Fermentation strategy to enhance plasmid stability during the cultivation of Escherichia coli for the production of recombinant levansucrase

Chul Ho Kim , Jang Young Lee , Min Gon Kim , Ki Bang Song , Jeong Woo Seo , Bong Hyun Chung , Soon Jae Chang , Sang Ki Rhee
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引用次数: 9

Abstract

To produce levansucrase, a fructosyltransferase enzyme, in a recombinant Escherichia coli harboring the levU gene of Zymomonas mobilis, fermentation strategies were examined in terms of induction methods and plasmid stability. Although the recombinant levansucrase was induced rapidly by IPTG, high instability of the plasmid and formation of inclusion bodies were observed. Segregational instability was aggravated by the excretion of β-lactamase into the culture broth during subculturing, which caused an overgrowth of plasmidfree cells. A combination of methicillin (2, 6-dimethoxyphenyl-penicillin) and ampicillin to provide selective pressure was effective in preventing the growth of plasmid-free cells. The population of plasmid-harboring cells was maintained above 95% of the total cells for more than 100 generations under this condition. In order to replace IPTG, which is toxic and too expensive for use in a large scale, d-lactose was tested and found to be favorable as an alternative inducer.

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提高重组左旋蔗糖酶在大肠杆菌培养过程中质粒稳定性的发酵策略
为了在含有运动单胞菌levU基因的重组大肠杆菌中产生果糖转移酶左旋蔗糖酶,从诱导方法和质粒稳定性方面考察了发酵策略。虽然IPTG可以快速诱导重组左旋蔗糖酶,但质粒的不稳定性和包涵体的形成存在较大问题。继代培养过程中β-内酰胺酶的分泌加剧了分离的不稳定性,导致无质粒细胞过度生长。甲氧西林(2,6 -二甲氧基苯基青霉素)和氨苄西林的组合提供选择压力,有效地阻止无质粒细胞的生长。在此条件下,100代以上携带质粒的细胞数量保持在细胞总数的95%以上。为了取代IPTG, d-乳糖是一种很好的替代诱导剂,因为IPTG是一种有毒且价格昂贵而不能大规模使用的诱导剂。
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