Enhancing survival of Escherichia coli by expression of azoreductase AZR possessing quinone reductase activity

  • Guangfei Liu
  • Jiti Zhou
  • Ruofei Jin
  • Mi Zhou
  • Jing WangEmail author
  • Hong Lu
  • Yuanyuan Qu
Biotechnologically Relevant Enzymes and Proteins


Quinone reductase activity of azoreductase AZR from Rhodobacter sphaeroides was reported. High homologies were found in the cofactor/substrate-binding regions of quinone reductases from different domains. 3D structure comparison revealed that AZR shared a common overall topology with mammal NAD(P)H/quinone oxidoreductase NQO1. With menadione as substrate, the optimal pH value and temperature were pH 8–9 and 50°C, respectively. Following the ping-pong kinetics, AZR transferred two electrons from NADPH to quinone substrate. It could reduce naphthoquinones and anthraquinones, such as menadione, lawsone, anthraquinone-2-sulfonate, and anthraquinone-2,6-disulfonate. However, no activity was detected with 1,4-benzoquinone. Dicoumarol competitively inhibited AZR’s quinone reductase activity with respect to NADPH, with an obtained Ki value of 87.6 μM. Significantly higher survival rates were obtained in Escherichia coli YB overexpressing AZR than in the control strain when treated by heat shock and oxidative stressors such as H2O2 and menadione.


Quinone reductase Azoreductase Oxidative stress Heat shock Survival 


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Guangfei Liu
    • 1
  • Jiti Zhou
    • 1
  • Ruofei Jin
    • 1
  • Mi Zhou
    • 1
  • Jing Wang
    • 1
    Email author
  • Hong Lu
    • 1
  • Yuanyuan Qu
    • 1
  1. 1.School of Environmental and Biological Science and TechnologyDalian University of TechnologyDalianPeople’s Republic of China

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