Making GST fusion proteins:(07/19/03)ver.1 Grow up 5ml LB with Amp o/n. Add to 45ml LB with Amp 37o shake 2.5 - 3 hrs,till OD600 0.4-0.8 Put bottles in room temperature water for 10 min to cool down. Add 100μl 0.2M IPTG to 0.4mM final Shake 30℃ 2hr Pellet bacteria,decant sup,invert to drain Resuspend in 1ml NETN 0.2mM PMSF / 50ml LB PMSF,stock 10mM NETN: 20mM Tris-Cl (pH8) 100mM NaCl 1mM EDTA 0.5% NP40 store at 4℃ Vortex to mix well Sonicate at scale 5 for 15sec.Keep on ice.For 10ml Corning tubes,use scale 7 Spin 4℃,5min Transfer supernatant to a new tube. To each lysate,add 60μl 50% Glutathione-Sepharose 4B Pepette 400μl Sepharose stock (75%) Spin 1000rpm 5min,discard supernantant Wash 3x300μl NETN Resuspend in 300μl NETN to get 50% beads Mix in cold room for 2 hours,slowly whirl Pellet beads by brief centrifugation,carefully discard supernatant Wash 3x1ml NETN/PMSF Wash 2x1ml Elution Buffer (50mM Hepes,pH7.9,40mM KCl,1mM EDTA 1mM DTT) Elute proteins by mix beads with 60μl each Elution buffer 5mM Glutathione,(for 10mM,use 3.07mg/ml) 1mM DTT Slowly swirl at RT 1hr Quick spin to pellet,transfer supernatant to a new tube Re-elute with 60μl each NETN 5mM Glutathione 1mM DTT Slowly swirl at RT 30min Quick spin,combine supernatant,spin and transfer supernatant twice to avoid any residual beads.total is 120μl now. Dialyze vs 50% glycerol/10mM Hepes,pH7.5/ 40mM KCl/ 1mM EDTA/ 1mM DTT/ 1mM PMSF in cold room for 2hr or o/n,store at -20℃ Proteins can also be concentrated in a Centriprep-30 concentrator.The pore size of the membrane in the Centriprep-30 allows glutathione to pass into the aqueous compartment.PBS can be added to the protein concentrate and the concentration procedure can be repeated. Thinking aliquot and save at -80℃ Run 12% SDS-PAGE |
→如果您认为本词条还有待完善,请 编辑词条
上一篇氨基酸纤维素薄层层析 下一篇Western Blot
词条内容仅供参考,如果您需要解决具体问题
(尤其在法律、医学等领域),建议您咨询相关领域专业人士。
0