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Single-step purification of recombinant Gaussia luciferase from serum-containing culture medium of mammalian cells.
Protein Expression and Purification 2018 January
A dihydrofolate reductase-deficient Chinese hamster ovary (CHO-K1/dhfr(-)) cell line stably expressing Gaussia luciferase with a histidine-tag sequence at the carboxyl terminus (GLase-His) was established. Recombinant GLase-His was purified from serum-containing culture medium by single-step Ni-chelate column chromatography in the presence of 2 M NaCl and 0.01% Tween 20. The protein yield of GLase-His with over 95% purity was 0.5 mg from 0.9 L of the cultured medium. The enzymatic properties of purified GLase-His were characterized. Interestingly, non-ionic detergent Tween 20 stabilized and stimulated GLase-His activity and its luminescence activity was stimulated 2-fold by the synergistic effect of 0.01% Tween 20 and 150 mM NaCl.
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