Abstract
In order to improve the production of alcohol oxidase (AOX), a recombinant Pichia pastoris (P. pastoris) system was constructed by transformation of the plasmid pPIC9K-AOX into P. pastoris GS115. The effects of different expression conditions on alcohol oxidase activity in the culture supernatant were investigated in the shake flask scale. The results showed that the highest extracellular activity (562 U/L) of alcohol oxidase was obtained after 56 h induction with 4% methanol at OD600 1.0 in the medium containing 50 g/L maltose, which is about 4.2 folds higher than previously reported. High-purity functional recombinant AOX (>90%) was purified from the culture with the Ni-NTA affinity column and Sephadex G-100 chromatographical methods, with a total recovery rate of 68.9%. Further studies showed that the purified rAOX had similar enzymatic characteristics as the native enzyme, except that the thermal stability and resistance to H2O2 inhibition of rAOX were significantly greater compared to the previous report. The purified rAOX was well tolerant to various water-miscible organic solvents. This efficient expression and purification process will be promising for large-scale production of rAOX as an important diagnostic enzyme for alcohol detection in many areas.
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Liu, Y., Pan, J., Wei, P. et al. Efficient expression and purification of recombinant alcohol oxidase in Pichia pastoris . Biotechnol Bioproc E 17, 693–702 (2012). https://doi.org/10.1007/s12257-011-0660-z
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DOI: https://doi.org/10.1007/s12257-011-0660-z