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酵母單雜交系統(tǒng)ClontechpHis2說明書DescriptionpHIS2isareportervectorthatcanbeusedinyeastone-hybridassaystoidentifyandcharacterizeDNA-bindingproteins.ThevectorwasspecificallydesignedforusewiththeBDMatchmakerOne-HybridLibraryConstruction ScreeningKit（#K1617-1）.ItcontainsaHIS3nutritionalreportergene,locateddownstreamofamultiplecloningsite（MCS）andtheminimalpromoteroftheHIS3locus（PminHIS3）.Cis-actingDNAsequences,orDNAtargetelements,canbeinsertedintotheMCSandusedasbaitstoscreenGAL4AD/cDNAfusionlibrariesforproteinsthatinteractwiththetargetsequence.Aprotein-DNA（orone-hybrid）interactioncanbedetectedbyperformingtheassayinayeaststrainsuchasY187thatisauxotrophicforhistidine.Positiveone-hybridinteractionsdriveexpressionoftheHIS3reportergene,whichenablesthehostcelltogrowonhistidine-deficientmedia.Intheabsenceofactivation,theconstitutiveHIS3expressionfromPminHIS3isverylow.Duringlibraryscreening,theleakyexpressionofHIS3iscontrolledbyadding3-amino-1,2,4-triazole（3-AT）tothemedium.Theconcentrationof3-ATneededtofullysuppressleakyHIS3expressionmustbedeterminedempiricallyforeachDNAtargetelement.pHIS2canbemaintainedinbothyeastandbacteria.Itcontainsanautonomousreplicationsequence（ARS4）andTRP1nutritionalmarkerforreplicationandselectioninyeast（1,2）;itcontainsaColE1originandakanamycinresistancegene（Kanr）forpropagationandselectioninE.coli.ThecentromericsequenceCEN6ensurespropersegregationoftheplasmidduringcelldivisioninyeast（1,2）.UseTousepHIS2inaone-hybridassay,cloneoneormorecopiesofacis-actingDNAtargetsequenceintotheMCS.ThenintroducetheplasmidintocompetentyeastcellsusingthetransformationprotocolintheBDMatchmakerLibraryConstruction ScreeningKitsUserManual（PT3529-1）.IncontrasttotheoriginalBDMatchmakerOne-HybridSystem,thisreportervectordoesnotneedtobeintegratedintotheyeastgenome.Instead,itismaintainedasanepisomethroughouttheassay.InsertingyourtargetelementmayalterthelevelofbackgroundHIS3expression.Therefore,constructsshouldbetestedforbackground（leaky）HIS3expressionbeforeyoustartaone-hybridanalysis.BackgroundgrowthduetoleakyHIS3expressioniscontrolledbyadding3-ATtotheselectionmedium,asdescribedintheUserManual（PT3529-1）.LocationofFeaturesMultiplecloningsites:141HIS3gene:152811FragmentcontainingtheHIS33'UTR Terminationsequence:8121446TRP1gene:28553529FragmentcontainingtheColE1E.colioriginofreplication:41654615Kanamycin-resistancegene:56054811CEN6/ARS4sequences:62545737

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