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Position: Home > Articles > Effect of MetX and DapA Gene Knockout on Threonine Biosynthesis in Corynebacterium glutamicum Biotechnology Bulletin 2011,0 (1) 158-164

谷氨酸棒杆菌metX、dapA基因敲除对苏氨酸合成的影响

作  者:
吕扬勇;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:
L-苏氨酸;蛋氨酸;赖氨酸;基因敲除;谷氨酸棒杆菌
摘  要:
谷氨酸棒杆菌中metX基因编码蛋氨酸合成途径关键酶高丝氨酸乙酰转移酶,dapA基因编码赖氨酸合成途径关键酶二氢吡啶二羧酸合成酶。为研究这两个基因缺失对苏氨酸积累的影响,以谷氨酸棒杆菌R102(AHVr)为出发菌株,通过重叠延伸PCR及同源重组技术分别构建了metX、dapA单基因缺失突变株R102ΔmetX、R102ΔdapA以及双基因缺失的突变株R102ΔmetXΔdapA。对出发菌以及上述3株重组菌进行初步摇瓶发酵试验,用HPLC法测定发酵液中苏氨酸含量。结果表明,发酵72 h后,3株重组菌的苏氨酸产量分别为2.58、2.38和3.01 g/L,比原始菌株分别提高了42.5%、31.5%和66.3%。
译  名:
Effect of MetX and DapA Gene Knockout on Threonine Biosynthesis in Corynebacterium glutamicum
作  者:
Lv Yangyong Wu Zhanhong Zheng Suiping(School of Bioscience and Bioengineering,South China University of Technology,Guangzhou 510006)
关键词:
L-threonine Methionine Lysine Gene knockout Corynebacterium glutamicum
摘  要:
metX and dapA gene play significant roles in methionine and lysine biosynthesis pathways respectively in Corynebacterium glutamicum.In order to study the effect of gene deletion on threonine accumulation,metX,dapA gene deficient mutants R102ΔmetX,R102ΔdapA and R102ΔmetXΔdapA were constructed from Corynebacterium glutamicum R102(AHVr) by SOE-PCR and homologous recombination.After 72 h fermentation,the threonine yield in broth of the three recombinant strains measured by HPLC were 2.58 g/L,2.38 g/L,3.01g/L,increasing by 42.5%,31.5% and 66.3%,respectively,comparing with that of the original strain R102.

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