Abstract
In this study, the cDNA of mature bovine interferon-α (BoIFN-α) gene was cloned and expressed in the Escherichia coli expression system. Total RNA was extracted from bovine liver cells and reverse transcribed into cDNA, and then BoIFN-α gene fragment was amplified with specific primers by PCR method before being ligated into the pET-32a (+) expression vector. Since the pET-32a (+) plasmid expresses the thioredoxin A (TrxA) tag protein, it can increase the solubility of the target protein. In order to express the target protein, the pET-32a-BoIFN-α recombinant plasmid was transformed into E. coli Rosetta (DE3) strain followed by IPTG induction. It was found that the recombinant fusion protein Trx-rBoIFN-α was finally expressed in a soluble form in the host cell, accounting for about 33.45% of the total cellular protein. The protein was purified by two-step chromatography, including Ni2+-chelating Sepharose affinity chromatography and DEAE anion exchange chromatography. The purity of the purified product reached 93.0%, and the cytopathic effects (CPE) inhibition method was adopted to determine the antiviral activity of the expressed fusion protein in vesicular stomatitis virus/ Madin-Darby bovine kidney cells titration system. The specific activity of the recombinant fusion protein Trx-rBoIFN-α was measured as (3.6 ± 0.25) × 106 U/mg. After cutting of the Trx tag protein by enterokinase digestion, the remaining solo protein was confirmed as rBoIFN-α protein by Western blot assay. These findings will enable us to produce a large number of bioactive rBoIFN-α protein for future application.
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ACKNOWLEDGMENTS
The authors are grateful to all the Research Staff in Wuhu Interferon Bio-products Industry Research Institute Co., Ltd (Wuhu, Anhui, P.R. China) for technical assistance.
Funding
This research was funded by the programs from the National key R&D Program of China (Grant nos. 2017YFD0500906 and 2017YFD0501000), the Natural Science Foundation of Anhui Province (Grant no. 1808085MC75), Scientific research activities of postdoctoral researchers in Anhui (Grant no. 2017B194).
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Yu, HY., Liu, J., He, ZY. et al. Soluble Expression, Rapid Purification and Antiviral Activity of Recimbinant Bovine Interferon-α in Escherichia coli. Appl Biochem Microbiol 56, 154–163 (2020). https://doi.org/10.1134/S0003683820020143
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DOI: https://doi.org/10.1134/S0003683820020143