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谷氨酸棒杆菌aroⅡ、trpEGD基因的过量表达及其对色氨酸合成的影响

作  者:
李智涛;伍展红;郑穗平
单  位:
华南理工大学生物科学与工程学院
关键词:
谷氨酸棒杆菌;L-色氨酸;关键酶;过量表达;串联表达
摘  要:
以谷氨酸棒杆菌SPT9(Phe-、Tyr-、4-FPr、6-FTr)为出发菌株,采用PCR方法扩增色氨酸合成途径中解除了反馈抑制的关键酶aroⅡ和trpEGD基因,应用大肠杆菌-谷氨酸棒杆菌穿梭表达载体pEC-XK99E在谷氨酸棒杆菌SPT9中对其进行了分别过量表达和串联过量表达。首先对aroⅡ和trpEGD基因分别进行过量表达,得到菌株SPT9-aroⅡ、SPT9-trpEGD,摇瓶发酵试验表明,菌株SPT9-aroⅡ、SPT9-trpEGD的色氨酸产量相对于出发菌株SPT9分别提高了30%、23%;进一步对aroⅡ和trpEGD进行了串联过量表达,得到菌株SPT9-trpEGD-TP-aroⅡ,摇瓶发酵试验表明,该菌株色氨酸产量相对于出发菌株SPT9提高了84%。荧光定量PCR检测表明,菌株SPT9-trpEGD-TP-aroⅡ中aroⅡ、trpEGD基因的表达量分别为出发菌株SPT9的4.0倍和1.3倍。
译  名:
Over-expression of aroⅡand trpEGD Genes in Corynebacterium glutamicum and Their Effects on Tryptophan Yield
作  者:
Li Zhitao Wu Zhanhong Zheng Suiping(School of Bioscience and Technology,South China University of Technology,Guangzhou 510006)
关键词:
Corynebacterium glutamicum L-tryptophan Key enzymes Over-expression Co-expression
摘  要:
The host strain in this paper was C.glutamicum SPT9(Phe-,Tyr-,4-FPr,6-FTr).In order to improve bio-production of tryptophan,feedback inhibition resistant aroⅡand trpEGD genes were cloned by PCR and over-expressed in C.glutamicum SPT9 respectively using Escherichia coli-C.glutamicum shuttle expression vector pEC-XK99E.Over-expressions were effective,and the amounts of tryptophan biosynthesis in the resulted strains SPT9-aroⅡ,SPT9-trpEGD were increased by 30% and 23% respectively,compared with that of the host strains SPT9.Then,aroⅡ and trpEGD genes were co-expressed using the same shuttle expression vector pEC-XK99E,and the amount of tryptophan biosynthesis in the resulted strain SPT9-trpEGD-TP-aroⅡ was increased by 84% compared with that of the host strains SPT9.Fluorescence quantitative PCR showed that the relative expressions of aroⅡ and trpEGD genes in strain SPT9-trpEGD-TP-aroⅡ were increased to 4.0 folds and 1.3 folds,respectively.

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