Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (11): 5230-5237.doi: 10.11843/j.issn.0366-6964.2024.11.038

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Fusion Expression of African Swine Fever Virus p30 Protein and CRM197 and Evaluation of Its Immunogenicity in Mice

Qi ZHANG1,2(), Ningning DONG1, Xiaomei TAN2, Zhengwang SHI3, Na LI2, Wenqi ZHU1, Aoxing TANG2, Chuanfeng LI2, Jie ZHU2, Guangqing LIU2, Yan SU1,*(), Chunchun MENG1,2,*()   

  1. 1. Xinjiang Agricultural University, Urumqi 830052, China
    2. Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
    3. Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
  • Received:2024-01-02 Online:2024-11-23 Published:2024-11-30
  • Contact: Yan SU, Chunchun MENG E-mail:1658735668@qq.com;2006au@163.com;mengcc@shvri.ac.cn

Abstract:

African swine fever is an acute, highly contagious and deadly infectious disease caused by the African swine fever virus, which has had a huge impact on the pig breeding industry. The lack of vaccines and effective therapeutic drugs has brought great challenges to the prevention and control of African swine fever. We tried to design a fusion protein to improve the immunogenicity of African swine fever virus p30. CRM197, a non-virulent mutant of diphtheria toxin, has been successfully used as a carrier protein in polysaccharide-protein conjugate vaccines to enhance the immunogenicity of polysaccharides. In this study, a fusion expression plasmid of p30 and CRM197 catalytic domain (A fragment) was constructed, and the immunogenicity of the purified recombinant protein and p30 alone were evaluated using mice. After immunizing mice with the fusion protein p30-CRM197(A) purified by prokaryotic expression and affinity chromatography, p30 alone could excite a high level of specific IgG against p30 in a shorter period of time, and maintain a high level of lymphocyte immune activity two months after the initial epidemic. The results of this study showed that the A fragment of CRM197 alone could significantly enhance the immunogenicity of prokaryotic expression p30 protein as a protein carrier, and it could be used as a candidate intramolecular adjuvant for African swine fever subunit vaccine.

Key words: African swine fever, CRM197, p30, immunogenicity

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