Cloning and expression of a bactericin sakacin P from Lactobacillus sakei in Escherichia coli
首发时间:2008-10-15
Abstract:Sakacin P, a novel bactericin from Lactobacillus sakei, is a potential antimicrobial substrate, which has strong activity against food-borne pathogen eg. Listeria monocytogenes. In Lactobacillus sakei, the gene (sppA) of sakacin P was controled by strict regulation mechnism, so that the quantity of secreted sakacin P was low. In this study, we synthesized the sppA gene using splicing by overlap extension PCR (SOE-PCR), and cloned it into E. coli expression system. After the induction of IPTG, the recombinant sakacin P was successfully expressed. The collected cells were sonicated and the activity was identified by inhibition zone method using the cell-free supernatant. The results also showed that the low temperature introduction took more active sakacin P which has strong antimicrobial activity.
keywords: sakacin P expression class IIa bacteriocins
点击查看论文中文信息
沙克乳杆菌细菌素sakacin P在大肠杆菌中的克隆表达
摘要:细菌素sakacin P是一种非常有应用前景的防腐剂。它由沙克乳杆菌(Lactobacillus sakei)产生,对食品腐败菌,尤其是对单核细胞增生李斯特氏菌有很强的抑菌活性。编码细菌素sakacin P的基因(sppA)在沙克乳杆菌中受到严格的调控,因此由该菌分泌表达的细菌素sakacin P的产量很低且产物难于分离纯化。本实验采用重叠延伸PCR法(SOE-PCR)人工合成了sakacin P的结构基因,将该序列克隆入大肠杆菌并经异丙基-β-D-硫代半乳糖苷(IPTG) 成功诱导表达后,随即将细胞进行超声波破碎并离心,得到细胞上清液及沉淀物,最后用抑菌圈法测得细胞上清液具有显著的抑制单核细胞增生李斯特氏菌活性,同时结果还表明低温诱导有利于产生高活性的sakacin P细菌素。
论文图表:
引用
No.2482733071612240****
同行评议
共计0人参与
勘误表
沙克乳杆菌细菌素sakacin P在大肠杆菌中的克隆表达
评论
全部评论0/1000