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Position: Home > Articles > Effect of different inducers and culture conditions on the expression of β_2-toxin gene from Clostridium perfringens Type C Acta Agriculturae Zhejiangensis 2015,34 (10) 1822-1827

不同诱导剂及培养条件对C型产气荚膜梭菌β_2毒素基因表达的影响

作  者:
许崇利
单  位:
吉林化工学院生物与食品工程学院
关键词:
C型产气荚膜梭菌;β2毒素;IPTG;乳糖
摘  要:
对产气荚膜梭菌(Clostridium perfringens)β2毒素基因的表达载体p ETXB2进行限制性核酸内切酶酶切鉴定,并用SDS-PAGE检测了不同培养条件下,该毒素基因在埃希氏大肠杆菌(Escherichia coli)BL21(DE3)工程菌株中的表达情况。结果表明,p ETXB2重组质粒中的β2毒素基因位于p ET-28c(+)表达盒中,且阅读框架和基因序列正确。以IPTG为诱导剂时,重组菌株BL21(DE3)(p ETXB2)的最佳培养条件为37℃,p H7.0,IPTG终浓度0.8 mmol·L-1,诱导4 h;以乳糖为诱导剂时,其最佳培养条件为37℃,p H 7.0,乳糖终浓度0.5 g·L-1,诱导5 h。
译  名:
Effect of different inducers and culture conditions on the expression of β_2-toxin gene from Clostridium perfringens Type C
作  者:
XU Chong-li;College of Biology and Food Engineering,Jilin Institute of Chemical Technology;
关键词:
Clostridium perfringene type C;;β2-toxin;;IPTG;;lactose
摘  要:
Recombinant plasmid p ETXB2 which contained Clostridium perfringens β2-toxin gene was identified with restriction endonucleases digestion,and the gene's expression products in Escherichia coli strain BL21( DE3) under different culture conditions were detected by SDS-PAGE. The results were as follows: Endonucleases digestion and DNA sequencing confirmed that the recombinant expression plasmid p ETXB2 contained the β2-toxin gene in the expression cassette of p ET-28c( +) with a positive reading frame. The optimization condition of inducible expression for β2-toxin by IPTG was 0. 8 mmol·L- 1of IPTG concentration and inducing for 4 h at 37℃,p H 7. 0. When induced by lactose,the optimization condition was 0. 5 g·L- 1of lactose concentration and inducing for 5 h at 37℃,p H 7. 0.

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