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投稿时间:2022-07-17
投稿时间:2022-07-17
中文摘要: 对谷氨酸棒杆菌(Corynebacterium glutamicum,C.glutamicum)表达大肠杆菌(Escherichia coli,E.coli)来源海藻糖酶进行研究。构建重组C.glutamicum菌株Cgtrl表达E.coli BL21来源海藻糖酶。菌株Cgtrl海藻糖酶最适表达条件:诱导剂异丙基-β-D-硫代半乳糖苷(isopropyl-β-D-thiogalactopyranoside,IPTG)添加量为0.5 mmol/L,诱导温度为22℃,诱导时间为12 h。在最适表达条件下重组海藻糖酶酶活为9.1 U/mL。重组海藻糖酶酶学性质研究表明,未经纯化的重组海藻糖酶具有较好的底物特异性能,专一性水解海藻糖,海藻糖水解率在96%以上,低温条件下稳定性较好,能够长时间低温保存,最适作用温度为45℃,最适作用pH值为6.6。
Abstract:The expression of trehalase from Escherichia coli BL21 by the constructed recombinant Corynebacterium glutamicum was studied.The optimal conditions for trehalase expression by Cgtrl were 0.5 mmol/L of isopropyl-β-D-thiogalactopyranoside as the inducer,induction temperature of 22 ℃,and induction time of 12 h.The recombinant trehalase activity reached 9.1 U/mL under the optimal expression conditions.Unpurified recombinant trehalase specifically hydrolyzed trehalose.The hydrolysis ratio of trehalose exceeded 96%.The recombinant trehalase was stable and could maintain enzyme activity for a long period at low temperature.The enzyme activity was optimal at 45℃and pH 6.6.
keywords: Corynebacterium glutamicum Escherichia coli trehalase optimization of expression conditions enzymatic properties
文章编号:202224025 中图分类号: 文献标志码:
基金项目:国家自然科学基金青年科学基金项目(31700075);山东省重大科技创新工程项目(2019JZZY020605)
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