Abstract
Pichia pastoris expression system was introduced with post-translation process similar to higher eukaryotes. Preliminary studies were performed toward process intensification and magnetic immobilization of this system. In this experiment, effects of magnetic immobilization on the structure of recombinant protein were evaluated. P. pastoris cell which express human serum albumin (HSA) was used as a model. The cells were immobilized with various concentrations of APTES coated magnetite nanoparticles. HSA production was done over 5 days induction and structure of the product was analyzed by UV–vis, fluorescence, and ATR-FTIR spectroscopy. Second derivative deconvolution method was used to analyze the secondary structure of HSA. P. pastoris cell that were immobilized with 0.5 and 1 mg/mL of nanoparticles were produced HSA with intact structure. But immobilization with 2 mg/mL of nanoparticles resulted in some modifications in the secondary structures (i.e., α-helixes and β-turns) of produced HSA. Based on these data, immobilization of P. pastoris cells with 0.5 or 1 mg/mL of nanoparticles is completely efficient for cell harvesting and has any effect on the structure of recombinant product. These findings revealed that decoration of microbial cells with high concentrations of nanoparticles has some impacts on the structure of secretory proteins.
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Acknowledgements
This experiment was financially supported by Shiraz University of Medical Sciences as PhD thesis proposal of Seyedeh-Masoumeh Taghizadeh submitted at No. 18588 in the School of Pharmacy. Authors are grateful to the support provided by the University of Waikato, New Zealand.
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Taghizadeh, SM., Ghoshoon, M.B., Berenjian, A. et al. Impacts of Magnetic Immobilization on the Recombinant Proteins Structure Produced in Pichia pastoris System. Mol Biotechnol 63, 80–89 (2021). https://doi.org/10.1007/s12033-020-00286-4
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DOI: https://doi.org/10.1007/s12033-020-00286-4