›› 2012, Vol. 39 ›› Issue (12): 10-13.

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Cloning and Expression of α Toxin Gene from Toxin Type D Clostridium perfringens

LI Na1, WU Jian-yong2, LI Jian-jun2, YANG Xue-yun2, WANG Deng-feng2, DUAN Xin-hua2, WANG Zhi-cai2   

  1. 1. College of Animal Science & Technology,Shihezi University,Shihezi 832003,China;
    2. Institute of Veterinary Medicines,Xinjiang Academy of Animal Science,Urumqi 830000,China
  • Received:2012-06-12 Online:2012-12-20 Published:2012-12-19

Abstract: To establish the method for cloning and expression of Clostridium perfringens α toxin gene(cpa),the cpa gene was amplified by PCR from toxin type D strain,then was inserted into pET-28b to construct pET-28b-cpa.Identified by PCR,restriction enzyme digestion and sequencing methods,the recombinant plasmid was transformed into BL21 (DE3) pLysS and induced to express by IPTG. The size and distribution of the target protein were detected by SDS-PAGE,and its reactionogenicity was confirmed by Western blotting.The results showed that the cpa gene was 1110 bp and the homology with reference sequence of GenBank was greater than 99%.In SDS-PAGE analysis,the target protein was 41.2 ku as expected and distributed in ultrasonic lysis supernatant as well as in inclusion bodies,but mainly existed in inclusion bodies. Both of them showed similar reactionogenicity to native α toxin.

Key words: Clostridium perfringens; α toxin; cloning; expression

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