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共表达抗氧化酶促进脂肪氧合酶在大肠杆菌中的表达
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Enhanced Expression of Lipoxygenase inEscherichia coliby Co-Expressing Antioxidases
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DOI:10.3969/j.issn.1673-1689.2019.10.004
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中文关键词: 脂肪氧合酶 超氧化物歧化酶 过氧化氢酶 大肠杆菌 共表达 正交试验
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英文关键词: superoxide dismutase,catalase,lipoxygenase,Escherichia coli,co-expression,orthogonal test
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全文下载次数: 31
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中文摘要:
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基于脂肪氧合酶(LOX)活性对宿主菌潜在的危害,分别共表达了超氧化物歧化酶和过氧化氢酶,以期提高铜绿假单胞菌Pseudomonas aeruginosa BBE 来源的LOX在大肠杆菌Escherichia coliRosetta(DE3)中的表达。将P. aeruginosaBBE 超氧化物歧化酶基因sodB和sodM及E. coli过氧化氢酶基因katE克隆至 pRSFDuet-1,分别得到表达质粒pRSF-sodB,pRSF-sodM和pRSF-katE,将上述表达质粒转化至表达LOX的重组大肠杆菌N6,得到菌株N6-B,N6-M和N6-K。在20 ℃和1 mmol/mL异丙基-β-D-硫代半乳糖苷(IPTG)条件下诱导70 h,N6-B、N6-M和N6-K胞内外LOX总酶活分别为21.6、28.1和7.1 U/mL,其中N6-B和N6-M较对照菌株N6(11.8 U/mL)提高了83%和138%。通过正交实验确定LOX较优的诱导表达条件为:IPTG 浓度2 mmol/mL,诱导菌体浓度(OD600)2.5,诱导温度20 ℃。研究结果表明:共表达超氧化物歧化酶能有效促进LOX在大肠杆菌中的表达,为该酶高效异源表达研究提供了新思路。
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英文摘要:
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Based on the potential hazards of lipoxygenase(LOX) activity to host strain,three antioxidases(two superoxide dismutases and a catalase) are respectively co-expressed to improve the expression of lipoxygenase expression inEscherichia coliRosetta(DE3). The superoxide dismutase genes(sodBandsodM) fromP. aeruginosaBBE and catalase gene(katE) from E. coli are cloned into expression plasmid pRSFDuet-1,yielding the plasmids pRSF-sodB,pRSF-sodMand pRSF-katE. The recombinant plasmids are transformed into N6(a LOX expressing strain generated byE. coli) to obtain strains N6-B,N6-M and N6-K,respectively. Under the induction with 1 mmol/mL ITPG at 20 ℃,the total LOX activities of N6-B,N6-M and N6-K reach 21.6,28.1 and 7.1 U/mL respectively. The yield of LOX in N6-B and N6-M is increased by 83% and 138% in contrast to N6(11.8 U/mL),respectively. The optimized induction by using orthogonal test is as follow:OD600=2.5,IPTG=2 mmol/mL,and inducing temperature is 20 ℃. The results show that the co-expression of superoxide dismutases could effectively improve the expression of LOX inE. coli,which provides a new idea for efficient heterologous expression of this enzyme.
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