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1、中國(guó)農(nóng)業(yè)大學(xué)碩士學(xué)位論文大豆苯丙氨酸解氨酶基因克隆、表達(dá)與活性鑒定姓名:宋柬申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):食品科學(xué)與工程指導(dǎo)教師:陳尚武20060601AbstractPhenylalanineammonialyase(PAL,EC4315)isthefirstessentialenzymeofphenylpropanoidmetabolisminplantAllbiomasscontaining妞曲enylpropaneskeletonar

2、esyntheisedbythispathwaydirectlyorindirectlyPALasalinkoftheprimarymetabolismandthephenylpropanesecondarymetabolism,notonlyhastheveryvitalroleregardingphysiologicalmetabolismandtheresistanceofadversestressinplantalsohasth

3、egreatpracticalsignificanceandtheapplicationvalueinmedicalapplicationandfinechemicalindustryOurcountryisthesourceareaofcultivatingsoybean(Olycinemax),hasmolethan5000yearscultivationhistoryThesoybeanisoflavonesrelyingonph

4、enylpropanemetabolismpathwayhavemultiplehealthcarefunctionandpharmacologicalactions,Inordertofurtherunderstandingthepropanoidpathwayandindepthutilizingoursoybeanidioplasmresources,thenativecultivatedsoybeanofnorthernChin

5、aWasusedasthestartingmaterialtoclonethePALcompletegenefromthegenomicDNA,thenexpressedinSaccharomyceseerevisiaestrainFY834andPALwasnoactiveSplicingbyOverlapExtension(SOE)methodWashiredasgenerecombinationtechnologytogetoff

6、theintronfromfulllengthPALgenethenobtainedGMPALexonEscherichiacobexpressionvectorpETGMPALWasconstructedandWassuccessfullyexpressedin晟cellBL21(DE3)strains,Molecularwei贍toftheexpressedPALproteinWasestimatedtobe779KDandthea

7、mountsofPALproteinexpressionlevelWas8%intotalEcellsolubleproteinsbySDSPAGETheresultofpeptidemassfingerprinting(PMF)showedthattheproteinscorewas84andgreaterthan78signficantlyonp005totheGtycinemaxPALbymatrixassistedlaserde

8、sorptionionizationtimeofflightmassspectroscopy(MALDITOFMS)CatalyticactivityofconversionLlphenylalanineintocinnamicacidbythe點(diǎn)coRexpressedrecombinantGMPALwasachieved甜highspeciticactivi銣坤to21179molg1proteinmin~(3529I_tkatk9

9、1)’higherthanparsleyrecombinantPAL,andRhotodotorulaglutimPAL,苫hekineticcharacteroftherecombinantGMPALWasassayedTheVm“WaS349nmolL。。min“andKmWas1054mmolL~byHaneswWoolfplotUndertheconditionofpH100,15%cinnamieacidand8reel誓‘N

10、Hs,LPheWasobtain秘bycatalyseoftheGMPAL,asthereve[sereactionofLPhetocinnamieacidTheconversionrateofcinnamicacidintoL。Phereached398%ResultsindicatedthatsoybeanrecombinantPALWasefficientlyexpressedinEcobasfullyactivatedfunct

11、ionalenzymeTheexperimentalresultsindicatedthatthesoybeanrecombinationPALthroughexpressionvectorpETGlvtPALWasefficientlyexpressedin最coti矗sfullyactivatedfunctionalenzyme。Itprovidestheresearchfoundationforthefurtherfoodandt

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