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Inclusion bodies were separated from the cytosolic protein pool by centrifugation at 20,000 g for 30 min, and the inclusion bodies-containing pellet was solubilized with 4 ml of solubilization buffer (6 M Urea, 200 mM NaCl, 100 mM Tris-HCl, pH 8.3), supplemented with 10 ¦ÌM ¦Â-mercaptoethanol and incubated overnight at 4¡ãC under constant rotation. Thereafter, the sample was spun at 25,000 g for 30 min to remove any insoluble material and the His-tagged protein was purified using HisPurTM Ni-NTA Resin

Hope it works with you. Good luck!
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