食品科学 ›› 2010, Vol. 31 ›› Issue (23): 262-266.doi: 10.7506/spkx1002-6630-201023058

• 生物工程 • 上一篇    下一篇

一株黄色短杆菌基因工程菌株的构建及其L- 缬氨酸积累

徐大庆1,2,谭延振1,缪 铭1,王小元1,*   

  1. 1.江南大学 食品科学与技术国家重点实验室
    2. 河北农业大学生命科学学院
  • 收稿日期:2010-04-16 修回日期:2010-11-22 出版日期:2010-12-15 发布日期:2010-12-29
  • 通讯作者: 王小元 E-mail:xiaoyuanwang@hotmail.com
  • 基金资助:

    国家“863”计划项目(2007AA02Z229;2007AA02Z230)

Construction and L-valine Accumulation of a Genetic Engineering Brevibacterium flavum Strain

XU Da-qing1,2, TAN Yan-zhen1, MIAO Ming1, WANG Xiao-yuan1,*   

  1. 1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China;
    2. College of Life Sciences, Agricultural University of Hebei, Baoding 071001, China
  • Received:2010-04-16 Revised:2010-11-22 Online:2010-12-15 Published:2010-12-29
  • Contact: WANG Xiao-yuan1 E-mail:xiaoyuanwang@hotmail.com

摘要:

从谷氨酸棒杆菌模式菌株C. glutamicum ATCC13032 中克隆出L- 缬氨酸合成途径上的限速酶——乙酰羟酸合酶编码基因ilvBN。对ilvBN 进行定点突变,获得其抗反馈抑制突变型ilvBNr。以大肠杆菌- 黄色短杆菌穿梭表达载体pDXW-10 为基础,构建重组质粒pDXW-10-ilvBNr,并转化野生型黄色短杆菌B. flavum ATCC14067,获得工程菌株ATCC14067/pDXW-10-ilvBNr。3L 罐发酵实验结果显示:在野生型菌株发酵液中检测不到L- 缬氨酸积累,而工程菌株发酵液中L- 缬氨酸积累达5.0g/L。

关键词: 乙酰羟酸合酶, 抗反馈抑制, 黄色短杆菌, 发酵, L - 缬氨酸

Abstract:

As a rate-limiting enzyme for L-valine biosynthesis, the ilvBN gene encoding acetyl-carboxylic acid synthase (AHAS) from Corynebacterium glutamicum ATCC13032 was amplified by PCR, followed by site-direct mutagenesis to obtain an ilvBNr gene, the anti-feedback inhibition gene of ilvBN. The ilvBNr gene inserted into E. coli-Brevibacterium flavum shuttle expression vector pDXW-10 to construct a recombinant plasmid pDXW-10-ilvBNr, which was subsequently transformed into B. flavum ATCC14067, producing a genetic engineering strain ATCC14067/pDXW-10-ilvBNr. The fermentation experiments conducted in a 3 L fermentor showed that no L-valine accumulation was detected in the fermentation broth of the original strain, while an L-valine accumulation of 5.0 g/L was observed in the fermentation broth of the constructed engineering strain.

Key words: acetyl-carboxylic acid synthase, anti-feedback inhibition, Brevibacterium flavum, fermentation, L-valine

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