Scavenging Reactive Oxygen Species by Rice Dehydroascorbate Reductase Alleviates Oxidative Stresses in Escherichia coli

  • Shin, Sun-Young (Department of Biology, Kyungpook National University) ;
  • Kim, Il-Sup (Department of Biology, Kyungpook National University) ;
  • Kim, Yul-Ho (National Institute of Crop Science, Rural Development Administration) ;
  • Park, Hyang-Mi (National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Jang-Yong (National Institute of Crop Science, Rural Development Administration) ;
  • Kang, Hong-Gyu (Subtropical Horticulture Research Institute, Cheju National University) ;
  • Yoon, Ho-Sung (Department of Biology, Kyungpook National University)
  • Received : 2008.11.10
  • Accepted : 2008.11.14
  • Published : 2008.12.31


Maintaining redox balance is one of the crucial requirements for a cell to endure stress from the outside. Dehydroascorbate reductase (DHAR; EC plays an important role in the ascorbate-glutathione cycle; one of the major ROS scavenging systems in most known biological systems. A cDNA clone of the DHAR gene from Oryza sativa (OsDHAR) was isolated and overexpressed in Escherichia coli BL21 (DE3) strain from the pET-28a(+) expression vector. The OsDHAR transformed E. coli cells showed significantly higher DHAR activity and a lower level of ROS than the E. coli cells transformed by an empty pET-28a(+) vector. Also, the DHAR-overexpressing E. coli strain was more tolerant to oxidant- and heavy metal-mediated stress conditions than the control E. coli strain. The results suggest that the overexpressed rice DHAR gene effectively functions in a prokaryotic system and provide protection to various oxidative stresses.


antioxidant;DHAR;Oryza sativa;oxidative stress;ROS


Supported by : Rural Development Administration


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