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谷氨酰胺酶基因的克隆、表达和酶学性质研究 被引量:3

Cloning,Expression and Characterization of Bacillus Subtilis Glutaminase
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摘要 以枯草芽孢杆菌基因组为模板通过PCR扩增获得谷氨酰胺酶基因ylaM,构建重组质粒pMA5-ylaM,将其转化到枯草芽孢杆菌168中获得重组菌BS168/pMA5-ylaM,并在宿主菌成功得到表达,纯化后的谷氨酰胺酶比酶活大小为939.48 U/mg。谷氨酰胺酶的反应最适pH为7.5,反应最适温度为55℃,La^3+、Zn^2+、Fe^3+和Al^3+对谷氨酰胺酶活力具有一定的抑制作用,在NaCl浓度为15%~17.5%的条件下,该酶酶活力可以保留50%以上。在5 L罐中,通过分批补料发酵,其最高酶活力产量为215.06 U/mL。 The glutaminase gene(ylaM)was amplified from Bacillus subtilis by PCR.Construction of pMA5-ylaM and expressed in Bacillus subtilis 168.The specific activity of purified glutaminase was 939.48 U/mg.The optimization activity of recombinant enzyme was at pH 7.5 and 55℃.La^3+、Zn^2+、Fe^3+and Al3+inhibited the glutaminase activity.More than 50%of the maximum activity was retained in the presence of 15%~17.5%NaCl.The highest production of glutaminase of fed-batch fermentation was 215.06 U/mL in the 5 L fermentation.
作者 张美丹 饶志明 张显 杨套伟 徐美娟 ZHANG Meidan;RAO Zhiming;ZHANG Xian;YANG Taowei;XU Meijuan(The Key Laboratory of Industrial Biotechnology,Ministry of Education,School of Biotechnology,Jiangnan University,Wuxi 214122,China)
出处 《食品与生物技术学报》 CAS CSCD 北大核心 2019年第10期60-66,共7页 Journal of Food Science and Biotechnology
基金 国家863计划项目(2015AA021004) 国家自然科学基金项目(21276110,31500065,31400082) 江苏省青年自然科学基金项目(BK20150142) 中国博士后科学基金资助项目(2015M570407,2016T90421) 江苏高校优势学科建设工程资助项目
关键词 枯草芽孢杆菌 谷氨酰胺酶 酶学性质 Bacillus subtilis glutaminase enzymatic properties
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