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silicare(½ð±Ò+2): 2011-07-14 12:40:55
yanhui8558(½ð±Ò+1): 2011-07-14 17:01:43
silicare(½ð±Ò+2): 2011-07-14 12:40:55
yanhui8558(½ð±Ò+1): 2011-07-14 17:01:43
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4Â¥2011-07-14 10:27:08
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3Â¥2011-07-12 03:21:44
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yanhui8558(½ð±Ò+2): 2011-07-14 17:02:13
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yanhui8558(½ð±Ò+2): 2011-07-14 17:02:13
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The reasons may be: • Elution conditions are too mild (histidine-tagged protein still bound): Elute with an increasing imidazole gradient or decreasing pH to determine the optimal elution conditions. • The protein has precipitated in the column: Try detergents or changed NaCl concentration or elute under denaturing (unfolding) conditions (use 4¨C8 M urea or 4¨C6 M Gua-HCl) to remove precipitated proteins. For the next experiment, decrease amount of sample, or decrease protein concentration by eluting with a linear imidazole gradient instead of imidazole steps. • Nonspecific hydrophobic or other interaction: Add a nonionic detergent to the elution buffer (e.g. 0.2% Triton X-100) or change the NaCl concentration. • Concentration of imidazole in the sample and/or binding buffer is too high: The protein is found in the flowthrough material. Decrease the imidazole concentration. • Target protein may not be histidine-tagged as expected: Verify DNA sequence of the gene. Analyze samples taken before and after induction of expression with, for example, anti-His antibodies in Western blotting. • Histidine-tag may be insufficiently exposed: The protein is found in the flowthrough material. Perform purification of unfolded protein in urea or Gua-HCl as for inclusion bodies. |
5Â¥2011-07-14 16:44:28









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