageantibody.[Keywords]site-mutatedPCR;error-pronePCR;secondaryphage-displaya
7、ntibodylibrary;monocJone隨著人們對抗體研究的不斷深入,基因工程抗熱點。噬菌體展示技術(shù)將抗體分子簡化為包含可變體以其可規(guī)?;a(chǎn)等優(yōu)點得到越來越廣泛的應(yīng)用。區(qū)的片段導(dǎo)人噬菌體基因組中,通過噬菌體表達(dá)單人源抗體庫篩選技術(shù)作為基因工程抗體的一種,能鏈抗體于噬菌體蛋白表面以用于快速篩選。同時該夠高效快速的在體外找到與特異性抗原結(jié)合的抗體。技術(shù)結(jié)合PCR等技術(shù)可方便有效的在體外實現(xiàn)突細(xì)胞黏附分子L1(celladhesionmoleculeL1,L1CAM)變,以增