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Colony Cracking: Quick Test for Inserts in Plasmids
ColonyCracking:QuickTestforInsertsinPlasmids
E.colicellscanbedisruptedinanalkalinesolutioncontainingdetergent.ThelysatecontainsenoughDNAtobedetectedinasinglelaneofanagarosegelprovidedthattheplasmidhavepUC-derivedreplicationorigin.Thefollowingprotocolismodifiedfromthatdescribedinthefirstversionof"MolecularCloning"(T.Maniatis,E.F.FrischandJ.Sambrook,ColdSpringHarborLaboratoryPress,1982).(NOTE:Iseldomusethisprocedurenow,sincePCR-basedproceduredescribedhereismorereliable.)
1.Growbacterialcoloniestoalargesize(2-3mm)onanagarmediumcontininganappropriateantibiotic.
2.Usingasteriletoothpick,transferasmallquantityofthecolonytoamasterplate.Transfertheremainderofthecolonytoamicrofugetubecontaining20microlitersof50mMNaOH,0.5%SDS,5mMEDTA(crackingbuffer).
3.Incubatethetubeat55Cfor30min.
4.Vortexvigorouslyfor1min.*
5.AddanappropriateamountofloADIngbuffer**.Loadthecontentsontoanagarosegelwithoutethidiumbromide.Asacontrol,loadtheplasmidvectorwithoutinsertononelane.
6.Afterelectrophoresis,stainthegelbysoakingfor30minutesinasolutionofethidiumbromide(0.5microgram/mlineitherwaterorelectrophoresisbuffer).
7.UnderUV-Illuminator,plasmidDNAshouldbevisIBLebetweenE.coligenomicDNA(20-30kb)andlowmolecularweightRNAs.
*Atthisstep,longgenomicDNAiscutintosmallerpiecesofabout20-30kb.Althoughtheoriginalprotocolin"MolecularCloning"doesnotcontainthisstep,vigorousvortexingisnecessarysincelonggenomicDNAinthelysateistroublesomeinloadingthesampleontotheagarosegel.**Addtheloadingbufferjustbeforeelectrophoresis,sincebromophenolblueisrapidlydegradedinthealkalinesolution.
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