Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Isolation and Characterization of a Theta Glutathione S-transferase Gene from Panax ginseng Meyer

  • Kim, Yu-Jin (Department of Oriental Medicinal Materials and Processing, College of Life Science, Kyung Hee University) ;
  • Lee, Ok-Ran (Department of Oriental Medicinal Materials and Processing, College of Life Science, Kyung Hee University) ;
  • Lee, Sung-Young (Department of Computer Engineering, Kyung Hee University) ;
  • Kim, Kyung-Tack (Processing Technology Research Group, Korea Food Research Institute) ;
  • Yang, Deok-Chun (Department of Oriental Medicinal Materials and Processing, College of Life Science, Kyung Hee University)
  • Received : 2012.06.10
  • Accepted : 2012.08.11
  • Published : 2012.10.15
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Abstract

Plants have versatile detoxification systems to encounter the phytotoxicity of the wide range of natural and synthetic compounds present in the environment. Glutathione S-transferase (GST) is an enzyme that detoxifies natural and exogenous toxic compounds by conjugation with glutathione (GSH). Recently, several roles of GST giving stress tolerance in plants have demonstrated, but little is known about the role of ginseng GSTs. Therefore, this work aimed to provide further information on the GST gene present in Panax ginseng genome as well as its expression and function. A GST cDNA (PgGST) was isolated from P. ginseng cDNA library, and it showed the amino acid sequence similarity with theta type of GSTs. PgGST in ginseng plant was induced by exposure to metals, plant hormone, heavy metals, and high light irradiance. To improve the resistance against environmental stresses, full-length cDNA of PgGST was introduced into Nicotiana tabacum. Overexpression of PgGST led to twofold increase in GST-specific activity compared to the non-transgenic plants, and the GST overexpressed plant showed resistance against herbicide phosphinothricin. The results suggested that the PgGST isolated from ginseng might have a role in the protection mechanism against toxic materials such as heavy metals and herbicides.

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References

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