China Animal Husbandry and Veterinary Medicine ›› 2020, Vol. 47 ›› Issue (8): 2660-2665.doi: 10.16431/j.cnki.1671-7236.2020.08.036

• Basic Veterinary Medicine • Previous Articles     Next Articles

Prokaryotic Expression and Purification of Cap Protein of Xinjiang Porcine Circovirus Type 3 Strain

GU Siying1, QU Yonggang1, WEI Qi1, WU Yuanyuan1, YU Huiju1, LI Yan2   

  1. 1. College of Animal Science and Technology, Shihezi Univerisity, Shihezi 832003, China;
    2. The General Station of Animal Husbandry and Veterinary Medicine of Xinjiang Production and Construction Corps, Urumqi 830063, China
  • Received:2020-02-23 Online:2020-08-20 Published:2020-08-15

Abstract: The purpose of this study was to prepare porcine circovirus type 3 (PCV3) capsid protein by construct a prokaryotic expression vector pGEX-4T-1-Cap.Recombinant plasmid pGEX-4T-1-Cap was constructed by inserting codon optimized PCV3 Cap gene into pGEX-4T-1 vector,and then transformed into Escherichia coli BL21 (DE3) competent cell.The optimal induction conditions were screened out,and the recombinant Cap protein was purified by glutathione agarose resin.The results showed that the recombinant plasmid pGEX-4T-1-Cap was successfully constructed.A large amount of soluble recombinant capsid protein could be obtained under the condition that the final concentration of IPTG was 0.1 mmol/L and induced at 16 ℃ for 20 h.SDS-PAGE results showed that the molecular mass of the recombinant capsid protein was 51.6 ku with the same size as expected.Western blotting analysis showed that the purified Cap protein reacted positively with mouse anti-GST monoclonal antibody and PCV3 rabbit-derived positive serum,further confirming the expression of the recombinant protein.Therefore,the recombinant protein PCV3 Cap expressed and purified in this study,it laid a foundation for the development of new gene engineering subunit vaccine and the establishment of ELISA method.

Key words: porcine circovirus type 3(PCV3); capsid protein; prokaryotic expression; protein purification

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