Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (11): 2794-2801.doi: 10.11843/j.issn.0366-6964.2020.11.018

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Expression and Protective Efficacy of Clostridium perfringens β toxin Derivative

DU Jige1, ZHU Zhen1, XU Zhongqing1, LI Qianlin1, YAO Wensheng1, LI Qihong1, YIN Chunsheng1, YANG Liu2, FU Lizhi2, CHEN Xiaoyun1, LIU Ying1*, XUE Qi1*   

  1. 1. China Institute of Veterinary Drug Control, Beijing 100081, China;
    2. Chongqing Academy of Animal Sciences, Chongqing 402460, China
  • Received:2020-04-10 Online:2020-11-25 Published:2020-11-20

Abstract: This study was conducted to obtain the Clostridium perfringens β toxin (CPB) derivative and to evaluate its virulence and immunoprotection. Based on the known sequence, four amino acid mutations, R212E, L268G, Y266A and W275A, were introduced into the gene of Clostridium perfringens CPB. Meanwhile, genes of Th cell and N-terminal of flagellin were added to 5' of the CPB gene, respectively. Then the gene GTFNCPBm4 was optimized and synthesized, and was subsequently cloned into the prokaryotic expression vector pET-30a (+) for expression and purification to get the recombinant protein, rTFNCPBm4. Reactivity of rTFNCPBm4with antiserum of Clostridium perfringens type C crude toxins was detected by Western blot. Meanwhile, the toxicity of rTFNCPBm4 to mice was evaluated. According to the method prescribed in Chinese Veterinary Pharmacopoeia (2015), rabbits were immunized with rTFNCPBm4 to prepare antiserum and detect the neutralizing titer against Clostridium perfringens type C crude toxins. Results showed that rTFNCPBm4 was presented predominantly in an insoluble form (inclusion bodies), and it could react with the antiserum of Clostridium perfringens type C crude toxins. rTFNCPBm4 with an injection volume of 50 μg was still not fatal to mice. Sera from rabbits immunized with rTFNCPBm4can neutralize 10-20 mouse minimum lethal doses (MLD) of Clostridium perfringens type C crude toxins after twice immunization. Moreover, rabbits immunized with rTFNCPBm4 can fully resist 1 rabbit MLD of Clostridium perfringens type C crude toxins challenge, whereas all of the rabbits died (4/4) in the control groups. These data suggest that rTFNCPBm4 is a potential vaccine candidate for the subunit vaccine of Clostridium perfringens type C.

Key words: Clostridium perfringens CPB, mutation, Th cell epitope, flagellin, virulence, immunoprotection

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