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Preparation of Genomic DNA from Bacteria using Phase Lock GelTM

PreparationofGenomicDNAfromBacteria-usingPhaseLockGelTM

(ModifiedfromExperimentalTechniquesinBacterialGenetics,JonesandBartlet,1990)

Materials:

bulletTEbuffer
bullet10%(w/v)sodiumdodecylsulfate(SDS)
bullet20mg/mlproteinaseK
bulletphenolchloroform(50:50)
bulletisopropanol
bullet70%ethanol
bullet3MsodiumacetatepH5.2
bulletPhaseLockGelTM(5Prime,3Prime,Inc)

1.GrowE.colicultureovernightinrichbroth.Transfer1.5mltoamicrocentrifugetubeandspin2min.Decantthesupernatant.Repeatwithanother1.5mlofcells.DrainwellontoaKimwipe.

2.ResUSPendthepelletin467μlTEbufferbyrepeatedpipetting.Add30μlof10%SDSand3μlof20mg/mlproteinaseK,mix,andincubate1hrat37EC.

3.Addanequalvolumeofphenol/chloroformandmixwellbyinvertingthetubeuntilthephasesarecompletelymixed.CAUTION:PHENOLCAUSESSEVEREBURNS,WEARGLOVESGOGGLES,ANDLABCOATANDKEEPTUBESCAPPEDTIGHTLY.CarefullytransfertheDNA/phenolmixtureintoaPhaseLockGelTMtube(green)andspin2min.

4.Transfertheupperaqueousphasetoanewtubeandaddanequalvolumeofphenol/chloroform.AgainmixwellandtransfertoanewPhaseLockGelTMtubeandspin5min.Transfertheupperaqueousphasetoanewtube.

5.Add1/10volumeofsodiumacetate.Mix.

6.Add0.6volumesofisopropanolandmixgentlyuntiltheDNAprecipitates.

7.SpoolDNAontoaglassrod(orPasteurpipetwithaheat-sealedend).

8.WashDNAbydippingendofrodinto1mlof70%ethanolfor30sec.

9.ResuspendDNAin100-200μlTEbuffer.Completeresuspensionmaytakeseveraldays.

10.StoreDNAat4ECshortterm,-20or-80EClongterm

11.AfterDNAhasdissolved,determingtheconcentrationbymeasuringtheabsorbanceat260nm.

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