摘要
目的对霍乱弧菌zot毒力基因进行表达并研究重组蛋白的生物活性。方法从霍乱弧菌(Vibrio cholerae)MO45中克隆zot的全基因序列,构建其原核表达质粒pET-32a(+)-zot并转化至大肠杆菌E.coli BL21(DE3)中,通过诱导表达和亲和层析纯化重组蛋白,研究zot表达蛋白对人小肠上皮细胞的凋亡作用。结果纯化蛋白的浓度为0.324mg/mL,经Western blot验证表达蛋白为目的蛋白,用流式细胞仪检测经表达蛋白作用的人小肠上皮细胞显示重组zot蛋白能引起人小肠上皮细胞的早期凋亡。结论成功克隆表达了霍乱弧菌毒力基因zot,重组蛋白能引起人小肠上皮细胞的早期凋亡。
The aim of this study is to construct the expression vector of zot gene of Vibrio cholerae and to realize the expression of zot gene of Vibrio cholerae in E.coli and study the biological activity of its recombinant expression product.In order to express zot protein in E.coli,the full-length open reading frame of zot was amplified by PCR from the standard strains of Vibrio cholerae MO45 genome DNA.The PCR product was cloned into prokaryotic expression vector pET-32 a(+)with restriction enaymes BamH I and XhoI.The recombinant vector pET-32 a(+)-zot was transformed into E.coli BL21(DE3)and expressed by IPTG induction.The zot fusion protein was detected by SDS-PAGE and Western blotting and purified by Ni-NTA affinity chromatography.After expression and purification,the recombinant expression protein played as a target for human small intestinal epithelial cells.Restriction endonuclease digestion,PCR and DNA sequencing analysis showed that the zot gene of 1 200 bp was amplified fromVibrio cholerae DNA,and the recombinant plasmid pET-32 a(+)-zot was constructed and detected its expression in prokaryotic cell successfully with SDS-PAGE and Western blot techniques.The zot recombinant protein was successfully expressed and purified.The purified zot recombinant protein can cause human intestinal epithelial cells apoptosis.
出处
《中国人兽共患病学报》
CAS
CSCD
北大核心
2017年第11期996-1001,共6页
Chinese Journal of Zoonoses
基金
江西省科技厅项目基金(No.20151BBG70106)~~
关键词
霍乱弧菌
克隆表达
zot基因
人小肠上皮细胞
Vibrio cholerae
zot gene
cloning and expression
human intestinal epithelial cell
