SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 234-240.DOI: 10.1016/j.cjche.2014.10.018

• 生物技术与生物工程 • 上一篇    下一篇

Characterization of promoters in Escherichia coli and application for xylitol synthesis

Cuiwei Wang1,2, Zhe Li1, Aamir Rasool1, Hongnan Qu1, Dazhang Dai1, Chun Li1,2   

  1. 1 School of Life Science, Beijing Institute of Technology, Beijing 100081, China;
    2 School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
  • 收稿日期:2014-06-20 修回日期:2014-09-16 出版日期:2015-01-28 发布日期:2015-01-24
  • 通讯作者: Cuiwei Wang
  • 基金资助:

    Supported by the National High Technology Research and Development Program of China (863 Program) (2012AA02A704), the Major State Basic Research Development Program of China (973 Program) (2013CB733900), the National Natural Science Foundation of China (21176028, 21376028) and the National Research Foundation for the Doctoral Program of Higher Education of China (20121101110050).

Characterization of promoters in Escherichia coli and application for xylitol synthesis

Cuiwei Wang1,2, Zhe Li1, Aamir Rasool1, Hongnan Qu1, Dazhang Dai1, Chun Li1,2   

  1. 1 School of Life Science, Beijing Institute of Technology, Beijing 100081, China;
    2 School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
  • Received:2014-06-20 Revised:2014-09-16 Online:2015-01-28 Published:2015-01-24
  • Contact: Cuiwei Wang
  • Supported by:

    Supported by the National High Technology Research and Development Program of China (863 Program) (2012AA02A704), the Major State Basic Research Development Program of China (973 Program) (2013CB733900), the National Natural Science Foundation of China (21176028, 21376028) and the National Research Foundation for the Doctoral Program of Higher Education of China (20121101110050).

摘要: Promoters are themost important tools to control and regulate the gene expression in synthetic biology and metabolic engineering. The expression of target genes in Escherichia coli is usually controlled by the high-strength inducible promoter with the result that the abnormally high transcription of these genes creates excessive metabolic load on the host, which decreases product formation. The constitutive expression systems are capable of avoiding these defects. In this study, to enrich the application of constitutive promoters in metabolic engineering, four promoters from the glycolytic pathway of E. coli were cloned and characterized using the enhanced green fluorescent protein as reporter. Among these promoters, PgapA was determined as the strongest one, the strength of which was about 8.92% of that of the widely used inducible promoter PT7. This promoter was used to control the expression of heterologous xylose reductase in E. coli for xylitol synthesis so as to verify its function in pathway engineering. Themaximumxylitol titer (40.6 g·L-1) produced by engineered E. coli under the control of the constitutive promoter PgapA was obviously higher than that under the control of the inducible promoter PT7, indicating the feasibility and superiority of promoter PgapA in the metabolic engineering of E. coli.

关键词: Escherichia coli, Promoter, Characterization, Xylose reductase, Xylitol

Abstract: Promoters are themost important tools to control and regulate the gene expression in synthetic biology and metabolic engineering. The expression of target genes in Escherichia coli is usually controlled by the high-strength inducible promoter with the result that the abnormally high transcription of these genes creates excessive metabolic load on the host, which decreases product formation. The constitutive expression systems are capable of avoiding these defects. In this study, to enrich the application of constitutive promoters in metabolic engineering, four promoters from the glycolytic pathway of E. coli were cloned and characterized using the enhanced green fluorescent protein as reporter. Among these promoters, PgapA was determined as the strongest one, the strength of which was about 8.92% of that of the widely used inducible promoter PT7. This promoter was used to control the expression of heterologous xylose reductase in E. coli for xylitol synthesis so as to verify its function in pathway engineering. Themaximumxylitol titer (40.6 g·L-1) produced by engineered E. coli under the control of the constitutive promoter PgapA was obviously higher than that under the control of the inducible promoter PT7, indicating the feasibility and superiority of promoter PgapA in the metabolic engineering of E. coli.

Key words: Escherichia coli, Promoter, Characterization, Xylose reductase, Xylitol