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1、江南大學碩士學位論文甘油合成關鍵酶基因CgGPD1在大腸桿菌和產甘油假絲酵母中的表達姓名:王震申請學位級別:碩士專業(yè):微生物學指導教師:饒志明沈微20080801AbstractAbstractGlycerolisallimportantmaterialforthelightandchemicalindustriesNowitiswidelyusedinthecosmetic,toothpaste,tobacco,essence,pri
2、ntingdyeing,textile,paint,leatherpapersyntheticresin,pharmaceutical,foodanddefenseindustriesandasafeedstockfortheproductionofvariouschemicalsCompared謝t11thetraditionalmethods,thezymotechnicshasitsownadventageinthesynthes
3、isofglycer01CandidaglycerinogenesWL20025isaexcellentstrainforglycerolproductionanditsintellectualpropertyrightsbelongstoourlab,theyeasthasseveralusefulproperties,suchastolerancetohighglucoseconcentrations,rapidgrowthanda
4、bilitytoaccumulatehighextracellularglycerolconcentrationIthasbeenappliedtotheglycerolindustrialThestudyshowsthatglycerol3phosphatedehydrogenaseisthekeyenzymeofglyceolsynthesis,themostdirectwaytoincreasetheglycerolproduct
5、ionistooverexpressthegeneofGPDH—GPDIThegeneofglycerol一3一phosphatedehydrogenaseCgGPDlfromCandidaglycerinogeneswasclonedusingPCRonthebaseofpreviousresearch,andconstructedbinaryvectorwithdifferentcopiesofCgGPDI:pCAM3300zeoc
6、inCgGPDl、pCAM3300zeocinCgGPDlCgGPDlandpCAM3300zeocinCgGPDl一CgGPDl一CgGPDlThevectorsweretransformedinEscherichiacoliJM109respectivelyTheexpressionofGPDHofthetransformantscontainingdifferentcopiesofCgGPDIunderdifferentconce
7、ntrationofNaClandglucosewereresearchedTheefficiencyofthegeneralwaytotransformtheCandidaglycerinogenesisverylowbecauseCandidaglycerinogenesisaindustrialstrain,itscellwallistypicalUsingthewayofAgrobacteriumtumefaciensmedia
8、tedtransformation,thetranformants誠tllonecopyCgGPDlwerescreenedandnorminatedCandidaglycerinogenes—CgGPDl(CgG)ThetransformantwithhiIghglycerolproductionwerescreenedandnorminatedCgG8,theexperimentsshowthattheinsertofthegene
9、CgGPDIdidn’tchangethegrowthofCgG8,therateofglucoseconsumptionofCgG8isfasterthanCg;theglycerolproductionofCgG8is1208%higherthanCg;andalso,thefermentaiontimeofCgG8is6hoursshorterthanCg;therateofglycerolsynthesisofCgG8is204
10、9%quickerthanCgDuringthefermentationtheactivityofglycerol3一phosphatedehydrogenaseofCgG8maintainsahighlevelastheCg,,butitishigherthanCg,itindicatesthatthegeneCgGPDlistransferedintoCglycerinogenesandexpressedsuccessfullyKe
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