NRCInstituteforBIOLOGicalSciencesTritonX-114extractionprotocol(Hydrophobicproteinpreparation)RessUSPendcellsinSolutionA(dil1/8)andadd15µlofmammaliancocktailproteasesinhibitor(Sigma).Add1thirdofthevolumeofsolutionBIncubateonicefor1hourwithfrequentvortexing.Centrifugeat10000gfor10minutesat4°Ctopelletunbrokencellsandnuclei.TransfersupernatantincleanEppendorfsthenincubateat30°Cfor3minutes(untilslniscloudy).Centrifugeat1300gfor10minutesatroomtemperature.TransferAqueousphaseinneweppendorf(butkeepdetergentphaseatroomtemperature).AddXvolumeoftritonX-114toAqueousphase:VolofAqphase=XvoloftritonX-11424.6Shakewellthenincubate3minutesat30°C(untilcloudy)thentransferontopofdetergentphaseslowly.Centrifugeat1300gfor10minutesatroomtemperature.RemoveAqueousphasewithPipettedowntodetergentinterphase.Precipitatehydrophobicprotein(detergentphase)with10Xvolumeofacetone.Placeovernightat-20°C.Pelletproteinsbycentrifugationatmaxspeedfor10minutesat4°C.RessuspendproteinsinIEFsln(7Murea,2Mthiourea,4%CHAPS,1%DTT)thenprecipitateproteinagainwith10volumeofacetone.Place5-10minat-20°C.Pelletproteinsbycentrifugationatmaxspeedfor10minutesat4°C.AirdrypelletthendissolveproteininIEFsolutionSolution:SolutionA:80mMTris-HCl,pH7.4;1,2MNaCl0,63gTris-HCl3,51gNaClDissolvein30mlofwaterAdjustpHto7.4Adjustvolumeto50mlwithwaterSolutionB:40mMTris-HCl,pH7.4;600mMNaCl;4%tritonX-1145mlofslnAAddtritontohaveafinalconcentrationoff4%4%x10ml=ml[tritonX114]Adjustvolumeto10mlwithwater

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