耐熱堿性磷酸酶的亞克隆和耐熱機(jī)制的研究.pdf_第1頁
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1、復(fù)旦大學(xué)碩士學(xué)位論文耐熱堿性磷酸酶的亞克隆和耐熱機(jī)制的研究姓名:白曉陽申請學(xué)位級別:碩士專業(yè):遺傳學(xué)指導(dǎo)教師:毛裕民2001.5.18FudanUniversityGraduateThesissubcIoningandThermostabilityMechanismStudyonThermostableAlkalinePhosphataseAbstractOurlabhasscreenedandclonedthegenecodingfo

2、rthermostablealkalinephosphatase(TAP)fromthermophileThermussp3041ThispaperconcentratesOOthefollowingworkwiththermostablealkalinephosphatase:24Withmolecularcloningmethod,aseriesofmutantswereobtainedwith24,25,26and27aminoa

3、cidsdeletedinFD—TAPN—terminalsignalpeptidesequenceamongwhichmutantsTAPND25,1APND26and1APND27getenhancedexpressionlevelinEcoliThemutantproteinTAPND27wasinducedandpurifiedthroughaseriesofproceduresThepurificationefficiency

4、wasabove90%withaspecificactivity9736U/mgKmvalueiS1281O~mol/m1anditiShighlythermostablewithaTmvalue91℃WefonndthationandsolventpHinfluenceTAPND27activityandthermostabilityAftertreatmentwithEDTAtheiondeprivedTAPND27complete

5、ly10NeSitsthermostabilitywithgreatchangeinitssecondarystructureThatsuggeststhatTAPNl3127iSanionenzymeTheremaybeion~bindingsitesinthestructureTAPND27iSthermostableunderawiderangeofpHfrom65to80Whileitsthermostabilitydecrea

6、sesdramaticallywhenpHiSbelow65WefoundthatinorganicphosphateCangreatlyimproveTAPND27thermostabilityInthepresenceof10mmol/LPiitsTmwasenhancedfrom91℃to97℃EnzymatickineticexperimentshowsthatPiiSareversiblecompetitiveinhibito

7、rofTAPND27withKivalue099104mol/LnleresultsindicateaPibindingsiteintheenzymeCDspectrumscanninghasmeasuredTAPND27secondarystructurechangesinphosphatebuffer(pH8O)duringheatdenaturation,whichiSquitedifferentfromthatofTAPND27

8、inTris—HClbufrer(pH8O),indicatingthatproteinthermostabilitycloselyrelatestoitssecondarystructureTheTAPND27crystallizationconditionswerescreenedusinghangingdropvapordiflusionmethodCrystalsusedforX—raydiffractiondatacollec

9、tionweregrownagainstreservoirscontaining40mmol/LMgCl2,100mmol/LHepesBufferfpH75,298K),285%(W,V)polyethyleneglyc01Andtheygrewtomaximumdimensionsof080501mmXraydifiractiondataarecollectedto254AItwasfoundthatthecrystalsbelon

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