›› 2018, Vol. 45 ›› Issue (11): 3237-3245.doi: 10.16431/j.cnki.1671-7236.2018.11.031

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Three Copies Recombinant Expression and Immunogenicity Analysis of C-terminal of Clostridium perfringens α Toxin

DU Jige, LIU Ying, ZHU Zhen, XUE Qi, ZHANG Xiukun, LI Qihong, YIN Chunsheng, KANG Kai, YAO Wensheng, CHEN Xiaoyun   

  1. China Institute of Veterinary Drug Control, Beijing 100081, China
  • Received:2018-02-02 Online:2018-11-20 Published:2018-11-20

Abstract:

This study was aimed to obtain a tandem fusion protein of three copies of CPA C-terminal (CPAC),and evaluate its immunogenicity.Based on the known CPA sequence of Clostridium perfringens type A(GenBank accession No.:AY823400.1),CPAC gene was optimized,three copies of CPAC genes (GCPAC3) were tandemly linked in the same direction with the flexible amino acid linker (GGGS) gene and synthesized.In roder to get the recombinant protein of three copies of CPAC(rGCPAC3),GCPAC3 was cloned into prokaryotic expression vector pET-30a(+) for expression and purification.Reactivity of rGCPAC3 with antiserum of Clostridium perfringens type A was detected by Western blotting.Four rabbits were immunized with rGCPAC3 emulsified with oil adjuvant of ISA 201 to prepare antiserum and detect the neutralizing titer.The results showed that rGCPAC3was presented predominantly in an insoluble form (inclusion bodies),and it could react with the antiserum of Clostridium perfringens type A.After the first immunization,sera from rabbits immunized with rGCPAC3could neutralize 30 to 50 MLD/mL Clostridium perfringens type A toxin,and 70 to 100 MLD/mL after twice immunization.Moreover,rabbits in rGCPAC3immunized group fully survived at the dose of 1 rabbit MLD of Clostridium perfringens type A toxin challenge,whereas all of the rabbits died (100%,4/4) in control groups.These data suggested that rGCPAC3was a potential vaccine candidate for genetic engineering subunit vaccine of Clostridium perfringens type A.

Key words: Clostridium perfringens α toxin; C-terminal; recombinant expression; antigenicity

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