生物技术通报 ›› 2014, Vol. 0 ›› Issue (4): 164-168.

• 研究报告 • 上一篇    下一篇

基于重组大肠杆菌无细胞体系生产吡咯喹啉醌

孙继国1, 韩增叶1, 葛喜珍2, 田平芳1   

  1. (1.北京化工大学生命科学与技术学院,北京 100029;
    2.北京联合大学生物化学工程学院,北京 100023)
  • 收稿日期:2013-11-25 出版日期:2014-04-29 发布日期:2014-04-29
  • 作者简介:孙继国,男,硕士研究生,研究方向:微生物代谢工程;E-mail:mishiweilan@126.com
  • 基金资助:
    国家自然科学基金项目(21076013),“973”项目(2012CB725200)

Exploiting Cell-free System of Recombinant E. coli to Synthesize Pyrroloquinoline Quinone

Sun Jiguo1, Han Zengye1, Ge Xizhen2, Tian Pingfang1,   

  1. (1. College of Life Science and Technology,Beijing University of Chemical Technology,Beijing 100029;
    2. College of Biochemical Engineering,Beijing Union University,Beijing 100023)
  • Received:2013-11-25 Published:2014-04-29 Online:2014-04-29

摘要: 采用无细胞体系生产吡咯喹啉醌(pyrroloquinoline quinone,PQQ)。首先将肺炎克雷伯氏菌PQQ基因簇pqqABC-DEF置于半乳糖苷酶启动子之下,构建表达载体,经转化筛选获得重组大肠杆菌。制备重组菌的细胞匀浆,体外反应后测定PQQ产量。结果显示,与活体重组菌相比,无细胞体系的PQQ产量提高约30%,表明胞内存在PQQ合成的限速反应,而无细胞体系可解除此限速反应。

关键词: 大肠杆菌, 无细胞体系, 吡咯喹啉醌, 限速反应

Abstract: In this study, cell-free system was developed to overproduce pyrroloquinoline quinone(PQQ). The PQQ gene cluster from Klebsiella pneumoniae was subcloned into vector harboring lac promoter and a recombinant Escherichia coli was acquired. Subsequently cell homogenate was prepared which showed ~30% increase of PQQ yield compared with in vivo biosynthesis. Not only revealing the presence of intracellular velocity-limiting reaction(s)that retards PQQ biosynthesis, this study also suggests that cell-free system can address this issue. Hence, this study provides basis for further enhancement of PQQ production.

Key words: E. coli, Cell-free system, Pyrroloquinoline quinine, Velocity-limiting reaction