DGK Membrane Preparation相关交流-蚂蚁淘在线

DGK Membrane Preparation

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Contributor:SupryaJayadevDate:Dec.10,1992Reagents:BacterialstrainE.coliN4830/pJW10LBampmedia50µg/mlampicillinHighsaltbufferfor1L50mMKH2PO46.8g150mMKCl11.18g50mMsodiumpyrophosphate(Na4P2O7-10H2O)22.3g5mMNa2EDTA1.86g5mMb-mercaptoethanol390µlTNEbufferfor1L25mMTris3.03g100mMNaCl5.84g1mMNa2EDTA(pH8.0)0.37g5mMb-mercaptoethanol390µlTEMbufferfor1L25mMTris3.03g1mMNa2EDTA(pH8.0)0.37g5mMb-mercaptoethanol390µl

1)Thawcells.2)Innoculate10mlofLBampmediaandgrowcellsovernight@32°C3)Aliquot1mlofcultureforglycerolpermeant,storeat-80°C.4)Pourremainingprecultureinto300mlofLBbroth.-->NOTE:SetasidesomeLBinordertozerothespectrophotometer.5)Growcellsat32°CcheckingOD600every1/2hour.6)Whenabsorbancereaches1,switchcultureto42°Ctoinduceenzymeactivity.7)Growcellsfor1.5to2hoursat42°C.8)Harvestbyspinningcellsdownat5,000xgfor20minutes.9)ResUSPendpelletin150mlofTNEbufferandcentrifugeat5,000xgfor20minutes.-->NOTE:Pelletscanbefrozenatthispointifneccessary.10)Resuspendpelletin150mlofhighsaltbuffer.11)RupturecellsusingaFrenchpresstwotimes.-->SettingsforFrenchpress:12,000psi,762gauge.12)Spinhomogenateat5,000rpm(7,000xg)for15minutesusingtheSS-34rotor.-->Thisstepremovesanyunbrokencellsandlargedebris.13)Pelletmembranesbyspinningsupernatantat200,000xgfor90minutes(48,000rpminBeckmanTi50.2).14)Resuspendpelletin5mlofTNEbufferusingaPasteurpipet,vortexandpassthrough18Gspinalneedle.15)Bringvolumeupto150mlwithTNEbuffer.16)Spinat200,000xgfor60minutes(asabove).17)Resuspendin5mlofTEM,homogenize12-15strokesinordertoresuspendcompletely.18)Doaproteindeterminiation,shouldhaveaconcentrationof~10mg/mlprotein.19)Aliquotmembranesuspensionsandstorein-80°Cfreezer.

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DGK&nbsp;Membrane&nbsp;Preparation

DGK Membrane Preparation