1.Spindown1.5mlofovernightcultureineppiefor1minuteonhigh. 2.AspriratesupernatantandresUSPendcellpelletin100µlSolutionI(25mMTris-HCl,pH8.0,10mMEDTA). 3.Add200µlSolutionII(0.2NNaOH,1.0%SDS)andmixgentlybyinversion. 4.Add150µlSolutionIII(3MKOAc,pH4.8[60ml5MKOAc,11.5mlHOAc,28.5mlH2O]),vortexbrieflytomix,andspinfor5minutesonhigh. 5.Transfersupernatanttofreshtubecontaining500µlphenol:chloroform,vortexandspinfor5minutesonhigh. 6.Transferaqueouslayertofreshtubecontaining1mlethanol,mixwellbyinversion,andspinfor5minutesonhigh. 7.Removesupernatantandwashpelletwith100µl75%ethanol,spinfor1minute. 8.RemoveasmuchofethanolaspossIBLeanddrytubesbyleavingonbenchwithlidsopenfor~5minutes. 9.ResuspendDNAin40µlof20µg/mlRNaseAH2O. 10.Usefortransformation,restrictiondigestion,sequencing,etc.