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Wang A, Yin J, Zhou J, Ma H, Chen Y, Liu H, Qi Y, Liang C, Liu Y, Li J, Zhang G. Soluble expression and purification of Bluetongue Virus Type 1 (BTV1) structure protein VP2 in Escherichia coli and its immunogenicity in mice. PeerJ 2021; 9:e10543. [PMID: 33505791 PMCID: PMC7789859 DOI: 10.7717/peerj.10543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 11/20/2020] [Indexed: 12/05/2022] Open
Abstract
Background The VP2 on the surface of the virus particle is the main structural protein of BTV, which can induce the host to produce neutralizing antibodies and play an important role in the antiviral immunity process. This study aimed to obtain the soluble VP2 and analyze its immunogenicity. Methods The gene encoding the full-length VP2 of BTV1 was amplified by PCR. The products from restriction enzyme digestion and ligase reaction between VP2 and vector pET-28a were transformed into E.coli DH5α. After PCR and sequencing detection, the positive plasmid PET28a-VP2 was transformed into E.coli BL21(DE3) and Rosetta(DE3) competent cells, expression induced by IPTG. The fusion protein was expressed in the optimized conditions with the induction of IPTG, purified by affinity chromatography and identified by SDS-PAGE and Western blotting. A total of 5 Balb/c mice aged 6–8 weeks were immunized with the fusion protein at a dose of 30 µg per mouse. Each mouse was immunized three times at an interval of 3 weeks. Results The recombinant plasmid PET28a-VP2 was successfully constructed. The expression strains were induced by 0.4 mmol/L IPTG at 16 °C for 10 h, and BTV1 VP2 was expressed in a soluble form. The purity of the recombinant VP2 protein (∼109 kDa) was about 90% in the concentration at 0.2 mg/ml afterpurification. The purified VP2 had good immunoreactivity with BTV1 positive serum. Taken together, thisstudy offered a route for producing soluble BTV VP2, which retains activity and immunogenicity, to bebeneficial to the research on developing BTV vaccine, and lay the foundation for further research on BTV.
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Affiliation(s)
- Aiping Wang
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Jiajia Yin
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Jingming Zhou
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Hongfang Ma
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Yumei Chen
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Hongliang Liu
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Yanhua Qi
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Chao Liang
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Yankai Liu
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Jinge Li
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
| | - Gaiping Zhang
- Zhengzhou University, School of Life Sciences, Zhengzhou University, Henan, PR China
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