过量表达异柠檬酸裂解酶对ldh^(-1)谷氨酸棒状杆菌产丁二酸的影响  

Effect of overexpressing isocitrate lyase on succinate production in ldh^(-1) Corynebacterium glutamicum

作　　者：杨超[1] 郝宁[1] 严明[1] 高璐[1] 许琳[1] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京210009

出　　处：《生物工程学报》2013年第11期1696-1700,共5页Chinese Journal of Biotechnology

基　　金：江苏省高校自然科学研究面上项目(No.13KJB530008);国家重点基础研究发展计划(973计划)(No.2011CBA00807)资助~~

摘　　要：谷氨酸棒状杆菌SA001是缺失了乳酸脱氢酶基因(ldhA)的菌株。为了增加厌氧条件下经异柠檬酸到丁二酸的代谢通量,以提高丁二酸的产量。将来自大肠杆菌Escherichia coli K12的异柠檬酸裂解酶基因导入谷氨酸棒状杆菌SA001(SA001/pXMJ19-aceA)中。该菌经0.8 mmol/L的IPTG有氧诱导12 h后,转入厌氧发酵16 h,丁二酸的产量为10.38 g/L,丁二酸的生产强度为0.83 g/(L·h)。与出发菌株比较,异柠檬酸裂解酶的酶活提高了5.8倍,丁二酸的产量提高了48%。结果表明过量表达异柠檬酸裂解酶可以增加由乙醛酸途径流向丁二酸的代谢流。Corynebacterium glutamicum SA001 is a mutant with lactate dehydrogenase （ldhA） deletion. In order to increase metabolic flux from isocitrate to succinate, and to improve the production of succinate under anaerobic conditions,we transducted the gene aceA coding isocitrate lyase （ICL） from Escherichia coli K12 into Corynebacterium glutamicum SA001 （SAOO1/pXMJ19-aceA）. After 12 h aerobic induction by adding 0.8 mmol/L of IPTG, the recombinant strain was transferred to anaerobic fermentation for 16 h. Succinate reached 14.84 g/L, with a productivity of 0.83 g/（L-h）. Compared to C. glutamicum SA001, the activity of ICL of the recombinant strain was increased 5.8-fold, and the succinate productivity was increased 48%. Overexpression of isocitrate lyase will increase the metabolic flux of glyoxylate bypass flowing to succinate.

关 键 词：异柠檬酸裂解酶 谷氨酸棒状杆菌 丁二酸 

分 类 号：TQ921[轻工技术与工程—发酵工程]