Abstract
Endostar as a specific drug in treatment of the nonsmall cell lung cancer is produced using Escherichia coli expression system. Plackett–Burman design (PBD) and response surface methodology (RSM) are statistical tools for experimental design and optimization of biotechnological processes. This investigation aimed to predict and develop the optimal culture condition and its components for expression and secretion of endostar into the culture medium of E. coli. The synthetic endostar coding sequence was fused with PhoA signal peptide. The nine factors involved in the production of recombinant protein—postinduction temperature, cell density, rotation speed, postinduction time, concentration of glycerol, IPTG, peptone, glycine, and triton X-100—were evaluated using PBD. Four significant factors were selected based on PBD results for optimizing culture condition using RSM. Endostar was purified using cation exchange chromatography and size exclusion chromatography. The maximum level of endostar was obtained under the following condition: 13.57-h postinduction time, 0.76 % glycine, 0.7 % triton X-100, and 4.87 % glycerol. The predicted levels of endostar was significantly correlated with experimental levels (R 2 = 0.982, P = 0.00). The obtained results indicated that PBD and RSM are effective tools for optimization of culture condition and its components for endostar production in E. coli. The most important factors in the enhancement of the protein production are glycerol, glycine, and postinduction time.
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Acknowledgments
The authors are so thankful to their colleagues at Tuberculosis and Lung Disease Research Center of Tabriz University of Medical Sciences. The authors are thankful to their coworkers in the Drug Applied Research Center of Tabriz University of Medical Sciences. We thank Dr. Sarvin Sanyi for assistance in editing this manuscript.
Authors’ contributions
This work was a part of Ph.D. thesis of Abbas Mohajeri and he wrote the paper. Nosratollah Zarghami was the supervisor of the thesis that edited the manuscript, directed the research, and coordinated the study. Abbas Mohajeri performed plasmid design and molecular works, carried out the analysis, and wrote the manuscript draft. Younes Pilehvar-Soltanahmadi participated in practical activities. Jalal Abdolalizadeh and Farhad Kiafar participated as technical assistance advisor. All the authors read and approved the final manuscript.
Funding/Support
This research was financially supported by a grant (Project Number 5/76/520) from the Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences. Tabriz, Iran.
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Mohajeri, A., Abdolalizadeh, J., Pilehvar-Soltanahmadi, Y. et al. Expression and Secretion of Endostar Protein by Escherichia Coli: Optimization of Culture Conditions Using the Response Surface Methodology. Mol Biotechnol 58, 634–647 (2016). https://doi.org/10.1007/s12033-016-9963-9
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DOI: https://doi.org/10.1007/s12033-016-9963-9