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mTn3xHA/GFP
Uses:Genedisruption,analysisofgeneexpression,creatingfusiontoGFP,HATepitope-taggingproteinatrangeofsites,creatingconditionalalleles. Inmoredetail:mTn-3xHA/GFPcanbeusedeasilytocreatealibraryofinsertions,eachatadifferentsiteinagivengene.ThemutagenizedDNAisthentransformedintoyeast,whereitreplacesthechromosomallocusbyhomologousrecombination.Thetransposoninsertionscreateapoolofinsertion/disruptionalleles.Insertionsthatgeneratein-framefusionofthecodingregiontoGFPcanbeusedtomonitorandquantifygeneexpression,viaassaysforfluorescenceactivity.LocalizationoftheGFPfusionproteincanbeexaminedbyfluorescencemicroscopy.ThetransposoncanalsobeexcizedbyCre-mediatedrecombinationtoleavea5base-pairduplicationcausedbytransposoninsertionplusa274-bpinsertioncontainingsequencesencodingthe3xHAtagandthefactorXaproteasecleavagerecognitionsite.WhenGFPisfusedin-frametothegeneofinterest,theexcisioneventresultsinanin-frameinsertionof93aminoacids,calledaHATtag,intotheencodedprotein.TheHATtagallowsimmunodetectionoftheprotein.InsertionoftheHATtagalsohasthepotentialtocreateconditionally-defectiveformsoftheprotein. TheaccessionnumberformTn-3xHA/GFPisU54830. AkitformutagenesisofayeastgenewithmTn-3xHA/GFPisavailable. Pleasereadthiswholedocumentbeforeyoustart! WehavenotdoneassaysofGFPactivityinyeast. SeeNiedenthaletal(1996)fortheirmethods. WetestedmTn-3xHA/GFPbymutagenesisoftheBDF1gene,whichencodesachromatin-associatedprotein.Wegrewindividualbdf1::mTn-3xHA/GFPtransformantstoadensityof107cells/mlinSC-ura.Thelastfourhoursofgrowthwereatroomtemperature,toallowformationoftheGFPchromophore.ThenweexaminedcellsdirectlyusingaLeitzmicroscopywithasystem13filter(thismaynotbeoptimal).In4of38transformants,wesawgreenfluorescenceofthenucleus.Fixationandspheroplastingofthecellsimprovedthesignal-to-noiseratio. Aleu2ura3GAL+yeaststrainisrequired.Whentransposoninsertionhascreatedanin-framefusiontoGFPinthegeneofinterest,thetransposoncanbeexcizedbyCre-mediatedrecombinationtoleavea274bpinsertion(sequencegivenbelow)containingthe3xHAtag.Withthe5basepairduplicationcausedbytransposoninsertion,thisgivesanin-frame93aminoacidinsertion.ThepopouteventismediatedbycrerecombinaseandrequiresinductionoftheGAL1-10promoterongalactose.Ourstrainsgrowpoorlyongalactosebutgive80to100%popouts. TheHAtripletagcanbedetectedbymousemonoclonalantibodies12CA5(Boehringer)orMMS101R(BAbCo,Richmond,California).Theseantibodyrecognisecross-reactingyeastproteinsofabout55kDor110kD,respectively,andcangiveaspottybackgroundonimmunofluorescence.Despitethisdrawback,the3xHAtaghasbeenusedextensivelyandsuccessfullyinyeast.Arabbitpolyclonalantiseraisalsoavailable(101c500;BabCo)butthiswaslessreactiveintheoneinstancewetried.Protocolsforyeastimmunofluorescencecanbefoundhere,orinMethodsinEnzymology194(1991). N.B.Whentaggingessentialgenes,theoriginalstraintransformedshouldobviouslybediploid.YoucandissecttheHAT-taggedversiontoseeifthetaggedgeneisfunctional.Toberigorous,onlybelieveatagislethalifitiscomplementedbythewild-typegene,andifseveralpopouteventsgivethesamephenotype. TRinuppercase.loxRinbold. GGGGTCTGACGCTCAGTGGAACGAAAACTCACGTTAAGgcggccattgaaggtagaagagaaAATttgtacttccaaagaaagaaggccgctatcgcttcggataactcctgctatacgaagttatgggcggccgtttacccatacgatgttcctgactatgcgggctatccctatgacgtcccggactatgcaggATCCtatccatatgacgttccagattacgctccggccgcCCTTAACGTGAGTTTTCGTTCCACTGAGCGTCAGACCCC TheaccessionforpHSS6isM84115 NB.Whenonlyafewplatesofeachtypeareused,it"sconvenienttochopanLBplateupwithasteriletoothpick,putthebitsinasterileflask,andmelttheagarbymicrowave.Addappropriateamountsofantibioticandrepourplates.mTn-3xHA/GFP
TR Tn3terminalinvertedrepeats Xa FactorXacleavagerecognitionsite loxR loxsite,targetforCrerecombinase GFP geneencodingGreenFluorescentProteinmutantp11 URA3 URA3genefromS.cerevisiae tet Tetracyclineresistancegene res Tn3siteforresolutionoftranspositionintermediate loxP loxsite,targetforCrerecombinase 3xHA Hemagglutinin(HA)tripleepitopetag Shuttlemutagenesis
Screeningforin-frameGFPfusionsinyeast
AnalyzingGFPfusionproteinlocalizationinyeast
UsingtheexisionfeaturetoHAT-epitopetagaprotein
SequenceofHATtag(3xHA):
Bacterialstrainsused(providedinkit):
R1123 StrainXL1-bluecarryingvectorpHSS6. R1236/B211 StrainRDP146(F-recA"dlac-pro)rpsE;spectinomycinresistant)withplasmidpLB101(pACYC184withtnpA;activetransposase,chloramphenicolresistant)(F.Heffron) #111/B428 StrainRDP146withpOX38FfactorderivativecarryingmTn3derivativemTn-3xHA/GFP(GFP,URA3,tet;tetracyclineresistant) #70/B425 StrainNG135(K12recA56gal-delS165strA;streptomycinresistant)withplasmidpNG54(pACYC184withmTn3resandtnpRseqs;activeresolvase,chloramphenicolresistant)(N.Grindley) B227 StrainDH5-alphacarryingpB227/GAL-cre(amp,ori,CEN,LEU2)(B.Sauer) Vectorused:
Antibioticsused:
TetracyclineHCl,Tet(SigmaT3383) 12mg/mlin50%ethanol.Useat3ug/ml(Tet3) Kanamycin,Kan(SigmaK800) 10mg/mlinwater.Useat40ug/ml(Kan40) Chloramphenicol,Cm(SigmaC0378,Ithink) 34mg/mlinethanol.Useat34ug/ml(Cm34) Streptomycin,Sm(SigmaS6501) 10mg/mlinwater.Useat50ug/ml(Sm50) Ampicillin,Amp(SigmaA9518) 50mg/mlinwater.Useat50ug/ml(Amp50)
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